mirrors/nano
1
0
Fork 0
mirror of git://git.sv.gnu.org/nano.git synced 2024-11-29 16:13:27 +03:00
Code Issues Packages Projects Releases Wiki Activity
b66e4bfa5b
nano/src/files.c
Benno Schulenberg 4ede3b494f Truncating an overlong hostname properly instead of bailing out 
when writing a lock file.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5391 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
2015-11-06 20:14:37 +00:00

3260 lines
93 KiB
C
Raw Blame History

/* $Id$ */
/**************************************************************************
* files.c *
* *
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, *
* 2008, 2009, 2010, 2011, 2013, 2014 Free Software Foundation, Inc. *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3, or (at your option) *
* any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA *
* 02110-1301, USA. *
* *
**************************************************************************/
#include "proto.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <pwd.h>
#include <libgen.h>
/* Add an entry to the openfile openfilestruct. This should only be
* called from open_buffer(). */
void make_new_buffer(void)
{
/* If there are no entries in openfile, make the first one and
* move to it. */
if (openfile == NULL) {
openfile = make_new_opennode();
splice_opennode(openfile, openfile, openfile);
/* Otherwise, make a new entry for openfile, splice it in after
* the current entry, and move to it. */
} else {
splice_opennode(openfile, make_new_opennode(), openfile->next);
openfile = openfile->next;
/* More than one file open, show Close in help lines. */
exitfunc->desc = close_tag;
}
/* Start initializing the new buffer. */
openfile->filename = mallocstrcpy(NULL, "");
initialize_buffer_text();
openfile->current_x = 0;
openfile->placewewant = 0;
openfile->current_y = 0;
openfile->modified = FALSE;
#ifndef NANO_TINY
openfile->mark_set = FALSE;
openfile->mark_begin = NULL;
openfile->mark_begin_x = 0;
openfile->fmt = NIX_FILE;
openfile->undotop = NULL;
openfile->current_undo = NULL;
openfile->last_action = OTHER;
openfile->current_stat = NULL;
openfile->lock_filename = NULL;
#endif
#ifndef DISABLE_COLOR
openfile->syntax = NULL;
openfile->colorstrings = NULL;
#endif
}
/* Initialize the text of the current entry of the openfile
* openfilestruct. */
void initialize_buffer_text(void)
{
assert(openfile != NULL);
openfile->fileage = make_new_node(NULL);
openfile->fileage->data = mallocstrcpy(NULL, "");
openfile->filebot = openfile->fileage;
openfile->edittop = openfile->fileage;
openfile->current = openfile->fileage;
#ifndef DISABLE_COLOR
openfile->fileage->multidata = NULL;
#endif
openfile->totsize = 0;
}
#ifndef NANO_TINY
/* Actually write the lockfile. This function will ALWAYS annihilate
* any previous version of the file. We'll borrow INSECURE_BACKUP here
* to decide about lockfile paranoia here as well...
*
* Args:
* lockfilename: file name for lock
* origfilename: name of the file the lock is for
* modified: whether to set the modified bit in the file
*
* Returns: 1 on success, 0 on failure (but continue loading), -1 on
* failure and abort. */
int write_lockfile(const char *lockfilename, const char *origfilename, bool modified)
{
int cflags, fd;
FILE *filestream;
pid_t mypid;
uid_t myuid;
struct passwd *mypwuid;
struct stat fileinfo;
char *lockdata = charalloc(1024);
char myhostname[32];
ssize_t lockdatalen = 1024;
ssize_t wroteamt;
/* Run things which might fail first before we try and blow away the
* old state. */
myuid = geteuid();
if ((mypwuid = getpwuid(myuid)) == NULL) {
statusbar(_("Couldn't determine my identity for lock file (getpwuid() failed)"));
goto free_and_fail;
}
mypid = getpid();
if (gethostname(myhostname, 31) < 0) {
if (errno == ENAMETOOLONG)
myhostname[31] = '\0';
else {
statusbar(_("Couldn't determine hostname for lock file: %s"), strerror(errno));
goto free_and_fail;
}
}
/* Check if the lock exists before we try to delete it...*/
if (stat(lockfilename, &fileinfo) != -1)
if (delete_lockfile(lockfilename) < 0)
goto free_and_fail;
if (ISSET(INSECURE_BACKUP))
cflags = O_WRONLY | O_CREAT | O_APPEND;
else
cflags = O_WRONLY | O_CREAT | O_EXCL | O_APPEND;
fd = open(lockfilename, cflags,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
/* Maybe we just don't have write access. Print an error message
* and continue. */
if (fd < 0) {
statusbar(_("Error writing lock file %s: %s"), lockfilename,
strerror(errno));
free(lockdata);
return 0;
}
/* Now we've got a safe file stream. If the previous open() call
* failed, this will return NULL. */
filestream = fdopen(fd, "wb");
if (fd < 0 || filestream == NULL) {
statusbar(_("Error writing lock file %s: %s"), lockfilename,
strerror(errno));
goto free_and_fail;
}
/* Okay, so at the moment we're following this state for how to
* store the lock data:
*
* byte 0 - 0x62
* byte 1 - 0x30
* bytes 2-12 - program name which created the lock
* bytes 24,25 - little endian store of creator program's PID
* (b24 = 256^0 column, b25 = 256^1 column)
* bytes 28-44 - username of who created the lock
* bytes 68-100 - hostname of where the lock was created
* bytes 108-876 - filename the lock is for
* byte 1007 - 0x55 if file is modified
*
* Looks like VIM also stores undo state in this file, so we're
* gonna have to figure out how to slap a 'OMG don't use recover on
* our lockfile' message in here...
*
* This is likely very wrong, so this is a WIP. */
memset(lockdata, 0, lockdatalen);
lockdata[0] = 0x62;
lockdata[1] = 0x30;
lockdata[24] = mypid % 256;
lockdata[25] = mypid / 256;
snprintf(&lockdata[2], 11, "nano %s", VERSION);
strncpy(&lockdata[28], mypwuid->pw_name, 16);
strncpy(&lockdata[68], myhostname, 31);
strncpy(&lockdata[108], origfilename, 768);
if (modified == TRUE)
lockdata[1007] = 0x55;
wroteamt = fwrite(lockdata, sizeof(char), lockdatalen, filestream);
if (wroteamt < lockdatalen) {
statusbar(_("Error writing lock file %s: %s"),
lockfilename, ferror(filestream));
goto free_and_fail;
}
#ifdef DEBUG
fprintf(stderr, "In write_lockfile(), write successful (wrote %lu bytes)\n", (unsigned long)wroteamt);
#endif
if (fclose(filestream) == EOF) {
statusbar(_("Error writing lock file %s: %s"),
lockfilename, strerror(errno));
goto free_and_fail;
}
openfile->lock_filename = (char *) lockfilename;
free(lockdata);
return 1;
free_and_fail:
free(lockdata);
return -1;
}
/* Less exciting, delete the lockfile. Return -1 if unsuccessful and
* complain on the statusbar, 1 otherwise. */
int delete_lockfile(const char *lockfilename)
{
if (unlink(lockfilename) < 0 && errno != ENOENT) {
statusbar(_("Error deleting lock file %s: %s"), lockfilename,
strerror(errno));
return -1;
}
return 1;
}
/* Deal with lockfiles. Return -1 on refusing to override the lockfile,
* and 1 on successfully creating it; 0 means we were not successful in
* creating the lockfile but we should continue to load the file and
* complain to the user. */
int do_lockfile(const char *filename)
{
char *lockdir = dirname((char *) mallocstrcpy(NULL, filename));
char *lockbase = basename((char *) mallocstrcpy(NULL, filename));
size_t locknamesize = strlen(filename) + strlen(locking_prefix)
+ strlen(locking_suffix) + 3;
char *lockfilename = charalloc(locknamesize);
char *lockfiledir = NULL;
static char lockprog[11], lockuser[17];
struct stat fileinfo;
int lockfd, lockpid;
snprintf(lockfilename, locknamesize, "%s/%s%s%s", lockdir,
locking_prefix, lockbase, locking_suffix);
#ifdef DEBUG
fprintf(stderr, "lock file name is %s\n", lockfilename);
#endif
if (stat(lockfilename, &fileinfo) != -1) {
ssize_t readtot = 0;
ssize_t readamt = 0;
char *lockbuf = charalloc(8192);
char *promptstr = charalloc(128);
int ans;
if ((lockfd = open(lockfilename, O_RDONLY)) < 0) {
statusbar(_("Error opening lock file %s: %s"),
lockfilename, strerror(errno));
return -1;
}
do {
readamt = read(lockfd, &lockbuf[readtot], BUFSIZ);
readtot += readamt;
} while (readtot < 8192 && readamt > 0);
if (readtot < 48) {
statusbar(_("Error reading lock file %s: Not enough data read"),
lockfilename);
return -1;
}
strncpy(lockprog, &lockbuf[2], 10);
lockpid = (unsigned char)lockbuf[25] * 256 + (unsigned char)lockbuf[24];
strncpy(lockuser, &lockbuf[28], 16);
#ifdef DEBUG
fprintf(stderr, "lockpid = %d\n", lockpid);
fprintf(stderr, "program name which created this lock file should be %s\n", lockprog);
fprintf(stderr, "user which created this lock file should be %s\n", lockuser);
#endif
/* TRANSLATORS: The second %s is the name of the user, the third that of the editor. */
sprintf(promptstr, _("File %s is being edited (by %s with %s, PID %d); continue?"),
filename, lockuser, lockprog, lockpid);
ans = do_yesno_prompt(FALSE, promptstr);
if (ans < 1) {
blank_statusbar();
return -1;
}
} else {
lockfiledir = mallocstrcpy(NULL, lockfilename);
lockfiledir = dirname(lockfiledir);
if (stat(lockfiledir, &fileinfo) == -1) {
statusbar(_("Error writing lock file: Directory \'%s\' doesn't exist"),
lockfiledir);
return 0;
}
}
return write_lockfile(lockfilename, filename, FALSE);
}
#endif /* !NANO_TINY */
/* If it's not "", filename is a file to open. We make a new buffer, if
* necessary, and then open and read the file, if applicable. */
void open_buffer(const char *filename, bool undoable)
{
bool quiet = FALSE;
bool new_buffer = (openfile == NULL
#ifndef DISABLE_MULTIBUFFER
|| ISSET(MULTIBUFFER)
#endif
);
/* Whether we load into this buffer or a new one. */
FILE *f;
int rc;
/* rc == -2 means that we have a new file. -1 means that the
* open() failed. 0 means that the open() succeeded. */
assert(filename != NULL);
#ifndef DISABLE_OPERATINGDIR
if (check_operating_dir(filename, FALSE)) {
statusbar(_("Can't insert file from outside of %s"),
operating_dir);
return;
}
#endif
/* When the specified filename is not empty, and the thing exists,
* verify that it is a normal file. */
if (strcmp(filename, "") != 0) {
struct stat fileinfo;
if (stat(filename, &fileinfo) == 0 && !S_ISREG(fileinfo.st_mode)) {
if (S_ISDIR(fileinfo.st_mode))
statusbar(_("\"%s\" is a directory"), filename);
else
statusbar(_("\"%s\" is not a normal file"), filename);
beep();
return;
}
}
/* If we're going to load into a new buffer, first create the new
* buffer and lock the corresponding file. */
if (new_buffer) {
make_new_buffer();
#ifndef NANO_TINY
if (ISSET(LOCKING) && filename[0] != '\0') {
int lockstatus = do_lockfile(filename);
if (lockstatus < 0) {
#ifndef DISABLE_MULTIBUFFER
if (openfile->next) {
close_buffer(TRUE);
return;
}
#endif
} else if (lockstatus == 0) {
quiet = TRUE;
}
}
#endif
}
/* If the filename isn't blank, and we are not in NOREAD_MODE,
* open the file. Otherwise, treat it as a new file. */
rc = (filename[0] != '\0' && !ISSET(NOREAD_MODE)) ?
