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freebsd-nq/usr.bin/patch/pch.c
Kyle Evans 50dacbf6c2 patch(1): give /dev/null patches special treatment 
We have a bad habit of duplicating contents of files that are sourced from
/dev/null and applied more than once... take the more sane (in most ways)
GNU route and complain if the file exists and offer reversal options.

This still falls short a little bit as selecting "don't reverse, apply
anyway" will still give you duplicated file contents. There's probably other
issues as well, but awareness is the first step to happiness.

MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D21535
2019-11-04 03:07:01 +00:00

1665 lines
41 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: pch.c,v 1.43 2014/11/18 17:03:35 tobias Exp $
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <libgen.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "util.h"
#include "pch.h"
#include "pathnames.h"
/* Patch (diff listing) abstract type. */
static off_t p_filesize; /* size of the patch file */
static LINENUM p_first; /* 1st line number */
static LINENUM p_newfirst; /* 1st line number of replacement */
static LINENUM p_ptrn_lines; /* # lines in pattern */
static LINENUM p_repl_lines; /* # lines in replacement text */
static LINENUM p_end = -1; /* last line in hunk */
static LINENUM p_max; /* max allowed value of p_end */
static LINENUM p_context = 3; /* # of context lines */
static LINENUM p_input_line = 0; /* current line # from patch file */
static char **p_line = NULL;/* the text of the hunk */
static unsigned short *p_len = NULL; /* length of each line */
static char *p_char = NULL; /* +, -, and ! */
static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */
static int p_indent; /* indent to patch */
static off_t p_base; /* where to intuit this time */
static LINENUM p_bline; /* line # of p_base */
static off_t p_start; /* where intuit found a patch */
static LINENUM p_sline; /* and the line number for it */
static LINENUM p_hunk_beg; /* line number of current hunk */
static LINENUM p_efake = -1; /* end of faked up lines--don't free */
static LINENUM p_bfake = -1; /* beg of faked up lines */
static FILE *pfp = NULL; /* patch file pointer */
static char *bestguess = NULL; /* guess at correct filename */
char *source_file;
static void grow_hunkmax(void);
static int intuit_diff_type(void);
static void next_intuit_at(off_t, LINENUM);
static void skip_to(off_t, LINENUM);
static size_t pgets(bool _do_indent);
static char *best_name(const struct file_name *, bool);
static char *posix_name(const struct file_name *, bool);
static size_t num_components(const char *);
static LINENUM strtolinenum(char *, char **);
/*
* Prepare to look for the next patch in the patch file.
*/
void
re_patch(void)
{
p_first = 0;
p_newfirst = 0;
p_ptrn_lines = 0;
p_repl_lines = 0;
p_end = (LINENUM) - 1;
p_max = 0;
p_indent = 0;
}
/*
* Open the patch file at the beginning of time.
*/
void
open_patch_file(const char *filename)
{
struct stat filestat;
int nr, nw;
if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) {
pfp = fopen(TMPPATNAME, "w");
if (pfp == NULL)
pfatal("can't create %s", TMPPATNAME);
while ((nr = fread(buf, 1, buf_size, stdin)) > 0) {
nw = fwrite(buf, 1, nr, pfp);
if (nr != nw)
pfatal("write error to %s", TMPPATNAME);
}
if (ferror(pfp) || fclose(pfp))
pfatal("can't write %s", TMPPATNAME);
filename = TMPPATNAME;
}
pfp = fopen(filename, "r");
if (pfp == NULL)
pfatal("patch file %s not found", filename);
if (fstat(fileno(pfp), &filestat))
pfatal("can't stat %s", filename);
p_filesize = filestat.st_size;
next_intuit_at(0, 1L); /* start at the beginning */
set_hunkmax();
}
/*
* Make sure our dynamically realloced tables are malloced to begin with.
*/
void
set_hunkmax(void)
{
if (p_line == NULL)
p_line = malloc(hunkmax * sizeof(char *));
if (p_len == NULL)
p_len = malloc(hunkmax * sizeof(unsigned short));
if (p_char == NULL)
p_char = malloc(hunkmax * sizeof(char));
}
/*
* Enlarge the arrays containing the current hunk of patch.
*/
static void
grow_hunkmax(void)
{
int new_hunkmax = hunkmax * 2;
if (p_line == NULL || p_len == NULL || p_char == NULL)
fatal("Internal memory allocation error\n");
p_line = reallocf(p_line, new_hunkmax * sizeof(char *));
p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short));
p_char = reallocf(p_char, new_hunkmax * sizeof(char));
if (p_line != NULL && p_len != NULL && p_char != NULL) {
hunkmax = new_hunkmax;
return;
}
if (!using_plan_a)
fatal("out of memory\n");
out_of_mem = true; /* whatever is null will be allocated again */
/* from within plan_a(), of all places */
}
/* True if the remainder of the patch file contains a diff of some sort. */
bool
there_is_another_patch(void)
{
bool exists = false;
if (p_base != 0 && p_base >= p_filesize) {
if (verbose)
say("done\n");
return false;
}
if (p_filesize == 0)
return false;
nonempty_patchf_seen = true;
if (verbose)
say("Hmm...");
diff_type = intuit_diff_type();
if (!diff_type) {
if (p_base != 0) {
if (verbose)
say(" Ignoring the trailing garbage.\ndone\n");
} else
say(" I can't seem to find a patch in there anywhere.\n");
return false;
}
if (verbose)
say(" %sooks like %s to me...\n",
(p_base == 0 ? "L" : "The next patch l"),
diff_type == UNI_DIFF ? "a unified diff" :
diff_type == CONTEXT_DIFF ? "a context diff" :
diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
diff_type == NORMAL_DIFF ? "a normal diff" :
"an ed script");
if (p_indent && verbose)
say("(Patch is indented %d space%s.)\n", p_indent,
p_indent == 1 ? "" : "s");
skip_to(p_start, p_sline);
while (filearg[0] == NULL) {
if (force || batch) {
say("No file to patch. Skipping...\n");
filearg[0] = xstrdup(bestguess);
skip_rest_of_patch = true;
return true;
}
ask("File to patch: ");
if (*buf != '\n') {
free(bestguess);
bestguess = xstrdup(buf);
filearg[0] = fetchname(buf, &exists, 0);
}
/*
* fetchname can now return buf = NULL, exists = true, to
* indicate to the caller that /dev/null was specified. Retain
* previous behavior for now until this can be better evaluted.
