зеркало из https://github.com/microsoft/git.git
1306 строки
29 KiB
C
1306 строки
29 KiB
C
/*
|
|
* apply.c
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
*
|
|
* This applies patches on top of some (arbitrary) version of the SCM.
|
|
*
|
|
* NOTE! It does all its work in the index file, and only cares about
|
|
* the files in the working directory if you tell it to "merge" the
|
|
* patch apply.
|
|
*
|
|
* Even when merging it always takes the source from the index, and
|
|
* uses the working tree as a "branch" for a 3-way merge.
|
|
*/
|
|
#include <ctype.h>
|
|
|
|
#include "cache.h"
|
|
|
|
// We default to the merge behaviour, since that's what most people would
|
|
// expect.
|
|
//
|
|
// --check turns on checking that the working tree matches the
|
|
// files that are being modified, but doesn't apply the patch
|
|
// --stat does just a diffstat, and doesn't actually apply
|
|
// --show-files shows the directory changes
|
|
//
|
|
static int merge_patch = 1;
|
|
static int check_index = 0;
|
|
static int write_index = 0;
|
|
static int diffstat = 0;
|
|
static int check = 0;
|
|
static int apply = 1;
|
|
static int show_files = 0;
|
|
static const char apply_usage[] = "git-apply [--stat] [--check] [--show-files] <patch>";
|
|
|
|
/*
|
|
* For "diff-stat" like behaviour, we keep track of the biggest change
|
|
* we've seen, and the longest filename. That allows us to do simple
|
|
* scaling.
|
|
*/
|
|
static int max_change, max_len;
|
|
|
|
/*
|
|
* Various "current state", notably line numbers and what
|
|
* file (and how) we're patching right now.. The "is_xxxx"
|
|
* things are flags, where -1 means "don't know yet".
|
|
*/
|
|
static int linenr = 1;
|
|
|
|
struct fragment {
|
|
unsigned long oldpos, oldlines;
|
|
unsigned long newpos, newlines;
|
|
const char *patch;
|
|
int size;
|
|
struct fragment *next;
|
|
};
|
|
|
|
struct patch {
|
|
char *new_name, *old_name, *def_name;
|
|
unsigned int old_mode, new_mode;
|
|
int is_rename, is_copy, is_new, is_delete;
|
|
int lines_added, lines_deleted;
|
|
struct fragment *fragments;
|
|
char *result;
|
|
unsigned long resultsize;
|
|
struct patch *next;
|
|
};
|
|
|
|
#define CHUNKSIZE (8192)
|
|
#define SLOP (16)
|
|
|
|
static void *read_patch_file(int fd, unsigned long *sizep)
|
|
{
|
|
unsigned long size = 0, alloc = CHUNKSIZE;
|
|
void *buffer = xmalloc(alloc);
|
|
|
|
for (;;) {
|
|
int nr = alloc - size;
|
|
if (nr < 1024) {
|
|
alloc += CHUNKSIZE;
|
|
buffer = xrealloc(buffer, alloc);
|
|
nr = alloc - size;
|
|
}
|
|
nr = read(fd, buffer + size, nr);
|
|
if (!nr)
|
|
break;
|
|
if (nr < 0) {
|
|
if (errno == EAGAIN)
|
|
continue;
|
|
die("git-apply: read returned %s", strerror(errno));
|
|
}
|
|
size += nr;
|
|
}
|
|
*sizep = size;
|
|
|
|
/*
|
|
* Make sure that we have some slop in the buffer
|
|
* so that we can do speculative "memcmp" etc, and
|
|
* see to it that it is NUL-filled.
|
|
*/
|
|
if (alloc < size + SLOP)
|
|
buffer = xrealloc(buffer, size + SLOP);
|
|
memset(buffer + size, 0, SLOP);
|
|
return buffer;
|
|
}
|
|
|
|
static unsigned long linelen(const char *buffer, unsigned long size)
|
|
{
|
|
unsigned long len = 0;
|
|
while (size--) {
|
|
len++;
|
|
if (*buffer++ == '\n')
|
|
break;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static int is_dev_null(const char *str)
|
|
{
|
|
return !memcmp("/dev/null", str, 9) && isspace(str[9]);
|
|
}
|
|
|
|
#define TERM_SPACE 1
|
|
#define TERM_TAB 2
|
|
|
|
static int name_terminate(const char *name, int namelen, int c, int terminate)
|
|
{
|
|
if (c == ' ' && !(terminate & TERM_SPACE))
|
|
return 0;
|
|
if (c == '\t' && !(terminate & TERM_TAB))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static char * find_name(const char *line, char *def, int p_value, int terminate)
|
|
{
|
|
int len;
|
|
const char *start = line;
|
|
char *name;
|
|
|
|
for (;;) {
|
|
char c = *line;
|
|
|
|
if (isspace(c)) {
|
|
if (c == '\n')
|
|
break;
|
|
if (name_terminate(start, line-start, c, terminate))
|
|
break;
|
|
}
|
|
line++;
|
|
if (c == '/' && !--p_value)
|
|
start = line;
|
|
}
|
|
if (!start)
|
|
return def;
|
|
len = line - start;
|
|
if (!len)
|
|
return def;
|
|
|
|
/*
|
|
* Generally we prefer the shorter name, especially
|
|
* if the other one is just a variation of that with
|
|
* something else tacked on to the end (ie "file.orig"
|
|
* or "file~").