open_file(filename, new_buffer, quiet, &f) : -2;
/* If we have a file, and we're loading into a new buffer, update
* the filename. */
if (rc != -1 && new_buffer)
openfile->filename = mallocstrcpy(openfile->filename, filename);
/* If we have a non-new file, read it in. Then, if the buffer has
* no stat, update the stat, if applicable. */
if (rc > 0) {
read_file(f, rc, filename, undoable, new_buffer);
#ifndef NANO_TINY
if (openfile->current_stat == NULL) {
openfile->current_stat =
(struct stat *)nmalloc(sizeof(struct stat));
stat(filename, openfile->current_stat);
}
#endif
}
/* If we have a file, and we're loading into a new buffer, move back
* to the beginning of the first line of the buffer. */
if (rc != -1 && new_buffer) {
openfile->current = openfile->fileage;
openfile->current_x = 0;
openfile->placewewant = 0;
}
#ifndef DISABLE_COLOR
/* If we're loading into a new buffer, update the colors to account
* for it, if applicable. */
if (new_buffer)
color_update();
#endif
}
#ifndef DISABLE_SPELLER
/* Blow away the text of the current buffer, and then open and read
* the specified file into its place. */
void replace_buffer(const char *filename)
{
FILE *f;
int descriptor;
assert(filename != NULL && filename[0] != '\0');
/* Open the file quietly. */
descriptor = open_file(filename, TRUE, FALSE, &f);
/* Reinitialize the text of the current buffer. */
free_filestruct(openfile->fileage);
initialize_buffer_text();
/* If opening the file succeeded, read it in. */
if (descriptor > 0)
read_file(f, descriptor, filename, FALSE, TRUE);
/* Put current at a place that is certain to exist. */
openfile->current = openfile->fileage;
}
#endif /* !DISABLE_SPELLER */
/* Update the screen to account for the current buffer. */
void display_buffer(void)
{
/* Update the titlebar, since the filename may have changed. */
titlebar(NULL);
#ifndef DISABLE_COLOR
/* Make sure we're using the buffer's associated colors, if
* applicable. */
color_init();
#endif
/* Update the edit window. */
edit_refresh();
}
#ifndef DISABLE_MULTIBUFFER
/* Switch to the next file buffer if next_buf is TRUE. Otherwise,
* switch to the previous file buffer. */
void switch_to_prevnext_buffer(bool next_buf, bool quiet)
{
assert(openfile != NULL);
/* If only one file buffer is open, indicate it on the statusbar and
* get out. */
if (openfile == openfile->next) {
if (quiet == FALSE)
statusbar(_("No more open file buffers"));
return;
}
/* Switch to the next or previous file buffer, depending on the
* value of next_buf. */
openfile = next_buf ? openfile->next : openfile->prev;
#ifdef DEBUG
fprintf(stderr, "filename is %s\n", openfile->filename);
#endif
/* Update the screen to account for the current buffer. */
display_buffer();
/* Indicate the switch on the statusbar. */
if (quiet == FALSE)
statusbar(_("Switched to %s"),
((openfile->filename[0] == '\0') ?
_("New Buffer") : openfile->filename));
#ifdef DEBUG
dump_filestruct(openfile->current);
#endif
display_main_list();
}
/* Switch to the previous entry in the openfile filebuffer. */
void switch_to_prev_buffer_void(void)
{
switch_to_prevnext_buffer(FALSE, FALSE);
}
/* Switch to the next entry in the openfile filebuffer. */
void switch_to_next_buffer_void(void)
{
switch_to_prevnext_buffer(TRUE, FALSE);
}
/* Delete an entry from the openfile filebuffer, and switch to the one
* after it. Return TRUE on success, or FALSE if there are no more open
* file buffers.
* quiet - should we print messages switching bufers
*/
bool close_buffer(bool quiet)
{
assert(openfile != NULL);
/* If only one file buffer is open, get out. */
if (openfile == openfile->next)
return FALSE;
#ifndef DISABLE_HISTORIES
update_poshistory(openfile->filename, openfile->current->lineno, xplustabs() + 1);
#endif
/* Switch to the next file buffer. */
switch_to_prevnext_buffer(TRUE, quiet);
/* Close the file buffer we had open before. */
unlink_opennode(openfile->prev);
/* If only one buffer is open now, show Exit in the help lines. */
if (openfile == openfile->next)
exitfunc->desc = exit_tag;
return TRUE;
}
#endif /* !DISABLE_MULTIBUFFER */
/* A bit of a copy and paste from open_file(), is_file_writable() just
* checks whether the file is appendable as a quick permissions check,
* and we tend to err on the side of permissiveness (reporting TRUE when
* it might be wrong) to not fluster users editing on odd filesystems by
* printing incorrect warnings. */
int is_file_writable(const char *filename)
{
struct stat fileinfo, fileinfo2;
int fd;
FILE *f;
char *full_filename;
bool ans = TRUE;
if (ISSET(VIEW_MODE))
return TRUE;
assert(filename != NULL);
/* Get the specified file's full path. */
full_filename = get_full_path(filename);
/* Okay, if we can't stat the absolute path due to some component's
* permissions, just try the relative one. */
if (full_filename == NULL ||
(stat(full_filename, &fileinfo) == -1 && stat(filename, &fileinfo2) != -1))
full_filename = mallocstrcpy(NULL, filename);
if ((fd = open(full_filename, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR |
S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)) == -1 ||
(f = fdopen(fd, "a")) == NULL)
ans = FALSE;
else
fclose(f);
close(fd);
free(full_filename);
return ans;
}
/* We make a new line of text from buf. buf is length buf_len. If
* first_line_ins is TRUE, then we put the new line at the top of the
* file. Otherwise, we assume prevnode is the last line of the file,
* and put our line after prevnode. */
filestruct *read_line(char *buf, filestruct *prevnode, bool
*first_line_ins, size_t buf_len)
{
filestruct *fileptr = (filestruct *)nmalloc(sizeof(filestruct));
/* Convert nulls to newlines. buf_len is the string's real length. */
unsunder(buf, buf_len);
assert(openfile->fileage != NULL && strlen(buf) == buf_len);
fileptr->data = mallocstrcpy(NULL, buf);
#ifndef NANO_TINY
/* If it's a DOS file ("\r\n"), and file conversion isn't disabled,
* strip the '\r' part from fileptr->data. */
if (!ISSET(NO_CONVERT) && buf_len > 0 && buf[buf_len - 1] == '\r')
fileptr->data[buf_len - 1] = '\0';
#endif
#ifndef DISABLE_COLOR
fileptr->multidata = NULL;
#endif
if (*first_line_ins) {
/* Special case: we're inserting into the first line. */
fileptr->prev = NULL;
fileptr->next = openfile->fileage;
openfile->fileage = fileptr;
fileptr->lineno = 1;
/* Make sure that our edit window stays on the first line. */
openfile->edittop = fileptr;
*first_line_ins = FALSE;
} else {
assert(prevnode != NULL);
prevnode->next = fileptr;
fileptr->prev = prevnode;
fileptr->next = NULL;
fileptr->lineno = prevnode->lineno + 1;
}
return fileptr;
}
/* Read an open file into the current buffer. f should be set to the
* open file, and filename should be set to the name of the file.
* undoable means do we want to create undo records to try and undo
* this. Will also attempt to check file writability if fd > 0 and
* checkwritable == TRUE. */
void read_file(FILE *f, int fd, const char *filename, bool undoable, bool checkwritable)
{
size_t num_lines = 0;
/* The number of lines in the file. */
size_t len = 0;
/* The length of the current line of the file. */
size_t i = 0;
/* The position in the current line of the file. */
size_t bufx = MAX_BUF_SIZE;
/* The size of each chunk of the file that we read. */
char input = '\0';
/* The current input character. */
char *buf;
/* The buffer where we store chunks of the file. */
filestruct *fileptr = openfile->current;
/* The current line of the file. */
bool first_line_ins = FALSE;
/* Whether we're inserting with the cursor on the first line. */
int input_int;
/* The current value we read from the file, whether an input
* character or EOF. */
bool writable = TRUE;
/* Is the file writable (if we care) */
#ifndef NANO_TINY
int format = 0;
/* 0 = *nix, 1 = DOS, 2 = Mac, 3 = both DOS and Mac. */
#endif
assert(openfile->fileage != NULL && openfile->current != NULL);
buf = charalloc(bufx);
buf[0] = '\0';
#ifndef NANO_TINY
if (undoable)
add_undo(INSERT);
#endif
if (openfile->current == openfile->fileage)
first_line_ins = TRUE;
else
fileptr = openfile->current->prev;
/* Read the entire file into the filestruct. */
while ((input_int = getc(f)) != EOF) {
input = (char)input_int;
/* If it's a *nix file ("\n") or a DOS file ("\r\n"), and file
* conversion isn't disabled, handle it! */
if (input == '\n') {
#ifndef NANO_TINY
/* If it's a DOS file or a DOS/Mac file ('\r' before '\n' on
* the first line if we think it's a *nix file, or on any
* line otherwise), and file conversion isn't disabled,
* handle it! */
if (!ISSET(NO_CONVERT) && (num_lines == 0 || format != 0) &&
i > 0 && buf[i - 1] == '\r') {
if (format == 0 || format == 2)
format++;
}
#endif
/* Read in the line properly. */
fileptr = read_line(buf, fileptr, &first_line_ins, len);
/* Reset the line length in preparation for the next line. */
len = 0;
num_lines++;
buf[0] = '\0';
i = 0;
#ifndef NANO_TINY
/* If it's a Mac file ('\r' without '\n' on the first line if we
* think it's a *nix file, or on any line otherwise), and file
* conversion isn't disabled, handle it! */
} else if (!ISSET(NO_CONVERT) && (num_lines == 0 ||
format != 0) && i > 0 && buf[i - 1] == '\r') {
/* If we currently think the file is a *nix file, set format
* to Mac. If we currently think the file is a DOS file,
* set format to both DOS and Mac. */
if (format == 0 || format == 1)
format += 2;
/* Read in the line properly. */
fileptr = read_line(buf, fileptr, &first_line_ins, len);
/* Reset the line length in preparation for the next line.
