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freebsd-dev/usr.bin/patch/patch.c
Pedro F. Giffuni 5e64d66ca4 patch: add dry-run alias for compatibility with other implementations. 
Other implementations of patch(1), including GNU patch and "svn patch"
have a --dry-run option which does the same as our -C or --check
option.

Add a new alias to make our implementation more compatible.

MFC after:	1 week
2014-06-15 16:38:17 +00:00

1080 lines
26 KiB
C
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/*-
* Copyright 1986, 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.
*
* patch - a program to apply diffs to original files
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*
* $OpenBSD: patch.c,v 1.50 2012/05/15 19:32:02 millert Exp $
* $FreeBSD$
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <getopt.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "common.h"
#include "util.h"
#include "pch.h"
#include "inp.h"
#include "backupfile.h"
#include "pathnames.h"
mode_t filemode = 0644;
char *buf; /* general purpose buffer */
size_t buf_size; /* size of the general purpose buffer */
bool using_plan_a = true; /* try to keep everything in memory */
bool out_of_mem = false; /* ran out of memory in plan a */
#define MAXFILEC 2
char *filearg[MAXFILEC];
bool ok_to_create_file = false;
char *outname = NULL;
char *origprae = NULL;
char *TMPOUTNAME;
char *TMPINNAME;
char *TMPREJNAME;
char *TMPPATNAME;
bool toutkeep = false;
bool trejkeep = false;
bool warn_on_invalid_line;
bool last_line_missing_eol;
#ifdef DEBUGGING
int debug = 0;
#endif
bool force = false;
bool batch = false;
bool verbose = true;
bool reverse = false;
bool noreverse = false;
bool skip_rest_of_patch = false;
int strippath = 957;
bool canonicalize = false;
bool check_only = false;
int diff_type = 0;
char *revision = NULL; /* prerequisite revision, if any */
LINENUM input_lines = 0; /* how long is input file in lines */
int posix = 0; /* strict POSIX mode? */
static void reinitialize_almost_everything(void);
static void get_some_switches(void);
static LINENUM locate_hunk(LINENUM);
static void abort_context_hunk(void);
static void rej_line(int, LINENUM);
static void abort_hunk(void);
static void apply_hunk(LINENUM);
static void init_output(const char *);
static void init_reject(const char *);
static void copy_till(LINENUM, bool);
static bool spew_output(void);
static void dump_line(LINENUM, bool);
static bool patch_match(LINENUM, LINENUM, LINENUM);
static bool similar(const char *, const char *, int);
static void usage(void);
/* true if -E was specified on command line. */
static bool remove_empty_files = false;
/* true if -R was specified on command line. */
static bool reverse_flag_specified = false;
/* buffer holding the name of the rejected patch file. */
static char rejname[NAME_MAX + 1];
/* how many input lines have been irretractibly output */
static LINENUM last_frozen_line = 0;
static int Argc; /* guess */
static char **Argv;
static int Argc_last; /* for restarting plan_b */
static char **Argv_last;
static FILE *ofp = NULL; /* output file pointer */
static FILE *rejfp = NULL; /* reject file pointer */
static int filec = 0; /* how many file arguments? */
static LINENUM last_offset = 0;
static LINENUM maxfuzz = 2;
/* patch using ifdef, ifndef, etc. */
static bool do_defines = false;
/* #ifdef xyzzy */
static char if_defined[128];
/* #ifndef xyzzy */
static char not_defined[128];
/* #else */
static const char else_defined[] = "#else\n";
/* #endif xyzzy */
