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original netbsd patch

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This commit is contained in:
Ben Gras 2010-06-22 00:41:00 +00:00
parent 6657c0e58e
commit f50f1bf7d6
14 changed files with 4913 additions and 0 deletions
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8
commands/patch/Makefile Normal file
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# $NetBSD: Makefile,v 1.9 2008/09/19 18:33:34 joerg Exp $
# $OpenBSD: Makefile,v 1.4 2005/05/16 15:22:46 espie Exp $
# $DragonFly: src/usr.bin/patch/Makefile,v 1.8 2008/08/10 23:50:12 joerg Exp $
PROG= patch
SRCS= patch.c pch.c inp.c util.c backupfile.c mkpath.c
.include <bsd.prog.mk>

254
commands/patch/backupfile.c Normal file
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/*
* $OpenBSD: backupfile.c,v 1.19 2006/03/11 19:41:30 otto Exp $
* $DragonFly: src/usr.bin/patch/backupfile.c,v 1.5 2008/08/11 00:05:06 joerg Exp $
* $NetBSD: backupfile.c,v 1.14 2008/09/19 18:33:34 joerg Exp $
*/
/*
* backupfile.c -- make Emacs style backup file names
*
* Copyright (C) 1990 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* without restriction.
*
* 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.
*/
/*
* David MacKenzie <djm@ai.mit.edu>. Some algorithms adapted from GNU Emacs.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: backupfile.c,v 1.14 2008/09/19 18:33:34 joerg Exp $");
#include <ctype.h>
#include <dirent.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "backupfile.h"
#define ISDIGIT(c) (isascii ((unsigned char)c) && isdigit ((unsigned char)c))
/* Which type of backup file names are generated. */
enum backup_type backup_type = none;
/*
* The extension added to file names to produce a simple (as opposed to
* numbered) backup file name.
*/
const char *simple_backup_suffix = "~";
static char *concat(const char *, const char *);
static char *make_version_name(const char *, int);
static int max_backup_version(const char *, const char *);
static int version_number(const char *, const char *, size_t);
static int argmatch(const char *, const char **);
static void invalid_arg(const char *, const char *, int);
/*
* Return the name of the new backup file for file FILE, allocated with
* malloc. Return 0 if out of memory. FILE must not end with a '/' unless it
* is the root directory. Do not call this function if backup_type == none.
*/
char *
find_backup_file_name(const char *file)
{
char *dir, *base_versions, *tmp_file;
int highest_backup;
if (backup_type == simple)
return concat(file, simple_backup_suffix);
tmp_file = strdup(file);
if (tmp_file == NULL)
return NULL;
base_versions = concat(basename(tmp_file), ".~");
free(tmp_file);
if (base_versions == NULL)
return NULL;
tmp_file = strdup(file);
if (tmp_file == NULL) {
free(base_versions);
return NULL;
}
dir = dirname(tmp_file);
if (dir == NULL) {
free(base_versions);
free(tmp_file);
return NULL;
}
highest_backup = max_backup_version(base_versions, dir);
free(base_versions);
free(tmp_file);
if (backup_type == numbered_existing && highest_backup == 0)
return concat(file, simple_backup_suffix);
return make_version_name(file, highest_backup + 1);
}
/*
* Return the number of the highest-numbered backup file for file FILE in
* directory DIR. If there are no numbered backups of FILE in DIR, or an
* error occurs reading DIR, return 0. FILE should already have ".~" appended
* to it.
*/
static int
max_backup_version(const char *file, const char *dir)
{
DIR *dirp;
struct dirent *dp;
int highest_version, this_version;
size_t file_name_length;
dirp = opendir(dir);
if (dirp == NULL)
return 0;
highest_version = 0;
file_name_length = strlen(file);
while ((dp = readdir(dirp)) != NULL) {
if (dp->d_namlen <= file_name_length)
continue;
this_version = version_number(file, dp->d_name, file_name_length);
if (this_version > highest_version)
highest_version = this_version;
}
closedir(dirp);
return highest_version;
}
/*
* Return a string, allocated with malloc, containing "FILE.~VERSION~".
* Return 0 if out of memory.
*/
static char *
make_version_name(const char *file, int version)
{
char *backup_name;
if (asprintf(&backup_name, "%s.~%d~", file, version) == -1)
return NULL;
return backup_name;
}
/*
* If BACKUP is a numbered backup of BASE, return its version number;
* otherwise return 0. BASE_LENGTH is the length of BASE. BASE should
* already have ".~" appended to it.
*/
static int
version_number(const char *base, const char *backup, size_t base_length)
{
int version;
const char *p;
version = 0;
if (!strncmp(base, backup, base_length) && ISDIGIT(backup[base_length])) {
for (p = &backup[base_length]; ISDIGIT(*p); ++p)
version = version * 10 + *p - '0';
if (p[0] != '~' || p[1])
version = 0;
}
return version;
}
/*
* Return the newly-allocated concatenation of STR1 and STR2. If out of
* memory, return 0.
*/
static char *
concat(const char *str1, const char *str2)
{
char *newstr;
if (asprintf(&newstr, "%s%s", str1, str2) == -1)
return NULL;
return newstr;
}
/*
* If ARG is an unambiguous match for an element of the null-terminated array
* OPTLIST, return the index in OPTLIST of the matched element, else -1 if it
* does not match any element or -2 if it is ambiguous (is a prefix of more
* than one element).
*/
static int
argmatch(const char *arg, const char **optlist)
{
int i; /* Temporary index in OPTLIST. */
size_t arglen; /* Length of ARG. */
int matchind = -1; /* Index of first nonexact match. */
int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
arglen = strlen(arg);
/* Test all elements for either exact match or abbreviated matches. */
for (i = 0; optlist[i]; i++) {
if (!strncmp(optlist[i], arg, arglen)) {
if (strlen(optlist[i]) == arglen)
/* Exact match found. */
return i;
else if (matchind == -1)
/* First nonexact match found. */
matchind = i;
else
/* Second nonexact match found. */
ambiguous = 1;
}
}
if (ambiguous)
return -2;
else
return matchind;
}
/*
* Error reporting for argmatch. KIND is a description of the type of entity
* that was being matched. VALUE is the invalid value that was given. PROBLEM
* is the return value from argmatch.
*/
static void
invalid_arg(const char *kind, const char *value, int problem)
{
fprintf(stderr, "patch: ");
if (problem == -1)
fprintf(stderr, "invalid");
else /* Assume -2. */
fprintf(stderr, "ambiguous");
fprintf(stderr, " %s `%s'\n", kind, value);
}
static const char *backup_args[] = {
"never", "simple", "nil", "existing", "t", "numbered", 0
};
static enum backup_type backup_types[] = {
simple, simple, numbered_existing,
numbered_existing, numbered, numbered
};
/*
* Return the type of backup indicated by VERSION. Unique abbreviations are
* accepted.