* Since we've already read in the next character, reset it
* to 1 instead of 0. */
len = 1;
num_lines++;
buf[0] = input;
buf[1] = '\0';
i = 1;
#endif
} else {
/* Calculate the total length of the line. It might have
* nulls in it, so we can't just use strlen() here. */
len++;
/* Now we allocate a bigger buffer MAX_BUF_SIZE characters
* at a time. If we allocate a lot of space for one line,
* we may indeed have to use a buffer this big later on, so
* we don't decrease it at all. We do free it at the end,
* though. */
if (i >= bufx - 1) {
bufx += MAX_BUF_SIZE;
buf = charealloc(buf, bufx);
}
buf[i] = input;
buf[i + 1] = '\0';
i++;
}
}
/* Perhaps this could use some better handling. */
if (ferror(f))
nperror(filename);
fclose(f);
if (fd > 0 && checkwritable) {
close(fd);
writable = is_file_writable(filename);
}
#ifndef NANO_TINY
/* If file conversion isn't disabled and the last character in this
* file is '\r', read it in properly as a Mac format line. */
if (len == 0 && !ISSET(NO_CONVERT) && input == '\r') {
len = 1;
buf[0] = input;
buf[1] = '\0';
}
#endif
/* Did we not get a newline and still have stuff to do? */
if (len > 0) {
#ifndef NANO_TINY
/* If file conversion isn't disabled and the last character in
* this file is '\r', set format to Mac if we currently think
* the file is a *nix file, or to both DOS and Mac if we
* currently think the file is a DOS file. */
if (!ISSET(NO_CONVERT) && buf[len - 1] == '\r' &&
(format == 0 || format == 1))
format += 2;
#endif
/* Read in the last line properly. */
fileptr = read_line(buf, fileptr, &first_line_ins, len);
num_lines++;
}
free(buf);
/* If we didn't get a file and we don't already have one, open a
* blank buffer. */
if (fileptr == NULL)
open_buffer("", FALSE);
/* Attach the file we got to the filestruct. If we got a file of
* zero bytes, don't do anything. */
if (num_lines > 0) {
/* If the file we got doesn't end in a newline, tack its last
* line onto the beginning of the line at current. */
if (len > 0) {
size_t current_len = strlen(openfile->current->data);
/* Adjust the current x-coordinate to compensate for the
* change in the current line. */
if (num_lines == 1)
openfile->current_x += len;
else
openfile->current_x = len;
/* Tack the text at fileptr onto the beginning of the text
* at current. */
openfile->current->data = charealloc(openfile->current->data,
len + current_len + 1);
charmove(openfile->current->data + len, openfile->current->data,
current_len + 1);
strncpy(openfile->current->data, fileptr->data, len);
/* Don't destroy fileage, edittop, or filebot! */
if (fileptr == openfile->fileage)
openfile->fileage = openfile->current;
if (fileptr == openfile->edittop)
openfile->edittop = openfile->current;
if (fileptr == openfile->filebot)
openfile->filebot = openfile->current;
/* Move fileptr back one line and blow away the old fileptr,
* since its text has been saved. */
fileptr = fileptr->prev;
if (fileptr != NULL)
free(fileptr->next);
}
/* Attach the line at current after the line at fileptr. */
if (fileptr != NULL) {
fileptr->next = openfile->current;
openfile->current->prev = fileptr;
}
/* Renumber, starting with the last line of the file we inserted. */
renumber(openfile->current);
}
openfile->totsize += get_totsize(openfile->fileage, openfile->filebot);
/* If the NO_NEWLINES flag isn't set, and text has been added to
* the magicline (i.e. a file that doesn't end in a newline has been
* inserted at the end of the current buffer), add a new magicline,
* and move the current line down to it. */
if (!ISSET(NO_NEWLINES) && openfile->filebot->data[0] != '\0') {
new_magicline();
openfile->current = openfile->filebot;
openfile->current_x = 0;
}
/* Set the current place we want to the end of the last line of the
* file we inserted. */
openfile->placewewant = xplustabs();
#ifndef NANO_TINY
if (undoable)
update_undo(INSERT);
if (format == 3) {
if (writable)
statusbar(
P_("Read %lu line (Converted from DOS and Mac format)",
"Read %lu lines (Converted from DOS and Mac format)",
(unsigned long)num_lines), (unsigned long)num_lines);
else
statusbar(
P_("Read %lu line (Converted from DOS and Mac format - Warning: No write permission)",
"Read %lu lines (Converted from DOS and Mac format - Warning: No write permission)",
(unsigned long)num_lines), (unsigned long)num_lines);
} else if (format == 2) {
openfile->fmt = MAC_FILE;
if (writable)
statusbar(P_("Read %lu line (Converted from Mac format)",
"Read %lu lines (Converted from Mac format)",
(unsigned long)num_lines), (unsigned long)num_lines);
else
statusbar(P_("Read %lu line (Converted from Mac format - Warning: No write permission)",
"Read %lu lines (Converted from Mac format - Warning: No write permission)",
(unsigned long)num_lines), (unsigned long)num_lines);
} else if (format == 1) {
openfile->fmt = DOS_FILE;
if (writable)
statusbar(P_("Read %lu line (Converted from DOS format)",
"Read %lu lines (Converted from DOS format)",
(unsigned long)num_lines), (unsigned long)num_lines);
else
statusbar(P_("Read %lu line (Converted from DOS format - Warning: No write permission)",
"Read %lu lines (Converted from DOS format - Warning: No write permission)",
(unsigned long)num_lines), (unsigned long)num_lines);
} else
#endif
if (writable)
statusbar(P_("Read %lu line", "Read %lu lines",
(unsigned long)num_lines), (unsigned long)num_lines);
else
statusbar(P_("Read %lu line (Warning: No write permission)",
"Read %lu lines (Warning: No write permission)",
(unsigned long)num_lines), (unsigned long)num_lines);
#ifndef NANO_TINY
if (ISSET(MAKE_IT_UNIX))
openfile->fmt = NIX_FILE;
#endif
}
/* Open the file (and decide if it exists). If newfie is TRUE, display
* "New File" if the file is missing. Otherwise, say "[filename] not
* found".
*
* Return -2 if we say "New File", -1 if the file isn't opened, and the
* fd opened otherwise. The file might still have an error while reading
* with a 0 return value. *f is set to the opened file. */
int open_file(const char *filename, bool newfie, bool quiet, FILE **f)
{
struct stat fileinfo, fileinfo2;
int fd;
char *full_filename;
assert(filename != NULL && f != NULL);
/* Get the specified file's full path. */
full_filename = get_full_path(filename);
/* Okay, if we can't stat the path due to a component's
* permissions, just try the relative one. */
if (full_filename == NULL || (stat(full_filename, &fileinfo) == -1 &&
stat(filename, &fileinfo2) != -1))
full_filename = mallocstrcpy(NULL, filename);
if (stat(full_filename, &fileinfo) == -1) {
/* Well, maybe we can open the file even if the OS says it's
* not there. */
if ((fd = open(filename, O_RDONLY)) != -1) {
if (!quiet)
statusbar(_("Reading File"));
free(full_filename);
return 0;
}
if (newfie) {
if (!quiet)
statusbar(_("New File"));
return -2;
}
statusbar(_("\"%s\" not found"), filename);
beep();
return -1;
} else if (S_ISDIR(fileinfo.st_mode) || S_ISCHR(fileinfo.st_mode) ||
S_ISBLK(fileinfo.st_mode)) {
/* Don't open directories, character files, or block files.
* Sorry, /dev/sndstat! */
statusbar(S_ISDIR(fileinfo.st_mode) ?
_("\"%s\" is a directory") :
_("\"%s\" is a device file"), filename);
beep();
return -1;
} else if ((fd = open(full_filename, O_RDONLY)) == -1) {
statusbar(_("Error reading %s: %s"), filename, strerror(errno));
beep();
return -1;
} else {
/* The file is A-OK. Open it. */
*f = fdopen(fd, "rb");
if (*f == NULL) {
statusbar(_("Error reading %s: %s"), filename, strerror(errno));
beep();
close(fd);
} else
statusbar(_("Reading File"));
}
free(full_filename);
return fd;
}
/* This function will return the name of the first available extension
* of a filename (starting with [name][suffix], then [name][suffix].1,
* etc.). Memory is allocated for the return value. If no writable
* extension exists, we return "". */
char *get_next_filename(const char *name, const char *suffix)
{
unsigned long i = 0;
char *buf;
size_t wholenamelen;
assert(name != NULL && suffix != NULL);
wholenamelen = strlen(name) + strlen(suffix);
/* Reserve space for: the name plus the suffix plus a dot plus
* possibly five digits plus a null byte. */
buf = charalloc(wholenamelen + 7);
sprintf(buf, "%s%s", name, suffix);
while (TRUE) {
struct stat fs;
if (stat(buf, &fs) == -1)
return buf;
/* Limit the number of backup files to a hundred thousand. */
if (++i == 100000)
break;
sprintf(buf + wholenamelen, ".%lu", i);
}
/* We get here only if there is no possible save file. Blank out
* the filename to indicate this. */
null_at(&buf, 0);
return buf;
}
/* Insert a file into a new buffer if the MULTIBUFFER flag is set, or
* into the current buffer if it isn't. If execute is TRUE, insert the
* output of an executed command instead of a file. */
void do_insertfile(
#ifndef NANO_TINY
bool execute
#else
void
#endif
)
{
int i;
const char *msg;
char *ans = mallocstrcpy(NULL, "");
/* The last answer the user typed at the statusbar prompt. */
filestruct *edittop_save = openfile->edittop;
size_t current_x_save = openfile->current_x;
ssize_t current_y_save = openfile->current_y;
bool edittop_inside = FALSE;
#ifndef NANO_TINY
bool right_side_up = FALSE, single_line = FALSE;
#endif
while (TRUE) {
#ifndef NANO_TINY
if (execute) {
msg =
#ifndef DISABLE_MULTIBUFFER
ISSET(MULTIBUFFER) ?
_("Command to execute in new buffer [from %s] ") :
#endif
_("Command to execute [from %s] ");
} else
#endif /* NANO_TINY */
{
msg =
#ifndef DISABLE_MULTIBUFFER
ISSET(MULTIBUFFER) ?
_("File to insert into new buffer [from %s] ") :
#endif
_("File to insert [from %s] ");
}
i = do_prompt(TRUE,
#ifndef DISABLE_TABCOMP
TRUE,
#endif
#ifndef NANO_TINY
execute ? MEXTCMD :
#endif
MINSERTFILE, ans,
#ifndef DISABLE_HISTORIES
NULL,
#endif
edit_refresh, msg,
#ifndef DISABLE_OPERATINGDIR
operating_dir != NULL && strcmp(operating_dir,
".") != 0 ? operating_dir :
#endif
"./");
/* If we're in multibuffer mode and the filename or command is
* blank, open a new buffer instead of canceling. If the
* filename or command begins with a newline (i.e. an encoded
* null), treat it as though it's blank. */
if (i == -1 || ((i == -2 || *answer == '\n')
#ifndef DISABLE_MULTIBUFFER
&& !ISSET(MULTIBUFFER)
#endif
)) {
statusbar(_("Cancelled"));
break;
} else {
size_t pww_save = openfile->placewewant;
functionptrtype func = func_from_key(&i);
ans = mallocstrcpy(ans, answer);
#ifndef NANO_TINY
#ifndef DISABLE_MULTIBUFFER
if (func == new_buffer_void) {
/* Don't allow toggling if we're in view mode. */
if (!ISSET(VIEW_MODE))
TOGGLE(MULTIBUFFER);
else
beep();
continue;
}
#endif
if (func == flip_execute_void) {
execute = !execute;
continue;
}
#endif /* !NANO_TINY */
#ifndef DISABLE_BROWSER
if (func == to_files_void) {
char *tmp = do_browse_from(answer);
if (tmp == NULL)
continue;
/* We have a file now. Indicate this. */
free(answer);
answer = tmp;
i = 0;
}
#endif
/* If we don't have a file yet, go back to the statusbar prompt. */
if (i != 0
#ifndef DISABLE_MULTIBUFFER
&& (i != -2 || !ISSET(MULTIBUFFER))
#endif
)
continue;
#ifndef NANO_TINY
/* Keep track of whether the mark begins inside the
* partition and will need adjustment. */
if (openfile->mark_set) {
filestruct *top, *bot;
size_t top_x, bot_x;
mark_order((const filestruct **)&top, &top_x,
(const filestruct **)&bot, &bot_x,
&right_side_up);
single_line = (top == bot);
}
#endif
#ifndef DISABLE_MULTIBUFFER
if (!ISSET(MULTIBUFFER)) {
#endif
/* If we're not inserting into a new buffer, partition
* the filestruct so that it contains no text and hence
* looks like a new buffer, and keep track of whether
* the top of the edit window is inside the partition. */
filepart = partition_filestruct(openfile->current,
openfile->current_x, openfile->current,
openfile->current_x);
edittop_inside = (openfile->edittop == openfile->fileage);
#ifndef DISABLE_MULTIBUFFER
}
#endif
/* Convert newlines to nulls, just before we insert the file
* or execute the command. */
sunder(answer);
align(&answer);
#ifndef NANO_TINY
if (execute) {
#ifndef DISABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER))
/* Open a blank buffer. */
open_buffer("", FALSE);
#endif
/* Save the command's output in the current buffer. */
execute_command(answer);
#ifndef DISABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER)) {
/* Move back to the beginning of the first line of
* the buffer. */
openfile->current = openfile->fileage;
openfile->current_x = 0;
openfile->placewewant = 0;
}
#endif
} else
#endif /* !NANO_TINY */
{
/* Make sure the path to the file specified in answer is
* tilde-expanded. */
answer = mallocstrassn(answer, real_dir_from_tilde(answer));
/* Save the file specified in answer in the current buffer. */
open_buffer(answer, TRUE);
}
#if !defined(DISABLE_MULTIBUFFER) && !defined(DISABLE_HISTORIES)
if (ISSET(MULTIBUFFER)) {
/* Update the screen to account for the current buffer. */
display_buffer();
ssize_t savedposline, savedposcol;
if (ISSET(POS_HISTORY) &&
#ifndef NANO_TINY
!execute &&
#endif
check_poshistory(answer, &savedposline, &savedposcol))
do_gotolinecolumn(savedposline, savedposcol, FALSE, FALSE, FALSE, FALSE);
} else
#endif /* !DISABLE_MULTIBUFFER && !DISABLE_HISTORIES */
{
filestruct *top_save = openfile->fileage;
/* If we were at the top of the edit window before, set
* the saved value of edittop to the new top of the edit
* window. */
if (edittop_inside)
edittop_save = openfile->fileage;
/* Update the current x-coordinate to account for the
* number of characters inserted on the current line.
