* uses the working tree as a "branch" for a 3-way merge.
*/
#include <ctype.h>
-
+#include <fnmatch.h>
#include "cache.h"
// We default to the merge behaviour, since that's what most people would
-// expect
+// 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 const char apply_usage[] = "git-apply <patch>";
+static int check_index = 0;
+static int write_index = 0;
+static int diffstat = 0;
+static int summary = 0;
+static int check = 0;
+static int apply = 1;
+static int show_files = 0;
+static const char apply_usage[] =
+"git-apply [--no-merge] [--stat] [--summary] [--check] [--index] [--apply] [--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;
+ int score;
+ 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)
{
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(char *buffer, unsigned long size)
+static unsigned long linelen(const char *buffer, unsigned long size)
{
unsigned long len = 0;
while (size--) {
return len;
}
-static int match_word(const char *line, const char *match)
+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 = *match++;
- if (!c)
+ char c = *line++;
+ if (c == '\n')
break;
- if (*line++ != c)
- return 0;
+ if (c != '/')
+ continue;
+absolute_path:
+ if (memcmp(line, name, len) || line[len] != '\n')
+ break;
+ return orig_name;
}
- return *line == ' ';
+ 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)
+{
+ if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
+ patch->score = 0;
+ return 0;
+}
+
+static int gitdiff_dissimilarity(const char *line, struct patch *patch)
+{
+ if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
+ patch->score = 0;
+ 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, unsigned int size)
+static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
{
- unsigned long offset, len;
+ 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;
- for (offset = 0 ; size > 0 ; offset += len, size -= len, line += len) {
len = linelen(line, size);
- if (!len)
+ if (!len || line[len-1] != '\n')
break;
- if (line[len-1] != '\n')
- return -1;
- if (len < 4)
+ 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;
- if (!memcmp(line, "@@ -", 4))
- return offset;
- if (match_word(line, "new file mode"))
- continue;
- if (match_word(line, "deleted file mode"))
- continue;
- if (match_word(line, "copy"))
- continue;
- if (match_word(line, "rename"))
- continue;
- if (match_word(line, "similarity index"))
- continue;
- 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;
}
- /* We want either a patch _or_ something real */
- return offset ? :-1;
+ ex = strlen(expect);
+ if (ex > len)
+ return -1;
+ if (memcmp(line, expect, ex))
+ return -1;
+
+ return offset + ex;
}
-static int find_header(char *line, unsigned long size, int *hdrsize)
+/*
+ * 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;
- for (offset = 0; size > 0; offset += len, size -= len, line += 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);
/* 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, (int)len-1, line);
+ }
+
if (size < len + 6)
break;
* or mode change, so we handle that specially
*/
if (!memcmp("diff --git ", line, 11)) {
- int git_hdr_len = parse_git_header(line + len, size - len);
- if (git_hdr_len < 0)
+ int git_hdr_len = parse_git_header(line, len, size, patch);
+ if (git_hdr_len <= len)
continue;
-
- *hdrsize = len + git_hdr_len;
+ if (!patch->old_name && !patch->new_name) {
+ if (!patch->def_name)
+ die("git diff header lacks filename information (line %d)", linenr);
+ patch->old_name = patch->new_name = patch->def_name;
+ }
+ *hdrsize = git_hdr_len;
return offset;
}
continue;
/* Ok, we'll consider it a patch */
+ parse_traditional_patch(line, line+len, patch);
*hdrsize = len + nextlen;
+ linenr += 2;
return offset;
}
return -1;
}
-static int parse_num(const char *line, int len, int offset, const char *expect, unsigned long *p)
-{
- char *ptr;
- int digits, ex;
-
- if (offset < 0 || offset >= len)
- return -1;
- line += offset;
- len -= offset;
-
- if (!isdigit(*line))
- return -1;
- *p = strtoul(line, &ptr, 10);
-
- digits = ptr - line;
-
- offset += digits;
- line += digits;
- len -= digits;
-
- ex = strlen(expect);
- if (ex > len)
- return -1;
- if (memcmp(line, expect, ex))
- return -1;
-
- return offset + ex;
-}
-
/*
* Parse a unified diff. Note that this really needs
* to parse each fragment separately, since the only
* part of a patch, and a "---" that starts the next
* patch is to look at the line counts..