*/
if (filearg[0] == NULL || !exists) {
int def_skip = *bestguess == '\0';
ask("No file found--skip this patch? [%c] ",
def_skip ? 'y' : 'n');
if (*buf == 'n' || (!def_skip && *buf != 'y'))
continue;
if (verbose)
say("Skipping patch...\n");
free(filearg[0]);
filearg[0] = fetchname(bestguess, &exists, 0);
skip_rest_of_patch = true;
return true;
}
}
return true;
}
static void
p4_fetchname(struct file_name *name, char *str)
{
char *t, *h;
/* Skip leading whitespace. */
while (isspace((unsigned char)*str))
str++;
/* Remove the file revision number. */
for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++)
if (*t == '#')
h = t;
if (h != NULL)
*h = '\0';
name->path = fetchname(str, &name->exists, strippath);
}
/* Determine what kind of diff is in the remaining part of the patch file. */
static int
intuit_diff_type(void)
{
off_t this_line = 0, previous_line;
off_t first_command_line = -1;
LINENUM fcl_line = -1;
bool last_line_was_command = false, this_is_a_command = false;
bool stars_last_line = false, stars_this_line = false;
char *s, *t;
int indent, retval;
struct file_name names[MAX_FILE];
int piece_of_git = 0;
memset(names, 0, sizeof(names));
ok_to_create_file = false;
fseeko(pfp, p_base, SEEK_SET);
p_input_line = p_bline - 1;
for (;;) {
previous_line = this_line;
last_line_was_command = this_is_a_command;
stars_last_line = stars_this_line;
this_line = ftello(pfp);
indent = 0;
p_input_line++;
if (pgets(false) == 0) {
if (first_command_line >= 0) {
/* nothing but deletes!? */
p_start = first_command_line;
p_sline = fcl_line;
retval = ED_DIFF;
goto scan_exit;
} else {
p_start = this_line;
p_sline = p_input_line;
retval = 0;
goto scan_exit;
}
}
for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
if (*s == '\t')
indent += 8 - (indent % 8);
else
indent++;
}
for (t = s; isdigit((unsigned char)*t) || *t == ','; t++)
;
this_is_a_command = (isdigit((unsigned char)*s) &&
(*t == 'd' || *t == 'c' || *t == 'a'));
if (first_command_line < 0 && this_is_a_command) {
first_command_line = this_line;
fcl_line = p_input_line;
p_indent = indent; /* assume this for now */
}
if (!stars_last_line && strnEQ(s, "*** ", 4))
names[OLD_FILE].path = fetchname(s + 4,
&names[OLD_FILE].exists, strippath);
else if (strnEQ(s, "--- ", 4)) {
size_t off = 4;
if (piece_of_git && strippath == 957 &&
strnEQ(s, "--- a/", 6))
off = 6;
names[NEW_FILE].path = fetchname(s + off,
&names[NEW_FILE].exists, strippath);
} else if (strnEQ(s, "+++ ", 4)) {
/* pretend it is the old name */
size_t off = 4;
if (piece_of_git && strippath == 957 &&
strnEQ(s, "+++ b/", 6))
off = 6;
names[OLD_FILE].path = fetchname(s + off,
&names[OLD_FILE].exists, strippath);
} else if (strnEQ(s, "Index:", 6))
names[INDEX_FILE].path = fetchname(s + 6,
&names[INDEX_FILE].exists, strippath);
else if (strnEQ(s, "Prereq:", 7)) {
for (t = s + 7; isspace((unsigned char)*t); t++)
;
revision = xstrdup(t);
for (t = revision;
*t && !isspace((unsigned char)*t); t++)
;
*t = '\0';
if (*revision == '\0') {
free(revision);
revision = NULL;
}
} else if (strnEQ(s, "diff --git a/", 13)) {
/* Git-style diffs. */
piece_of_git = 1;
} else if (strnEQ(s, "==== ", 5)) {
/* Perforce-style diffs. */
if ((t = strstr(s + 5, " - ")) != NULL)
p4_fetchname(&names[NEW_FILE], t + 3);
p4_fetchname(&names[OLD_FILE], s + 5);
}
if ((!diff_type || diff_type == ED_DIFF) &&
first_command_line >= 0 &&
strEQ(s, ".\n")) {
p_indent = indent;
p_start = first_command_line;
p_sline = fcl_line;
retval = ED_DIFF;
goto scan_exit;
}
if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) {
if (strnEQ(s + 4, "0,0", 3))
ok_to_create_file = true;
p_indent = indent;
p_start = this_line;
p_sline = p_input_line;
retval = UNI_DIFF;
goto scan_exit;
}
stars_this_line = strnEQ(s, "********", 8);
if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
strnEQ(s, "*** ", 4)) {
if (strtolinenum(s + 4, &s) == 0)
ok_to_create_file = true;
/*
* If this is a new context diff the character just
* at the end of the line is a '*'.