* If the mark begins inside the partition, adjust the
* mark coordinates to compensate for the change in the
* current line. */
openfile->current_x = strlen(openfile->filebot->data);
if (openfile->fileage == openfile->filebot) {
#ifndef NANO_TINY
if (openfile->mark_set) {
openfile->mark_begin = openfile->current;
if (!right_side_up)
openfile->mark_begin_x += openfile->current_x;
}
#endif
openfile->current_x += current_x_save;
}
#ifndef NANO_TINY
else if (openfile->mark_set) {
if (!right_side_up) {
if (single_line) {
openfile->mark_begin = openfile->current;
openfile->mark_begin_x -= current_x_save;
} else
openfile->mark_begin_x -= openfile->current_x;
}
}
#endif
/* Update the current y-coordinate to account for the
* number of lines inserted. */
openfile->current_y += current_y_save;
/* Unpartition the filestruct so that it contains all
* the text again. Note that we've replaced the
* non-text originally in the partition with the text in
* the inserted file/executed command output. */
unpartition_filestruct(&filepart);
/* Renumber starting with the beginning line of the old
* partition. */
renumber(top_save);
/* Restore the old edittop. */
openfile->edittop = edittop_save;
/* Restore the old place we want. */
openfile->placewewant = pww_save;
/* Mark the file as modified. */
set_modified();
/* Update the screen. */
edit_refresh();
}
break;
}
}
free(ans);
}
/* Insert a file into a new buffer or the current buffer, depending on
* whether the MULTIBUFFER flag is set. If we're in view mode, only
* allow inserting a file into a new buffer. */
void do_insertfile_void(void)
{
if (ISSET(RESTRICTED)) {
show_restricted_warning();
return;
}
#ifndef DISABLE_MULTIBUFFER
if (ISSET(VIEW_MODE) && !ISSET(MULTIBUFFER))
statusbar(_("Key invalid in non-multibuffer mode"));
else
#endif
do_insertfile(
#ifndef NANO_TINY
FALSE
#endif
);
display_main_list();
}
/* When passed "[relative path]" or "[relative path][filename]" in
* origpath, return "[full path]" or "[full path][filename]" on success,
* or NULL on error. Do this if the file doesn't exist but the relative
* path does, since the file could exist in memory but not yet on disk).
* Don't do this if the relative path doesn't exist, since we won't be
* able to go there. */
char *get_full_path(const char *origpath)
{
struct stat fileinfo;
char *d_here, *d_there, *d_there_file = NULL;
const char *last_slash;
bool path_only;
if (origpath == NULL)
return NULL;
/* Get the current directory. If it doesn't exist, back up and try
* again until we get a directory that does, and use that as the
* current directory. */
d_here = charalloc(PATH_MAX + 1);
d_here = getcwd(d_here, PATH_MAX + 1);
while (d_here == NULL) {
if (chdir("..") == -1)
break;
d_here = getcwd(d_here, PATH_MAX + 1);
}
/* If we succeeded, canonicalize it in d_here. */
if (d_here != NULL) {
align(&d_here);
/* If the current directory isn't "/", tack a slash onto the end
* of it. */
if (strcmp(d_here, "/") != 0) {
d_here = charealloc(d_here, strlen(d_here) + 2);
strcat(d_here, "/");
}
/* Otherwise, set d_here to "". */
} else
d_here = mallocstrcpy(NULL, "");
d_there = real_dir_from_tilde(origpath);
/* If stat()ing d_there fails, assume that d_there refers to a new
* file that hasn't been saved to disk yet. Set path_only to TRUE
* if d_there refers to a directory, and FALSE otherwise. */
path_only = (stat(d_there, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode));
/* If path_only is TRUE, make sure d_there ends in a slash. */
if (path_only) {
size_t d_there_len = strlen(d_there);
if (d_there[d_there_len - 1] != '/') {
d_there = charealloc(d_there, d_there_len + 2);
strcat(d_there, "/");
}
}
/* Search for the last slash in d_there. */
last_slash = strrchr(d_there, '/');
/* If we didn't find one, then make sure the answer is in the format
* "d_here/d_there". */
if (last_slash == NULL) {
assert(!path_only);
d_there_file = d_there;
d_there = d_here;
} else {
/* If path_only is FALSE, then save the filename portion of the
* answer (everything after the last slash) in d_there_file. */
if (!path_only)
d_there_file = mallocstrcpy(NULL, last_slash + 1);
/* Remove the filename portion of the answer from d_there. */
null_at(&d_there, last_slash - d_there + 1);
/* Go to the path specified in d_there. */
if (chdir(d_there) == -1) {
free(d_there);
d_there = NULL;
} else {
free(d_there);
/* Get the full path. */
d_there = charalloc(PATH_MAX + 1);
d_there = getcwd(d_there, PATH_MAX + 1);
/* If we succeeded, canonicalize it in d_there. */
if (d_there != NULL) {
align(&d_there);
/* If the current directory isn't "/", tack a slash onto
* the end of it. */
if (strcmp(d_there, "/") != 0) {
d_there = charealloc(d_there, strlen(d_there) + 2);
strcat(d_there, "/");
}
} else
/* Otherwise, set path_only to TRUE, so that we clean up
* correctly, free all allocated memory, and return
* NULL. */
path_only = TRUE;
/* Finally, go back to the path specified in d_here,
* where we were before. We don't check for a chdir()
* error, since we can do nothing if we get one. */
IGNORE_CALL_RESULT(chdir(d_here));
/* Free d_here, since we're done using it. */
free(d_here);
}
}
/* At this point, if path_only is FALSE and d_there isn't NULL,
* d_there contains the path portion of the answer and d_there_file
* contains the filename portion of the answer. If this is the
* case, tack the latter onto the end of the former. d_there will
* then contain the complete answer. */
if (!path_only && d_there != NULL) {
d_there = charealloc(d_there, strlen(d_there) +
strlen(d_there_file) + 1);
strcat(d_there, d_there_file);
}
/* Free d_there_file, since we're done using it. */
free(d_there_file);
return d_there;
}
/* Return the full version of path, as returned by get_full_path(). On
* error, or if path doesn't reference a directory, or if the directory
* isn't writable, return NULL. */
char *check_writable_directory(const char *path)
{
char *full_path = get_full_path(path);
/* If get_full_path() fails, return NULL. */
if (full_path == NULL)
return NULL;
/* If we can't write to path or path isn't a directory, return NULL. */
if (access(full_path, W_OK) != 0 ||
full_path[strlen(full_path) - 1] != '/') {
free(full_path);
return NULL;
}
/* Otherwise, return the full path. */
return full_path;
}
/* This function calls mkstemp(($TMPDIR|P_tmpdir|/tmp/)"nano.XXXXXX").
* On success, it returns the malloc()ed filename and corresponding FILE
* stream, opened in "r+b" mode. On error, it returns NULL for the
* filename and leaves the FILE stream unchanged. */
char *safe_tempfile(FILE **f)
{
char *full_tempdir = NULL;
const char *tmpdir_env;
int fd;
mode_t original_umask = 0;
assert(f != NULL);
/* If $TMPDIR is set, set tempdir to it, run it through
* get_full_path(), and save the result in full_tempdir. Otherwise,
* leave full_tempdir set to NULL. */
tmpdir_env = getenv("TMPDIR");
if (tmpdir_env != NULL)
full_tempdir = check_writable_directory(tmpdir_env);
/* If $TMPDIR is unset, empty, or not a writable directory, and
* full_tempdir is NULL, try P_tmpdir instead. */
if (full_tempdir == NULL)
full_tempdir = check_writable_directory(P_tmpdir);
/* if P_tmpdir is NULL, use /tmp. */
if (full_tempdir == NULL)
full_tempdir = mallocstrcpy(NULL, "/tmp/");
full_tempdir = charealloc(full_tempdir, strlen(full_tempdir) + 12);
strcat(full_tempdir, "nano.XXXXXX");
original_umask = umask(0);
umask(S_IRWXG | S_IRWXO);
fd = mkstemp(full_tempdir);
if (fd != -1)
*f = fdopen(fd, "r+b");
else {
free(full_tempdir);
full_tempdir = NULL;
}
umask(original_umask);
return full_tempdir;
}
#ifndef DISABLE_OPERATINGDIR
/* Initialize full_operating_dir based on operating_dir. */
void init_operating_dir(void)
{
assert(full_operating_dir == NULL);
if (operating_dir == NULL)
return;
full_operating_dir = get_full_path(operating_dir);
/* If get_full_path() failed or the operating directory is
* inaccessible, unset operating_dir. */
if (full_operating_dir == NULL || chdir(full_operating_dir) == -1) {
free(full_operating_dir);
full_operating_dir = NULL;
free(operating_dir);
operating_dir = NULL;
}
}
/* Check to see if we're inside the operating directory. Return FALSE
* if we are, or TRUE otherwise. If allow_tabcomp is TRUE, allow
* incomplete names that would be matches for the operating directory,
* so that tab completion will work. */
bool check_operating_dir(const char *currpath, bool allow_tabcomp)
{
/* full_operating_dir is global for memory cleanup. It should have
* already been initialized by init_operating_dir(). Also, a
* relative operating directory path will only be handled properly
* if this is done. */
char *fullpath;
bool retval = FALSE;
const char *whereami1, *whereami2 = NULL;
/* If no operating directory is set, don't bother doing anything. */
if (operating_dir == NULL)
return FALSE;
assert(full_operating_dir != NULL);
fullpath = get_full_path(currpath);
/* If fullpath is NULL, it means some directory in the path doesn't
* exist or is unreadable. If allow_tabcomp is FALSE, then currpath
* is what the user typed somewhere. We don't want to report a
* non-existent directory as being outside the operating directory,
* so we return FALSE. If allow_tabcomp is TRUE, then currpath
* exists, but is not executable. So we say it isn't in the
* operating directory. */
if (fullpath == NULL)
return allow_tabcomp;
whereami1 = strstr(fullpath, full_operating_dir);
if (allow_tabcomp)
whereami2 = strstr(full_operating_dir, fullpath);
/* If both searches failed, we're outside the operating directory.