|
|
*/
|
|
if (def) {
|
|
int deflen = strlen(def);
|
|
if (deflen < len && !strncmp(start, def, deflen))
|
|
return def;
|
|
}
|
|
|
|
name = xmalloc(len + 1);
|
|
memcpy(name, start, len);
|
|
name[len] = 0;
|
|
free(def);
|
|
return name;
|
|
}
|
|
|
|
/*
|
|
* Get the name etc info from the --/+++ lines of a traditional patch header
|
|
*
|
|
* NOTE! This hardcodes "-p1" behaviour in filename detection.
|
|
*
|
|
* FIXME! The end-of-filename heuristics are kind of screwy. For existing
|
|
* files, we can happily check the index for a match, but for creating a
|
|
* new file we should try to match whatever "patch" does. I have no idea.
|
|
*/
|
|
static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
|
|
{
|
|
int p_value = 1;
|
|
char *name;
|
|
|
|
first += 4; // skip "--- "
|
|
second += 4; // skip "+++ "
|
|
if (is_dev_null(first)) {
|
|
patch->is_new = 1;
|
|
patch->is_delete = 0;
|
|
name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB);
|
|
patch->new_name = name;
|
|
} else if (is_dev_null(second)) {
|
|
patch->is_new = 0;
|
|
patch->is_delete = 1;
|
|
name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
|
|
patch->old_name = name;
|
|
} else {
|
|
name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
|
|
name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB);
|
|
patch->old_name = patch->new_name = name;
|
|
}
|
|
if (!name)
|
|
die("unable to find filename in patch at line %d", linenr);
|
|
}
|
|
|
|
static int gitdiff_hdrend(const char *line, struct patch *patch)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* We're anal about diff header consistency, to make
|
|
* sure that we don't end up having strange ambiguous
|
|
* patches floating around.
|
|
*
|
|
* As a result, gitdiff_{old|new}name() will check
|
|
* their names against any previous information, just
|
|
* to make sure..
|
|
*/
|
|
static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
|
|
{
|
|
int len;
|
|
const char *name;
|
|
|
|
if (!orig_name && !isnull)
|
|
return find_name(line, NULL, 1, 0);
|
|
|
|
name = "/dev/null";
|
|
len = 9;
|
|
if (orig_name) {
|
|
name = orig_name;
|
|
len = strlen(name);
|
|
if (isnull)
|
|
die("git-apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
|
|
}
|
|
|
|
if (*name == '/')
|
|
goto absolute_path;
|
|
|
|
for (;;) {
|
|
char c = *line++;
|
|
if (c == '\n')
|
|
break;
|
|
if (c != '/')
|
|
continue;
|
|
absolute_path:
|
|
if (memcmp(line, name, len) || line[len] != '\n')
|
|
break;
|
|
return orig_name;
|
|
}
|
|
die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
|
|
return NULL;
|
|
}
|
|
|
|
static int gitdiff_oldname(const char *line, struct patch *patch)
|
|
{
|
|
patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_newname(const char *line, struct patch *patch)
|
|
{
|
|
patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_oldmode(const char *line, struct patch *patch)
|
|
{
|
|
patch->old_mode = strtoul(line, NULL, 8);
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_newmode(const char *line, struct patch *patch)
|
|
{
|
|
patch->new_mode = strtoul(line, NULL, 8);
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_delete(const char *line, struct patch *patch)
|
|
{
|
|
patch->is_delete = 1;
|
|
patch->old_name = patch->def_name;
|
|
return gitdiff_oldmode(line, patch);
|
|
}
|
|
|
|
static int gitdiff_newfile(const char *line, struct patch *patch)
|
|
{
|
|
patch->is_new = 1;
|
|
patch->new_name = patch->def_name;
|
|
return gitdiff_newmode(line, patch);
|
|
}
|
|
|
|
static int gitdiff_copysrc(const char *line, struct patch *patch)
|
|
{
|
|
patch->is_copy = 1;
|
|
patch->old_name = find_name(line, NULL, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_copydst(const char *line, struct patch *patch)
|
|
{
|
|
patch->is_copy = 1;
|
|
patch->new_name = find_name(line, NULL, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_renamesrc(const char *line, struct patch *patch)
|
|
{
|
|
patch->is_rename = 1;
|
|
patch->old_name = find_name(line, NULL, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_renamedst(const char *line, struct patch *patch)
|
|
{
|
|
patch->is_rename = 1;
|
|
patch->new_name = find_name(line, NULL, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_similarity(const char *line, struct patch *patch)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int gitdiff_dissimilarity(const char *line, struct patch *patch)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is normal for a diff that doesn't change anything: we'll fall through
|
|
* into the next diff. Tell the parser to break out.