*/
while (*s && *s != '\n')
s++;
p_indent = indent;
p_start = previous_line;
p_sline = p_input_line - 1;
retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
goto scan_exit;
}
if ((!diff_type || diff_type == NORMAL_DIFF) &&
last_line_was_command &&
(strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) {
p_start = previous_line;
p_sline = p_input_line - 1;
p_indent = indent;
retval = NORMAL_DIFF;
goto scan_exit;
}
}
scan_exit:
if (retval == UNI_DIFF) {
/* unswap old and new */
struct file_name tmp = names[OLD_FILE];
names[OLD_FILE] = names[NEW_FILE];
names[NEW_FILE] = tmp;
}
/* Invalidated */
free(source_file);
source_file = NULL;
if (retval != 0) {
/*
* If we've successfully determined a diff type, stored in
* retval, path == NULL means _PATH_DEVNULL if exists is set.
* Explicitly specify it here to make it easier to detect later
* on that we're actually creating a file and not that we've
* just goofed something up.
*/
if (names[OLD_FILE].path != NULL)
source_file = xstrdup(names[OLD_FILE].path);
else if (names[OLD_FILE].exists)
source_file = xstrdup(_PATH_DEVNULL);
}
if (filearg[0] == NULL) {
if (posix)
filearg[0] = posix_name(names, ok_to_create_file);
else {
/* Ignore the Index: name for context diffs, like GNU */
if (names[OLD_FILE].path != NULL ||
names[NEW_FILE].path != NULL) {
free(names[INDEX_FILE].path);
names[INDEX_FILE].path = NULL;
}
filearg[0] = best_name(names, ok_to_create_file);
}
}
free(bestguess);
bestguess = NULL;
if (filearg[0] != NULL)
bestguess = xstrdup(filearg[0]);
else if (!ok_to_create_file) {
/*
* We don't want to create a new file but we need a
* filename to set bestguess. Avoid setting filearg[0]
* so the file is not created automatically.
*/
if (posix)
bestguess = posix_name(names, true);
else
bestguess = best_name(names, true);
}
free(names[OLD_FILE].path);
free(names[NEW_FILE].path);
free(names[INDEX_FILE].path);
return retval;
}
/*
* Remember where this patch ends so we know where to start up again.
*/
static void
next_intuit_at(off_t file_pos, LINENUM file_line)
{
p_base = file_pos;
p_bline = file_line;
}
/*
* Basically a verbose fseeko() to the actual diff listing.
*/
static void
skip_to(off_t file_pos, LINENUM file_line)
{
size_t len;
if (p_base > file_pos)
fatal("Internal error: seek %lld>%lld\n",
(long long)p_base, (long long)file_pos);
if (verbose && p_base < file_pos) {
fseeko(pfp, p_base, SEEK_SET);
say("The text leading up to this was:\n--------------------------\n");
while (ftello(pfp) < file_pos) {
len = pgets(false);
if (len == 0)
fatal("Unexpected end of file\n");
say("|%s", buf);
}
say("--------------------------\n");
} else
fseeko(pfp, file_pos, SEEK_SET);
p_input_line = file_line - 1;
}
/* Make this a function for better debugging. */
static void
malformed(void)
{
fatal("malformed patch at line %ld: %s", p_input_line, buf);
/* about as informative as "Syntax error" in C */
}
/*
* True if the line has been discarded (i.e. it is a line saying
* "\ No newline at end of file".)
*/
static bool
remove_special_line(void)
{
int c;
c = fgetc(pfp);
if (c == '\\') {
do {
c = fgetc(pfp);
} while (c != EOF && c != '\n');
return true;
}
if (c != EOF)
fseeko(pfp, -1, SEEK_CUR);
return false;
}
/*
* True if there is more of the current diff listing to process.