* Otherwise, check the search results. If the full operating
* directory path is not at the beginning of the full current path
* (for normal usage) and vice versa (for tab completion, if we're
* allowing it), we're outside the operating directory. */
if (whereami1 != fullpath && whereami2 != full_operating_dir)
retval = TRUE;
free(fullpath);
/* Otherwise, we're still inside it. */
return retval;
}
#endif
#ifndef NANO_TINY
/* Although this sucks, it sucks less than having a single 'my system is
* messed up and I'm blanket allowing insecure file writing operations'. */
int prompt_failed_backupwrite(const char *filename)
{
static int i;
static char *prevfile = NULL; /* What was the last file we were
* passed so we don't keep asking
* this? Though maybe we should... */
if (prevfile == NULL || strcmp(filename, prevfile)) {
i = do_yesno_prompt(FALSE,
_("Failed to write backup file, continue saving? (Say N if unsure) "));
prevfile = mallocstrcpy(prevfile, filename);
}
return i;
}
void init_backup_dir(void)
{
char *full_backup_dir;
if (backup_dir == NULL)
return;
full_backup_dir = get_full_path(backup_dir);
/* If get_full_path() failed or the backup directory is
* inaccessible, unset backup_dir. */
if (full_backup_dir == NULL ||
full_backup_dir[strlen(full_backup_dir) - 1] != '/') {
free(full_backup_dir);
free(backup_dir);
backup_dir = NULL;
} else {
free(backup_dir);
backup_dir = full_backup_dir;
}
}
#endif /* !NANO_TINY */
/* Read from inn, write to out. We assume inn is opened for reading,
* and out for writing. We return 0 on success, -1 on read error, or -2
* on write error. */
int copy_file(FILE *inn, FILE *out)
{
int retval = 0;
char buf[BUFSIZ];
size_t charsread;
assert(inn != NULL && out != NULL && inn != out);
do {
charsread = fread(buf, sizeof(char), BUFSIZ, inn);
if (charsread == 0 && ferror(inn)) {
retval = -1;
break;
}
if (fwrite(buf, sizeof(char), charsread, out) < charsread) {
retval = -2;
break;
}
} while (charsread > 0);
if (fclose(inn) == EOF)
retval = -1;
if (fclose(out) == EOF)
retval = -2;
return retval;
}
/* Write a file out to disk. If f_open isn't NULL, we assume that it is
* a stream associated with the file, and we don't try to open it
* ourselves. If tmp is TRUE, we set the umask to disallow anyone else
* from accessing the file, we don't set the filename to its name, and
* we don't print out how many lines we wrote on the statusbar.
*
* tmp means we are writing a temporary file in a secure fashion. We
* use it when spell checking or dumping the file on an error. If
* append is APPEND, it means we are appending instead of overwriting.
* If append is PREPEND, it means we are prepending instead of
* overwriting. If nonamechange is TRUE, we don't change the current
* filename. nonamechange is ignored if tmp is FALSE, we're appending,
* or we're prepending.
*
* Return TRUE on success or FALSE on error. */
bool write_file(const char *name, FILE *f_open, bool tmp, append_type
append, bool nonamechange)
{
bool retval = FALSE;
/* Instead of returning in this function, you should always
* set retval and then goto cleanup_and_exit. */
size_t lineswritten = 0;
const filestruct *fileptr = openfile->fileage;
int fd;
/* The file descriptor we use. */
mode_t original_umask = 0;
/* Our umask, from when nano started. */
#ifndef NANO_TINY
bool realexists;
/* The result of stat(). TRUE if the file exists, FALSE
* otherwise. If name is a link that points nowhere, realexists
* is FALSE. */
struct stat st;
/* The status fields filled in by stat(). */
#endif
bool anyexists;
/* The result of lstat(). The same as realexists, unless name
* is a link. */
struct stat lst;
/* The status fields filled in by lstat(). */
char *realname;
/* name after tilde expansion. */
FILE *f = NULL;
/* The actual file, realname, we are writing to. */
char *tempname = NULL;
/* The name of the temporary file we write to on prepend. */
assert(name != NULL);
if (*name == '\0')
return -1;
if (f_open != NULL)
f = f_open;
if (!tmp)
titlebar(NULL);
realname = real_dir_from_tilde(name);
#ifndef DISABLE_OPERATINGDIR
/* If we're writing a temporary file, we're probably going outside
* the operating directory, so skip the operating directory test. */
if (!tmp && check_operating_dir(realname, FALSE)) {
statusbar(_("Can't write outside of %s"), operating_dir);
goto cleanup_and_exit;
}
#endif
anyexists = (lstat(realname, &lst) != -1);
/* If the temp file exists and isn't already open, give up. */
if (tmp && anyexists && f_open == NULL)
goto cleanup_and_exit;
/* If NOFOLLOW_SYMLINKS is set, it doesn't make sense to prepend or
* append to a symlink. Here we warn about the contradiction. */
if (ISSET(NOFOLLOW_SYMLINKS) && anyexists && S_ISLNK(lst.st_mode)) {
statusbar(
_("Cannot prepend or append to a symlink with --nofollow set"));
goto cleanup_and_exit;
}
#ifndef NANO_TINY
/* Check whether the file (at the end of the symlink) exists. */
realexists = (stat(realname, &st) != -1);
/* If we haven't stat()d this file before (say, the user just
* specified it interactively), stat and save the value now,
* or else we will chase null pointers when we do modtime checks,
* preserve file times, and so on, during backup. */
if (openfile->current_stat == NULL && !tmp && realexists) {
openfile->current_stat = (struct stat *)nmalloc(sizeof(struct stat));
stat(realname, openfile->current_stat);
}
/* We backup only if the backup toggle is set, the file isn't
* temporary, and the file already exists. Furthermore, if we
* aren't appending, prepending, or writing a selection, we backup
* only if the file has not been modified by someone else since nano
* opened it. */
if (ISSET(BACKUP_FILE) && !tmp && realexists && ((append != OVERWRITE ||
openfile->mark_set) || (openfile->current_stat &&
openfile->current_stat->st_mtime == st.st_mtime))) {
int backup_fd;
FILE *backup_file;
char *backupname;
struct utimbuf filetime;
int copy_status;
int backup_cflags;
/* Save the original file's access and modification times. */
filetime.actime = openfile->current_stat->st_atime;
filetime.modtime = openfile->current_stat->st_mtime;
if (f_open == NULL) {
/* Open the original file to copy to the backup. */
f = fopen(realname, "rb");
if (f == NULL) {
statusbar(_("Error reading %s: %s"), realname,
strerror(errno));
beep();
/* If we can't read from the original file, go on, since
* only saving the original file is better than saving
* nothing. */
goto skip_backup;
}
}
/* If backup_dir is set, we set backupname to
* backup_dir/backupname~[.number], where backupname is the
* canonicalized absolute pathname of realname with every '/'
* replaced with a '!'. This means that /home/foo/file is
* backed up in backup_dir/!home!foo!file~[.number]. */
if (backup_dir != NULL) {
char *backuptemp = get_full_path(realname);
if (backuptemp == NULL)
/* If get_full_path() failed, we don't have a
* canonicalized absolute pathname, so just use the
* filename portion of the pathname. We use tail() so
* that e.g. ../backupname will be backed up in
* backupdir/backupname~ instead of
* backupdir/../backupname~. */
backuptemp = mallocstrcpy(NULL, tail(realname));
else {
size_t i = 0;
for (; backuptemp[i] != '\0'; i++) {
if (backuptemp[i] == '/')
backuptemp[i] = '!';
}
}
backupname = charalloc(strlen(backup_dir) +
strlen(backuptemp) + 1);
sprintf(backupname, "%s%s", backup_dir, backuptemp);
free(backuptemp);
backuptemp = get_next_filename(backupname, "~");
if (*backuptemp == '\0') {
statusbar(_("Error writing backup file %s: %s"), backupname,
_("Too many backup files?"));
free(backuptemp);
free(backupname);
/* If we can't write to the backup, DON'T go on, since
* whatever caused the backup file to fail (e.g. disk
* full may well cause the real file write to fail,
* which means we could lose both the backup and the
* original! */
goto cleanup_and_exit;
} else {
free(backupname);
backupname = backuptemp;
}
} else {
backupname = charalloc(strlen(realname) + 2);
sprintf(backupname, "%s~", realname);
}
/* First, unlink any existing backups. Next, open the backup
* file with O_CREAT and O_EXCL. If it succeeds, we have a file
* descriptor to a new backup file. */
if (unlink(backupname) < 0 && errno != ENOENT && !ISSET(INSECURE_BACKUP)) {
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusbar(_("Error writing backup file %s: %s"), backupname,
strerror(errno));
free(backupname);
goto cleanup_and_exit;
}
if (ISSET(INSECURE_BACKUP))
backup_cflags = O_WRONLY | O_CREAT | O_APPEND;
else
backup_cflags = O_WRONLY | O_CREAT | O_EXCL | O_APPEND;
backup_fd = open(backupname, backup_cflags,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
/* Now we've got a safe file stream. If the previous open()
* call failed, this will return NULL. */
backup_file = fdopen(backup_fd, "wb");
if (backup_fd < 0 || backup_file == NULL) {
statusbar(_("Error writing backup file %s: %s"), backupname,
strerror(errno));
free(backupname);
goto cleanup_and_exit;
}
/* We shouldn't worry about chown()ing something if we're not
* root, since it's likely to fail! */
if (geteuid() == NANO_ROOT_UID && fchown(backup_fd,
openfile->current_stat->st_uid, openfile->current_stat->st_gid) == -1
&& !ISSET(INSECURE_BACKUP)) {
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusbar(_("Error writing backup file %s: %s"), backupname,
strerror(errno));
free(backupname);
fclose(backup_file);
goto cleanup_and_exit;
}
if (fchmod(backup_fd, openfile->current_stat->st_mode) == -1
&& !ISSET(INSECURE_BACKUP)) {
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusbar(_("Error writing backup file %s: %s"), backupname,
strerror(errno));
free(backupname);
fclose(backup_file);
/* If we can't write to the backup, DONT go on, since
* whatever caused the backup file to fail (e.g. disk
* full) may well cause the real file write to fail, which
* means we could lose both the backup and the original! */
goto cleanup_and_exit;
}
#ifdef DEBUG
fprintf(stderr, "Backing up %s to %s\n", realname, backupname);
#endif
/* Copy the file. */
copy_status = copy_file(f, backup_file);
if (copy_status != 0) {
statusbar(_("Error reading %s: %s"), realname,
strerror(errno));
beep();
goto cleanup_and_exit;
}
/* And set its metadata. */
if (utime(backupname, &filetime) == -1 && !ISSET(INSECURE_BACKUP)) {
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusbar(_("Error writing backup file %s: %s"), backupname,
strerror(errno));
/* If we can't write to the backup, DON'T go on, since
* whatever caused the backup file to fail (e.g. disk full
* may well cause the real file write to fail, which means
* we could lose both the backup and the original! */
goto cleanup_and_exit;
}
free(backupname);
}
skip_backup:
#endif /* !NANO_TINY */
/* If NOFOLLOW_SYMLINKS is set and the file is a link, we aren't
* doing prepend or append. So we delete the link first, and just
* overwrite. */
if (ISSET(NOFOLLOW_SYMLINKS) && anyexists && S_ISLNK(lst.st_mode) &&
unlink(realname) == -1) {
statusbar(_("Error writing %s: %s"), realname, strerror(errno));
goto cleanup_and_exit;
}
if (f_open == NULL) {
original_umask = umask(0);
/* If we create a temp file, we don't let anyone else access it.