*/
enum backup_type
get_version(const char *version)
{
int i;
if (version == NULL || *version == '\0')
return numbered_existing;
i = argmatch(version, backup_args);
if (i >= 0)
return backup_types[i];
invalid_arg("version control type", version, i);
exit(2);
}

42
commands/patch/backupfile.h Normal file
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/*
* $OpenBSD: backupfile.h,v 1.6 2003/07/28 18:35:36 otto Exp $
* $DragonFly: src/usr.bin/patch/backupfile.h,v 1.3 2007/09/29 23:11:10 swildner Exp $
* $NetBSD: backupfile.h,v 1.6 2008/09/19 18:33:34 joerg Exp $
*/
/*
* backupfile.h -- declarations for making Emacs style backup file names
* Copyright (C) 1990 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* without restriction.
*
* 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.
*
*/
/* When to make backup files. */
enum backup_type {
/* Never make backups. */
none,
/* Make simple backups of every file. */
simple,
/*
* Make numbered backups of files that already have numbered backups,
* and simple backups of the others.
*/
numbered_existing,
/* Make numbered backups of every file. */
numbered
};
extern enum backup_type backup_type;
extern const char *simple_backup_suffix;
char *find_backup_file_name(const char *file);
enum backup_type get_version(const char *version);

122
commands/patch/common.h Normal file
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/*
* $OpenBSD: common.h,v 1.26 2006/03/11 19:41:30 otto Exp $
* $DragonFly: src/usr.bin/patch/common.h,v 1.5 2008/08/10 23:50:12 joerg Exp $
* $NetBSD: common.h,v 1.19 2008/09/19 18:33:34 joerg Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* 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.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
#include <sys/types.h>
#include <stdbool.h>
#include <stdint.h>
#define DEBUGGING
/* constants */
#define MAXHUNKSIZE 100000 /* is this enough lines? */
#define INITHUNKMAX 125 /* initial dynamic allocation size */
#define MAXLINELEN 8192
#define BUFFERSIZE 1024
#define SCCSPREFIX "s."
#define GET "get -e %s"
#define SCCSDIFF "get -p %s | diff - %s >/dev/null"
#define RCSSUFFIX ",v"
#define CHECKOUT "co -l %s"
#define RCSDIFF "rcsdiff %s > /dev/null"
#define ORIGEXT ".orig"
#define REJEXT ".rej"
/* handy definitions */
#define strNE(s1,s2) (strcmp(s1, s2))
#define strEQ(s1,s2) (!strcmp(s1, s2))
#define strnNE(s1,s2,l) (strncmp(s1, s2, l))
#define strnEQ(s1,s2,l) (!strncmp(s1, s2, l))
/* typedefs */
typedef long LINENUM; /* must be signed */
/* globals */
extern mode_t filemode;
extern char buf[MAXLINELEN];/* general purpose buffer */
extern size_t buf_len;
extern bool using_plan_a; /* try to keep everything in memory */
extern bool out_of_mem; /* ran out of memory in plan a */
#define MAXFILEC 2
extern char *filearg[MAXFILEC];
extern bool ok_to_create_file;
extern char *outname;
extern char *origprae;
extern char *TMPOUTNAME;
extern char *TMPINNAME;
extern char *TMPREJNAME;
extern char *TMPPATNAME;
extern bool toutkeep;
extern bool trejkeep;
#ifdef DEBUGGING
extern int debug;
#endif
extern bool force;
extern bool batch;
extern bool verbose;
extern bool reverse;
extern bool noreverse;
extern bool skip_rest_of_patch;
extern int strippath;
extern bool canonicalize;
/* TRUE if -C was specified on command line. */
extern bool check_only;
extern bool warn_on_invalid_line;
extern bool last_line_missing_eol;
#define CONTEXT_DIFF 1
#define NORMAL_DIFF 2
#define ED_DIFF 3
#define NEW_CONTEXT_DIFF 4
#define UNI_DIFF 5
extern int diff_type;
extern char *revision; /* prerequisite revision, if any */
extern LINENUM input_lines; /* how long is input file in lines */
extern int posix;

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/*
* $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $
* $DragonFly: src/usr.bin/patch/inp.c,v 1.6 2007/09/29 23:11:10 swildner Exp $
* $NetBSD: inp.c,v 1.19 2008/09/19 18:33:34 joerg Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* 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.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: inp.c,v 1.19 2008/09/19 18:33:34 joerg Exp $");
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <ctype.h>
#include <libgen.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "util.h"
#include "pch.h"
#include "inp.h"
/* Input-file-with-indexable-lines abstract type */
static off_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 */
static char empty_line[] = { '\0' };
static int tifd = -1; /* plan b virtual string array */
static char *tibuf[2]; /* plan b buffers */
static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
static LINENUM lines_per_buf; /* how many lines per buffer */
static int tireclen; /* length of records in tmp file */
static bool rev_in_string(const char *);
static bool reallocate_lines(size_t *);
/* returns false if insufficient memory */
static bool plan_a(const char *);
static void plan_b(const char *);
/* New patch--prepare to edit another file. */
void
re_input(void)
{
if (using_plan_a) {
i_size = 0;
free(i_ptr);
i_ptr = NULL;
if (i_womp != NULL) {
munmap(i_womp, i_size);
i_womp = NULL;
}
} else {
using_plan_a = true; /* maybe the next one is smaller */
close(tifd);
tifd = -1;
free(tibuf[0]);
free(tibuf[1]);
tibuf[0] = tibuf[1] = NULL;
tiline[0] = tiline[1] = -1;
tireclen = 0;
}
}
/* Construct the line index, somehow or other. */
void
scan_input(const char *filename)
{
if (!plan_a(filename))
plan_b(filename);
if (verbose) {
say("Patching file %s using Plan %s...\n", filename,
(using_plan_a ? "A" : "B"));
}
}
static bool
reallocate_lines(size_t *lines_allocated)
{
char **p;
size_t new_size;
new_size = *lines_allocated * 3 / 2;
p = realloc(i_ptr, (new_size + 2) * sizeof(char *));
if (p == NULL) { /* shucks, it was a near thing */
munmap(i_womp, i_size);
i_womp = NULL;
free(i_ptr);
i_ptr = NULL;
*lines_allocated = 0;
return false;
}
*lines_allocated = new_size;
i_ptr = p;
return true;
}
/* Try keeping everything in memory. */
static bool
plan_a(const char *filename)
{
int ifd, statfailed;
char *p, *s, lbuf[MAXLINELEN];
struct stat filestat;
off_t i;
ptrdiff_t sz;