*/
bool
another_hunk(void)
{
off_t line_beginning; /* file pos of the current line */
LINENUM repl_beginning; /* index of --- line */
LINENUM fillcnt; /* #lines of missing ptrn or repl */
LINENUM fillsrc; /* index of first line to copy */
LINENUM filldst; /* index of first missing line */
bool ptrn_spaces_eaten; /* ptrn was slightly malformed */
bool repl_could_be_missing; /* no + or ! lines in this hunk */
bool repl_missing; /* we are now backtracking */
off_t repl_backtrack_position; /* file pos of first repl line */
LINENUM repl_patch_line; /* input line number for same */
LINENUM ptrn_copiable; /* # of copiable lines in ptrn */
char *s;
size_t len;
int context = 0;
while (p_end >= 0) {
if (p_end == p_efake)
p_end = p_bfake; /* don't free twice */
else
free(p_line[p_end]);
p_end--;
}
p_efake = -1;
p_max = hunkmax; /* gets reduced when --- found */
if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
line_beginning = ftello(pfp);
repl_beginning = 0;
fillcnt = 0;
fillsrc = 0;
filldst = 0;
ptrn_spaces_eaten = false;
repl_could_be_missing = true;
repl_missing = false;
repl_backtrack_position = 0;
repl_patch_line = 0;
ptrn_copiable = 0;
len = pgets(true);
p_input_line++;
if (len == 0 || strnNE(buf, "********", 8)) {
next_intuit_at(line_beginning, p_input_line);
return false;
}
p_context = 100;
p_hunk_beg = p_input_line + 1;
while (p_end < p_max) {
line_beginning = ftello(pfp);
len = pgets(true);
p_input_line++;
if (len == 0) {
if (p_max - p_end < 4) {
/* assume blank lines got chopped */
strlcpy(buf, " \n", buf_size);
} else {
if (repl_beginning && repl_could_be_missing) {
repl_missing = true;
goto hunk_done;
}
fatal("unexpected end of file in patch\n");
}
}
p_end++;
if (p_end >= hunkmax)
fatal("Internal error: hunk larger than hunk "
"buffer size");
p_char[p_end] = *buf;
p_line[p_end] = NULL;
switch (*buf) {
case '*':
if (strnEQ(buf, "********", 8)) {
if (repl_beginning && repl_could_be_missing) {
repl_missing = true;
goto hunk_done;
} else
fatal("unexpected end of hunk "
"at line %ld\n",
p_input_line);
}
if (p_end != 0) {
if (repl_beginning && repl_could_be_missing) {
repl_missing = true;
goto hunk_done;
}
fatal("unexpected *** at line %ld: %s",
p_input_line, buf);
}
context = 0;
p_line[p_end] = savestr(buf);
if (out_of_mem) {
p_end--;
return false;
}
for (s = buf;
*s && !isdigit((unsigned char)*s); s++)
;
if (!*s)
malformed();
if (strnEQ(s, "0,0", 3))
memmove(s, s + 2, strlen(s + 2) + 1);
p_first = strtolinenum(s, &s);
if (*s == ',') {
for (;
*s && !isdigit((unsigned char)*s); s++)
;
if (!*s)
malformed();
p_ptrn_lines = strtolinenum(s, &s) - p_first + 1;
if (p_ptrn_lines < 0)
malformed();
} else if (p_first)
p_ptrn_lines = 1;
else {
p_ptrn_lines = 0;
p_first = 1;
}
if (p_first >= LINENUM_MAX - p_ptrn_lines ||
p_ptrn_lines >= LINENUM_MAX - 6)
malformed();
/* we need this much at least */
p_max = p_ptrn_lines + 6;
while (p_max >= hunkmax)
grow_hunkmax();
p_max = hunkmax;
break;
case '-':
if (buf[1] == '-') {
if (repl_beginning ||
(p_end != p_ptrn_lines + 1 +
(p_char[p_end - 1] == '\n'))) {
if (p_end == 1) {
/*
* `old' lines were omitted;
* set up to fill them in
* from 'new' context lines.
*/
p_end = p_ptrn_lines + 1;
fillsrc = p_end + 1;
filldst = 1;
fillcnt = p_ptrn_lines;
} else {
if (repl_beginning) {
if (repl_could_be_missing) {
repl_missing = true;
goto hunk_done;
}
fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n",
p_input_line, p_hunk_beg + repl_beginning);
} else {
fatal("%s \"---\" at line %ld--check line numbers at line %ld\n",
(p_end <= p_ptrn_lines
? "Premature"
: "Overdue"),
p_input_line, p_hunk_beg);
}
}
}
repl_beginning = p_end;
repl_backtrack_position = ftello(pfp);
repl_patch_line = p_input_line;
p_line[p_end] = savestr(buf);
if (out_of_mem) {
p_end--;
return false;
}
p_char[p_end] = '=';
for (s = buf; *s && !isdigit((unsigned char)*s); s++)
;
if (!*s)
malformed();
p_newfirst = strtolinenum(s, &s);
if (*s == ',') {
for (; *s && !isdigit((unsigned char)*s); s++)
;
if (!*s)
malformed();
p_repl_lines = strtolinenum(s, &s) -
p_newfirst + 1;
if (p_repl_lines < 0)
malformed();
} else if (p_newfirst)
p_repl_lines = 1;
else {
p_repl_lines = 0;
p_newfirst = 1;
}
if (p_newfirst >= LINENUM_MAX - p_repl_lines ||
p_repl_lines >= LINENUM_MAX - p_end)
malformed();
p_max = p_repl_lines + p_end;
if (p_max > MAXHUNKSIZE)
fatal("hunk too large (%ld lines) at line %ld: %s",
p_max, p_input_line, buf);
while (p_max >= hunkmax)
grow_hunkmax();
if (p_repl_lines != ptrn_copiable &&
(p_context != 0 || p_repl_lines != 1))
repl_could_be_missing = false;
break;
}
goto change_line;
case '+':
case '!':
repl_could_be_missing = false;
change_line:
if (buf[1] == '\n' && canonicalize)
strlcpy(buf + 1, " \n", buf_size - 1);
if (!isspace((unsigned char)buf[1]) &&
buf[1] != '>' && buf[1] != '<' &&
repl_beginning && repl_could_be_missing) {
repl_missing = true;
goto hunk_done;
}
if (context >= 0) {
if (context < p_context)
p_context = context;
context = -1000;
}
p_line[p_end] = savestr(buf + 2);