* We create a temp file if tmp is TRUE. */
if (tmp)
umask(S_IRWXG | S_IRWXO);
else
umask(original_umask);
}
/* If we're prepending, copy the file to a temp file. */
if (append == PREPEND) {
int fd_source;
FILE *f_source = NULL;
if (f == NULL) {
f = fopen(realname, "rb");
if (f == NULL) {
statusbar(_("Error reading %s: %s"), realname,
strerror(errno));
beep();
goto cleanup_and_exit;
}
}
tempname = safe_tempfile(&f);
if (tempname == NULL) {
statusbar(_("Error writing temp file: %s"),
strerror(errno));
goto cleanup_and_exit;
}
if (f_open == NULL) {
fd_source = open(realname, O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd_source != -1) {
f_source = fdopen(fd_source, "rb");
if (f_source == NULL) {
statusbar(_("Error reading %s: %s"), realname,
strerror(errno));
beep();
close(fd_source);
fclose(f);
unlink(tempname);
goto cleanup_and_exit;
}
}
}
if (f_source == NULL || copy_file(f_source, f) != 0) {
statusbar(_("Error writing %s: %s"), tempname,
strerror(errno));
unlink(tempname);
goto cleanup_and_exit;
}
}
if (f_open == NULL) {
/* Now open the file in place. Use O_EXCL if tmp is TRUE. This
* is copied from joe, because wiggy says so *shrug*. */
fd = open(realname, O_WRONLY | O_CREAT | ((append == APPEND) ?
O_APPEND : (tmp ? O_EXCL : O_TRUNC)), S_IRUSR |
S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
/* Set the umask back to the user's original value. */
umask(original_umask);
/* If we couldn't open the file, give up. */
if (fd == -1) {
statusbar(_("Error writing %s: %s"), realname,
strerror(errno));
/* tempname has been set only if we're prepending. */
if (tempname != NULL)
unlink(tempname);
goto cleanup_and_exit;
}
f = fdopen(fd, (append == APPEND) ? "ab" : "wb");
if (f == NULL) {
statusbar(_("Error writing %s: %s"), realname,
strerror(errno));
close(fd);
goto cleanup_and_exit;
}
}
/* There might not be a magicline. There won't be when writing out
* a selection. */
assert(openfile->fileage != NULL && openfile->filebot != NULL);
while (fileptr != NULL) {
size_t data_len = strlen(fileptr->data), size;
/* Convert newlines to nulls, just before we write to disk. */
sunder(fileptr->data);
size = fwrite(fileptr->data, sizeof(char), data_len, f);
/* Convert nulls to newlines. data_len is the string's real
* length. */
unsunder(fileptr->data, data_len);
if (size < data_len) {
statusbar(_("Error writing %s: %s"), realname,
strerror(errno));
fclose(f);
goto cleanup_and_exit;
}
/* If we're on the last line of the file, don't write a newline
* character after it. If the last line of the file is blank,
* this means that zero bytes are written, in which case we
* don't count the last line in the total lines written. */
if (fileptr == openfile->filebot) {
if (fileptr->data[0] == '\0')
lineswritten--;
} else {
#ifndef NANO_TINY
if (openfile->fmt == DOS_FILE || openfile->fmt == MAC_FILE) {
if (putc('\r', f) == EOF) {
statusbar(_("Error writing %s: %s"), realname,
strerror(errno));
fclose(f);
goto cleanup_and_exit;
}
}
if (openfile->fmt != MAC_FILE)
#endif
if (putc('\n', f) == EOF) {
statusbar(_("Error writing %s: %s"), realname,
strerror(errno));
fclose(f);
goto cleanup_and_exit;
}
}
fileptr = fileptr->next;
lineswritten++;
}
/* If we're prepending, open the temp file, and append it to f. */
if (append == PREPEND) {
int fd_source;
FILE *f_source = NULL;
fd_source = open(tempname, O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd_source != -1) {
f_source = fdopen(fd_source, "rb");
if (f_source == NULL)
close(fd_source);
}
if (f_source == NULL) {
statusbar(_("Error reading %s: %s"), tempname,
strerror(errno));
beep();
fclose(f);
goto cleanup_and_exit;
}
if (copy_file(f_source, f) == -1) {
statusbar(_("Error writing %s: %s"), realname,
strerror(errno));
goto cleanup_and_exit;
}
unlink(tempname);
} else if (fclose(f) != 0) {
statusbar(_("Error writing %s: %s"), realname,
strerror(errno));
goto cleanup_and_exit;
}
if (!tmp && append == OVERWRITE) {
if (!nonamechange) {
openfile->filename = mallocstrcpy(openfile->filename,
realname);
#ifndef DISABLE_COLOR
/* We might have changed the filename, so update the colors
* to account for it, and then make sure we're using
* them. */
color_update();
color_init();
/* If color syntaxes are available and turned on, we need to
* call edit_refresh(). */
if (openfile->colorstrings != NULL && !ISSET(NO_COLOR_SYNTAX))
edit_refresh();
#endif
}
#ifndef NANO_TINY
/* Update current_stat to reference the file as it is now. */
if (openfile->current_stat == NULL)
openfile->current_stat =
(struct stat *)nmalloc(sizeof(struct stat));
if (!openfile->mark_set)
stat(realname, openfile->current_stat);
#endif
statusbar(P_("Wrote %lu line", "Wrote %lu lines",
(unsigned long)lineswritten),
(unsigned long)lineswritten);
openfile->modified = FALSE;
titlebar(NULL);
}
retval = TRUE;
cleanup_and_exit:
free(realname);
free(tempname);
return retval;
}
#ifndef NANO_TINY
/* Write a marked selection from a file out to disk. Return TRUE on
* success or FALSE on error. */
bool write_marked_file(const char *name, FILE *f_open, bool tmp,
append_type append)
{
bool retval;
bool old_modified = openfile->modified;
/* write_file() unsets the modified flag. */
bool added_magicline = FALSE;
/* Whether we added a magicline after filebot. */
filestruct *top, *bot;
size_t top_x, bot_x;
assert(openfile->mark_set);
/* Partition the filestruct so that it contains only the marked
* text. */
mark_order((const filestruct **)&top, &top_x,
(const filestruct **)&bot, &bot_x, NULL);
filepart = partition_filestruct(top, top_x, bot, bot_x);
/* Handle the magicline if the NO_NEWLINES flag isn't set. If the
* line at filebot is blank, treat it as the magicline and hence the
* end of the file. Otherwise, add a magicline and treat it as the
* end of the file. */
if (!ISSET(NO_NEWLINES) &&
(added_magicline = (openfile->filebot->data[0] != '\0')))
new_magicline();
retval = write_file(name, f_open, tmp, append, TRUE);
/* If the NO_NEWLINES flag isn't set, and we added a magicline,
* remove it now. */
if (!ISSET(NO_NEWLINES) && added_magicline)
remove_magicline();
/* Unpartition the filestruct so that it contains all the text
* again. */
unpartition_filestruct(&filepart);
if (old_modified)
set_modified();
return retval;
}
#endif /* !NANO_TINY */
/* Write the current file to disk. If the mark is on, write the current
* marked selection to disk. If exiting is TRUE, write the file to disk
* regardless of whether the mark is on, and without prompting if the
* TEMP_FILE flag is set and the current file has a name. Return TRUE
* on success or FALSE on error. */
bool do_writeout(bool exiting)
{
int i;
append_type append = OVERWRITE;
char *ans;
/* The last answer the user typed at the statusbar prompt. */
#ifndef DISABLE_EXTRA
static bool did_credits = FALSE;
#endif
bool retval = FALSE;
if (openfile->filename[0] != '\0' && ISSET(TEMP_FILE)) {
retval = write_file(openfile->filename, NULL, FALSE, OVERWRITE,
FALSE);
/* Write succeeded. */
if (retval)
return retval;
}
ans = mallocstrcpy(NULL,
#ifndef NANO_TINY
(!exiting && openfile->mark_set) ? "" :
#endif
openfile->filename);
while (TRUE) {
const char *msg;
#ifndef NANO_TINY
const char *formatstr, *backupstr;
formatstr = (openfile->fmt == DOS_FILE) ? _(" [DOS Format]") :
(openfile->fmt == MAC_FILE) ? _(" [Mac Format]") : "";
backupstr = ISSET(BACKUP_FILE) ? _(" [Backup]") : "";
/* If we're using restricted mode, don't display the "Write
* Selection to File" prompt. This function is disabled, since
* it allows reading from or writing to files not specified on
* the command line. */
if (!ISSET(RESTRICTED) && !exiting && openfile->mark_set)
msg = (append == PREPEND) ? _("Prepend Selection to File") :
(append == APPEND) ? _("Append Selection to File") :
_("Write Selection to File");
else
#endif /* !NANO_TINY */
msg = (append == PREPEND) ? _("File Name to Prepend to") :
(append == APPEND) ? _("File Name to Append to") :
_("File Name to Write");
/* If we're not exiting, and the TEMP_FILE flag is set, and
* the current file doesn't have a name, warn the user before
* prompting for a name. If we are exiting, we've already
* warned the user just before the "Save modified buffer"
* prompt, so we don't need to do it again. */
if (!exiting && openfile->filename[0] == '\0' && ISSET(TEMP_FILE))
no_current_file_name_warning();
/* If we're using restricted mode, the filename isn't blank,
* and we're at the "Write File" prompt, disable tab
* completion. */
i = do_prompt(!ISSET(RESTRICTED) ||
openfile->filename[0] == '\0',
#ifndef DISABLE_TABCOMP
TRUE,
#endif
MWRITEFILE, ans,
#ifndef DISABLE_HISTORIES
NULL,
#endif
edit_refresh, "%s%s%s", msg,
#ifndef NANO_TINY
formatstr, backupstr
#else
"", ""
#endif
);
/* If the filename or command begins with a newline (i.e. an
* encoded null), treat it as though it's blank. */
if (i < 0 || *answer == '\n') {
statusbar(_("Cancelled"));
retval = FALSE;
break;
} else {
functionptrtype func = func_from_key(&i);
ans = mallocstrcpy(ans, answer);
#ifndef DISABLE_BROWSER
if (func == to_files_void) {
char *tmp = do_browse_from(answer);
if (tmp == NULL)
continue;
/* We have a file now. Indicate this. */
free(answer);
answer = tmp;
} else
#endif /* !DISABLE_BROWSER */
#ifndef NANO_TINY
if (func == dos_format_void) {
openfile->fmt = (openfile->fmt == DOS_FILE) ? NIX_FILE :
DOS_FILE;
continue;
} else if (func == mac_format_void) {
openfile->fmt = (openfile->fmt == MAC_FILE) ? NIX_FILE :
MAC_FILE;
continue;
} else if (func == backup_file_void) {
TOGGLE(BACKUP_FILE);
continue;
} else
#endif /* !NANO_TINY */
if (func == prepend_void) {
append = (append == PREPEND) ? OVERWRITE : PREPEND;
continue;
} else if (func == append_void) {
append = (append == APPEND) ? OVERWRITE : APPEND;
continue;
} else if (func == do_help_void) {
continue;
}
#ifdef DEBUG
fprintf(stderr, "filename is %s\n", answer);
#endif
#ifndef DISABLE_EXTRA
/* If the current file has been modified, we've pressed
* Ctrl-X at the edit window to exit, we've pressed "y" at
* the "Save modified buffer" prompt to save, we've entered
* "zzy" as the filename to save under (hence "xyzzy"), and
* this is the first time we've done this, show an Easter
* egg. Display the credits. */
if (!did_credits && exiting && !ISSET(TEMP_FILE) &&
strcasecmp(answer, "zzy") == 0) {
do_credits();
did_credits = TRUE;
retval = FALSE;
break;
}
#endif
if (append == OVERWRITE) {
size_t answer_len = strlen(answer);
bool name_exists, do_warning;
char *full_answer, *full_filename;
struct stat st;
/* Convert newlines to nulls, just before we get the
* full path. */
sunder(answer);
full_answer = get_full_path(answer);
full_filename = get_full_path(openfile->filename);
name_exists = (stat((full_answer == NULL) ? answer :
full_answer, &st) != -1);
if (openfile->filename[0] == '\0')
do_warning = name_exists;
else
do_warning = (strcmp((full_answer == NULL) ?