|
|
*/
|
|
static int gitdiff_unrecognized(const char *line, struct patch *patch)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static char *git_header_name(char *line)
|
|
{
|
|
int len;
|
|
char *name, *second;
|
|
|
|
/*
|
|
* Find the first '/'
|
|
*/
|
|
name = line;
|
|
for (;;) {
|
|
char c = *name++;
|
|
if (c == '\n')
|
|
return NULL;
|
|
if (c == '/')
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We don't accept absolute paths (/dev/null) as possibly valid
|
|
*/
|
|
if (name == line+1)
|
|
return NULL;
|
|
|
|
/*
|
|
* Accept a name only if it shows up twice, exactly the same
|
|
* form.
|
|
*/
|
|
for (len = 0 ; ; len++) {
|
|
char c = name[len];
|
|
|
|
switch (c) {
|
|
default:
|
|
continue;
|
|
case '\n':
|
|
break;
|
|
case '\t': case ' ':
|
|
second = name+len;
|
|
for (;;) {
|
|
char c = *second++;
|
|
if (c == '\n')
|
|
return NULL;
|
|
if (c == '/')
|
|
break;
|
|
}
|
|
if (second[len] == '\n' && !memcmp(name, second, len)) {
|
|
char *ret = xmalloc(len + 1);
|
|
memcpy(ret, name, len);
|
|
ret[len] = 0;
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Verify that we recognize the lines following a git header */
|
|
static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
|
|
{
|
|
unsigned long offset;
|
|
|
|
/* A git diff has explicit new/delete information, so we don't guess */
|
|
patch->is_new = 0;
|
|
patch->is_delete = 0;
|
|
|
|
/*
|
|
* Some things may not have the old name in the
|
|
* rest of the headers anywhere (pure mode changes,
|
|
* or removing or adding empty files), so we get
|
|
* the default name from the header.
|
|
*/
|
|
patch->def_name = git_header_name(line + strlen("diff --git "));
|
|
|
|
line += len;
|
|
size -= len;
|
|
linenr++;
|
|
for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
|
|
static const struct opentry {
|
|
const char *str;
|
|
int (*fn)(const char *, struct patch *);
|
|
} optable[] = {
|
|
{ "@@ -", gitdiff_hdrend },
|
|
{ "--- ", gitdiff_oldname },
|
|
{ "+++ ", gitdiff_newname },
|
|
{ "old mode ", gitdiff_oldmode },
|
|
{ "new mode ", gitdiff_newmode },
|
|
{ "deleted file mode ", gitdiff_delete },
|
|
{ "new file mode ", gitdiff_newfile },
|
|
{ "copy from ", gitdiff_copysrc },
|
|
{ "copy to ", gitdiff_copydst },
|
|
{ "rename old ", gitdiff_renamesrc },
|
|
{ "rename new ", gitdiff_renamedst },
|
|
{ "rename from ", gitdiff_renamesrc },
|
|
{ "rename to ", gitdiff_renamedst },
|
|
{ "similarity index ", gitdiff_similarity },
|
|
{ "dissimilarity index ", gitdiff_dissimilarity },
|
|
{ "", gitdiff_unrecognized },
|
|
};
|
|
int i;
|
|
|
|
len = linelen(line, size);
|
|
if (!len || line[len-1] != '\n')
|
|
break;
|
|
for (i = 0; i < sizeof(optable) / sizeof(optable[0]); i++) {
|
|
const struct opentry *p = optable + i;
|
|
int oplen = strlen(p->str);
|
|
if (len < oplen || memcmp(p->str, line, oplen))
|
|
continue;
|
|
if (p->fn(line + oplen, patch) < 0)
|
|
return offset;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int parse_num(const char *line, unsigned long *p)
|
|
{
|
|
char *ptr;
|
|
|
|
if (!isdigit(*line))
|
|
return 0;
|
|
*p = strtoul(line, &ptr, 10);
|
|
return ptr - line;
|
|
}
|
|
|
|
static int parse_range(const char *line, int len, int offset, const char *expect,
|
|
unsigned long *p1, unsigned long *p2)
|
|
{
|
|
int digits, ex;
|
|
|
|
if (offset < 0 || offset >= len)
|
|
return -1;
|
|
line += offset;
|
|
len -= offset;
|
|
|
|
digits = parse_num(line, p1);
|
|
if (!digits)
|
|
return -1;
|
|
|
|
offset += digits;
|
|
line += digits;
|
|
len -= digits;
|
|
|
|
*p2 = *p1;
|
|
if (*line == ',') {
|
|
digits = parse_num(line+1, p2);
|
|
if (!digits)
|
|
return -1;
|
|
|
|
offset += digits+1;
|
|
line += digits+1;
|
|
len -= digits+1;
|
|
}
|
|
|
|
ex = strlen(expect);
|
|
if (ex > len)
|
|
return -1;
|
|
if (memcmp(line, expect, ex))
|
|
return -1;
|
|
|
|
return offset + ex;
|
|
}
|
|
|
|
/*
|
|
* Parse a unified diff fragment header of the
|
|
* form "@@ -a,b +c,d @@"
|
|
*/
|
|
static int parse_fragment_header(char *line, int len, struct fragment *fragment)
|
|
{
|
|
int offset;
|
|
|
|
if (!len || line[len-1] != '\n')
|
|
return -1;
|
|
|
|
/* Figure out the number of lines in a fragment */
|
|
offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
|
|
offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
|
|
{
|
|
unsigned long offset, len;
|
|
|
|
patch->is_rename = patch->is_copy = 0;
|
|
patch->is_new = patch->is_delete = -1;
|
|
patch->old_mode = patch->new_mode = 0;
|
|
patch->old_name = patch->new_name = NULL;
|
|
for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
|
|
unsigned long nextlen;
|
|
|
|
len = linelen(line, size);
|
|
if (!len)
|
|
break;
|
|
|
|
/* Testing this early allows us to take a few shortcuts.. */
|
|
if (len < 6)
|
|
continue;
|
|
|
|
/*
|
|
* Make sure we don't find any unconnected patch fragmants.