if (out_of_mem) {
p_end--;
return false;
}
if (p_end == p_ptrn_lines) {
if (remove_special_line()) {
int l;
l = strlen(p_line[p_end]) - 1;
(p_line[p_end])[l] = 0;
}
}
break;
case '\t':
case '\n': /* assume the 2 spaces got eaten */
if (repl_beginning && repl_could_be_missing &&
(!ptrn_spaces_eaten ||
diff_type == NEW_CONTEXT_DIFF)) {
repl_missing = true;
goto hunk_done;
}
p_line[p_end] = savestr(buf);
if (out_of_mem) {
p_end--;
return false;
}
if (p_end != p_ptrn_lines + 1) {
ptrn_spaces_eaten |= (repl_beginning != 0);
context++;
if (!repl_beginning)
ptrn_copiable++;
p_char[p_end] = ' ';
}
break;
case ' ':
if (!isspace((unsigned char)buf[1]) &&
repl_beginning && repl_could_be_missing) {
repl_missing = true;
goto hunk_done;
}
context++;
if (!repl_beginning)
ptrn_copiable++;
p_line[p_end] = savestr(buf + 2);
if (out_of_mem) {
p_end--;
return false;
}
break;
default:
if (repl_beginning && repl_could_be_missing) {
repl_missing = true;
goto hunk_done;
}
malformed();
}
/* set up p_len for strncmp() so we don't have to */
/* assume null termination */
if (p_line[p_end])
p_len[p_end] = strlen(p_line[p_end]);
else
p_len[p_end] = 0;
}
hunk_done:
if (p_end >= 0 && !repl_beginning)
fatal("no --- found in patch at line %ld\n", pch_hunk_beg());
if (repl_missing) {
/* reset state back to just after --- */
p_input_line = repl_patch_line;
for (p_end--; p_end > repl_beginning; p_end--)
free(p_line[p_end]);
fseeko(pfp, repl_backtrack_position, SEEK_SET);
/* redundant 'new' context lines were omitted - set */
/* up to fill them in from the old file context */
if (!p_context && p_repl_lines == 1) {
p_repl_lines = 0;
p_max--;
}
fillsrc = 1;
filldst = repl_beginning + 1;
fillcnt = p_repl_lines;
p_end = p_max;
} else if (!p_context && fillcnt == 1) {
/* the first hunk was a null hunk with no context */
/* and we were expecting one line -- fix it up. */
while (filldst < p_end) {
p_line[filldst] = p_line[filldst + 1];
p_char[filldst] = p_char[filldst + 1];
p_len[filldst] = p_len[filldst + 1];
filldst++;
}
#if 0
repl_beginning--; /* this doesn't need to be fixed */
#endif
p_end--;
p_first++; /* do append rather than insert */
fillcnt = 0;
p_ptrn_lines = 0;
}
if (diff_type == CONTEXT_DIFF &&
(fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) {
if (verbose)
say("%s\n%s\n%s\n",
"(Fascinating--this is really a new-style context diff but without",
"the telltale extra asterisks on the *** line that usually indicate",
"the new style...)");
diff_type = NEW_CONTEXT_DIFF;
}
/* if there were omitted context lines, fill them in now */
if (fillcnt) {
p_bfake = filldst; /* remember where not to free() */
p_efake = filldst + fillcnt - 1;
while (fillcnt-- > 0) {
while (fillsrc <= p_end && p_char[fillsrc] != ' ')
fillsrc++;
if (fillsrc > p_end)
fatal("replacement text or line numbers mangled in hunk at line %ld\n",
p_hunk_beg);
p_line[filldst] = p_line[fillsrc];
p_char[filldst] = p_char[fillsrc];
p_len[filldst] = p_len[fillsrc];
fillsrc++;
filldst++;
}
while (fillsrc <= p_end && fillsrc != repl_beginning &&
p_char[fillsrc] != ' ')
fillsrc++;
#ifdef DEBUGGING
if (debug & 64)
printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
fillsrc, filldst, repl_beginning, p_end + 1);
#endif
if (fillsrc != p_end + 1 && fillsrc != repl_beginning)
malformed();
if (filldst != p_end + 1 && filldst != repl_beginning)
malformed();
}
if (p_line[p_end] != NULL) {
if (remove_special_line()) {
p_len[p_end] -= 1;
(p_line[p_end])[p_len[p_end]] = 0;
}
}
} else if (diff_type == UNI_DIFF) {
LINENUM fillold; /* index of old lines */
LINENUM fillnew; /* index of new lines */
char ch;
line_beginning = ftello(pfp); /* file pos of the current line */
len = pgets(true);
p_input_line++;
if (len == 0 || strnNE(buf, "@@ -", 4)) {
next_intuit_at(line_beginning, p_input_line);
return false;
}
s = buf + 4;
if (!*s)
malformed();
p_first = strtolinenum(s, &s);
if (*s == ',') {
p_ptrn_lines = strtolinenum(s + 1, &s);
} else
p_ptrn_lines = 1;
if (*s == ' ')
s++;
if (*s != '+' || !*++s)
malformed();
p_newfirst = strtolinenum(s, &s);
if (*s == ',') {
p_repl_lines = strtolinenum(s + 1, &s);
} else
p_repl_lines = 1;
if (*s == ' ')
s++;
if (*s != '@')
malformed();
if (p_first >= LINENUM_MAX - p_ptrn_lines ||
p_newfirst > LINENUM_MAX - p_repl_lines ||
p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
malformed();
if (!p_ptrn_lines)
p_first++; /* do append rather than insert */
p_max = p_ptrn_lines + p_repl_lines + 1;
while (p_max >= hunkmax)
grow_hunkmax();
fillold = 1;
fillnew = fillold + p_ptrn_lines;
p_end = fillnew + p_repl_lines;
snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first,
p_first + p_ptrn_lines - 1);
p_line[0] = savestr(buf);
if (out_of_mem) {
p_end = -1;
return false;
}
p_char[0] = '*';
snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst,
p_newfirst + p_repl_lines - 1);
p_line[fillnew] = savestr(buf);
if (out_of_mem) {
p_end = 0;
return false;
}
p_char[fillnew++] = '=';
p_context = 100;
context = 0;