static char end_defined[128];
/* Apply a set of diffs as appropriate. */
int
main(int argc, char *argv[])
{
int error = 0, hunk, failed, i, fd;
bool patch_seen, reverse_seen;
LINENUM where = 0, newwhere, fuzz, mymaxfuzz;
const char *tmpdir;
char *v;
setlinebuf(stdout);
setlinebuf(stderr);
for (i = 0; i < MAXFILEC; i++)
filearg[i] = NULL;
buf_size = INITLINELEN;
buf = malloc((unsigned)(buf_size));
if (buf == NULL)
fatal("out of memory\n");
/* Cons up the names of the temporary files. */
if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
tmpdir = _PATH_TMP;
for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
;
i++;
if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
fatal("cannot allocate memory");
if ((fd = mkstemp(TMPOUTNAME)) < 0)
pfatal("can't create %s", TMPOUTNAME);
close(fd);
if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
fatal("cannot allocate memory");
if ((fd = mkstemp(TMPINNAME)) < 0)
pfatal("can't create %s", TMPINNAME);
close(fd);
if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
fatal("cannot allocate memory");
if ((fd = mkstemp(TMPREJNAME)) < 0)
pfatal("can't create %s", TMPREJNAME);
close(fd);
if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
fatal("cannot allocate memory");
if ((fd = mkstemp(TMPPATNAME)) < 0)
pfatal("can't create %s", TMPPATNAME);
close(fd);
v = getenv("SIMPLE_BACKUP_SUFFIX");
if (v)
simple_backup_suffix = v;
else
simple_backup_suffix = ORIGEXT;
/* parse switches */
Argc = argc;
Argv = argv;
get_some_switches();
if (backup_type == none) {
if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
v = getenv("VERSION_CONTROL");
if (v != NULL || !posix)
backup_type = get_version(v); /* OK to pass NULL. */
}
/* make sure we clean up /tmp in case of disaster */
set_signals(0);
patch_seen = false;
for (open_patch_file(filearg[1]); there_is_another_patch();
reinitialize_almost_everything()) {
/* for each patch in patch file */
patch_seen = true;
warn_on_invalid_line = true;
if (outname == NULL)
outname = savestr(filearg[0]);
/* for ed script just up and do it and exit */
if (diff_type == ED_DIFF) {
do_ed_script();
continue;
}
/* initialize the patched file */
if (!skip_rest_of_patch)
init_output(TMPOUTNAME);
/* initialize reject file */
init_reject(TMPREJNAME);
/* find out where all the lines are */
if (!skip_rest_of_patch)
scan_input(filearg[0]);
/*
* from here on, open no standard i/o files, because
* malloc might misfire and we can't catch it easily
*/
/* apply each hunk of patch */
hunk = 0;
failed = 0;
reverse_seen = false;
out_of_mem = false;
while (another_hunk()) {
hunk++;
fuzz = 0;
mymaxfuzz = pch_context();
if (maxfuzz < mymaxfuzz)
mymaxfuzz = maxfuzz;
if (!skip_rest_of_patch) {
do {
where = locate_hunk(fuzz);
if (hunk == 1 && where == 0 && !force && !reverse_seen) {
/* dwim for reversed patch? */
if (!pch_swap()) {
if (fuzz == 0)
say("Not enough memory to try swapped hunk! Assuming unswapped.\n");
continue;
}
reverse = !reverse;
/* try again */
where = locate_hunk(fuzz);
if (where == 0) {
/* didn't find it swapped */
if (!pch_swap())
/* put it back to normal */
fatal("lost hunk on alloc error!\n");
reverse = !reverse;
} else if (noreverse) {
if (!pch_swap())
/* put it back to normal */
fatal("lost hunk on alloc error!\n");
reverse = !reverse;
say("Ignoring previously applied (or reversed) patch.\n");
skip_rest_of_patch = true;
} else if (batch) {
if (verbose)
say("%seversed (or previously applied) patch detected! %s -R.",
reverse ? "R" : "Unr",
reverse ? "Assuming" : "Ignoring");
} else {
