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NetBSD/usr.bin/mail/fio.c

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/* $NetBSD: fio.c,v 1.28 2006/11/28 18:45:32 christos Exp $ */
/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)fio.c 8.2 (Berkeley) 4/20/95";
#else
__RCSID("$NetBSD: fio.c,v 1.28 2006/11/28 18:45:32 christos Exp $");
#endif
#endif /* not lint */
#include "rcv.h"
#include "extern.h"
#include "thread.h"
/*
* Mail -- a mail program
*
* File I/O.
*/
#ifndef THREAD_SUPPORT
/************************************************************************/
/*
* If we have threading support, these routines live in thread.c.
*/
static struct message *message; /* message structure array */
static int msgCount; /* Count of messages read in */
PUBLIC struct message *
next_message(struct message *mp)
{
if (mp + 1 < message || mp + 1 >= message + msgCount)
return NULL;
return mp + 1;
}
PUBLIC struct message *
prev_message(struct message *mp)
{
if (mp - 1 < message || mp - 1 >= message + msgCount)
return NULL;
return mp - 1;
}
PUBLIC struct message *
get_message(int msgnum)
{
if (msgnum < 1 || msgnum > msgCount)
return NULL;
return message + msgnum - 1;
}
PUBLIC int
get_msgnum(struct message *mp)
{
if (mp < message || mp >= message + msgCount)
return 0;
return mp - message + 1;
}
PUBLIC int
get_msgCount(void)
{
return msgCount;
}
#endif /* THREAD_SUPPORT */
/************************************************************************/
/*
* Initialize a message structure.
*/
static void
message_init(struct message *mp, off_t offset, short flags)
{
/* use memset so new fields are always zeroed */
(void)memset(mp, 0, sizeof(*mp));
mp->m_flag = flags;
mp->m_block = blockof(offset);
mp->m_offset = offsetof(offset);
}
/*
* Take the data out of the passed ghost file and toss it into
* a dynamically allocated message structure.
*/
static void
makemessage(FILE *f, int omsgCount, int nmsgCount)
{
size_t size;
struct message *omessage; /* old message structure array */
struct message *nmessage;
omessage = get_abs_message(1);
size = (nmsgCount + 1) * sizeof(*nmessage);
nmessage = realloc(omessage, size);
if (nmessage == NULL)
err(1, "Insufficient memory for %d messages", nmsgCount);
if (omsgCount == 0 || omessage == NULL)
dot = nmessage;
else
dot = nmessage + (dot - omessage);
thread_fix_old_links(nmessage, omessage, omsgCount);
#ifndef THREAD_SUPPORT
message = nmessage;
#endif
size -= (omsgCount + 1) * sizeof(*nmessage);
(void)fflush(f);
(void)lseek(fileno(f), (off_t)sizeof(*nmessage), SEEK_SET);
if (read(fileno(f), &nmessage[omsgCount], size) != (ssize_t)size)
errx(EXIT_FAILURE, "Message temporary file corrupted");
message_init(&nmessage[nmsgCount], (off_t)0, 0); /* append a dummy */
thread_fix_new_links(nmessage, omsgCount, nmsgCount);
(void)Fclose(f);
}
/*
* Append the passed message descriptor onto the temp file.
* If the write fails, return 1, else 0
*/
static int
append(struct message *mp, FILE *f)
{
return fwrite(mp, sizeof *mp, 1, f) != 1;
}
/*
* Set up the input pointers while copying the mail file into /tmp.
*/
PUBLIC void
setptr(FILE *ibuf, off_t offset)
{
int c;
size_t len;
char *cp;
const char *cp2;
struct message this;
FILE *mestmp;
int maybe, inhead;
char linebuf[LINESIZE];
int omsgCount;
#ifdef THREAD_SUPPORT
int nmsgCount;
#else
# define nmsgCount msgCount
#endif
/* Get temporary file. */
(void)snprintf(linebuf, LINESIZE, "%s/mail.XXXXXX", tmpdir);
if ((c = mkstemp(linebuf)) == -1 ||
(mestmp = Fdopen(c, "r+")) == NULL) {
(void)fprintf(stderr, "mail: can't open %s\n", linebuf);
exit(1);
}
(void)unlink(linebuf);
nmsgCount = get_abs_msgCount();
if (offset == 0) {
nmsgCount = 0;
} else {
/* Seek into the file to get to the new messages */
(void)fseeko(ibuf, offset, 0);
/*
* We need to make "offset" a pointer to the end of
* the temp file that has the copy of the mail file.