p_hunk_beg = p_input_line + 1;
while (fillold <= p_ptrn_lines || fillnew <= p_end) {
line_beginning = ftello(pfp);
len = pgets(true);
p_input_line++;
if (len == 0) {
if (p_max - fillnew < 3) {
/* assume blank lines got chopped */
strlcpy(buf, " \n", buf_size);
} else {
fatal("unexpected end of file in patch\n");
}
}
if (*buf == '\t' || *buf == '\n') {
ch = ' '; /* assume the space got eaten */
s = savestr(buf);
} else {
ch = *buf;
s = savestr(buf + 1);
}
if (out_of_mem) {
while (--fillnew > p_ptrn_lines)
free(p_line[fillnew]);
p_end = fillold - 1;
return false;
}
switch (ch) {
case '-':
if (fillold > p_ptrn_lines) {
free(s);
p_end = fillnew - 1;
malformed();
}
p_char[fillold] = ch;
p_line[fillold] = s;
p_len[fillold++] = strlen(s);
if (fillold > p_ptrn_lines) {
if (remove_special_line()) {
p_len[fillold - 1] -= 1;
s[p_len[fillold - 1]] = 0;
}
}
break;
case '=':
ch = ' ';
/* FALL THROUGH */
case ' ':
if (fillold > p_ptrn_lines) {
free(s);
while (--fillnew > p_ptrn_lines)
free(p_line[fillnew]);
p_end = fillold - 1;
malformed();
}
context++;
p_char[fillold] = ch;
p_line[fillold] = s;
p_len[fillold++] = strlen(s);
s = savestr(s);
if (out_of_mem) {
while (--fillnew > p_ptrn_lines)
free(p_line[fillnew]);
p_end = fillold - 1;
return false;
}
if (fillold > p_ptrn_lines) {
if (remove_special_line()) {
p_len[fillold - 1] -= 1;
s[p_len[fillold - 1]] = 0;
}
}
/* FALL THROUGH */
case '+':
if (fillnew > p_end) {
free(s);
while (--fillnew > p_ptrn_lines)
free(p_line[fillnew]);
p_end = fillold - 1;
malformed();
}
p_char[fillnew] = ch;
p_line[fillnew] = s;
p_len[fillnew++] = strlen(s);
if (fillold > p_ptrn_lines) {
if (remove_special_line()) {
p_len[fillnew - 1] -= 1;
s[p_len[fillnew - 1]] = 0;
}
}
break;
default:
p_end = fillnew;
malformed();
}
if (ch != ' ' && context > 0) {
if (context < p_context)
p_context = context;
context = -1000;
}
} /* while */
} else { /* normal diff--fake it up */
char hunk_type;
int i;
LINENUM min, max;
line_beginning = ftello(pfp);
p_context = 0;
len = pgets(true);
p_input_line++;
if (len == 0 || !isdigit((unsigned char)*buf)) {
next_intuit_at(line_beginning, p_input_line);
return false;
}
p_first = strtolinenum(buf, &s);
if (*s == ',') {
p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1;
if (p_ptrn_lines < 0)
malformed();
} else
p_ptrn_lines = (*s != 'a');
hunk_type = *s;
if (hunk_type == 'a')
p_first++; /* do append rather than insert */
min = strtolinenum(s + 1, &s);
if (*s == ',')
max = strtolinenum(s + 1, &s);
else
max = min;
if (min < 0 || min > max || max - min == LINENUM_MAX)
malformed();
if (hunk_type == 'd')
min++;
p_newfirst = min;
p_repl_lines = max - min + 1;
if (p_newfirst > LINENUM_MAX - p_repl_lines ||
p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
malformed();
p_end = p_ptrn_lines + p_repl_lines + 1;
if (p_end > MAXHUNKSIZE)
fatal("hunk too large (%ld lines) at line %ld: %s",
p_end, p_input_line, buf);
while (p_end >= hunkmax)
grow_hunkmax();
snprintf(buf, buf_size, "*** %ld,%ld\n", p_first,
p_first + p_ptrn_lines - 1);
p_line[0] = savestr(buf);
if (out_of_mem) {
p_end = -1;
return false;
}
p_char[0] = '*';
for (i = 1; i <= p_ptrn_lines; i++) {
len = pgets(true);
p_input_line++;
if (len == 0)
fatal("unexpected end of file in patch at line %ld\n",
p_input_line);
if (*buf != '<')
fatal("< expected at line %ld of patch\n",
p_input_line);
p_line[i] = savestr(buf + 2);
if (out_of_mem) {
p_end = i - 1;
return false;
}
p_len[i] = strlen(p_line[i]);
p_char[i] = '-';
}
if (remove_special_line()) {
p_len[i - 1] -= 1;
(p_line[i - 1])[p_len[i - 1]] = 0;
}
if (hunk_type == 'c') {
len = pgets(true);
p_input_line++;
if (len == 0)
fatal("unexpected end of file in patch at line %ld\n",
p_input_line);
if (*buf != '-')
fatal("--- expected at line %ld of patch\n",
p_input_line);
}
snprintf(buf, buf_size, "--- %ld,%ld\n", min, max);
p_line[i] = savestr(buf);
if (out_of_mem) {
p_end = i - 1;
return false;
}
p_char[i] = '=';
for (i++; i <= p_end; i++) {
len = pgets(true);
p_input_line++;
if (len == 0)
fatal("unexpected end of file in patch at line %ld\n",
p_input_line);
if (*buf != '>')
fatal("> expected at line %ld of patch\n",
p_input_line);
/* Don't overrun if we don't have enough line */
if (len > 2)
p_line[i] = savestr(buf + 2);
else
p_line[i] = savestr("");
if (out_of_mem) {
p_end = i - 1;
return false;
}
p_len[i] = strlen(p_line[i]);
p_char[i] = '+';
}
if (remove_special_line()) {
p_len[i - 1] -= 1;
(p_line[i - 1])[p_len[i - 1]] = 0;
}
}
if (reverse) /* backwards patch? */
if (!pch_swap())
say("Not enough memory to swap next hunk!\n");
#ifdef DEBUGGING
if (debug & 2) {
LINENUM i;
char special;
for (i = 0; i <= p_end; i++) {
if (i == p_ptrn_lines)
special = '^';
else
special = ' ';
fprintf(stderr, "%3ld %c %c %s", i, p_char[i],
special, p_line[i]);
fflush(stderr);
}
}
#endif
if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */
p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */
return true;
}
/*
* Input a line from the patch file.