answer : full_answer, (full_filename == NULL) ?
openfile->filename : full_filename) != 0);
/* Convert nulls to newlines. answer_len is the
* string's real length. */
unsunder(answer, answer_len);
free(full_filename);
free(full_answer);
if (do_warning) {
/* If we're using restricted mode, we aren't allowed
* to overwrite an existing file with the current
* file. We also aren't allowed to change the name
* of the current file if it has one, because that
* would allow reading from or writing to files not
* specified on the command line. */
if (ISSET(RESTRICTED))
continue;
if (name_exists) {
i = do_yesno_prompt(FALSE,
_("File exists, OVERWRITE ? "));
if (i == 0 || i == -1)
continue;
} else
#ifndef NANO_TINY
if (exiting || !openfile->mark_set)
#endif
{
i = do_yesno_prompt(FALSE,
_("Save file under DIFFERENT NAME ? "));
if (i == 0 || i == -1)
continue;
}
}
#ifndef NANO_TINY
/* Complain if the file exists, the name hasn't changed,
* and the stat information we had before does not match
* what we have now. */
else if (name_exists && openfile->current_stat &&
(openfile->current_stat->st_mtime < st.st_mtime ||
openfile->current_stat->st_dev != st.st_dev ||
openfile->current_stat->st_ino != st.st_ino)) {
i = do_yesno_prompt(FALSE,
_("File was modified since you opened it, continue saving ? "));
if (i == 0 || i == -1)
continue;
}
#endif
}
/* Convert newlines to nulls, just before we save the file. */
sunder(answer);
align(&answer);
/* Here's where we allow the selected text to be written to
* a separate file. If we're using restricted mode, this
* function is disabled, since it allows reading from or
* writing to files not specified on the command line. */
retval =
#ifndef NANO_TINY
(!ISSET(RESTRICTED) && !exiting && openfile->mark_set) ?
write_marked_file(answer, NULL, FALSE, append) :
#endif
write_file(answer, NULL, FALSE, append, FALSE);
break;
}
}
free(ans);
return retval;
}
/* Write the current file to disk. If the mark is on, write the current
* marked selection to disk. */
void do_writeout_void(void)
{
do_writeout(FALSE);
display_main_list();
}
#ifndef NANO_TINY
/* If it has a name, write the current file to disk without prompting. */
void do_savefile(void)
{
if (openfile->filename[0] != '\0')
write_file(openfile->filename, NULL, FALSE, OVERWRITE, FALSE);
else
do_writeout_void();
}
#endif
/* Return a malloc()ed string containing the actual directory, used to
* convert ~user/ and ~/ notation. */
char *real_dir_from_tilde(const char *buf)
{
char *retval;
assert(buf != NULL);
if (*buf == '~') {
size_t i = 1;
char *tilde_dir;
/* Figure out how much of the string we need to compare. */
for (; buf[i] != '/' && buf[i] != '\0'; i++)
;
/* Get the home directory. */
if (i == 1) {
get_homedir();
tilde_dir = mallocstrcpy(NULL, homedir);
} else {
const struct passwd *userdata;
tilde_dir = mallocstrncpy(NULL, buf, i + 1);
tilde_dir[i] = '\0';
do {
userdata = getpwent();
} while (userdata != NULL && strcmp(userdata->pw_name,
tilde_dir + 1) != 0);
endpwent();
if (userdata != NULL)
tilde_dir = mallocstrcpy(tilde_dir, userdata->pw_dir);
}
retval = charalloc(strlen(tilde_dir) + strlen(buf + i) + 1);
sprintf(retval, "%s%s", tilde_dir, buf + i);
free(tilde_dir);
} else
retval = mallocstrcpy(NULL, buf);
return retval;
}
#if !defined(DISABLE_TABCOMP) || !defined(DISABLE_BROWSER)
/* Our sort routine for file listings. Sort alphabetically and
* case-insensitively, and sort directories before filenames. */
int diralphasort(const void *va, const void *vb)
{
struct stat fileinfo;
const char *a = *(const char *const *)va;
const char *b = *(const char *const *)vb;
bool aisdir = stat(a, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode);
bool bisdir = stat(b, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode);
if (aisdir && !bisdir)
return -1;
if (!aisdir && bisdir)
return 1;
/* Standard function brain damage: We should be sorting
* alphabetically and case-insensitively according to the current
* locale, but there's no standard strcasecoll() function, so we
* have to use multibyte strcasecmp() instead. */
return mbstrcasecmp(a, b);
}
/* Free the memory allocated for array, which should contain len
* elements. */
void free_chararray(char **array, size_t len)
{
assert(array != NULL);
for (; len > 0; len--)
free(array[len - 1]);
free(array);
}
#endif
#ifndef DISABLE_TABCOMP
/* Is the given path a directory? */
bool is_dir(const char *buf)
{
char *dirptr;
struct stat fileinfo;
bool retval;
assert(buf != NULL);
dirptr = real_dir_from_tilde(buf);
retval = (stat(dirptr, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode));
free(dirptr);
return retval;
}
/* These functions, username_tab_completion(), cwd_tab_completion()
* (originally exe_n_cwd_tab_completion()), and input_tab(), were
* adapted from busybox 0.46 (cmdedit.c). Here is the notice from that
* file, with the copyright years updated:
*
* Termios command line History and Editting, originally
* intended for NetBSD sh (ash)
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Majorly adjusted/re-written for busybox:
* Erik Andersen <andersee@debian.org>
*
* You may use this code as you wish, so long as the original author(s)
* are attributed in any redistributions of the source code.
* This code is 'as is' with no warranty.
* This code may safely be consumed by a BSD or GPL license. */
/* We consider the first buf_len characters of buf for ~username tab
* completion. */
char **username_tab_completion(const char *buf, size_t *num_matches,
size_t buf_len)
{
char **matches = NULL;
const struct passwd *userdata;
assert(buf != NULL && num_matches != NULL && buf_len > 0);
*num_matches = 0;
while ((userdata = getpwent()) != NULL) {
if (strncmp(userdata->pw_name, buf + 1, buf_len - 1) == 0) {
/* Cool, found a match. Add it to the list. This makes a
* lot more sense to me (Chris) this way... */
#ifndef DISABLE_OPERATINGDIR
/* ...unless the match exists outside the operating
* directory, in which case just go to the next match. */
if (check_operating_dir(userdata->pw_dir, TRUE))
continue;
#endif
matches = (char **)nrealloc(matches, (*num_matches + 1) *
sizeof(char *));
matches[*num_matches] =
charalloc(strlen(userdata->pw_name) + 2);
sprintf(matches[*num_matches], "~%s", userdata->pw_name);
++(*num_matches);
}
}
endpwent();
return matches;
}
/* We consider the first buf_len characters of buf for filename tab
* completion. */
char **cwd_tab_completion(const char *buf, bool allow_files, size_t
*num_matches, size_t buf_len)
{
char *dirname = mallocstrcpy(NULL, buf), *filename;
size_t filenamelen;
char **matches = NULL;
DIR *dir;
const struct dirent *nextdir;
assert(dirname != NULL && num_matches != NULL);
*num_matches = 0;
null_at(&dirname, buf_len);
/* Okie, if there's a / in the buffer, strip out the directory
* part. */
filename = strrchr(dirname, '/');
if (filename != NULL) {
char *tmpdirname = filename + 1;
filename = mallocstrcpy(NULL, tmpdirname);
*tmpdirname = '\0';
tmpdirname = dirname;
dirname = real_dir_from_tilde(dirname);
free(tmpdirname);
} else {
filename = dirname;
dirname = mallocstrcpy(NULL, "./");
}
assert(dirname[strlen(dirname) - 1] == '/');
dir = opendir(dirname);
if (dir == NULL) {
/* Don't print an error, just shut up and return. */
beep();
free(filename);
free(dirname);
return NULL;
}
filenamelen = strlen(filename);
while ((nextdir = readdir(dir)) != NULL) {
bool skip_match = FALSE;
#ifdef DEBUG
fprintf(stderr, "Comparing \'%s\'\n", nextdir->d_name);
#endif
/* See if this matches. */
if (strncmp(nextdir->d_name, filename, filenamelen) == 0 &&
(*filename == '.' || (strcmp(nextdir->d_name, ".") != 0 &&
strcmp(nextdir->d_name, "..") != 0))) {
/* Cool, found a match. Add it to the list. This makes a
* lot more sense to me (Chris) this way... */
char *tmp = charalloc(strlen(dirname) +
strlen(nextdir->d_name) + 1);
sprintf(tmp, "%s%s", dirname, nextdir->d_name);
#ifndef DISABLE_OPERATINGDIR
/* ...unless the match exists outside the operating
* directory, in which case just go to the next match. */
if (check_operating_dir(tmp, TRUE))
skip_match = TRUE;
#endif
/* ...or unless the match isn't a directory and allow_files
* isn't set, in which case just go to the next match. */
if (!allow_files && !is_dir(tmp))
skip_match = TRUE;
free(tmp);
if (skip_match)
continue;
matches = (char **)nrealloc(matches, (*num_matches + 1) *
sizeof(char *));
matches[*num_matches] = mallocstrcpy(NULL, nextdir->d_name);
++(*num_matches);
}
}
closedir(dir);
free(dirname);
free(filename);
return matches;
}
/* Do tab completion. place refers to how much the statusbar cursor
* position should be advanced. refresh_func is the function we will
* call to refresh the edit window. */
char *input_tab(char *buf, bool allow_files, size_t *place, bool
*lastwastab, void (*refresh_func)(void), bool *list)
{
size_t num_matches = 0, buf_len;
char **matches = NULL;
assert(buf != NULL && place != NULL && *place <= strlen(buf) &&
lastwastab != NULL && refresh_func != NULL && list != NULL);
*list = FALSE;
/* If the word starts with `~' and there is no slash in the word,
* then try completing this word as a username. */
if (*place > 0 && *buf == '~') {
const char *bob = strchr(buf, '/');
if (bob == NULL || bob >= buf + *place)
matches = username_tab_completion(buf, &num_matches,
*place);
}
/* Match against files relative to the current working directory. */
if (matches == NULL)
matches = cwd_tab_completion(buf, allow_files, &num_matches,
*place);
buf_len = strlen(buf);
if (num_matches == 0 || *place != buf_len)
beep();
else {
size_t match, common_len = 0;
char *mzero;
const char *lastslash = revstrstr(buf, "/", buf + *place);
size_t lastslash_len = (lastslash == NULL) ? 0 :
lastslash - buf + 1;
char *match1_mb = charalloc(mb_cur_max() + 1);
char *match2_mb = charalloc(mb_cur_max() + 1);
int match1_mb_len, match2_mb_len;
while (TRUE) {
for (match = 1; match < num_matches; match++) {
/* Get the number of single-byte characters that all the
* matches have in common. */
match1_mb_len = parse_mbchar(matches[0] + common_len,
match1_mb, NULL);
match2_mb_len = parse_mbchar(matches[match] +
common_len, match2_mb, NULL);
match1_mb[match1_mb_len] = '\0';
match2_mb[match2_mb_len] = '\0';
if (strcmp(match1_mb, match2_mb) != 0)
break;
}
if (match < num_matches || matches[0][common_len] == '\0')
break;
common_len += parse_mbchar(buf + common_len, NULL, NULL);
}
free(match1_mb);
free(match2_mb);
mzero = charalloc(lastslash_len + common_len + 1);
strncpy(mzero, buf, lastslash_len);
strncpy(mzero + lastslash_len, matches[0], common_len);
common_len += lastslash_len;
mzero[common_len] = '\0';
assert(common_len >= *place);
if (num_matches == 1 && is_dir(mzero)) {
mzero[common_len++] = '/';
assert(common_len > *place);
}
if (num_matches > 1 && (common_len != *place || !*lastwastab))
beep();
/* If there is more of a match to display on the statusbar, show
* it. We reset lastwastab to FALSE: it requires pressing Tab
* twice in succession with no statusbar changes to see a match
* list. */
if (common_len != *place) {
*lastwastab = FALSE;
buf = charealloc(buf, common_len + buf_len - *place + 1);
charmove(buf + common_len, buf + *place, buf_len -
*place + 1);
strncpy(buf, mzero, common_len);
*place = common_len;
} else if (!*lastwastab || num_matches < 2)
*lastwastab = TRUE;
else {
int longest_name = 0, ncols, editline = 0;
/* Now we show a list of the available choices. */
assert(num_matches > 1);
/* Sort the list. */
qsort(matches, num_matches, sizeof(char *), diralphasort);
for (match = 0; match < num_matches; match++) {
common_len = strnlenpt(matches[match], COLS - 1);
if (common_len > COLS - 1) {
longest_name = COLS - 1;
break;
}
if (common_len > longest_name)
longest_name = common_len;
}
assert(longest_name <= COLS - 1);
/* Each column will be (longest_name + 2) columns wide, i.e.