|
|
* That's a sign that we didn't find a header, and that a
|
|
* patch has become corrupted/broken up.
|
|
*/
|
|
if (!memcmp("@@ -", line, 4)) {
|
|
struct fragment dummy;
|
|
if (parse_fragment_header(line, len, &dummy) < 0)
|
|
continue;
|
|
error("patch fragment without header at line %d: %.*s", linenr, len-1, line);
|
|
}
|
|
|
|
if (size < len + 6)
|
|
break;
|
|
|
|
/*
|
|
* Git patch? It might not have a real patch, just a rename
|
|
* or mode change, so we handle that specially
|
|
*/
|
|
if (!memcmp("diff --git ", line, 11)) {
|
|
int git_hdr_len = parse_git_header(line, len, size, patch);
|
|
if (git_hdr_len < 0)
|
|
continue;
|
|
if (!patch->old_name && !patch->new_name)
|
|
die("git diff header lacks filename information (line %d)", linenr);
|
|
*hdrsize = git_hdr_len;
|
|
return offset;
|
|
}
|
|
|
|
/** --- followed by +++ ? */
|
|
if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4))
|
|
continue;
|
|
|
|
/*
|
|
* We only accept unified patches, so we want it to
|
|
* at least have "@@ -a,b +c,d @@\n", which is 14 chars
|
|
* minimum
|
|
*/
|
|
nextlen = linelen(line + len, size - len);
|
|
if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
|
|
continue;
|
|
|
|
/* Ok, we'll consider it a patch */
|
|
parse_traditional_patch(line, line+len, patch);
|
|
*hdrsize = len + nextlen;
|
|
linenr += 2;
|
|
return offset;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Parse a unified diff. Note that this really needs
|
|
* to parse each fragment separately, since the only
|
|
* way to know the difference between a "---" that is
|
|
* part of a patch, and a "---" that starts the next
|
|
* patch is to look at the line counts..
|
|
*/
|
|
static int parse_fragment(char *line, unsigned long size, struct patch *patch, struct fragment *fragment)
|
|
{
|
|
int added, deleted;
|
|
int len = linelen(line, size), offset;
|
|
unsigned long oldlines, newlines;
|
|
|
|
offset = parse_fragment_header(line, len, fragment);
|
|
if (offset < 0)
|
|
return -1;
|
|
oldlines = fragment->oldlines;
|
|
newlines = fragment->newlines;
|
|
|
|
if (patch->is_new < 0) {
|
|
patch->is_new = !oldlines;
|
|
if (!oldlines)
|
|
patch->old_name = NULL;
|
|
}
|
|
if (patch->is_delete < 0) {
|
|
patch->is_delete = !newlines;
|
|
if (!newlines)
|
|
patch->new_name = NULL;
|
|
}
|
|
|
|
if (patch->is_new != !oldlines)
|
|
return error("new file depends on old contents");
|
|
if (patch->is_delete != !newlines)
|
|
return error("deleted file still has contents");
|
|
|
|
/* Parse the thing.. */
|
|
line += len;
|
|
size -= len;
|
|
linenr++;
|
|
added = deleted = 0;
|
|
for (offset = len; size > 0; offset += len, size -= len, line += len, linenr++) {
|
|
if (!oldlines && !newlines)
|
|
break;
|
|
len = linelen(line, size);
|
|
if (!len || line[len-1] != '\n')
|
|
return -1;
|
|
switch (*line) {
|
|
default:
|
|
return -1;
|
|
case ' ':
|
|
oldlines--;
|
|
newlines--;
|
|
break;
|
|
case '-':
|
|
deleted++;
|
|
oldlines--;
|
|
break;
|
|
case '+':
|
|
added++;
|
|
newlines--;
|
|
break;
|
|
/* We allow "\ No newline at end of file" */
|
|
case '\\':
|
|
if (len < 12 || memcmp(line, "\\ No newline", 12))
|
|
return -1;
|
|
break;
|
|
}
|
|
}
|
|
patch->lines_added += added;
|
|
patch->lines_deleted += deleted;
|
|
return offset;
|
|
}
|
|
|
|
static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
|
|
{
|
|
unsigned long offset = 0;
|
|
struct fragment **fragp = &patch->fragments;
|
|
|
|
while (size > 4 && !memcmp(line, "@@ -", 4)) {
|
|
struct fragment *fragment;
|
|
int len;
|
|
|
|
fragment = xmalloc(sizeof(*fragment));
|
|
memset(fragment, 0, sizeof(*fragment));
|
|
len = parse_fragment(line, size, patch, fragment);