* If any messages have been edited, this will be
* different from the offset into the mail file.
*/
(void)fseek(otf, 0L, SEEK_END);
offset = ftell(otf);
}
omsgCount = nmsgCount;
maybe = 1;
inhead = 0;
message_init(&this, (off_t)0, MUSED|MNEW);
for (;;) {
if (fgets(linebuf, LINESIZE, ibuf) == NULL) {
if (append(&this, mestmp)) {
warn("temporary file");
exit(1);
}
makemessage(mestmp, omsgCount, nmsgCount);
return;
}
len = strlen(linebuf);
/*
* Transforms lines ending in <CR><LF> to just <LF>.
* This allows mail to be able to read Eudora mailboxes
* that reside on a DOS partition.
*/
if (len >= 2 && linebuf[len-1] == '\n' &&
linebuf[len-2] == '\r') {
linebuf[len-2] = '\n';
len--;
}
(void)fwrite(linebuf, sizeof *linebuf, len, otf);
if (ferror(otf)) {
warn("/tmp");
exit(1);
}
if(len)
linebuf[len - 1] = 0;
if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
nmsgCount++;
if (append(&this, mestmp)) {
warn("temporary file");
exit(1);
}
message_init(&this, offset, MUSED|MNEW);
inhead = 1;
} else if (linebuf[0] == 0) {
inhead = 0;
} else if (inhead) {
for (cp = linebuf, cp2 = "status";; cp++) {
if ((c = *cp2++) == 0) {
while (isspace((unsigned char)*cp++))
continue;
if (cp[-1] != ':')
break;
while ((c = *cp++) != '\0')
if (c == 'R')
this.m_flag |= MREAD;
else if (c == 'O')
this.m_flag &= ~MNEW;
inhead = 0;
break;
}
if (*cp != c && *cp != toupper(c))
break;
}
}
offset += len;
this.m_size += len;
this.m_lines++;
if (!inhead) {
int lines_plus_wraps = 1;
size_t linelen = strlen(linebuf);
if (screenwidth && (int)linelen > screenwidth) {
lines_plus_wraps = linelen / screenwidth;
if (linelen % screenwidth != 0)
++lines_plus_wraps;
}
this.m_blines += lines_plus_wraps;
}
maybe = linebuf[0] == 0;
}
}
/*
* Drop the passed line onto the passed output buffer.
* If a write error occurs, return -1, else the count of
* characters written, including the newline if requested.
*/
PUBLIC int
putline(FILE *obuf, const char *linebuf, int outlf)
{
size_t c;
c = strlen(linebuf);
(void)fwrite(linebuf, sizeof *linebuf, c, obuf);
if (outlf) {
(void)putc('\n', obuf);
c++;
}
if (ferror(obuf))
return -1;
return c;
}
/*
* Read up a line from the specified input into the line
* buffer. Return the number of characters read. Do not
* include the newline at the end.
*/
PUBLIC int
mail_readline(FILE *ibuf, char *linebuf, int linesize)
{
int n;
clearerr(ibuf);
if (fgets(linebuf, linesize, ibuf) == NULL)
return -1;
n = strlen(linebuf);
if (n > 0 && linebuf[n - 1] == '\n')
linebuf[--n] = '\0';
return n;
}
/*
* Return a file buffer all ready to read up the
* passed message pointer.
*/
PUBLIC FILE *
setinput(const struct message *mp)
{
(void)fflush(otf);
if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), SEEK_SET) < 0)
err(1, "fseek");
return itf;
}
/*
* Delete a file, but only if the file is a plain file.
*/
PUBLIC int
rm(char *name)
{
struct stat sb;
if (stat(name, &sb) < 0)
return -1;
if (!S_ISREG(sb.st_mode)) {
errno = EISDIR;
return -1;
}
return unlink(name);
}
static int sigdepth; /* depth of holdsigs() */
static sigset_t nset, oset;
/*
* Hold signals SIGHUP, SIGINT, and SIGQUIT.
