#include "builtin.h"
#include "string-list.h"
#include "dir.h"
+#include "diff.h"
#include "parse-options.h"
/*
unsigned long leading, trailing;
unsigned long oldpos, oldlines;
unsigned long newpos, newlines;
+ /*
+ * 'patch' is usually borrowed from buf in apply_patch(),
+ * but some codepaths store an allocated buffer.
+ */
const char *patch;
unsigned free_patch:1,
rejected:1;
struct patch *next;
};
+static void free_fragment_list(struct fragment *list)
+{
+ while (list) {
+ struct fragment *next = list->next;
+ if (list->free_patch)
+ free((char *)list->patch);
+ free(list);
+ list = next;
+ }
+}
+
static void free_patch(struct patch *patch)
{
- while (patch) {
- struct patch *patch_next = patch->next;
- struct fragment *fragment = patch->fragments;
-
- while (fragment) {
- struct fragment *fragment_next = fragment->next;
- if (fragment->patch != NULL && fragment->free_patch)
- free((char *)fragment->patch);
- free(fragment);
- fragment = fragment_next;
- }
- free(patch);
- patch = patch_next;
+ free_fragment_list(patch->fragments);
+ free(patch->def_name);
+ free(patch->old_name);
+ free(patch->new_name);
+ free(patch->result);
+ free(patch);
+}
+
+static void free_patch_list(struct patch *list)
+{
+ while (list) {
+ struct patch *next = list->next;
+ free_patch(list);
+ list = next;
}
}
img->nr++;
}
+/*
+ * "buf" has the file contents to be patched (read from various sources).
+ * attach it to "image" and add line-based index to it.
+ * "image" now owns the "buf".
+ */
static void prepare_image(struct image *image, char *buf, size_t len,
int prepare_linetable)
{
fputs(post, output);
}
-#define CHUNKSIZE (8192)
#define SLOP (16)
static void read_patch_file(struct strbuf *sb, int fd)
return name;
}
-static char *find_name_gnu(const char *line, char *def, int p_value)
+static char *find_name_gnu(const char *line, const char *def, int p_value)
{
struct strbuf name = STRBUF_INIT;
char *cp;
cp++;
}
- /* name can later be freed, so we need
- * to memmove, not just return cp
- */
strbuf_remove(&name, 0, cp - name.buf);
- free(def);
if (root)
strbuf_insert(&name, 0, root, root_len);
return squash_slash(strbuf_detach(&name, NULL));
return line + len - end;
}
-static char *find_name_common(const char *line, char *def, int p_value,
- const char *end, int terminate)
+static char *null_strdup(const char *s)
+{
+ return s ? xstrdup(s) : NULL;
+}
+
+static char *find_name_common(const char *line, const char *def,
+ int p_value, const char *end, int terminate)
{
int len;
const char *start = NULL;
start = line;
}
if (!start)
- return squash_slash(def);
+ return squash_slash(null_strdup(def));
len = line - start;
if (!len)
- return squash_slash(def);
+ return squash_slash(null_strdup(def));
/*
* Generally we prefer the shorter name, especially
if (def) {
int deflen = strlen(def);
if (deflen < len && !strncmp(start, def, deflen))
- return squash_slash(def);
- free(def);
+ return squash_slash(xstrdup(def));
}
if (root) {
name = find_name_traditional(first, NULL, p_value);
patch->old_name = name;
} else {
- name = find_name_traditional(first, NULL, p_value);
- name = find_name_traditional(second, name, p_value);
+ char *first_name;
+ first_name = find_name_traditional(first, NULL, p_value);
+ name = find_name_traditional(second, first_name, p_value);
+ free(first_name);
if (has_epoch_timestamp(first)) {
patch->is_new = 1;
patch->is_delete = 0;
patch->is_delete = 1;
patch->old_name = name;
} else {
- patch->old_name = patch->new_name = name;
+ patch->old_name = name;
+ patch->new_name = xstrdup(name);
}
}
if (!name)
static int gitdiff_oldname(const char *line, struct patch *patch)
{
+ char *orig = patch->old_name;
patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
+ if (orig != patch->old_name)
+ free(orig);
return 0;
}
static int gitdiff_newname(const char *line, struct patch *patch)
{
+ char *orig = patch->new_name;
patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
+ if (orig != patch->new_name)
+ free(orig);
return 0;
}
static int gitdiff_delete(const char *line, struct patch *patch)
{
patch->is_delete = 1;
- patch->old_name = patch->def_name;
+ free(patch->old_name);
+ patch->old_name = null_strdup(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;
+ free(patch->new_name);
+ patch->new_name = null_strdup(patch->def_name);
return gitdiff_newmode(line, patch);
}
static int gitdiff_copysrc(const char *line, struct patch *patch)
{
patch->is_copy = 1;
+ free(patch->old_name);
patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
static int gitdiff_copydst(const char *line, struct patch *patch)
{
patch->is_copy = 1;
+ free(patch->new_name);
patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
static int gitdiff_renamesrc(const char *line, struct patch *patch)
{
patch->is_rename = 1;
+ free(patch->old_name);
patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
static int gitdiff_renamedst(const char *line, struct patch *patch)
{
patch->is_rename = 1;
+ free(patch->new_name);
patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
return 0;
}
* creation or deletion of an empty file. In any of these cases,
* both sides are the same name under a/ and b/ respectively.
