diff options
Diffstat (limited to 'builtin/apply.c')
| -rw-r--r-- | builtin/apply.c | 53 |
1 files changed, 51 insertions, 2 deletions
diff --git a/builtin/apply.c b/builtin/apply.c index 9d00069158..f27f80ed76 100644 --- a/builtin/apply.c +++ b/builtin/apply.c @@ -151,6 +151,10 @@ struct fragment { 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; @@ -332,6 +336,11 @@ static void add_line_info(struct image *img, const char *bol, size_t len, unsign 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) { @@ -1607,6 +1616,14 @@ static int parse_fragment(const char *line, unsigned long size, return offset; } +/* + * 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; @@ -1700,6 +1717,11 @@ static char *inflate_it(const void *data, unsigned long size, 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, @@ -1853,6 +1875,13 @@ static int parse_binary(char *buffer, unsigned long size, struct patch *patch) 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; @@ -2413,6 +2442,11 @@ static void remove_last_line(struct image *img) 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, @@ -2484,6 +2518,11 @@ static void update_image(struct image *img, 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) @@ -2774,6 +2813,12 @@ static int apply_binary_fragment(struct image *img, struct patch *patch) 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; @@ -2981,7 +3026,7 @@ static int apply_data(struct patch *patch, struct stat *st, struct cache_entry * 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)) @@ -3139,6 +3184,10 @@ static int check_preimage(struct patch *patch, struct cache_entry **ce, struct s 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; @@ -3726,7 +3775,7 @@ static void prefix_patches(struct patch *p) 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; |