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freebsd-skq/usr.bin/patch/pch.c
pfg 286a9f019c patch(1): add support for git generated diffs. 
Sometimes patches coming from other places have extra a/ and b/
directories prepended to filenames.

Obtained from:	OpenBSD (CVS rev. 1.57, 1.58)
2017-07-02 21:00:30 +00:00

1630 lines
40 KiB
C
Raw Blame History

/*-
* 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 */
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 (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);
}
if (!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)
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)
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;
}
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);
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 (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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