ask("%seversed (or previously applied) patch detected! %s -R? [y] ",
reverse ? "R" : "Unr",
reverse ? "Assume" : "Ignore");
if (*buf == 'n') {
ask("Apply anyway? [n] ");
if (*buf != 'y')
skip_rest_of_patch = true;
else
reverse_seen = true;
where = 0;
reverse = !reverse;
if (!pch_swap())
/* put it back to normal */
fatal("lost hunk on alloc error!\n");
}
}
}
} while (!skip_rest_of_patch && where == 0 &&
++fuzz <= mymaxfuzz);
if (skip_rest_of_patch) { /* just got decided */
if (ferror(ofp) || fclose(ofp)) {
say("Error writing %s\n",
TMPOUTNAME);
error = 1;
}
ofp = NULL;
}
}
newwhere = pch_newfirst() + last_offset;
if (skip_rest_of_patch) {
abort_hunk();
failed++;
if (verbose)
say("Hunk #%d ignored at %ld.\n",
hunk, newwhere);
} else if (where == 0) {
abort_hunk();
failed++;
if (verbose)
say("Hunk #%d failed at %ld.\n",
hunk, newwhere);
} else {
apply_hunk(where);
if (verbose) {
say("Hunk #%d succeeded at %ld",
hunk, newwhere);
if (fuzz != 0)
say(" with fuzz %ld", fuzz);
if (last_offset)
say(" (offset %ld line%s)",
last_offset,
last_offset == 1L ? "" : "s");
say(".\n");
}
}
}
if (out_of_mem && using_plan_a) {
Argc = Argc_last;
Argv = Argv_last;
say("\n\nRan out of memory using Plan A--trying again...\n\n");
if (ofp)
fclose(ofp);
ofp = NULL;
if (rejfp)
fclose(rejfp);
rejfp = NULL;
continue;
}
if (hunk == 0)
fatal("Internal error: hunk should not be 0\n");
/* finish spewing out the new file */
if (!skip_rest_of_patch && !spew_output()) {
say("Can't write %s\n", TMPOUTNAME);
error = 1;
}
/* and put the output where desired */
ignore_signals();
if (!skip_rest_of_patch) {
struct stat statbuf;
char *realout = outname;
if (!check_only) {
if (move_file(TMPOUTNAME, outname) < 0) {
toutkeep = true;
realout = TMPOUTNAME;
chmod(TMPOUTNAME, filemode);
} else
chmod(outname, filemode);
if (remove_empty_files &&
stat(realout, &statbuf) == 0 &&
statbuf.st_size == 0) {
if (verbose)
say("Removing %s (empty after patching).\n",
realout);
unlink(realout);
}
}
}
if (ferror(rejfp) || fclose(rejfp)) {
say("Error writing %s\n", rejname);
error = 1;
}
rejfp = NULL;
if (failed) {
error = 1;
if (*rejname == '\0') {
if (strlcpy(rejname, outname,
sizeof(rejname)) >= sizeof(rejname))
fatal("filename %s is too long\n", outname);
if (strlcat(rejname, REJEXT,
sizeof(rejname)) >= sizeof(rejname))
fatal("filename %s is too long\n", outname);
}
if (!check_only)
say("%d out of %d hunks %s--saving rejects to %s\n",
failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname);
else
say("%d out of %d hunks %s while patching %s\n",
failed, hunk, skip_rest_of_patch ? "ignored" : "failed", filearg[0]);
if (!check_only && move_file(TMPREJNAME, rejname) < 0)
trejkeep = true;
}
set_signals(1);
}
if (!patch_seen)
error = 2;
my_exit(error);
/* NOTREACHED */
}
/* Prepare to find the next patch to do in the patch file. */
static void
reinitialize_almost_everything(void)
{
re_patch();
re_input();
input_lines = 0;
last_frozen_line = 0;
filec = 0;
if (!out_of_mem) {
free(filearg[0]);
filearg[0] = NULL;
}
free(outname);
outname = NULL;
last_offset = 0;
diff_type = 0;
free(revision);
revision = NULL;
reverse = reverse_flag_specified;
skip_rest_of_patch = false;
get_some_switches();
}
/* Process switches and filenames. */
static void
get_some_switches(void)
{
const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
static struct option longopts[] = {
{"backup", no_argument, 0, 'b'},
{"batch", no_argument, 0, 't'},
{"check", no_argument, 0, 'C'},
{"context", no_argument, 0, 'c'},
{"debug", required_argument, 0, 'x'},