size_t iline, lines_allocated;
#ifdef DEBUGGING
if (debug & 8)
return false;
#endif
if (filename == NULL || *filename == '\0')
return false;
statfailed = stat(filename, &filestat);
if (statfailed && ok_to_create_file) {
if (verbose)
say("(Creating file %s...)\n", filename);
/*
* in check_patch case, we still display `Creating file' even
* though we're not. The rule is that -C should be as similar
* to normal patch behavior as possible
*/
if (check_only)
return true;
makedirs(filename, true);
close(creat(filename, 0666));
statfailed = stat(filename, &filestat);
}
if (statfailed && check_only)
fatal("%s not found, -C mode, can't probe further\n", filename);
/* 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 != getuid())) {
const char *cs = NULL, *filebase, *filedir;
struct stat cstat;
char *tmp_filename1, *tmp_filename2;
tmp_filename1 = strdup(filename);
tmp_filename2 = strdup(filename);
if (tmp_filename1 == NULL || tmp_filename2 == NULL)
fatal("strdupping filename");
filebase = basename(tmp_filename1);
filedir = dirname(tmp_filename2);
/* Leave room in lbuf for the diff command. */
s = lbuf + 20;
#define try(f, a1, a2, a3) \
(snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
try("%s/RCS/%s%s", filedir, filebase, "") ||
try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
snprintf(buf, buf_len, CHECKOUT, filename);
snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
cs = "RCS";
} else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
try("%s/%s%s", filedir, SCCSPREFIX, filebase)) {
snprintf(buf, buf_len, GET, s);
snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename);
cs = "SCCS";
} else if (statfailed)
fatal("can't find %s\n", filename);
free(tmp_filename1);
free(tmp_filename2);
/*
* 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);
}
}
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;
if (out_of_mem) {
set_hunkmax(); /* make sure dynamic arrays are allocated */
out_of_mem = false;
return false; /* force plan b because plan a bombed */
}
if (i_size > SIZE_MAX) {
say("block too large to mmap\n");
return false;
}
if ((ifd = open(filename, O_RDONLY)) < 0)
pfatal("can't open file %s", filename);
i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
if (i_womp == MAP_FAILED) {
perror("mmap failed");
i_womp = NULL;
close(ifd);
return false;
}
close(ifd);
if (i_size)
madvise(i_womp, i_size, MADV_SEQUENTIAL);
/* estimate the number of lines */
lines_allocated = i_size / 25;
if (lines_allocated < 100)
lines_allocated = 100;
if (!reallocate_lines(&lines_allocated))
return false;
/* now scan the buffer and build pointer array */
iline = 1;
i_ptr[iline] = i_womp;
/* test for NUL too, to maintain the behavior of the original code */
for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
if (*s == '\n') {
if (iline == lines_allocated) {
if (!reallocate_lines(&lines_allocated))
return false;
}
/* these are NOT NUL terminated */
i_ptr[++iline] = s + 1;
}
}
/* if the last line contains no EOL, append one */
if (i_size > 0 && i_womp[i_size - 1] != '\n') {
last_line_missing_eol = true;
/* fix last line */
sz = s - i_ptr[iline];
p = malloc(sz + 1);
if (p == NULL) {
free(i_ptr);
i_ptr = NULL;
munmap(i_womp, i_size);
i_womp = NULL;
return false;
}
memcpy(p, i_ptr[iline], sz);
p[sz] = '\n';
i_ptr[iline] = p;
/* count the extra line and make it point to some valid mem */
i_ptr[++iline] = empty_line;
} else
last_line_missing_eol = false;
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);
}
return true; /* plan a will work */
}
/* Keep (virtually) nothing in memory. */
static void
plan_b(const char *filename)
{
FILE *ifp;
size_t i = 0, j, maxlen = 1;
char *p;
bool found_revision = (revision == NULL);
using_plan_a = false;
if ((ifp = fopen(filename, "r")) == NULL)
pfatal("can't open file %s", filename);
unlink(TMPINNAME);
if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
pfatal("can't open file %s", TMPINNAME);
while (fgets(buf, buf_len, ifp) != NULL) {
if (revision != NULL && !found_revision && rev_in_string(buf))
found_revision = true;
if ((i = strlen(buf)) > maxlen)
maxlen = i; /* find longest line */
}
last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
if (last_line_missing_eol && maxlen == i)
maxlen++;
if (revision != NULL) {
if (!found_revision) {
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);
}
fseek(ifp, 0L, SEEK_SET); /* rewind file */
lines_per_buf = BUFFERSIZE / maxlen;
tireclen = maxlen;
tibuf[0] = malloc(BUFFERSIZE + 1);
if (tibuf[0] == NULL)
fatal("out of memory\n");
tibuf[1] = malloc(BUFFERSIZE + 1);
if (tibuf[1] == NULL)
fatal("out of memory\n");
for (i = 1;; i++) {
p = tibuf[0] + maxlen * (i % lines_per_buf);
if (i % lines_per_buf == 0) /* new block */
if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
pfatal("can't write temp file");
if (fgets(p, maxlen + 1, ifp) == NULL) {
input_lines = i - 1;
if (i % lines_per_buf != 0)
if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
pfatal("can't write temp file");
break;
}
j = strlen(p);
/* These are '\n' terminated strings, so no need to add a NUL */
if (j == 0 || p[j - 1] != '\n')
p[j] = '\n';
}
fclose(ifp);
close(tifd);
if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
pfatal("can't reopen file %s", TMPINNAME);
}
/*
* Fetch a line from the input file, \n terminated, not necessarily \0.
*/
char *
ifetch(LINENUM line, int whichbuf)
{
if (line < 1 || line > input_lines) {
if (warn_on_invalid_line) {
say("No such line %ld in input file, ignoring\n", line);
warn_on_invalid_line = false;
}
return NULL;
}
if (using_plan_a)
return i_ptr[line];
else {
LINENUM offline = line % lines_per_buf;
LINENUM baseline = line - offline;
if (tiline[0] == baseline)
whichbuf = 0;
else if (tiline[1] == baseline)
whichbuf = 1;
else {
tiline[whichbuf] = baseline;
if (lseek(tifd, (off_t) (baseline / lines_per_buf *
BUFFERSIZE), SEEK_SET) < 0)
pfatal("cannot seek in the temporary input file");
if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
pfatal("error reading tmp file %s", TMPINNAME);
}
return tibuf[whichbuf] + (tireclen * offline);
}
}
/*
* True if the string argument contains the revision number we want.