|
|
if (len <= 0)
|
|
die("corrupt patch at line %d", linenr);
|
|
|
|
fragment->patch = line;
|
|
fragment->size = len;
|
|
|
|
*fragp = fragment;
|
|
fragp = &fragment->next;
|
|
|
|
offset += len;
|
|
line += len;
|
|
size -= len;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
|
|
{
|
|
int hdrsize, patchsize;
|
|
int offset = find_header(buffer, size, &hdrsize, patch);
|
|
|
|
if (offset < 0)
|
|
return offset;
|
|
|
|
patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
|
|
|
|
return offset + hdrsize + patchsize;
|
|
}
|
|
|
|
const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
|
|
const char minuses[]= "----------------------------------------------------------------------";
|
|
|
|
static void show_stats(struct patch *patch)
|
|
{
|
|
char *name = patch->old_name;
|
|
int len, max, add, del, total;
|
|
|
|
if (!name)
|
|
name = patch->new_name;
|
|
|
|
/*
|
|
* "scale" the filename
|
|
*/
|
|
len = strlen(name);
|
|
max = max_len;
|
|
if (max > 50)
|
|
max = 50;
|
|
if (len > max)
|
|
name += len - max;
|
|
len = max;
|
|
|
|
/*
|
|
* scale the add/delete
|
|
*/
|
|
max = max_change;
|
|
if (max + len > 70)
|
|
max = 70 - len;
|
|
|
|
add = patch->lines_added;
|
|
del = patch->lines_deleted;
|
|
total = add + del;
|
|
|
|
total = (total * max + max_change / 2) / max_change;
|
|
add = (add * max + max_change / 2) / max_change;
|
|
del = total - add;
|
|
printf(" %-*s |%5d %.*s%.*s\n",
|
|
len, name, patch->lines_added + patch->lines_deleted,
|
|
add, pluses, del, minuses);
|
|
}
|
|
|
|
static int read_old_data(struct stat *st, const char *path, void *buf, unsigned long size)
|
|
{
|
|
int fd;
|
|
unsigned long got;
|
|
|
|
switch (st->st_mode & S_IFMT) {
|
|
case S_IFLNK:
|
|
return readlink(path, buf, size);
|
|
case S_IFREG:
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return error("unable to open %s", path);
|
|
got = 0;
|
|
for (;;) {
|
|
int ret = read(fd, buf + got, size - got);
|
|
if (ret < 0) {
|
|
if (errno == EAGAIN)
|
|
continue;
|
|
break;
|
|
}
|
|
if (!ret)
|
|
break;
|
|
got += ret;
|
|
}
|
|
close(fd);
|
|
return got;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int find_offset(const char *buf, unsigned long size, const char *fragment, unsigned long fragsize, int line)
|
|
{
|
|
int i;
|
|
unsigned long start, backwards, forwards;
|
|
|
|
if (fragsize > size)
|
|
return -1;
|
|
|
|
start = 0;
|
|
if (line > 1) {
|
|
unsigned long offset = 0;
|
|
i = line-1;
|
|
while (offset + fragsize <= size) {
|
|
if (buf[offset++] == '\n') {
|
|
start = offset;
|
|
if (!--i)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Exact line number? */
|
|
if (!memcmp(buf + start, fragment, fragsize))
|
|
return start;
|
|
|
|
/*
|
|
* There's probably some smart way to do this, but I'll leave
|
|
* that to the smart and beautiful people. I'm simple and stupid.
|
|
*/
|
|
backwards = start;
|
|
forwards = start;
|
|
for (i = 0; ; i++) {
|
|
unsigned long try;
|
|
int n;
|
|
|
|
/* "backward" */
|
|
if (i & 1) {
|
|
if (!backwards) {
|
|
if (forwards + fragsize > size)
|
|
break;
|
|
continue;
|
|
}
|
|
do {
|
|
--backwards;
|
|
} while (backwards && buf[backwards-1] != '\n');
|
|
try = backwards;
|
|
} else {
|
|
while (forwards + fragsize <= size) {
|
|
if (buf[forwards++] == '\n')
|
|
break;
|
|
}
|
|
try = forwards;
|
|
}
|
|
|
|
if (try + fragsize > size)
|
|
continue;
|
|
if (memcmp(buf + try, fragment, fragsize))
|
|
continue;
|
|
n = (i >> 1)+1;
|
|
if (i & 1)
|
|
n = -n;
|
|
fprintf(stderr, "Fragment applied at offset %d\n", n);
|
|
return try;
|
|
}
|
|
|
|
/*
|
|
* We should start searching forward and backward.