{"directory", required_argument, 0, 'd'},
{"dry-run", no_argument, 0, 'C'},
{"ed", no_argument, 0, 'e'},
{"force", no_argument, 0, 'f'},
{"forward", no_argument, 0, 'N'},
{"fuzz", required_argument, 0, 'F'},
{"ifdef", required_argument, 0, 'D'},
{"input", required_argument, 0, 'i'},
{"ignore-whitespace", no_argument, 0, 'l'},
{"normal", no_argument, 0, 'n'},
{"output", required_argument, 0, 'o'},
{"prefix", required_argument, 0, 'B'},
{"quiet", no_argument, 0, 's'},
{"reject-file", required_argument, 0, 'r'},
{"remove-empty-files", no_argument, 0, 'E'},
{"reverse", no_argument, 0, 'R'},
{"silent", no_argument, 0, 's'},
{"strip", required_argument, 0, 'p'},
{"suffix", required_argument, 0, 'z'},
{"unified", no_argument, 0, 'u'},
{"version", no_argument, 0, 'v'},
{"version-control", required_argument, 0, 'V'},
{"posix", no_argument, &posix, 1},
{NULL, 0, 0, 0}
};
int ch;
rejname[0] = '\0';
Argc_last = Argc;
Argv_last = Argv;
if (!Argc)
return;
optreset = optind = 1;
while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
switch (ch) {
case 'b':
if (backup_type == none)
backup_type = numbered_existing;
if (optarg == NULL)
break;
if (verbose)
say("Warning, the ``-b suffix'' option has been"
" obsoleted by the -z option.\n");
/* FALLTHROUGH */
case 'z':
/* must directly follow 'b' case for backwards compat */
simple_backup_suffix = savestr(optarg);
break;
case 'B':
origprae = savestr(optarg);
break;
case 'c':
diff_type = CONTEXT_DIFF;
break;
case 'C':
check_only = true;
break;
case 'd':
if (chdir(optarg) < 0)
pfatal("can't cd to %s", optarg);
break;
case 'D':
do_defines = true;
if (!isalpha((unsigned char)*optarg) && *optarg != '_')
fatal("argument to -D is not an identifier\n");
snprintf(if_defined, sizeof if_defined,
"#ifdef %s\n", optarg);
snprintf(not_defined, sizeof not_defined,
"#ifndef %s\n", optarg);
snprintf(end_defined, sizeof end_defined,
"#endif /* %s */\n", optarg);
break;
case 'e':
diff_type = ED_DIFF;
break;
case 'E':
remove_empty_files = true;
break;
case 'f':
force = true;
break;
case 'F':
maxfuzz = atoi(optarg);
break;
case 'i':
if (++filec == MAXFILEC)
fatal("too many file arguments\n");
filearg[filec] = savestr(optarg);
break;
case 'l':
canonicalize = true;
break;
case 'n':
diff_type = NORMAL_DIFF;
break;
case 'N':
noreverse = true;
break;
case 'o':
outname = savestr(optarg);
break;
case 'p':
strippath = atoi(optarg);
break;
case 'r':
if (strlcpy(rejname, optarg,
sizeof(rejname)) >= sizeof(rejname))
fatal("argument for -r is too long\n");
break;
case 'R':
reverse = true;
reverse_flag_specified = true;
break;
case 's':
verbose = false;
break;
case 't':
batch = true;
break;
case 'u':
diff_type = UNI_DIFF;
break;
case 'v':
version();
break;
case 'V':
backup_type = get_version(optarg);
break;
#ifdef DEBUGGING
case 'x':
debug = atoi(optarg);
break;
#endif
default:
if (ch != '\0')
usage();
break;
}
}
Argc -= optind;
Argv += optind;
if (Argc > 0) {
filearg[0] = savestr(*Argv++);
Argc--;
while (Argc > 0) {
if (++filec == MAXFILEC)
fatal("too many file arguments\n");
filearg[filec] = savestr(*Argv++);
Argc--;
}
}
if (getenv("POSIXLY_CORRECT") != NULL)
posix = 1;
}
static void
usage(void)
{
fprintf(stderr,
"usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
" [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
" [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n"
" [--posix] [origfile [patchfile]]\n"
" patch <patchfile\n");
my_exit(EXIT_SUCCESS);
}
/*
* Attempt to find the right place to apply this hunk of patch.