*/
static bool
rev_in_string(const char *string)
{
const 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;
}

35
commands/patch/inp.h Normal file
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@ -0,0 +1,35 @@
/*
* $OpenBSD: inp.h,v 1.8 2003/08/15 08:00:51 otto Exp $
* $DragonFly: src/usr.bin/patch/inp.h,v 1.1 2004/09/24 18:44:28 joerg Exp $
* $NetBSD: inp.h,v 1.10 2008/09/19 18:33:34 joerg Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* 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.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
void re_input(void);
void scan_input(const char *);
char *ifetch(LINENUM, int);

84
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/*
* $OpenBSD: mkpath.c,v 1.2 2005/06/20 07:14:06 otto Exp $
* $DragonFly: src/usr.bin/patch/mkpath.c,v 1.1 2007/09/29 23:11:10 swildner Exp $
* $NetBSD: mkpath.c,v 1.1 2008/09/19 18:33:34 joerg Exp $
*/
/*
* Copyright (c) 1983, 1992, 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>
__RCSID("$NetBSD: mkpath.c,v 1.1 2008/09/19 18:33:34 joerg Exp $");
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <string.h>
int mkpath(char *);
/* Code taken directly from mkdir(1).
* mkpath -- create directories.
* path - path
*/
int
mkpath(char *path)
{
struct stat sb;
char *slash;
int done = 0;
slash = path;
while (!done) {
slash += strspn(slash, "/");
slash += strcspn(slash, "/");
done = (*slash == '\0');
*slash = '\0';
if (stat(path, &sb)) {
if (errno != ENOENT || (mkdir(path, 0777) &&
errno != EEXIST)) {
warn("%s", path);
return (-1);
}
} else if (!S_ISDIR(sb.st_mode)) {
warnx("%s: %s", path, strerror(ENOTDIR));
return (-1);
}
*slash = '/';
}
return (0);
}

700
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@ -0,0 +1,700 @@
.\" $OpenBSD: patch.1,v 1.22 2008/06/06 20:44:00 jmc Exp $
.\" $DragonFly: src/usr.bin/patch/patch.1,v 1.10 2008/08/18 19:15:55 joerg Exp $
.\" $NetBSD: patch.1,v 1.13 2008/09/19 18:33:34 joerg Exp $
.\" 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.
.\"
.Dd August 18, 2008
.Dt PATCH 1
.Os
.Sh NAME
.Nm patch
.Nd apply a diff file to an original
.Sh SYNOPSIS
.Nm
.Bk -words
.Op Fl bCcEeflNnRstuv
.Op Fl B Ar backup-prefix
.Op Fl D Ar symbol
.Op Fl d Ar directory
.Op Fl F Ar max-fuzz
.Op Fl i Ar patchfile
.Op Fl o Ar out-file
.Op Fl p Ar strip-count
.Op Fl r Ar rej-name
.Op Fl V Cm t | nil | never
.Op Fl x Ar number
.Op Fl z Ar backup-ext
.Op Fl Fl posix
.Op Ar origfile Op Ar patchfile
.Ek
.Nm
.Pf \*(Lt Ar patchfile
.Sh DESCRIPTION
.Nm
will take a patch file containing any of the four forms of difference
listing produced by the
.Xr diff 1
program and apply those differences to an original file,
producing a patched version.
If
.Ar patchfile
is omitted, or is a hyphen, the patch will be read from the standard input.
.Pp
.Nm
will attempt to determine the type of the diff listing, unless over-ruled by a
.Fl c ,
.Fl e ,
.Fl n ,
or
.Fl u
option.
Context diffs (old-style, new-style, and unified) and
normal diffs are applied directly by the
.Nm
program itself, whereas ed diffs are simply fed to the
.Xr ed 1
editor via a pipe.
.Pp
If the
.Ar patchfile
contains more than one patch,
.Nm
will try to apply each of them as if they came from separate patch files.
This means, among other things, that it is assumed that the name of the file
to patch must be determined for each diff listing, and that the garbage before
each diff listing will be examined for interesting things such as file names
and revision level (see the section on
.Sx Filename Determination
below).
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Xo
.Fl B Ar backup-prefix ,
.Fl Fl prefix Ar backup-prefix
.Xc
Causes the next argument to be interpreted as a prefix to the backup file
name.
If this argument is specified, any argument to
.Fl z
will be ignored.
.It Fl b , Fl Fl backup
Save a backup copy of the file before it is modified.
By default the original file is saved with a backup extension of
.Qq .orig
unless the file already has a numbered backup, in which case a numbered
backup is made.
This is equivalent to specifying
.Qo Fl V Cm existing Qc .
This option is currently the default, unless
.Fl -posix
is specified.
.It Fl C , Fl Fl check
Checks that the patch would apply cleanly, but does not modify anything.
.It Fl c , Fl Fl context
Forces
.Nm
to interpret the patch file as a context diff.
.It Xo
.Fl D Ar symbol ,
.Fl Fl ifdef Ar symbol
.Xc
Causes
.Nm
to use the
.Qq #ifdef...#endif
construct to mark changes.
The argument following will be used as the differentiating symbol.
Note that, unlike the C compiler, there must be a space between the
.Fl D
and the argument.
.It Xo
.Fl d Ar directory ,
.Fl Fl directory Ar directory
.Xc
Causes
.Nm
to interpret the next argument as a directory,
and change the working directory to it before doing anything else.
.It Fl E , Fl Fl remove-empty-files
Causes
.Nm
to remove output files that are empty after the patches have been applied.
This option is useful when applying patches that create or remove files.
.It Fl e , Fl Fl ed
Forces
.Nm
to interpret the patch file as an
.Xr ed 1
script.
.It Xo
.Fl F Ar max-fuzz ,
.Fl Fl fuzz Ar max-fuzz
.Xc
Sets the maximum fuzz factor.
This option only applies to context diffs, and causes
.Nm
to ignore up to that many lines in looking for places to install a hunk.
Note that a larger fuzz factor increases the odds of a faulty patch.
The default fuzz factor is 2, and it may not be set to more than
the number of lines of context in the context diff, ordinarily 3.
.It Fl f , Fl Fl force
Forces
.Nm
to assume that the user knows exactly what he or she is doing, and to not
ask any questions.
It assumes the following:
skip patches for which a file to patch can't be found;
patch files even though they have the wrong version for the
.Qq Prereq:
line in the patch;
and assume that patches are not reversed even if they look like they are.
This option does not suppress commentary; use
.Fl s
for that.
.It Xo
.Fl i Ar patchfile ,
.Fl Fl input Ar patchfile
.Xc
Causes the next argument to be interpreted as the input file name
(i.e. a patchfile).