|
|
*/
|
|
return -1;
|
|
}
|
|
|
|
struct buffer_desc {
|
|
char *buffer;
|
|
unsigned long size;
|
|
unsigned long alloc;
|
|
};
|
|
|
|
static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag)
|
|
{
|
|
char *buf = desc->buffer;
|
|
const char *patch = frag->patch;
|
|
int offset, size = frag->size;
|
|
char *old = xmalloc(size);
|
|
char *new = xmalloc(size);
|
|
int oldsize = 0, newsize = 0;
|
|
|
|
while (size > 0) {
|
|
int len = linelen(patch, size);
|
|
int plen;
|
|
|
|
if (!len)
|
|
break;
|
|
|
|
/*
|
|
* "plen" is how much of the line we should use for
|
|
* the actual patch data. Normally we just remove the
|
|
* first character on the line, but if the line is
|
|
* followed by "\ No newline", then we also remove the
|
|
* last one (which is the newline, of course).
|
|
*/
|
|
plen = len-1;
|
|
if (len > size && patch[len] == '\\')
|
|
plen--;
|
|
switch (*patch) {
|
|
case ' ':
|
|
case '-':
|
|
memcpy(old + oldsize, patch + 1, plen);
|
|
oldsize += plen;
|
|
if (*patch == '-')
|
|
break;
|
|
/* Fall-through for ' ' */
|
|
case '+':
|
|
memcpy(new + newsize, patch + 1, plen);
|
|
newsize += plen;
|
|
break;
|
|
case '@': case '\\':
|
|
/* Ignore it, we already handled it */
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
patch += len;
|
|
size -= len;
|
|
}
|
|
|
|
offset = find_offset(buf, desc->size, old, oldsize, frag->newpos);
|
|
if (offset >= 0) {
|
|
int diff = newsize - oldsize;
|
|
unsigned long size = desc->size + diff;
|
|
unsigned long alloc = desc->alloc;
|
|
|
|
if (size > alloc) {
|
|
alloc = size + 8192;
|
|
desc->alloc = alloc;
|
|
buf = xrealloc(buf, alloc);
|
|
desc->buffer = buf;
|
|
}
|
|
desc->size = size;
|
|
memmove(buf + offset + newsize, buf + offset + oldsize, size - offset - newsize);
|
|
memcpy(buf + offset, new, newsize);
|
|
offset = 0;
|
|
}
|
|
|
|
free(old);
|
|
free(new);
|
|
return offset;
|
|
}
|
|
|
|
static int apply_fragments(struct buffer_desc *desc, struct patch *patch)
|
|
{
|
|
struct fragment *frag = patch->fragments;
|
|
|
|
while (frag) {
|
|
if (apply_one_fragment(desc, frag) < 0)
|
|
return error("patch failed: %s:%d", patch->old_name, frag->oldpos);
|
|
frag = frag->next;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int apply_data(struct patch *patch, struct stat *st)
|
|
{
|
|
char *buf;
|
|
unsigned long size, alloc;
|
|
struct buffer_desc desc;
|
|
|
|
size = 0;
|
|
alloc = 0;
|
|
buf = NULL;
|
|
if (patch->old_name) {
|
|
size = st->st_size;
|
|
alloc = size + 8192;
|
|
buf = xmalloc(alloc);
|
|
if (read_old_data(st, patch->old_name, buf, alloc) != size)
|
|
return error("read of %s failed", patch->old_name);
|
|
}
|
|
|
|
desc.size = size;
|
|
desc.alloc = alloc;
|
|
desc.buffer = buf;
|
|
if (apply_fragments(&desc, patch) < 0)
|
|
return -1;
|
|
patch->result = desc.buffer;
|
|
patch->resultsize = desc.size;
|
|
|
|
if (patch->is_delete && patch->resultsize)
|
|
return error("removal patch leaves file contents");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int check_patch(struct patch *patch)
|
|
{
|
|
struct stat st;
|
|
const char *old_name = patch->old_name;
|
|
const char *new_name = patch->new_name;
|
|
|
|
if (old_name) {
|
|
int changed;
|
|
|
|
if (lstat(old_name, &st) < 0)
|
|
return error("%s: %s\n", strerror(errno));
|
|
if (check_index) {
|
|
int pos = cache_name_pos(old_name, strlen(old_name));
|
|
if (pos < 0)
|
|
return error("%s: does not exist in index", old_name);
|
|
changed = ce_match_stat(active_cache[pos], &st);
|
|
if (changed)
|
|
return error("%s: does not match index", old_name);
|
|
}
|
|
if (patch->is_new < 0)
|
|
patch->is_new = 0;
|
|
if (!patch->old_mode)
|
|
patch->old_mode = st.st_mode;
|
|
if ((st.st_mode ^ patch->old_mode) & S_IFMT)
|
|
return error("%s: wrong type", old_name);
|