* two spaces between columns, except that there will be
* only one space after the last column. */
ncols = (COLS + 1) / (longest_name + 2);
/* Blank the edit window, and print the matches out
* there. */
blank_edit();
wmove(edit, 0, 0);
/* Disable el cursor. */
curs_set(0);
for (match = 0; match < num_matches; match++) {
char *disp;
wmove(edit, editline, (longest_name + 2) *
(match % ncols));
if (match % ncols == 0 &&
editline == editwinrows - 1 &&
num_matches - match > ncols) {
waddstr(edit, _("(more)"));
break;
}
disp = display_string(matches[match], 0, longest_name,
FALSE);
waddstr(edit, disp);
free(disp);
if ((match + 1) % ncols == 0)
editline++;
}
wnoutrefresh(edit);
*list = TRUE;
}
free(mzero);
}
free_chararray(matches, num_matches);
/* Only refresh the edit window if we don't have a list of filename
* matches on it. */
if (!*list)
refresh_func();
/* Enable el cursor. */
curs_set(1);
return buf;
}
#endif /* !DISABLE_TABCOMP */
/* Only print the last part of a path. Isn't there a shell command for
* this? */
const char *tail(const char *foo)
{
const char *tmp = strrchr(foo, '/');
if (tmp == NULL)
tmp = foo;
else
tmp++;
return tmp;
}
#ifndef DISABLE_HISTORIES
/* Return the constructed dirfile path, or NULL if we can't find the home
* directory. The string is dynamically allocated, and should be
* freed. */
char *construct_filename(const char *str)
{
char *newstr = NULL;
if (homedir != NULL) {
size_t homelen = strlen(homedir);
newstr = charalloc(homelen + strlen(str) + 1);
strcpy(newstr, homedir);
strcpy(newstr + homelen, str);
}
return newstr;
}
char *histfilename(void)
{
return construct_filename("/.nano/search_history");
}
/* Construct the legacy history filename.
* (Deprecate in 2.5, delete later.) */
char *legacyhistfilename(void)
{
return construct_filename("/.nano_history");
}
char *poshistfilename(void)
{
return construct_filename("/.nano/filepos_history");
}
void history_error(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
vfprintf(stderr, _(msg), ap);
va_end(ap);
fprintf(stderr, _("\nPress Enter to continue\n"));
while (getchar() != '\n')
;
}
/* Now that we have more than one history file, let's just rely on a
* .nano dir for this stuff. Return 1 if the dir exists or was
* successfully created, and return 0 otherwise. */
int check_dotnano(void)
{
int ret = 1;
struct stat dirstat;
char *nanodir = construct_filename("/.nano");
if (stat(nanodir, &dirstat) == -1) {
if (mkdir(nanodir, S_IRWXU | S_IRWXG | S_IRWXO) == -1) {
history_error(N_("Unable to create directory %s: %s\n"
"It is required for saving/loading search history or cursor positions.\n"),
nanodir, strerror(errno));
ret = 0;
}
} else if (!S_ISDIR(dirstat.st_mode)) {
history_error(N_("Path %s is not a directory and needs to be.\n"
"Nano will be unable to load or save search history or cursor positions.\n"),
nanodir);
ret = 0;
}
free(nanodir);
return ret;
}
/* Load the search and replace histories from ~/.nano/search_history. */
void load_history(void)
{
char *nanohist = histfilename();
char *legacyhist = legacyhistfilename();
struct stat hstat;
if (stat(legacyhist, &hstat) != -1 && stat(nanohist, &hstat) == -1) {
if (rename(legacyhist, nanohist) == -1)
history_error(N_("Detected a legacy nano history file (%s) which I tried to move\n"
"to the preferred location (%s) but encountered an error: %s"),
legacyhist, nanohist, strerror(errno));
else
history_error(N_("Detected a legacy nano history file (%s) which I moved\n"
"to the preferred location (%s)\n(see the nano FAQ about this change)"),
legacyhist, nanohist);
}
/* Assume do_rcfile() has reported a missing home directory. */
if (nanohist != NULL) {
FILE *hist = fopen(nanohist, "rb");
if (hist == NULL) {
if (errno != ENOENT) {
/* Don't save history when we quit. */
UNSET(HISTORYLOG);
history_error(N_("Error reading %s: %s"), nanohist,
strerror(errno));
}
} else {
/* Load a history list (first the search history, then the
* replace history) from the oldest entry to the newest.
* Assume the last history entry is a blank line. */
filestruct **history = &search_history;
char *line = NULL;
size_t buf_len = 0;
ssize_t read;
while ((read = getline(&line, &buf_len, hist)) >= 0) {
if (read > 0 && line[read - 1] == '\n') {
read--;
line[read] = '\0';
}
if (read > 0) {
unsunder(line, read);
update_history(history, line);
} else
history = &replace_history;
}
fclose(hist);
free(line);
}
free(nanohist);
free(legacyhist);
}
}
/* Write the lines of a history list, starting with the line at h, to
* the open file at hist. Return TRUE if the write succeeded, and FALSE
* otherwise. */
bool writehist(FILE *hist, filestruct *h)
{
filestruct *p;
/* Write a history list from the oldest entry to the newest. Assume
* the last history entry is a blank line. */
for (p = h; p != NULL; p = p->next) {
size_t p_len = strlen(p->data);
sunder(p->data);
if (fwrite(p->data, sizeof(char), p_len, hist) < p_len ||
putc('\n', hist) == EOF)
return FALSE;
}
return TRUE;
}
/* Save the search and replace histories to ~/.nano/search_history. */
void save_history(void)
{
char *nanohist;
/* Don't save unchanged or empty histories. */
if (!history_has_changed() || (searchbot->lineno == 1 &&
replacebot->lineno == 1))
return;
nanohist = histfilename();
if (nanohist != NULL) {
FILE *hist = fopen(nanohist, "wb");
if (hist == NULL)
history_error(N_("Error writing %s: %s"), nanohist,
strerror(errno));
else {
/* Make sure no one else can read from or write to the
* history file. */
chmod(nanohist, S_IRUSR | S_IWUSR);
if (!writehist(hist, searchage) || !writehist(hist, replaceage))
history_error(N_("Error writing %s: %s"), nanohist,
strerror(errno));
fclose(hist);
}
free(nanohist);
}
}
/* Save the recorded last file positions to ~/.nano/filepos_history. */
void save_poshistory(void)
{
char *poshist;
char *statusstr = NULL;
poshiststruct *posptr;
poshist = poshistfilename();
if (poshist != NULL) {
FILE *hist = fopen(poshist, "wb");
if (hist == NULL)
history_error(N_("Error writing %s: %s"), poshist,
strerror(errno));
else {
/* Make sure no one else can read from or write to the
* history file. */
chmod(poshist, S_IRUSR | S_IWUSR);
for (posptr = poshistory; posptr != NULL; posptr = posptr->next) {
statusstr = charalloc(strlen(posptr->filename) + 2 * sizeof(ssize_t) + 4);
sprintf(statusstr, "%s %ld %ld\n", posptr->filename, (long)posptr->lineno,
(long)posptr->xno);
if (fwrite(statusstr, sizeof(char), strlen(statusstr), hist) < strlen(statusstr))
history_error(N_("Error writing %s: %s"), poshist,
strerror(errno));
free(statusstr);
}
fclose(hist);
}
free(poshist);
}
}
/* Update the recorded last file positions, given a filename, a line
* and a column. If no entry is found, add a new one at the end. */
void update_poshistory(char *filename, ssize_t lineno, ssize_t xpos)
{
poshiststruct *posptr, *posprev = NULL;
char *fullpath = get_full_path(filename);
if (fullpath == NULL)
return;
for (posptr = poshistory; posptr != NULL; posptr = posptr->next) {
if (!strcmp(posptr->filename, fullpath)) {
posptr->lineno = lineno;
posptr->xno = xpos;
return;
}
posprev = posptr;
}
/* Didn't find it, make a new node yo! */
posptr = (poshiststruct *)nmalloc(sizeof(poshiststruct));
posptr->filename = mallocstrcpy(NULL, fullpath);
posptr->lineno = lineno;
posptr->xno = xpos;
posptr->next = NULL;
if (!poshistory)
poshistory = posptr;
else
posprev->next = posptr;
free(fullpath);
}
/* Check the recorded last file positions to see if the given file
* matches an existing entry. If so, return 1 and set line and column
* to the retrieved values. Otherwise, return 0. */
int check_poshistory(const char *file, ssize_t *line, ssize_t *column)
{
poshiststruct *posptr;
char *fullpath = get_full_path(file);
if (fullpath == NULL)
return 0;
for (posptr = poshistory; posptr != NULL; posptr = posptr->next) {
if (!strcmp(posptr->filename, fullpath)) {
*line = posptr->lineno;
*column = posptr->xno;
free(fullpath);
return 1;
}
}
free(fullpath);
return 0;
}
/* Load the recorded file positions from ~/.nano/filepos_history. */
void load_poshistory(void)
{
char *nanohist = poshistfilename();
/* Assume do_rcfile() has reported a missing home directory. */
if (nanohist != NULL) {
FILE *hist = fopen(nanohist, "rb");
if (hist == NULL) {
if (errno != ENOENT) {
/* Don't save history when we quit. */
UNSET(POS_HISTORY);
history_error(N_("Error reading %s: %s"), nanohist,
strerror(errno));
}
} else {
char *line = NULL, *lineptr, *xptr;
size_t buf_len = 0;
ssize_t read, lineno, xno;
poshiststruct *posptr;
/* Read and parse each line, and put the data into the
* positions history structure. */
while ((read = getline(&line, &buf_len, hist)) >= 0) {
if (read > 0 && line[read - 1] == '\n') {
read--;
line[read] = '\0';
}
if (read > 0)
unsunder(line, read);
lineptr = parse_next_word(line);
xptr = parse_next_word(lineptr);
lineno = atoi(lineptr);
xno = atoi(xptr);
if (poshistory == NULL) {
poshistory = (poshiststruct *)nmalloc(sizeof(poshiststruct));
poshistory->filename = mallocstrcpy(NULL, line);
poshistory->lineno = lineno;
poshistory->xno = xno;
poshistory->next = NULL;
} else {
for (posptr = poshistory; posptr->next != NULL; posptr = posptr->next)
;
posptr->next = (poshiststruct *)nmalloc(sizeof(poshiststruct));
posptr->next->filename = mallocstrcpy(NULL, line);
posptr->next->lineno = lineno;
posptr->next->xno = xno;
posptr->next->next = NULL;
}
}
fclose(hist);
free(line);
}
free(nanohist);
}
}
#endif /* !DISABLE_HISTORIES */
Reference in New Issue View Git Blame Copy Permalink