This option may be specified multiple times.
.It Fl l , Fl Fl ignore-whitespace
Causes the pattern matching to be done loosely, in case the tabs and
spaces have been munged in your input file.
Any sequence of whitespace in the pattern line will match any sequence
in the input file.
Normal characters must still match exactly.
Each line of the context must still match a line in the input file.
.It Fl N , Fl Fl forward
Causes
.Nm
to ignore patches that it thinks are reversed or already applied.
See also
.Fl R .
.It Fl n , Fl Fl normal
Forces
.Nm
to interpret the patch file as a normal diff.
.It Xo
.Fl o Ar out-file ,
.Fl Fl output Ar out-file
.Xc
Causes the next argument to be interpreted as the output file name.
.It Xo
.Fl p Ar strip-count ,
.Fl Fl strip Ar strip-count
.Xc
Sets the pathname strip count,
which controls how pathnames found in the patch file are treated,
in case you keep your files in a different directory than the person who sent
out the patch.
The strip count specifies how many slashes are to be stripped from
the front of the pathname.
(Any intervening directory names also go away.)
For example, supposing the file name in the patch file was
.Pa /u/howard/src/blurfl/blurfl.c :
.Pp
Setting
.Fl p Ns Ar 0
gives the entire pathname unmodified.
.Pp
.Fl p Ns Ar 1
gives
.Pp
.D1 Pa u/howard/src/blurfl/blurfl.c
.Pp
without the leading slash.
.Pp
.Fl p Ns Ar 4
gives
.Pp
.D1 Pa blurfl/blurfl.c
.Pp
Not specifying
.Fl p
at all just gives you
.Pa blurfl.c ,
unless all of the directories in the leading path
.Pq Pa u/howard/src/blurfl
exist and that path is relative,
in which case you get the entire pathname unmodified.
Whatever you end up with is looked for either in the current directory,
or the directory specified by the
.Fl d
option.
.It Fl R , Fl Fl reverse
Tells
.Nm
that this patch was created with the old and new files swapped.
(Yes, I'm afraid that does happen occasionally, human nature being what it
is.)
.Nm
will attempt to swap each hunk around before applying it.
Rejects will come out in the swapped format.
The
.Fl R
option will not work with ed diff scripts because there is too little
information to reconstruct the reverse operation.
.Pp
If the first hunk of a patch fails,
.Nm
will reverse the hunk to see if it can be applied that way.
If it can, you will be asked if you want to have the
.Fl R
option set.
If it can't, the patch will continue to be applied normally.
(Note: this method cannot detect a reversed patch if it is a normal diff
and if the first command is an append (i.e. it should have been a delete)
since appends always succeed, due to the fact that a null context will match
anywhere.
Luckily, most patches add or change lines rather than delete them, so most
reversed normal diffs will begin with a delete, which will fail, triggering
the heuristic.)
.It Xo
.Fl r Ar rej-name ,
.Fl Fl reject-file Ar rej-name
.Xc
Causes the next argument to be interpreted as the reject file name.
.It Xo
.Fl s , Fl Fl quiet ,
.Fl Fl silent
.Xc
Makes
.Nm
do its work silently, unless an error occurs.
.It Fl t , Fl Fl batch
Similar to
.Fl f ,
in that it suppresses questions, but makes some different assumptions:
skip patches for which a file to patch can't be found (the same as
.Fl f ) ;
skip patches for which the file has the wrong version for the
.Qq Prereq:
line in the patch;
and assume that patches are reversed if they look like they are.
.It Fl u , Fl Fl unified
Forces
.Nm
to interpret the patch file as a unified context diff (a unidiff).
.It Xo
.Fl V Cm t | nil | never ,
.Fl Fl version-control Cm t | nil | never
.Xc
Causes the next argument to be interpreted as a method for creating
backup file names.
The type of backups made can also be given in the
.Ev PATCH_VERSION_CONTROL
or
.Ev VERSION_CONTROL
environment variables, which are overridden by this option.
The
.Fl B
option overrides this option, causing the prefix to always be used for
making backup file names.
The values of the
.Ev PATCH_VERSION_CONTROL
and
.Ev VERSION_CONTROL
environment variables and the argument to the
.Fl V
option are like the GNU Emacs
.Dq version-control
variable; they also recognize synonyms that are more descriptive.
The valid values are (unique abbreviations are accepted):
.Bl -tag -width Ds -offset indent
.It Cm t , numbered
Always make numbered backups.
.It Cm nil , existing
Make numbered backups of files that already have them,
simple backups of the others.
.It Cm never , simple
Always make simple backups.
.El
.It Fl v , Fl Fl version
Causes
.Nm
to print out its revision header and patch level.
.It Xo
.Fl x Ar number ,
.Fl Fl debug Ar number
.Xc
Sets internal debugging flags, and is of interest only to
.Nm
patchers.
.It Xo
.Fl z Ar backup-ext ,
.Fl Fl suffix Ar backup-ext
.Xc
Causes the next argument to be interpreted as the backup extension, to be
used in place of
.Qq .orig .
.It Fl Fl posix
Enables strict
.St -p1003.1-2004
conformance, specifically:
.Bl -enum
.It
Backup files are not created unless the
.Fl b
option is specified.
.It
If unspecified, the file name used is the first of the old, new and
index files that exists.
.El
.El
.Ss Patch Application
.Nm
will try to skip any leading garbage, apply the diff,
and then skip any trailing garbage.
Thus you could feed an article or message containing a
diff listing to
.Nm ,
and it should work.
If the entire diff is indented by a consistent amount,
this will be taken into account.
.Pp
With context diffs, and to a lesser extent with normal diffs,
.Nm
can detect when the line numbers mentioned in the patch are incorrect,
and will attempt to find the correct place to apply each hunk of the patch.
As a first guess, it takes the line number mentioned for the hunk, plus or
minus any offset used in applying the previous hunk.
If that is not the correct place,
.Nm
will scan both forwards and backwards for a set of lines matching the context
given in the hunk.
First
.Nm
looks for a place where all lines of the context match.
If no such place is found, and it's a context diff, and the maximum fuzz factor
is set to 1 or more, then another scan takes place ignoring the first and last
line of context.
If that fails, and the maximum fuzz factor is set to 2 or more,
the first two and last two lines of context are ignored,
and another scan is made.
.Pq The default maximum fuzz factor is 2.
.Pp
If
.Nm
cannot find a place to install that hunk of the patch, it will put the hunk
out to a reject file, which normally is the name of the output file plus
.Qq .rej .
(Note that the rejected hunk will come out in context diff form whether the
input patch was a context diff or a normal diff.