|
if (st.st_mode != patch->old_mode)
|
|
fprintf(stderr, "warning: %s has type %o, expected %o\n",
|
|
old_name, st.st_mode, patch->old_mode);
|
|
}
|
|
|
|
if (new_name && (patch->is_new | patch->is_rename | patch->is_copy)) {
|
|
if (check_index && cache_name_pos(new_name, strlen(new_name)) >= 0)
|
|
return error("%s: already exists in index", new_name);
|
|
if (!lstat(new_name, &st))
|
|
return error("%s: already exists in working directory", new_name);
|
|
if (errno != ENOENT)
|
|
return error("%s: %s", new_name, strerror(errno));
|
|
if (!patch->new_mode)
|
|
patch->new_mode = S_IFREG | 0644;
|
|
}
|
|
|
|
if (new_name && old_name) {
|
|
int same = !strcmp(old_name, new_name);
|
|
if (!patch->new_mode)
|
|
patch->new_mode = patch->old_mode;
|
|
if ((patch->old_mode ^ patch->new_mode) & S_IFMT)
|
|
return error("new mode (%o) of %s does not match old mode (%o)%s%s",
|
|
patch->new_mode, new_name, patch->old_mode,
|
|
same ? "" : " of ", same ? "" : old_name);
|
|
}
|
|
|
|
if (apply_data(patch, &st) < 0)
|
|
return error("%s: patch does not apply", old_name);
|
|
return 0;
|
|
}
|
|
|
|
static int check_patch_list(struct patch *patch)
|
|
{
|
|
int error = 0;
|
|
|
|
for (;patch ; patch = patch->next)
|
|
error |= check_patch(patch);
|
|
return error;
|
|
}
|
|
|
|
static void show_file(int c, unsigned int mode, const char *name)
|
|
{
|
|
printf("%c %o %s\n", c, mode, name);
|
|
}
|
|
|
|
static void show_file_list(struct patch *patch)
|
|
{
|
|
for (;patch ; patch = patch->next) {
|
|
if (patch->is_rename) {
|
|
show_file('-', patch->old_mode, patch->old_name);
|
|
show_file('+', patch->new_mode, patch->new_name);
|
|
continue;
|
|
}
|
|
if (patch->is_copy || patch->is_new) {
|
|
show_file('+', patch->new_mode, patch->new_name);
|
|
continue;
|
|
}
|
|
if (patch->is_delete) {
|
|
show_file('-', patch->old_mode, patch->old_name);
|
|
continue;
|
|
}
|
|
if (patch->old_mode && patch->new_mode && patch->old_mode != patch->new_mode) {
|
|
printf("M %o:%o %s\n", patch->old_mode, patch->new_mode, patch->old_name);
|
|
continue;
|
|
}
|
|
printf("M %o %s\n", patch->old_mode, patch->old_name);
|
|
}
|
|
}
|
|
|
|
static void stat_patch_list(struct patch *patch)
|
|
{
|
|
int files, adds, dels;
|
|
|
|
for (files = adds = dels = 0 ; patch ; patch = patch->next) {
|
|
files++;
|
|
adds += patch->lines_added;
|
|
dels += patch->lines_deleted;
|
|
show_stats(patch);
|
|
}
|
|
|
|
printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
|
|
}
|
|
|
|
static void patch_stats(struct patch *patch)
|
|
{
|
|
int lines = patch->lines_added + patch->lines_deleted;
|
|
|
|
if (lines > max_change)
|
|
max_change = lines;
|
|
if (patch->old_name) {
|
|
int len = strlen(patch->old_name);
|
|
if (len > max_len)
|
|
max_len = len;
|
|
}
|
|
if (patch->new_name) {
|
|
int len = strlen(patch->new_name);
|
|
if (len > max_len)
|
|
max_len = len;
|
|
}
|
|
}
|
|
|
|
static void remove_file(struct patch *patch)
|
|
{
|
|
if (write_index) {
|
|
if (remove_file_from_cache(patch->old_name) < 0)
|
|
die("unable to remove %s from index", patch->old_name);
|
|
}
|
|
unlink(patch->old_name);
|
|
}
|
|
|
|
static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size)
|
|
{
|
|
struct stat st;
|
|
struct cache_entry *ce;
|
|
int namelen = strlen(path);
|
|
unsigned ce_size = cache_entry_size(namelen);
|
|
|
|
if (!write_index)
|
|
return;
|
|
|
|
ce = xmalloc(ce_size);
|
|
memset(ce, 0, ce_size);
|
|
memcpy(ce->name, path, namelen);
|
|
ce->ce_mode = create_ce_mode(mode);
|
|
ce->ce_flags = htons(namelen);
|
|
if (lstat(path, &st) < 0)
|
|
die("unable to stat newly created file %s", path);
|
|
fill_stat_cache_info(ce, &st);
|
|
if (write_sha1_file(buf, size, "blob", ce->sha1) < 0)
|
|
die("unable to create backing store for newly created file %s", path);