*/
PUBLIC void
holdsigs(void)
{
if (sigdepth++ == 0) {
(void)sigemptyset(&nset);
(void)sigaddset(&nset, SIGHUP);
(void)sigaddset(&nset, SIGINT);
(void)sigaddset(&nset, SIGQUIT);
(void)sigprocmask(SIG_BLOCK, &nset, &oset);
}
}
/*
* Release signals SIGHUP, SIGINT, and SIGQUIT.
*/
PUBLIC void
relsesigs(void)
{
if (--sigdepth == 0)
(void)sigprocmask(SIG_SETMASK, &oset, NULL);
}
/*
* Determine the size of the file possessed by
* the passed buffer.
*/
PUBLIC off_t
fsize(FILE *iob)
{
struct stat sbuf;
if (fstat(fileno(iob), &sbuf) < 0)
return 0;
return sbuf.st_size;
}
/*
* Determine the current folder directory name.
*/
PUBLIC int
getfold(char *name, size_t namesize)
{
char *folder;
if ((folder = value(ENAME_FOLDER)) == NULL)
return -1;
if (*folder == '/')
(void)strlcpy(name, folder, namesize);
else
(void)snprintf(name, namesize, "%s/%s", homedir, folder);
return 0;
}
/*
* Evaluate the string given as a new mailbox name.
* Supported meta characters:
* % for my system mail box
* %user for user's system mail box
* # for previous file
* & invoker's mbox file
* +file file in folder directory
* any shell meta character
* Return the file name as a dynamic string.
*/
PUBLIC const char *
expand(const char *name)
{
char xname[PATHSIZE];
char cmdbuf[PATHSIZE]; /* also used for file names */
int pid, l;
char *cp;
const char *shellcmd;
int pivec[2];
struct stat sbuf;
/*
* The order of evaluation is "%" and "#" expand into constants.
* "&" can expand into "+". "+" can expand into shell meta characters.
* Shell meta characters expand into constants.
* This way, we make no recursive expansion.
*/
switch (*name) {
case '%':
findmail(name[1] ? name + 1 : myname, xname, sizeof(xname));
return savestr(xname);
case '#':
if (name[1] != 0)
break;
if (prevfile[0] == 0) {
(void)printf("No previous file\n");
return NULL;
}
return savestr(prevfile);
case '&':
if (name[1] == 0 && (name = value(ENAME_MBOX)) == NULL)
name = "~/mbox";
/* fall through */
}
if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) {
(void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1);
name = savestr(xname);
}
/* catch the most common shell meta character */
if (name[0] == '~' && (name[1] == '/' || name[1] == '\0')) {
(void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1);
name = savestr(xname);
}
if (strpbrk(name, "~{[*?$`'\"\\") == NULL)
return name;
if (pipe(pivec) < 0) {
warn("pipe");
return name;
}
(void)snprintf(cmdbuf, sizeof(cmdbuf), "echo %s", name);
if ((shellcmd = value(ENAME_SHELL)) == NULL)
shellcmd = _PATH_CSHELL;
pid = start_command(shellcmd, 0, -1, pivec[1], "-c", cmdbuf, NULL);
if (pid < 0) {
(void)close(pivec[0]);
(void)close(pivec[1]);
return NULL;
}
(void)close(pivec[1]);
l = read(pivec[0], xname, sizeof(xname));
(void)close(pivec[0]);
if (wait_child(pid) < 0 && WTERMSIG(wait_status) != SIGPIPE) {
(void)fprintf(stderr, "\"%s\": Expansion failed.\n", name);
return NULL;
}
if (l < 0) {
warn("read");
return NULL;
}
if (l == 0) {
(void)fprintf(stderr, "\"%s\": No match.\n", name);
return NULL;
}
if (l == sizeof(xname)) {
(void)fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
return NULL;
}
xname[l] = '\0';
for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
continue;
cp[1] = '\0';
if (strchr(xname, ' ') && stat(xname, &sbuf) < 0) {
(void)fprintf(stderr, "\"%s\": Ambiguous.\n", name);
return NULL;
}
return savestr(xname);
}
/*
* Return the name of the dead.letter file.
*/
PUBLIC const char *
getdeadletter(void)
{
const char *cp;
if ((cp = value(ENAME_DEAD)) == NULL || (cp = expand(cp)) == NULL)
cp = expand("~/dead.letter");
else if (*cp != '/') {
char buf[PATHSIZE];
(void)snprintf(buf, sizeof(buf), "~/%s", cp);
cp = expand(buf);
}
return cp;
}
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