If the input was a normal diff, many of the contexts will simply be null.)
The line numbers on the hunks in the reject file may be different than
in the patch file: they reflect the approximate location patch thinks the
failed hunks belong in the new file rather than the old one.
.Pp
As each hunk is completed, you will be told whether the hunk succeeded or
failed, and which line (in the new file)
.Nm
thought the hunk should go on.
If this is different from the line number specified in the diff,
you will be told the offset.
A single large offset MAY be an indication that a hunk was installed in the
wrong place.
You will also be told if a fuzz factor was used to make the match, in which
case you should also be slightly suspicious.
.Ss Filename Determination
If no original file is specified on the command line,
.Nm
will try to figure out from the leading garbage what the name of the file
to edit is.
When checking a prospective file name, pathname components are stripped
as specified by the
.Fl p
option and the file's existence and writability are checked relative
to the current working directory (or the directory specified by the
.Fl d
option).
.Pp
If the diff is a context or unified diff,
.Nm
is able to determine the old and new file names from the diff header.
For context diffs, the
.Dq old
file is specified in the line beginning with
.Qq ***
and the
.Dq new
file is specified in the line beginning with
.Qq --- .
For a unified diff, the
.Dq old
file is specified in the line beginning with
.Qq ---
and the
.Dq new
file is specified in the line beginning with
.Qq +++ .
If there is an
.Qq Index:
line in the leading garbage (regardless of the diff type),
.Nm
will use the file name from that line as the
.Dq index
file.
.Pp
.Nm
will choose the file name by performing the following steps, with the first
match used:
.Bl -enum
.It
If
.Nm
is operating in strict
.St -p1003.1-2004
mode, the first of the
.Dq old ,
.Dq new
and
.Dq index
file names that exist is used.
Otherwise,
.Nm
will examine either the
.Dq old
and
.Dq new
file names or, for a non-context diff, the
.Dq index
file name, and choose the file name with the fewest path components,
the shortest basename, and the shortest total file name length (in that order).
.It
If no file exists,
.Nm
checks for the existence of the files in an SCCS or RCS directory
(using the appropriate prefix or suffix) using the criteria specified
above.
If found,
.Nm
will attempt to get or check out the file.
.It
If no suitable file was found to patch, the patch file is a context or
unified diff, and the old file was zero length, the new file name is
created and used.
.It
If the file name still cannot be determined,
.Nm
will prompt the user for the file name to use.
.El
.Pp
Additionally, if the leading garbage contains a
.Qq Prereq:\ \&
line,
.Nm
will take the first word from the prerequisites line (normally a version
number) and check the input file to see if that word can be found.
If not,
.Nm
will ask for confirmation before proceeding.
.Pp
The upshot of all this is that you should be able to say, while in a news
interface, the following:
.Pp
.Dl | patch -d /usr/src/local/blurfl
.Pp
and patch a file in the blurfl directory directly from the article containing
the patch.
.Ss Backup Files
By default, the patched version is put in place of the original, with
the original file backed up to the same name with the extension
.Qq .orig ,
or as specified by the
.Fl B ,
.Fl V ,
or
.Fl z
options.
The extension used for making backup files may also be specified in the
.Ev SIMPLE_BACKUP_SUFFIX
environment variable, which is overridden by the options above.
.Pp
If the backup file is a symbolic or hard link to the original file,
.Nm
creates a new backup file name by changing the first lowercase letter
in the last component of the file's name into uppercase.
If there are no more lowercase letters in the name,
it removes the first character from the name.
It repeats this process until it comes up with a
backup file that does not already exist or is not linked to the original file.
.Pp
You may also specify where you want the output to go with the
.Fl o
option; if that file already exists, it is backed up first.
.Ss Notes For Patch Senders
There are several things you should bear in mind if you are going to
be sending out patches:
.Pp
First, you can save people a lot of grief by keeping a
.Pa patchlevel.h
file which is patched to increment the patch level as the first diff in the
patch file you send out.
If you put a
.Qq Prereq:
line in with the patch, it won't let them apply
patches out of order without some warning.
.Pp
Second, make sure you've specified the file names right, either in a
context diff header, or with an
.Qq Index:
line.
If you are patching something in a subdirectory, be sure to tell the patch
user to specify a
.Fl p
option as needed.
.Pp
Third, you can create a file by sending out a diff that compares a
null file to the file you want to create.
This will only work if the file you want to create doesn't exist already in
the target directory.
.Pp
Fourth, take care not to send out reversed patches, since it makes people wonder
whether they already applied the patch.
.Pp
Fifth, while you may be able to get away with putting 582 diff listings into
one file, it is probably wiser to group related patches into separate files in
case something goes haywire.
.Sh ENVIRONMENT
.Bl -tag -width "PATCH_VERSION_CONTROL" -compact
.It Ev POSIXLY_CORRECT
When set,
.Nm
behaves as if the
.Fl Fl posix
option has been specified.
.It Ev SIMPLE_BACKUP_SUFFIX
Extension to use for backup file names instead of
.Qq .orig .
.It Ev TMPDIR
Directory to put temporary files in; default is
.Pa /tmp .
.It Ev PATCH_VERSION_CONTROL
Selects when numbered backup files are made.
.It Ev VERSION_CONTROL
Same as
.Ev PATCH_VERSION_CONTROL .
.El
.Sh FILES
.Bl -tag -width "$TMPDIR/patch*" -compact
.It Pa $TMPDIR/patch*
.Nm
temporary files
.It Pa /dev/tty
used to read input when
.Nm
prompts the user
.El
.Sh DIAGNOSTICS
Too many to list here, but generally indicative that
.Nm
couldn't parse your patch file.
.Pp
The message
.Qq Hmm...
indicates that there is unprocessed text in the patch file and that
.Nm
is attempting to intuit whether there is a patch in that text and, if so,
what kind of patch it is.
.Pp
The
.Nm
utility exits with one of the following values:
.Pp
.Bl -tag -width Ds -compact -offset indent
.It \&0
Successful completion.
.It \&1
One or more lines were written to a reject file.
.It \*[Gt]\&1
An error occurred.
.El
.Pp
When applying a set of patches in a loop it behooves you to check this
exit status so you don't apply a later patch to a partially patched file.
.Sh SEE ALSO
.Xr diff 1
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2004
specification
(except as detailed above for the
.Fl -posix
option),
though the presence of
.Nm
itself is optional.
.Pp
The flags
.Op Fl CEfstuvBFVxz
and
.Op Fl -posix
are extensions to that specification.
.Sh AUTHORS
.An Larry Wall
with many other contributors.