* Worry about indentation if do_indent is true.
* The line is read directly into the buf global variable which
* is resized if necessary in order to hold the complete line.
* Returns the number of characters read including the terminating
* '\n', if any.
*/
size_t
pgets(bool do_indent)
{
char *line;
size_t len;
int indent = 0, skipped = 0;
line = fgetln(pfp, &len);
if (line != NULL) {
if (len + 1 > buf_size) {
while (len + 1 > buf_size)
buf_size *= 2;
free(buf);
buf = malloc(buf_size);
if (buf == NULL)
fatal("out of memory\n");
}
if (do_indent == 1 && p_indent) {
for (;
indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X');
line++, skipped++) {
if (*line == '\t')
indent += 8 - (indent %7);
else
indent++;
}
}
memcpy(buf, line, len - skipped);
buf[len - skipped] = '\0';
}
return len;
}
/*
* Reverse the old and new portions of the current hunk.
*/
bool
pch_swap(void)
{
char **tp_line; /* the text of the hunk */
unsigned short *tp_len;/* length of each line */
char *tp_char; /* +, -, and ! */
LINENUM i;
LINENUM n;
bool blankline = false;
char *s;
i = p_first;
p_first = p_newfirst;
p_newfirst = i;
/* make a scratch copy */
tp_line = p_line;
tp_len = p_len;
tp_char = p_char;
p_line = NULL; /* force set_hunkmax to allocate again */
p_len = NULL;
p_char = NULL;
set_hunkmax();
if (p_line == NULL || p_len == NULL || p_char == NULL) {
free(p_line);
p_line = tp_line;
free(p_len);
p_len = tp_len;
free(p_char);
p_char = tp_char;
return false; /* not enough memory to swap hunk! */
}
/* now turn the new into the old */
i = p_ptrn_lines + 1;
if (tp_char[i] == '\n') { /* account for possible blank line */
blankline = true;
i++;
}
if (p_efake >= 0) { /* fix non-freeable ptr range */
if (p_efake <= i)
n = p_end - i + 1;
else
n = -i;
p_efake += n;
p_bfake += n;
}
for (n = 0; i <= p_end; i++, n++) {
p_line[n] = tp_line[i];
p_char[n] = tp_char[i];
if (p_char[n] == '+')
p_char[n] = '-';
p_len[n] = tp_len[i];
}
if (blankline) {
i = p_ptrn_lines + 1;
p_line[n] = tp_line[i];
p_char[n] = tp_char[i];
p_len[n] = tp_len[i];
n++;
}
if (p_char[0] != '=')
fatal("Malformed patch at line %ld: expected '=' found '%c'\n",
p_input_line, p_char[0]);
p_char[0] = '*';
for (s = p_line[0]; *s; s++)
if (*s == '-')
*s = '*';
/* now turn the old into the new */
if (p_char[0] != '*')
fatal("Malformed patch at line %ld: expected '*' found '%c'\n",
p_input_line, p_char[0]);
tp_char[0] = '=';
for (s = tp_line[0]; *s; s++)
if (*s == '*')
*s = '-';
for (i = 0; n <= p_end; i++, n++) {
p_line[n] = tp_line[i];
p_char[n] = tp_char[i];
if (p_char[n] == '-')
p_char[n] = '+';
p_len[n] = tp_len[i];
}
if (i != p_ptrn_lines + 1)
fatal("Malformed patch at line %ld: expected %ld lines, "
"got %ld\n",
p_input_line, p_ptrn_lines + 1, i);
i = p_ptrn_lines;
p_ptrn_lines = p_repl_lines;
p_repl_lines = i;
free(tp_line);
free(tp_len);
free(tp_char);
return true;
}
/*
* Return the specified line position in the old file of the old context.
*/
LINENUM
pch_first(void)
{
return p_first;
}
/*
* Return the number of lines of old context.
*/
LINENUM
pch_ptrn_lines(void)
{
return p_ptrn_lines;
}
/*
* Return the probable line position in the new file of the first line.
*/
LINENUM
pch_newfirst(void)
{
return p_newfirst;
}
/*
* Return the number of lines in the replacement text including context.
*/
LINENUM
pch_repl_lines(void)
{
return p_repl_lines;
}
/*
* Return the number of lines in the whole hunk.
*/
LINENUM
pch_end(void)
{
return p_end;
}
/*
* Return the number of context lines before the first changed line.
*/
LINENUM
pch_context(void)
{
return p_context;
}
/*
* Return the length of a particular patch line.
*/
unsigned short
pch_line_len(LINENUM line)
{
return p_len[line];
}
/*
* Return the control character (+, -, *, !, etc) for a patch line.