*/
static LINENUM
locate_hunk(LINENUM fuzz)
{
LINENUM first_guess = pch_first() + last_offset;
LINENUM offset;
LINENUM pat_lines = pch_ptrn_lines();
LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
if (pat_lines == 0) { /* null range matches always */
if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
|| diff_type == NEW_CONTEXT_DIFF
|| diff_type == UNI_DIFF)) {
say("Empty context always matches.\n");
}
return (first_guess);
}
if (max_neg_offset >= first_guess) /* do not try lines < 0 */
max_neg_offset = first_guess - 1;
if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
return first_guess;
for (offset = 1; ; offset++) {
bool check_after = (offset <= max_pos_offset);
bool check_before = (offset <= max_neg_offset);
if (check_after && patch_match(first_guess, offset, fuzz)) {
#ifdef DEBUGGING
if (debug & 1)
say("Offset changing from %ld to %ld\n",
last_offset, offset);
#endif
last_offset = offset;
return first_guess + offset;
} else if (check_before && patch_match(first_guess, -offset, fuzz)) {
#ifdef DEBUGGING
if (debug & 1)
say("Offset changing from %ld to %ld\n",
last_offset, -offset);
#endif
last_offset = -offset;
return first_guess - offset;
} else if (!check_before && !check_after)
return 0;
}
}
/* We did not find the pattern, dump out the hunk so they can handle it. */
static void
abort_context_hunk(void)
{
LINENUM i;
const LINENUM pat_end = pch_end();
/*
* add in last_offset to guess the same as the previous successful
* hunk
*/
const LINENUM oldfirst = pch_first() + last_offset;
const LINENUM newfirst = pch_newfirst() + last_offset;
const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
const LINENUM newlast = newfirst + pch_repl_lines() - 1;
const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
fprintf(rejfp, "***************\n");
for (i = 0; i <= pat_end; i++) {
switch (pch_char(i)) {
case '*':
if (oldlast < oldfirst)
fprintf(rejfp, "*** 0%s\n", stars);
else if (oldlast == oldfirst)
fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
else
fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
oldlast, stars);
break;
case '=':
if (newlast < newfirst)
fprintf(rejfp, "--- 0%s\n", minuses);
else if (newlast == newfirst)
fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
else
fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
newlast, minuses);
break;
case '\n':
fprintf(rejfp, "%s", pfetch(i));
break;
case ' ':
case '-':
case '+':
case '!':
fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
break;
default:
fatal("fatal internal error in abort_context_hunk\n");
}
}
}
static void
rej_line(int ch, LINENUM i)
{
unsigned short len;
const char *line = pfetch(i);
len = strnlen(line, USHRT_MAX);
fprintf(rejfp, "%c%s", ch, line);
if (len == 0 || line[len-1] != '\n') {
if (len >= USHRT_MAX)
fprintf(rejfp, "\n\\ Line too long\n");
else
fprintf(rejfp, "\n\\ No newline at end of line\n");
}
}
static void
abort_hunk(void)
{
LINENUM i, j, split;
int ch1, ch2;
const LINENUM pat_end = pch_end();
const LINENUM oldfirst = pch_first() + last_offset;
const LINENUM newfirst = pch_newfirst() + last_offset;
if (diff_type != UNI_DIFF) {
abort_context_hunk();
return;
}
split = -1;
for (i = 0; i <= pat_end; i++) {
if (pch_char(i) == '=') {