.Sh CAVEATS
.Nm
cannot tell if the line numbers are off in an ed script, and can only detect
bad line numbers in a normal diff when it finds a
.Qq change
or a
.Qq delete
command.
A context diff using fuzz factor 3 may have the same problem.
Until a suitable interactive interface is added, you should probably do
a context diff in these cases to see if the changes made sense.
Of course, compiling without errors is a pretty good indication that the patch
worked, but not always.
.Pp
.Nm
usually produces the correct results, even when it has to do a lot of
guessing.
However, the results are guaranteed to be correct only when the patch is
applied to exactly the same version of the file that the patch was
generated from.
.Sh BUGS
Could be smarter about partial matches, excessively deviant offsets and
swapped code, but that would take an extra pass.
.Pp
Check patch mode
.Pq Fl C
will fail if you try to check several patches in succession that build on
each other.
The entire
.Nm
code would have to be restructured to keep temporary files around so that it
can handle this situation.
.Pp
If code has been duplicated (for instance with #ifdef OLDCODE ... #else ...
#endif),
.Nm
is incapable of patching both versions, and, if it works at all, will likely
patch the wrong one, and tell you that it succeeded to boot.
.Pp
If you apply a patch you've already applied,
.Nm
will think it is a reversed patch, and offer to un-apply the patch.
This could be construed as a feature.

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/*
* $OpenBSD: pathnames.h,v 1.1 2003/07/29 20:10:17 millert Exp $
* $DragonFly: src/usr.bin/patch/pathnames.h,v 1.2 2008/08/11 00:04:12 joerg Exp $
* $NetBSD: pathnames.h,v 1.1 2008/09/19 18:33:34 joerg Exp $
*/
/*
* Placed in the public domain by Todd C. Miller <Todd.Miller@courtesan.com>
* on July 29, 2003.
*/
#include <paths.h>
#define _PATH_ED "/bin/ed"

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commands/patch/pch.h Normal file
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/*
* $OpenBSD: pch.h,v 1.9 2003/10/31 20:20:45 millert Exp $
* $DragonFly: src/usr.bin/patch/pch.h,v 1.1 2004/09/24 18:44:28 joerg Exp $
* $NetBSD: pch.h,v 1.10 2008/09/19 18:33:34 joerg Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* 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.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
#define OLD_FILE 0
#define NEW_FILE 1
#define INDEX_FILE 2
#define MAX_FILE 3
struct file_name {
char *path;
bool exists;
};
void re_patch(void);
void open_patch_file(const char *);
void set_hunkmax(void);
bool there_is_another_patch(void);
bool another_hunk(void);
bool pch_swap(void);
char *pfetch(LINENUM);
short pch_line_len(LINENUM);
LINENUM pch_first(void);
LINENUM pch_ptrn_lines(void);
LINENUM pch_newfirst(void);
LINENUM pch_repl_lines(void);
LINENUM pch_end(void);
LINENUM pch_context(void);
LINENUM pch_hunk_beg(void);
char pch_char(LINENUM);
void do_ed_script(void);

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/*
* $OpenBSD: util.c,v 1.32 2006/03/11 19:41:30 otto Exp $
* $DragonFly: src/usr.bin/patch/util.c,v 1.9 2007/09/29 23:11:10 swildner Exp $
* $NetBSD: util.c,v 1.24 2008/09/19 18:33:34 joerg Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* 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.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: util.c,v 1.24 2008/09/19 18:33:34 joerg Exp $");
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <paths.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "util.h"
#include "backupfile.h"
#include "pathnames.h"
/* Rename a file, copying it if necessary. */
int
move_file(const char *from, const char *to)
{
int fromfd;
ssize_t i;
/* to stdout? */
if (strEQ(to, "-")) {
#ifdef DEBUGGING
if (debug & 4)
say("Moving %s to stdout.\n", from);
#endif
fromfd = open(from, O_RDONLY);
if (fromfd < 0)
pfatal("internal error, can't reopen %s", from);
while ((i = read(fromfd, buf, buf_len)) > 0)
if (write(STDOUT_FILENO, buf, i) != i)
pfatal("write failed");
close(fromfd);
return 0;
}
if (backup_file(to) < 0) {
say("Can't backup %s, output is in %s: %s\n", to, from,
strerror(errno));
return -1;
}
#ifdef DEBUGGING
if (debug & 4)
say("Moving %s to %s.\n", from, to);
#endif
if (rename(from, to) < 0) {
if (errno != EXDEV || copy_file(from, to) < 0) {
say("Can't create %s, output is in %s: %s\n",
to, from, strerror(errno));
return -1;
}
}
return 0;
}
/* Backup the original file. */
int
backup_file(const char *orig)
{
struct stat filestat;
char bakname[MAXPATHLEN], *s, *simplename;
dev_t orig_device;
ino_t orig_inode;
if (backup_type == none || stat(orig, &filestat) != 0)
return 0; /* nothing to do */
/*
* If the user used zero prefixes or suffixes, then
* he doesn't want backups. Yet we have to remove
* orig to break possible hardlinks.
*/
if ((origprae && *origprae == 0) || *simple_backup_suffix == 0) {
unlink(orig);
return 0;
}
orig_device = filestat.st_dev;
orig_inode = filestat.st_ino;
if (origprae) {
if (strlcpy(bakname, origprae, sizeof(bakname)) >= sizeof(bakname) ||
strlcat(bakname, orig, sizeof(bakname)) >= sizeof(bakname))
fatal("filename %s too long for buffer\n", origprae);
} else {
if ((s = find_backup_file_name(orig)) == NULL)
fatal("out of memory\n");
if (strlcpy(bakname, s, sizeof(bakname)) >= sizeof(bakname))
fatal("filename %s too long for buffer\n", s);
free(s);
}
if ((simplename = strrchr(bakname, '/')) != NULL)
simplename = simplename + 1;
else
simplename = bakname;
/*
* Find a backup name that is not the same file. Change the
* first lowercase char into uppercase; if that isn't
* sufficient, chop off the first char and try again.
*/
while (stat(bakname, &filestat) == 0 &&
orig_device == filestat.st_dev && orig_inode == filestat.st_ino) {
/* Skip initial non-lowercase chars. */
for (s = simplename; *s && !islower((unsigned char)*s); s++)
;
if (*s)
*s = toupper((unsigned char)*s);
else
memmove(simplename, simplename + 1,
strlen(simplename + 1) + 1);
}
#ifdef DEBUGGING
if (debug & 4)
say("Moving %s to %s.\n", orig, bakname);
#endif
if (rename(orig, bakname) < 0) {
if (errno != EXDEV || copy_file(orig, bakname) < 0)
return -1;
}
return 0;
}
/*
* Copy a file.