|
|
if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
|
|
die("unable to add cache entry for %s", path);
|
|
}
|
|
|
|
static void create_file(struct patch *patch)
|
|
{
|
|
const char *path = patch->new_name;
|
|
unsigned mode = patch->new_mode;
|
|
unsigned long size = patch->resultsize;
|
|
char *buf = patch->result;
|
|
|
|
if (!mode)
|
|
mode = S_IFREG | 0644;
|
|
if (S_ISREG(mode)) {
|
|
int fd;
|
|
mode = (mode & 0100) ? 0777 : 0666;
|
|
fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
|
|
if (fd < 0)
|
|
die("unable to create file %s (%s)", path, strerror(errno));
|
|
if (write(fd, buf, size) != size)
|
|
die("unable to write file %s", path);
|
|
close(fd);
|
|
add_index_file(path, mode, buf, size);
|
|
return;
|
|
}
|
|
if (S_ISLNK(mode)) {
|
|
if (size && buf[size-1] == '\n')
|
|
size--;
|
|
buf[size] = 0;
|
|
if (symlink(buf, path) < 0)
|
|
die("unable to write symlink %s", path);
|
|
add_index_file(path, mode, buf, size);
|
|
return;
|
|
}
|
|
die("unable to write file mode %o", mode);
|
|
}
|
|
|
|
static void write_out_one_result(struct patch *patch)
|
|
{
|
|
if (patch->is_delete > 0) {
|
|
remove_file(patch);
|
|
return;
|
|
}
|
|
if (patch->is_new > 0 || patch->is_copy) {
|
|
create_file(patch);
|
|
return;
|
|
}
|
|
/*
|
|
* Rename or modification boils down to the same
|
|
* thing: remove the old, write the new
|
|
*/
|
|
remove_file(patch);
|
|
create_file(patch);
|
|
}
|
|
|
|
static void write_out_results(struct patch *list)
|
|
{
|
|
if (!list)
|
|
die("No changes");
|
|
|
|
while (list) {
|
|
write_out_one_result(list);
|
|
list = list->next;
|
|
}
|
|
}
|
|
|
|
static struct cache_file cache_file;
|
|
|
|
static int apply_patch(int fd)
|
|
{
|
|
int newfd;
|
|
unsigned long offset, size;
|
|
char *buffer = read_patch_file(fd, &size);
|
|
struct patch *list = NULL, **listp = &list;
|
|
|
|
if (!buffer)
|
|
return -1;
|
|
offset = 0;
|
|
while (size > 0) {
|
|
struct patch *patch;
|
|
int nr;
|
|
|
|
patch = xmalloc(sizeof(*patch));
|
|
memset(patch, 0, sizeof(*patch));
|
|
nr = parse_chunk(buffer + offset, size, patch);
|
|
if (nr < 0)
|
|
break;
|
|
patch_stats(patch);
|
|
*listp = patch;
|
|
listp = &patch->next;
|
|
offset += nr;
|
|
size -= nr;
|
|
}
|
|
|
|
newfd = -1;
|
|
write_index = check_index && apply;
|
|
if (write_index)
|
|
newfd = hold_index_file_for_update(&cache_file, get_index_file());
|
|
if (check_index) {
|
|
if (read_cache() < 0)
|
|
die("unable to read index file");
|
|
}
|
|
|
|
if ((check || apply) && check_patch_list(list) < 0)
|
|
exit(1);
|
|
|
|
if (apply)
|
|
write_out_results(list);
|
|
|
|
if (write_index) {
|
|
if (write_cache(newfd, active_cache, active_nr) ||
|
|
commit_index_file(&cache_file))
|
|
die("Unable to write new cachefile");
|
|
}
|
|
|
|
if (show_files)
|
|
show_file_list(list);
|
|
|
|
if (diffstat)
|
|
stat_patch_list(list);
|
|
|
|
free(buffer);
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int i;
|
|
int read_stdin = 1;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
int fd;
|
|
|
|
if (!strcmp(arg, "-")) {
|
|
apply_patch(0);
|
|
read_stdin = 0;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--no-merge")) {
|
|
merge_patch = 0;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--stat")) {
|
|
apply = 0;
|
|
diffstat = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--check")) {
|
|
apply = 0;
|
|
check = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--index")) {
|
|
check_index = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--show-files")) {
|
|
show_files = 1;
|
|
continue;
|
|
}
|
|
fd = open(arg, O_RDONLY);
|
|
if (fd < 0)
|
|
usage(apply_usage);
|
|
read_stdin = 0;
|
|
apply_patch(fd);
|
|
close(fd);
|
|
}
|
|
if (read_stdin)
|
|
apply_patch(0);
|
|
return 0;
|
|
}
|