*/
-static char *git_header_name(char *line, int llen)
+static char *git_header_name(const char *line, int llen)
{
const char *name;
const char *second = 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)
+static int parse_git_header(const char *line, int len, unsigned int size, struct patch *patch)
{
unsigned long offset;
return offset + ex;
}
-static void recount_diff(char *line, int size, struct fragment *fragment)
+static void recount_diff(const char *line, int size, struct fragment *fragment)
{
int oldlines = 0, newlines = 0, ret = 0;
* 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)
+static int parse_fragment_header(const char *line, int len, struct fragment *fragment)
{
int offset;
return offset;
}
-static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
+static int find_header(const char *line, unsigned long size, int *hdrsize, struct patch *patch)
{
unsigned long offset, len;
if (!patch->def_name)
die("git diff header lacks filename information when removing "
"%d leading pathname components (line %d)" , p_value, linenr);
- patch->old_name = patch->new_name = patch->def_name;
+ patch->old_name = xstrdup(patch->def_name);
+ patch->new_name = xstrdup(patch->def_name);
}
if (!patch->is_delete && !patch->new_name)
die("git diff header lacks filename information "
* 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,
+static int parse_fragment(const char *line, unsigned long size,
struct patch *patch, struct fragment *fragment)
{
int added, deleted;
return offset;
}
-static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
+/*
+ * We have seen "diff --git a/... b/..." header (or a traditional patch
+ * header). Read hunks that belong to this patch into fragments and hang
+ * them to the given patch structure.
+ *
+ * The (fragment->patch, fragment->size) pair points into the memory given
+ * by the caller, not a copy, when we return.
+ */
+static int parse_single_patch(const char *line, unsigned long size, struct patch *patch)
{
unsigned long offset = 0;
unsigned long oldlines = 0, newlines = 0, context = 0;
return out;
}
+/*
+ * Read a binary hunk and return a new fragment; fragment->patch
+ * points at an allocated memory that the caller must free, so
+ * it is marked as "->free_patch = 1".
+ */
static struct fragment *parse_binary_hunk(char **buf_p,
unsigned long *sz_p,
int *status_p,
return used;
}
+/*
+ * Read the patch text in "buffer" taht extends for "size" bytes; stop
+ * reading after seeing a single patch (i.e. changes to a single file).
+ * Create fragments (i.e. patch hunks) and hang them to the given patch.
+ * Return the number of bytes consumed, so that the caller can call us
+ * again for the next patch.
+ */
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
{
int hdrsize, patchsize;
img->len -= img->line[--img->nr].len;
}
+/*
+ * The change from "preimage" and "postimage" has been found to
+ * apply at applied_pos (counts in line numbers) in "img".
+ * Update "img" to remove "preimage" and replace it with "postimage".
+ */
static void update_image(struct image *img,
int applied_pos,
struct image *preimage,
img->nr = nr;
}
+/*
+ * Use the patch-hunk text in "frag" to prepare two images (preimage and
+ * postimage) for the hunk. Find lines that match "preimage" in "img" and
+ * replace the part of "img" with "postimage" text.
+ */
static int apply_one_fragment(struct image *img, struct fragment *frag,
int inaccurate_eof, unsigned ws_rule,
int nth_fragment)
return -1;
}
+/*
+ * Replace "img" with the result of applying the binary patch.
+ * The binary patch data itself in patch->fragment is still kept
+ * but the preimage prepared by the caller in "img" is freed here
+ * or in the helper function apply_binary_fragment() this calls.
+ */
static int apply_binary(struct image *img, struct patch *patch)
{
const char *name = patch->old_name ? patch->old_name : patch->new_name;
return error("patch %s has been renamed/deleted",
patch->old_name);
}
- /* We have a patched copy in memory use that */
+ /* We have a patched copy in memory; use that. */
strbuf_add(&buf, tpatch->result, tpatch->resultsize);
} else if (cached) {
if (read_file_or_gitlink(ce, &buf))
/*
* There is no way to apply subproject
* patch without looking at the index.
+ * NEEDSWORK: shouldn't this be flagged
+ * as an error???
*/
+ free_fragment_list(patch->fragments);
patch->fragments = NULL;
}
} else {
is_new:
patch->is_new = 1;
patch->is_delete = 0;
+ free(patch->old_name);
patch->old_name = NULL;
return 0;
}
+/*
+ * Check and apply the patch in-core; leave the result in patch->result
+ * for the caller to write it out to the final destination.
+ */
static int check_patch(struct patch *patch)
{
struct stat st;
show_stats(patch);
}
- printf(" %d files changed, %d insertions(+), %d deletions(-)\n", files, adds, dels);
+ print_stat_summary(stdout, files, adds, dels);
}
static void numstat_patch_list(struct patch *patch)
if (!prefix || p->is_toplevel_relative)
return;
for ( ; p; p = p->next) {
- if (p->new_name == p->old_name) {
- char *prefixed = p->new_name;
- prefix_one(&prefixed);
- p->new_name = p->old_name = prefixed;
- }
- else {
- prefix_one(&p->new_name);
- prefix_one(&p->old_name);
- }
+ prefix_one(&p->new_name);
+ prefix_one(&p->old_name);
}
}
static int apply_patch(int fd, const char *filename, int options)
{
size_t offset;
- struct strbuf buf = STRBUF_INIT;
+ struct strbuf buf = STRBUF_INIT; /* owns the patch text */
struct patch *list = NULL, **listp = &list;
int skipped_patch = 0;
- memset(&fn_table, 0, sizeof(struct string_list));
patch_input_file = filename;
read_patch_file(&buf, fd);
offset = 0;
if (summary)
summary_patch_list(list);
- free_patch(list);
+ free_patch_list(list);
strbuf_release(&buf);
+ string_list_clear(&fn_table, 0);
return 0;
}