*/
int
copy_file(const char *from, const char *to)
{
int tofd, fromfd;
ssize_t i;
tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666);
if (tofd < 0)
return -1;
fromfd = open(from, O_RDONLY, 0);
if (fromfd < 0)
pfatal("internal error, can't reopen %s", from);
while ((i = read(fromfd, buf, buf_len)) > 0)
if (write(tofd, buf, i) != i)
pfatal("write to %s failed", to);
close(fromfd);
close(tofd);
return 0;
}
/*
* Allocate a unique area for a string.
*/
char *
savestr(const char *s)
{
char *rv;
if (!s)
s = "Oops";
rv = strdup(s);
if (rv == NULL) {
if (using_plan_a)
out_of_mem = true;
else
fatal("out of memory\n");
}
return rv;
}
/*
* Vanilla terminal output (buffered).
*/
void
say(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fflush(stderr);
}
/*
* Terminal output, pun intended.
*/
void
fatal(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "patch: **** ");
vfprintf(stderr, fmt, ap);
va_end(ap);
my_exit(2);
}
/*
* Say something from patch, something from the system, then silence . . .
*/
void
pfatal(const char *fmt, ...)
{
va_list ap;
int errnum = errno;
fprintf(stderr, "patch: **** ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, ": %s\n", strerror(errnum));
my_exit(2);
}
/*
* Get a response from the user via /dev/tty
*/
void
ask(const char *fmt, ...)
{
va_list ap;
ssize_t nr = 0;
static int ttyfd = -1;
va_start(ap, fmt);
vfprintf(stdout, fmt, ap);
va_end(ap);
fflush(stdout);
if (ttyfd < 0)
ttyfd = open(_PATH_TTY, O_RDONLY);
if (ttyfd >= 0) {
if ((nr = read(ttyfd, buf, buf_len)) > 0 &&
buf[nr - 1] == '\n')
buf[nr - 1] = '\0';
}
if (ttyfd < 0 || nr <= 0) {
/* no tty or error reading, pretend user entered 'return' */
putchar('\n');
buf[0] = '\0';
}
}
/*
* How to handle certain events when not in a critical region.
*/
void
set_signals(int reset)
{
static sig_t hupval, intval;
if (!reset) {
hupval = signal(SIGHUP, SIG_IGN);
if (hupval != SIG_IGN)
hupval = my_exit;
intval = signal(SIGINT, SIG_IGN);
if (intval != SIG_IGN)
intval = my_exit;
}
signal(SIGHUP, hupval);
signal(SIGINT, intval);
}
/*
* How to handle certain events when in a critical region.
*/
void
ignore_signals(void)
{
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
}
/*
* Make sure we'll have the directories to create a file. If `striplast' is
* true, ignore the last element of `filename'.
*/
void
makedirs(const char *filename, bool striplast)
{
char *tmpbuf;
if ((tmpbuf = strdup(filename)) == NULL)
fatal("out of memory\n");
if (striplast) {
char *s = strrchr(tmpbuf, '/');
if (s == NULL)
return; /* nothing to be done */
*s = '\0';
}
if (mkpath(tmpbuf) != 0)
pfatal("creation of %s failed", tmpbuf);
free(tmpbuf);
}
/*
* Make filenames more reasonable.
*/
char *
fetchname(const char *at, bool *exists, int strip_leading)
{
char *fullname, *name, *t;
int sleading, tab;
struct stat filestat;
if (at == NULL || *at == '\0')
return NULL;
while (isspace((unsigned char)*at))
at++;
#ifdef DEBUGGING
if (debug & 128)
say("fetchname %s %d\n", at, strip_leading);
#endif
/* So files can be created by diffing against /dev/null. */
if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
return NULL;
name = fullname = t = savestr(at);
tab = strchr(t, '\t') != NULL;
/* Strip off up to `strip_leading' path components and NUL terminate. */
for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') ||
!isspace((unsigned char)*t)); t++) {
if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
if (--sleading >= 0)
name = t + 1;
}
*t = '\0';
/*
* If no -p option was given (957 is the default value!), we were
* given a relative pathname, and the leading directories that we
* just stripped off all exist, put them back on.
*/
if (strip_leading == 957 && name != fullname && *fullname != '/') {
name[-1] = '\0';
if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) {
name[-1] = '/';
name = fullname;
}
}
name = savestr(name);
free(fullname);
*exists = stat(name, &filestat) == 0;
return name;
}
/*
* Takes the name returned by fetchname and looks in RCS/SCCS directories
* for a checked in version.
*/
char *
checked_in(char *file)
{
char *filebase, *filedir, tmpbuf[MAXPATHLEN];
struct stat filestat;
filebase = basename(file);
filedir = dirname(file);
#define try(f, a1, a2, a3) \
(snprintf(tmpbuf, sizeof tmpbuf, f, a1, a2, a3), stat(tmpbuf, &filestat) == 0)
if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
try("%s/RCS/%s%s", filedir, filebase, "") ||
try("%s/%s%s", filedir, filebase, RCSSUFFIX) ||
try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
try("%s/%s%s", filedir, SCCSPREFIX, filebase))
return file;
return NULL;
}
void
version(void)
{
fprintf(stderr, "Patch version 2.0-12u8-NetBSD\n");
my_exit(EXIT_SUCCESS);
}
/*
* Exit with cleanup.
*/
void
my_exit(int status)
{
unlink(TMPINNAME);
if (!toutkeep)
unlink(TMPOUTNAME);
if (!trejkeep)
unlink(TMPREJNAME);
unlink(TMPPATNAME);
exit(status);
}

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/*
* $OpenBSD: util.h,v 1.15 2005/06/20 07:14:06 otto Exp $
* $DragonFly: src/usr.bin/patch/util.h,v 1.2 2007/09/29 23:11:10 swildner Exp $
* $NetBSD: util.h,v 1.11 2008/09/19 18:33:34 joerg Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* 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.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
char *fetchname(const char *, bool *, int);
char *checked_in(char *);
int backup_file(const char *);
int move_file(const char *, const char *);
int copy_file(const char *, const char *);
void say(const char *, ...)
__attribute__((__format__(__printf__, 1, 2)));
void fatal(const char *, ...)
__attribute__((__format__(__printf__, 1, 2)));
void pfatal(const char *, ...)
__attribute__((__format__(__printf__, 1, 2)));
void ask(const char *, ...)
__attribute__((__format__(__printf__, 1, 2)));
char *savestr(const char *);
void set_signals(int);
void ignore_signals(void);
void makedirs(const char *, bool);
void version(void);
void my_exit(int) __attribute__((noreturn));
/* in mkpath.c */
extern int mkpath(char *);