*/
char
pch_char(LINENUM line)
{
return p_char[line];
}
/*
* Return a pointer to a particular patch line.
*/
char *
pfetch(LINENUM line)
{
return p_line[line];
}
/*
* Return where in the patch file this hunk began, for error messages.
*/
LINENUM
pch_hunk_beg(void)
{
return p_hunk_beg;
}
/*
* Apply an ed script by feeding ed itself.
*/
void
do_ed_script(void)
{
char *t;
off_t beginning_of_this_line;
FILE *pipefp = NULL;
int continuation;
if (!skip_rest_of_patch) {
if (copy_file(filearg[0], TMPOUTNAME) < 0) {
unlink(TMPOUTNAME);
fatal("can't create temp file %s", TMPOUTNAME);
}
snprintf(buf, buf_size, "%s%s%s", _PATH_RED,
verbose ? " " : " -s ", TMPOUTNAME);
pipefp = popen(buf, "w");
}
for (;;) {
beginning_of_this_line = ftello(pfp);
if (pgets(true) == 0) {
next_intuit_at(beginning_of_this_line, p_input_line);
break;
}
p_input_line++;
for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++)
;
/* POSIX defines allowed commands as {a,c,d,i,s} */
if (isdigit((unsigned char)*buf) &&
(*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) {
if (pipefp != NULL)
fputs(buf, pipefp);
if (*t == 's') {
for (;;) {
continuation = 0;
t = strchr(buf, '\0') - 1;
while (--t >= buf && *t == '\\')
continuation = !continuation;
if (!continuation ||
pgets(true) == 0)
break;
if (pipefp != NULL)
fputs(buf, pipefp);
}
} else if (*t != 'd') {
while (pgets(true)) {
p_input_line++;
if (pipefp != NULL)
fputs(buf, pipefp);
if (strEQ(buf, ".\n"))
break;
}
}
} else {
next_intuit_at(beginning_of_this_line, p_input_line);
break;
}
}
if (pipefp == NULL)
return;
fprintf(pipefp, "w\n");
fprintf(pipefp, "q\n");
fflush(pipefp);
pclose(pipefp);
ignore_signals();
if (!check_only) {
if (move_file(TMPOUTNAME, outname) < 0) {
toutkeep = true;
chmod(TMPOUTNAME, filemode);
} else
chmod(outname, filemode);
}
set_signals(1);
}
/*
* Choose the name of the file to be patched based on POSIX rules.
* NOTE: the POSIX rules are amazingly stupid and we only follow them
* if the user specified --posix or set POSIXLY_CORRECT.
*/
static char *
posix_name(const struct file_name *names, bool assume_exists)
{
char *path = NULL;
int i;
/*
* POSIX states that the filename will be chosen from one
* of the old, new and index names (in that order) if
* the file exists relative to CWD after -p stripping.
*/
for (i = 0; i < MAX_FILE; i++) {
if (names[i].path != NULL && names[i].exists) {
path = names[i].path;
break;
}
}
if (path == NULL && !assume_exists) {
/*
* No files found, check to see if the diff could be
* creating a new file.
*/
if (path == NULL && ok_to_create_file &&
names[NEW_FILE].path != NULL)
path = names[NEW_FILE].path;
}
return path ? xstrdup(path) : NULL;
}
static char *
compare_names(const struct file_name *names, bool assume_exists)
{
size_t min_components, min_baselen, min_len, tmp;
char *best = NULL;
char *path;
int i;
/*
* The "best" name is the one with the fewest number of path
* components, the shortest basename length, and the shortest
* overall length (in that order). We only use the Index: file
* if neither of the old or new files could be intuited from
* the diff header.
*/
min_components = min_baselen = min_len = SIZE_MAX;
for (i = INDEX_FILE; i >= OLD_FILE; i--) {
path = names[i].path;
if (path == NULL || (!names[i].exists && !assume_exists))
continue;
if ((tmp = num_components(path)) > min_components)
continue;
if (tmp < min_components) {
min_components = tmp;
best = path;
}
if ((tmp = strlen(basename(path))) > min_baselen)
continue;
if (tmp < min_baselen) {
min_baselen = tmp;
best = path;
}
if ((tmp = strlen(path)) > min_len)
continue;
min_len = tmp;
best = path;
}
return best;
}
/*
* Choose the name of the file to be patched based the "best" one
* available.
*/
static char *
best_name(const struct file_name *names, bool assume_exists)
{
char *best;
best = compare_names(names, assume_exists);
/* No match? Check to see if the diff could be creating a new file. */
if (best == NULL && ok_to_create_file)
best = names[NEW_FILE].path;
return best ? xstrdup(best) : NULL;
}
static size_t
num_components(const char *path)
{
size_t n;
const char *cp;
for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) {
while (*cp == '/')
cp++; /* skip consecutive slashes */
}
return n;
}
/*
* Convert number at NPTR into LINENUM and save address of first
* character that is not a digit in ENDPTR. If conversion is not
* possible, call fatal.
*/
static LINENUM
strtolinenum(char *nptr, char **endptr)
{
LINENUM rv;
char c;
char *p;
const char *errstr;
for (p = nptr; isdigit((unsigned char)*p); p++)
;
if (p == nptr)
malformed();
c = *p;
*p = '\0';
rv = strtonum(nptr, 0, LINENUM_MAX, &errstr);
if (errstr != NULL)
fatal("invalid line number at line %ld: `%s' is %s\n",
p_input_line, nptr, errstr);
*p = c;
*endptr = p;
return rv;
}
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