NetBSD/usr.bin/patch/inp.c

277 lines
7.0 KiB
C

/* $NetBSD: inp.c,v 1.17 2003/07/30 08:51:04 itojun Exp $ */
/*
* Copyright (c) 1988, Larry Wall
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following condition
* is met:
* 1. Redistributions of source code must retain the above copyright
* notice, this condition and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
__RCSID("$NetBSD: inp.c,v 1.17 2003/07/30 08:51:04 itojun Exp $");
#endif /* not lint */
#include "EXTERN.h"
#include "backupfile.h"
#include "common.h"
#include "util.h"
#include "pch.h"
#include "INTERN.h"
#include "inp.h"
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
static void plan_a(char *);
static bool rev_in_string(char *);
/* Input-file-with-indexable-lines abstract type. */
static size_t i_size; /* Size of the input file */
static char *i_womp; /* Plan a buffer for entire file */
static char **i_ptr; /* Pointers to lines in i_womp */
/*
* New patch -- prepare to edit another file.
*/
void
re_input(void)
{
i_size = 0;
if (i_ptr != NULL)
free(i_ptr);
if (i_womp != NULL)
free(i_womp);
i_womp = NULL;
i_ptr = NULL;
}
/*
* Construct the line index, somehow or other.
*/
void
scan_input(char *filename)
{
plan_a(filename);
if (verbose)
say("Patching file %s using Plan A...\n", filename);
}
/*
* Try keeping everything in memory.
*/
static void
plan_a(char *filename)
{
int ifd, statfailed;
char *s;
LINENUM iline;
char lbuf[MAXLINELEN];
statfailed = stat(filename, &filestat);
if (statfailed && ok_to_create_file) {
if (verbose)
say("(Creating file %s...)\n",filename);
makedirs(filename, TRUE);
close(creat(filename, 0666));
statfailed = stat(filename, &filestat);
}
/*
* For nonexistent or read-only files, look for RCS or SCCS
* versions.
*/
if (statfailed ||
/* No one can write to it. */
(filestat.st_mode & 0222) == 0 ||
/* I can't write to it. */
((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)) {
struct stat cstat;
const char *cs = NULL;
char *filebase;
size_t pathlen;
filebase = basename(filename);
pathlen = filebase - filename;
/*
* Put any leading path into `s'.
* Leave room in lbuf for the diff command.
*/
s = lbuf + 20;
if (pathlen >= sizeof(lbuf) - 20)
fatal("file name too long\n");
strncpy(s, filename, pathlen);
s[pathlen] = '\0';
#define try(f, a1, a2) (snprintf(s + pathlen, sizeof(lbuf) - (s + pathlen - lbuf), f, a1, a2), stat(s, &cstat) == 0)
#define try1(f, a1) (snprintf(s + pathlen, sizeof(lbuf) - (s + pathlen - lbuf), f, a1), stat(s, &cstat) == 0)
if (try("RCS/%s%s", filebase, RCSSUFFIX) ||
try1("RCS/%s" , filebase) ||
try("%s%s", filebase, RCSSUFFIX)) {
snprintf(buf, sizeof(buf), CHECKOUT, filename);
snprintf(lbuf, sizeof(lbuf), RCSDIFF, filename);
cs = "RCS";
} else if (try("SCCS/%s%s", SCCSPREFIX, filebase) ||
try("%s%s", SCCSPREFIX, filebase)) {
snprintf(buf, sizeof(buf), GET, s);
snprintf(lbuf, sizeof(lbuf), SCCSDIFF, s, filename);
cs = "SCCS";
} else if (statfailed)
fatal("can't find %s\n", filename);
/*
* else we can't write to it but it's not under a version
* control system, so just proceed.
*/
if (cs) {
if (!statfailed) {
if ((filestat.st_mode & 0222) != 0)
/* The owner can write to it. */
fatal(
"file %s seems to be locked by somebody else under %s\n",
filename, cs);
/*
* It might be checked out unlocked. See if
* it's safe to check out the default version
* locked.
*/
if (verbose)
say(
"Comparing file %s to default %s version...\n",
filename, cs);
if (system(lbuf))
fatal(
"can't check out file %s: differs from default %s version\n",
filename, cs);
}
if (verbose)
say("Checking out file %s from %s...\n",
filename, cs);
if (system(buf) || stat(filename, &filestat))
fatal("can't check out file %s from %s\n",
filename, cs);
}
}
if (old_file_is_dev_null &&
ok_to_create_file &&
(filestat.st_size != 0)) {
fatal(
"patch creates new file but existing file %s not empty\n",
filename);
}
filemode = filestat.st_mode;
if (!S_ISREG(filemode))
fatal("%s is not a normal file--can't patch\n", filename);
i_size = filestat.st_size;
i_womp = xmalloc(i_size + 2);
if ((ifd = open(filename, 0)) < 0)
pfatal("can't open file %s", filename);
if (read(ifd, i_womp, i_size) != i_size)
pfatal("read error");
Close(ifd);
if (i_size && i_womp[i_size - 1] != '\n')
i_womp[i_size++] = '\n';
i_womp[i_size] = '\0';
/*
* Count the lines in the buffer so we know how many pointers we
* need.
*/
iline = 0;
for (s = i_womp; *s; s++) {
if (*s == '\n')
iline++;
}
i_ptr = xmalloc((iline + 2) * sizeof(char *));
/* Now scan the buffer and build pointer array. */
iline = 1;
i_ptr[iline] = i_womp;
for (s = i_womp; *s; s++) {
if (*s == '\n') {
/* These are NOT null terminated. */
i_ptr[++iline] = s + 1;
}
}
input_lines = iline - 1;
/* Now check for revision, if any. */
if (revision != NULL) {
if (!rev_in_string(i_womp)) {
if (force) {
if (verbose)
say(
"Warning: this file doesn't appear to be the %s version--patching anyway.\n",
revision);
} else if (batch) {
fatal(
"this file doesn't appear to be the %s version--aborting.\n", revision);
} else {
ask(
"This file doesn't appear to be the %s version--patch anyway? [n] ",
revision);
if (*buf != 'y')
fatal("aborted\n");
}
} else if (verbose)
say("Good. This file appears to be the %s version.\n",
revision);
}
}
/*
* Fetch a line from the input file, \n terminated, not necessarily \0.
*/
const char *
ifetch(LINENUM line)
{
if (line < 1 || line > input_lines)
return "";
return i_ptr[line];
}
/*
* True if the string argument contains the revision number we want.
*/
static bool
rev_in_string(char *string)
{
char *s;
size_t patlen;
if (revision == NULL)
return TRUE;
patlen = strlen(revision);
if (strnEQ(string,revision,patlen) &&
isspace((unsigned char)string[patlen]))
return TRUE;
for (s = string; *s; s++) {
if (isspace((unsigned char)*s) &&
strnEQ(s + 1, revision, patlen) &&
isspace((unsigned char)s[patlen + 1] )) {
return TRUE;
}
}
return FALSE;
}