split = i;
break;
}
}
if (split == -1) {
fprintf(rejfp, "malformed hunk: no split found\n");
return;
}
i = 0;
j = split + 1;
fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
pch_ptrn_lines() ? oldfirst : 0,
pch_ptrn_lines(), newfirst, pch_repl_lines());
while (i < split || j <= pat_end) {
ch1 = i < split ? pch_char(i) : -1;
ch2 = j <= pat_end ? pch_char(j) : -1;
if (ch1 == '-') {
rej_line('-', i);
i++;
} else if (ch1 == ' ' && ch2 == ' ') {
rej_line(' ', i);
i++;
j++;
} else if (ch1 == '!' && ch2 == '!') {
while (i < split && ch1 == '!') {
rej_line('-', i);
i++;
ch1 = i < split ? pch_char(i) : -1;
}
while (j <= pat_end && ch2 == '!') {
rej_line('+', j);
j++;
ch2 = j <= pat_end ? pch_char(j) : -1;
}
} else if (ch1 == '*') {
i++;
} else if (ch2 == '+' || ch2 == ' ') {
rej_line(ch2, j);
j++;
} else {
fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
i, split, j);
rej_line(ch1, i);
rej_line(ch2, j);
return;
}
}
}
/* We found where to apply it (we hope), so do it. */
static void
apply_hunk(LINENUM where)
{
LINENUM old = 1;
const LINENUM lastline = pch_ptrn_lines();
LINENUM new = lastline + 1;
#define OUTSIDE 0
#define IN_IFNDEF 1
#define IN_IFDEF 2
#define IN_ELSE 3
int def_state = OUTSIDE;
const LINENUM pat_end = pch_end();
where--;
while (pch_char(new) == '=' || pch_char(new) == '\n')
new++;
while (old <= lastline) {
if (pch_char(old) == '-') {
copy_till(where + old - 1, false);
if (do_defines) {
if (def_state == OUTSIDE) {
fputs(not_defined, ofp);
def_state = IN_IFNDEF;
} else if (def_state == IN_IFDEF) {
fputs(else_defined, ofp);
def_state = IN_ELSE;
}
fputs(pfetch(old), ofp);
}
last_frozen_line++;
old++;
} else if (new > pat_end) {
break;
} else if (pch_char(new) == '+') {
copy_till(where + old - 1, false);
if (do_defines) {
if (def_state == IN_IFNDEF) {
fputs(else_defined, ofp);
def_state = IN_ELSE;
} else if (def_state == OUTSIDE) {
fputs(if_defined, ofp);
def_state = IN_IFDEF;
}
}
fputs(pfetch(new), ofp);
new++;
} else if (pch_char(new) != pch_char(old)) {
say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
pch_hunk_beg() + old,
pch_hunk_beg() + new);
#ifdef DEBUGGING
say("oldchar = '%c', newchar = '%c'\n",
pch_char(old), pch_char(new));
#endif
my_exit(2);
} else if (pch_char(new) == '!') {
copy_till(where + old - 1, false);
if (do_defines) {
fputs(not_defined, ofp);
def_state = IN_IFNDEF;
}
while (pch_char(old) == '!') {
if (do_defines) {
fputs(pfetch(old), ofp);
}
last_frozen_line++;
old++;
}
if (do_defines) {
fputs(else_defined, ofp);
def_state = IN_ELSE;
}
while (pch_char(new) == '!') {
fputs(pfetch(new), ofp);
new++;
}
} else {
if (pch_char(new) != ' ')
fatal("Internal error: expected ' '\n");
old++;
new++;
if (do_defines && def_state != OUTSIDE) {
fputs(end_defined, ofp);
def_state = OUTSIDE;
}
}
}
if (new <= pat_end && pch_char(new) == '+') {
copy_till(where + old - 1, false);
if (do_defines) {
if (def_state == OUTSIDE) {
fputs(if_defined, ofp);
def_state = IN_IFDEF;
} else if (def_state == IN_IFNDEF) {
fputs(else_defined, ofp);
def_state = IN_ELSE;
}
}
while (new <= pat_end && pch_char(new) == '+') {
fputs(pfetch(new), ofp);
new++;
}
}
if (do_defines && def_state != OUTSIDE) {
fputs(end_defined, ofp);
}
}
/*
* Open the new file.