*/
-static int apply_fragment(char *line, unsigned long size)
+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 oldpos, oldlines, newpos, newlines;
-
- if (!len || line[len-1] != '\n')
- return -1;
+ unsigned long oldlines, newlines;
- /* Figure out the number of lines in a fragment */
- offset = parse_num(line, len, 4, ",", &oldpos);
- offset = parse_num(line, len, offset, " +", &oldlines);
- offset = parse_num(line, len, offset, ",", &newpos);
- offset = parse_num(line, len, offset, " @@", &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) {
+ if (newlines)
+ return error("deleted file still has contents");
+ fprintf(stderr, "** warning: file %s becomes empty but is not deleted\n", patch->new_name);
+ }
/* Parse the thing.. */
line += len;
size -= len;
- for (offset = len; size > 0; offset += len, size -= len, line += 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);
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;
}
}
+ /* If a fragment ends with an incomplete line, we failed to include
+ * it in the above loop because we hit oldlines == newlines == 0
+ * before seeing it.
+ */
+ if (12 < size && !memcmp(line, "\\ No newline", 12))
+ offset += linelen(line, size);
+
+ patch->lines_added += added;
+ patch->lines_deleted += deleted;
return offset;
}
-static int apply_single_patch(char *line, unsigned long size)
+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)) {
- int len = apply_fragment(line, size);
+ 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");
+ die("corrupt patch at line %d", linenr);
+
+ fragment->patch = line;
+ fragment->size = len;
-printf("applying fragment:\n%.*s\n\n", len, line);
+ *fragp = fragment;
+ fragp = &fragment->next;
offset += len;
line += len;
return offset;
}
-static int apply_chunk(char *buffer, unsigned long size)
+static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
{
int hdrsize, patchsize;
- int offset = find_header(buffer, size, &hdrsize);
- char *header, *patch;
+ int offset = find_header(buffer, size, &hdrsize, patch);
if (offset < 0)
return offset;
- header = buffer + offset;
-printf("Found header:\n%.*s\n\n", hdrsize, header);
-
- patch = header + hdrsize;
- patchsize = apply_single_patch(patch, size - offset - hdrsize);
+ patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
return offset + hdrsize + patchsize;
}
+static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
+static const char minuses[]= "----------------------------------------------------------------------";
+
+static void show_stats(struct patch *patch)
+{
+ const char *prefix = "";
+ char *name = patch->new_name;
+ int len, max, add, del, total;
+
+ if (!name)
+ name = patch->old_name;
+
+ /*
+ * "scale" the filename
+ */
+ len = strlen(name);
+ max = max_len;
+ if (max > 50)
+ max = 50;
+ if (len > max) {
+ char *slash;
+ prefix = "...";
+ max -= 3;
+ name += len - max;
+ slash = strchr(name, '/');
+ if (slash)
+ name = slash;
+ }
+ 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;
+
+ if (max_change > 0) {
+ total = (total * max + max_change / 2) / max_change;
+ add = (add * max + max_change / 2) / max_change;
+ del = total - add;
+ }
+ printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
+ 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;
+ 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:%ld", 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", old_name, 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;
+ st.st_mode = ntohl(create_ce_mode(st.st_mode));
+ 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) {
+ if (patch->is_new)
+ patch->new_mode = S_IFREG | 0644;
+ else
+ patch->new_mode = patch->old_mode;
+ }
+ }
+
+ 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 show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
+{
+ if (mode)
+ printf(" %s mode %06o %s\n", newdelete, mode, name);
+ else
+ printf(" %s %s\n", newdelete, name);
+}
+
+static void show_mode_change(struct patch *p, int show_name)
+{
+ if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
+ if (show_name)
+ printf(" mode change %06o => %06o %s\n",
+ p->old_mode, p->new_mode, p->new_name);
+ else
+ printf(" mode change %06o => %06o\n",
+ p->old_mode, p->new_mode);
+ }
+}
+
+static void show_rename_copy(struct patch *p)
+{
+ const char *renamecopy = p->is_rename ? "rename" : "copy";
+ const char *old, *new;
+
+ /* Find common prefix */
+ old = p->old_name;
+ new = p->new_name;
+ while (1) {
+ const char *slash_old, *slash_new;
+ slash_old = strchr(old, '/');
+ slash_new = strchr(new, '/');
+ if (!slash_old ||
+ !slash_new ||
+ slash_old - old != slash_new - new ||
+ memcmp(old, new, slash_new - new))
+ break;
+ old = slash_old + 1;
+ new = slash_new + 1;
+ }
+ /* p->old_name thru old is the common prefix, and old and new
+ * through the end of names are renames
+ */
+ if (old != p->old_name)
+ printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
+ (int)(old - p->old_name), p->old_name,
+ old, new, p->score);
+ else
+ printf(" %s %s => %s (%d%%)\n", renamecopy,
+ p->old_name, p->new_name, p->score);
+ show_mode_change(p, 0);
+}
+
+static void summary_patch_list(struct patch *patch)
+{
+ struct patch *p;
+
+ for (p = patch; p; p = p->next) {
+ if (p->is_new)
+ show_file_mode_name("create", p->new_mode, p->new_name);
+ else if (p->is_delete)
+ show_file_mode_name("delete", p->old_mode, p->old_name);
+ else {
+ if (p->is_rename || p->is_copy)
+ show_rename_copy(p);
+ else {
+ if (p->score) {
+ printf(" rewrite %s (%d%%)\n",
+ p->new_name, p->score);
+ show_mode_change(p, 0);
+ }
+ else
+ show_mode_change(p, 1);
+ }
+ }
+ }
+}
+
+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_subdirectories(const char *path)
+{
+ int len = strlen(path);
+ char *buf = xmalloc(len + 1);
+ const char *slash = path;
+
+ while ((slash = strchr(slash+1, '/')) != NULL) {
+ len = slash - path;
+ memcpy(buf, path, len);
+ buf[len] = 0;
+ if (mkdir(buf, 0777) < 0) {
+ if (errno != EEXIST)
+ break;
+ }
+ }
+ free(buf);
+}
+
+static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
+{
+ int fd;
+
+ if (S_ISLNK(mode))
+ return symlink(buf, path);
+ fd = open(path, O_CREAT | O_EXCL | O_WRONLY | O_TRUNC, (mode & 0100) ? 0777 : 0666);
+ if (fd < 0)
+ return -1;
+ while (size) {
+ int written = write(fd, buf, size);
+ if (written < 0) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ die("writing file %s: %s", path, strerror(errno));
+ }
+ if (!written)
+ die("out of space writing file %s", path);
+ buf += written;
+ size -= written;
+ }
+ if (close(fd) < 0)
+ die("closing file %s: %s", path, strerror(errno));
+ return 0;
+}
+
+/*
+ * We optimistically assume that the directories exist,
+ * which is true 99% of the time anyway. If they don't,
+ * we create them and try again.
+ */
+static void create_one_file(const char *path, unsigned mode, const char *buf, unsigned long size)
+{
+ if (!try_create_file(path, mode, buf, size))
+ return;
+
+ if (errno == ENOENT) {
+ create_subdirectories(path);
+ if (!try_create_file(path, mode, buf, size))
+ return;
+ }
+
+ if (errno == EEXIST) {
+ unsigned int nr = getpid();
+
+ for (;;) {
+ const char *newpath;
+ newpath = mkpath("%s~%u", path, nr);
+ if (!try_create_file(newpath, mode, buf, size)) {
+ if (!rename(newpath, path))
+ return;
+ unlink(newpath);
+ break;
+ }
+ if (errno != EEXIST)
+ break;
+ }
+ }
+ die("unable to write file %s mode %o", path, mode);
+}
+
+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;
+ create_one_file(path, mode, buf, size);
+ add_index_file(path, mode, buf, size);
+}
+
+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, int skipped_patch)
+{
+ if (!list && !skipped_patch)
+ die("No changes");
+
+ while (list) {
+ write_out_one_result(list);
+ list = list->next;
+ }
+}
+
+static struct cache_file cache_file;
+
+static struct excludes {
+ struct excludes *next;
+ const char *path;
+} *excludes;
+
+static int use_patch(struct patch *p)
+{
+ const char *pathname = p->new_name ? : p->old_name;
+ struct excludes *x = excludes;
+ while (x) {
+ if (fnmatch(x->path, pathname, 0) == 0)
+ return 0;
+ x = x->next;
+ }
+ return 1;
+}
+
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;
+ int skipped_patch = 0;
if (!buffer)
return -1;
offset = 0;
while (size > 0) {
- int nr = apply_chunk(buffer + offset, size);
+ 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;
+ if (use_patch(patch)) {
+ patch_stats(patch);
+ *listp = patch;
+ listp = &patch->next;
+ } else {
+ /* perhaps free it a bit better? */
+ free(patch);
+ skipped_patch++;
+ }
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, skipped_patch);
+
+ 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);
+
+ if (summary)
+ summary_patch_list(list);
+
free(buffer);
return 0;
}
int main(int argc, char **argv)
{
int i;
-
- if (read_cache() < 0)
- die("unable to read index file");
+ int read_stdin = 1;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "-")) {
apply_patch(0);
+ read_stdin = 0;
continue;
}
+ if (!strncmp(arg, "--exclude=", 10)) {
+ struct excludes *x = xmalloc(sizeof(*x));
+ x->path = arg + 10;
+ x->next = excludes;
+ excludes = x;
+ continue;
+ }
+ /* NEEDSWORK: this does not do anything at this moment. */
if (!strcmp(arg, "--no-merge")) {
merge_patch = 0;
continue;
}
+ if (!strcmp(arg, "--stat")) {
+ apply = 0;
+ diffstat = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--summary")) {
+ apply = 0;
+ summary = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--check")) {
+ apply = 0;
+ check = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--index")) {
+ check_index = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--apply")) {
+ apply = 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;
}