*/
static void
init_output(const char *name)
{
ofp = fopen(name, "w");
if (ofp == NULL)
pfatal("can't create %s", name);
}
/*
* Open a file to put hunks we can't locate.
*/
static void
init_reject(const char *name)
{
rejfp = fopen(name, "w");
if (rejfp == NULL)
pfatal("can't create %s", name);
}
/*
* Copy input file to output, up to wherever hunk is to be applied.
* If endoffile is true, treat the last line specially since it may
* lack a newline.
*/
static void
copy_till(LINENUM lastline, bool endoffile)
{
if (last_frozen_line > lastline)
fatal("misordered hunks! output would be garbled\n");
while (last_frozen_line < lastline) {
if (++last_frozen_line == lastline && endoffile)
dump_line(last_frozen_line, !last_line_missing_eol);
else
dump_line(last_frozen_line, true);
}
}
/*
* Finish copying the input file to the output file.
*/
static bool
spew_output(void)
{
int rv;
#ifdef DEBUGGING
if (debug & 256)
say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
#endif
if (input_lines)
copy_till(input_lines, true); /* dump remainder of file */
rv = ferror(ofp) == 0 && fclose(ofp) == 0;
ofp = NULL;
return rv;
}
/*
* Copy one line from input to output.
*/
static void
dump_line(LINENUM line, bool write_newline)
{
char *s;
s = ifetch(line, 0);
if (s == NULL)
return;
/* Note: string is not NUL terminated. */
for (; *s != '\n'; s++)
putc(*s, ofp);
if (write_newline)
putc('\n', ofp);
}
/*
* Does the patch pattern match at line base+offset?
*/
static bool
patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
{
LINENUM pline = 1 + fuzz;
LINENUM iline;
LINENUM pat_lines = pch_ptrn_lines() - fuzz;
const char *ilineptr;
const char *plineptr;
unsigned short plinelen;
for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
ilineptr = ifetch(iline, offset >= 0);
if (ilineptr == NULL)
return false;
plineptr = pfetch(pline);
plinelen = pch_line_len(pline);
if (canonicalize) {
if (!similar(ilineptr, plineptr, plinelen))
return false;
} else if (strnNE(ilineptr, plineptr, plinelen))
return false;
if (iline == input_lines) {
/*
* We are looking at the last line of the file.
* If the file has no eol, the patch line should
* not have one either and vice-versa. Note that
* plinelen > 0.
*/
if (last_line_missing_eol) {
if (plineptr[plinelen - 1] == '\n')
return false;
} else {
if (plineptr[plinelen - 1] != '\n')
return false;
}
}
}
return true;
}
/*
* Do two lines match with canonicalized white space?
*/
static bool
similar(const char *a, const char *b, int len)
{
while (len) {
if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */
if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */
return false;
while (len && isspace((unsigned char)*b) && *b != '\n')
b++, len--; /* skip pattern whitespace */
while (isspace((unsigned char)*a) && *a != '\n')
a++; /* skip target whitespace */
if (*a == '\n' || *b == '\n')
return (*a == *b); /* should end in sync */
} else if (*a++ != *b++) /* match non-whitespace chars */
return false;
else
len--; /* probably not necessary */
}
return true; /* actually, this is not reached */
/* since there is always a \n */
}
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