diff options
Diffstat (limited to 'builtin/apply.c')
| -rw-r--r-- | builtin/apply.c | 185 |
1 files changed, 145 insertions, 40 deletions
diff --git a/builtin/apply.c b/builtin/apply.c index 3af4ae0c26..7ca90472c1 100644 --- a/builtin/apply.c +++ b/builtin/apply.c @@ -1854,33 +1854,76 @@ static int match_fragment(struct image *img, { int i; char *fixed_buf, *buf, *orig, *target; + int preimage_limit; - if (preimage->nr + try_lno > img->nr) + if (preimage->nr + try_lno <= img->nr) { + /* + * The hunk falls within the boundaries of img. + */ + preimage_limit = preimage->nr; + if (match_end && (preimage->nr + try_lno != img->nr)) + return 0; + } else if (ws_error_action == correct_ws_error && + (ws_rule & WS_BLANK_AT_EOF) && match_end) { + /* + * This hunk that matches at the end extends beyond + * the end of img, and we are removing blank lines + * at the end of the file. This many lines from the + * beginning of the preimage must match with img, and + * the remainder of the preimage must be blank. + */ + preimage_limit = img->nr - try_lno; + } else { + /* + * The hunk extends beyond the end of the img and + * we are not removing blanks at the end, so we + * should reject the hunk at this position. + */ return 0; + } if (match_beginning && try_lno) return 0; - if (match_end && preimage->nr + try_lno != img->nr) - return 0; - /* Quick hash check */ - for (i = 0; i < preimage->nr; i++) + for (i = 0; i < preimage_limit; i++) if (preimage->line[i].hash != img->line[try_lno + i].hash) return 0; - /* - * Do we have an exact match? If we were told to match - * at the end, size must be exactly at try+fragsize, - * otherwise try+fragsize must be still within the preimage, - * and either case, the old piece should match the preimage - * exactly. - */ - if ((match_end - ? (try + preimage->len == img->len) - : (try + preimage->len <= img->len)) && - !memcmp(img->buf + try, preimage->buf, preimage->len)) - return 1; + if (preimage_limit == preimage->nr) { + /* + * Do we have an exact match? If we were told to match + * at the end, size must be exactly at try+fragsize, + * otherwise try+fragsize must be still within the preimage, + * and either case, the old piece should match the preimage + * exactly. + */ + if ((match_end + ? (try + preimage->len == img->len) + : (try + preimage->len <= img->len)) && + !memcmp(img->buf + try, preimage->buf, preimage->len)) + return 1; + } else { + /* + * The preimage extends beyond the end of img, so + * there cannot be an exact match. + * + * There must be one non-blank context line that match + * a line before the end of img. + */ + char *buf_end; + + buf = preimage->buf; + buf_end = buf; + for (i = 0; i < preimage_limit; i++) + buf_end += preimage->line[i].len; + + for ( ; buf < buf_end; buf++) + if (!isspace(*buf)) + break; + if (buf == buf_end) + return 0; + } /* * No exact match. If we are ignoring whitespace, run a line-by-line @@ -1891,7 +1934,10 @@ static int match_fragment(struct image *img, size_t imgoff = 0; size_t preoff = 0; size_t postlen = postimage->len; - for (i = 0; i < preimage->nr; i++) { + size_t extra_chars; + char *preimage_eof; + char *preimage_end; + for (i = 0; i < preimage_limit; i++) { size_t prelen = preimage->line[i].len; size_t imglen = img->line[try_lno+i].len; @@ -1905,20 +1951,36 @@ static int match_fragment(struct image *img, } /* - * Ok, the preimage matches with whitespace fuzz. Update it and - * the common postimage lines to use the same whitespace as the - * target. imgoff now holds the true length of the target that - * matches the preimage, and we need to update the line lengths - * of the preimage to match the target ones. + * Ok, the preimage matches with whitespace fuzz. + * + * imgoff now holds the true length of the target that + * matches the preimage before the end of the file. + * + * Count the number of characters in the preimage that fall + * beyond the end of the file and make sure that all of them + * are whitespace characters. (This can only happen if + * we are removing blank lines at the end of the file.) */ - fixed_buf = xmalloc(imgoff); - memcpy(fixed_buf, img->buf + try, imgoff); - for (i = 0; i < preimage->nr; i++) - preimage->line[i].len = img->line[try_lno+i].len; + buf = preimage_eof = preimage->buf + preoff; + for ( ; i < preimage->nr; i++) + preoff += preimage->line[i].len; + preimage_end = preimage->buf + preoff; + for ( ; buf < preimage_end; buf++) + if (!isspace(*buf)) + return 0; /* - * Update the preimage buffer and the postimage context lines. + * Update the preimage and the common postimage context + * lines to use the same whitespace as the target. + * If whitespace is missing in the target (i.e. + * if the preimage extends beyond the end of the file), + * use the whitespace from the preimage. */ + extra_chars = preimage_end - preimage_eof; + fixed_buf = xmalloc(imgoff + extra_chars); + memcpy(fixed_buf, img->buf + try, imgoff); + memcpy(fixed_buf + imgoff, preimage_eof, extra_chars); + imgoff += extra_chars; update_pre_post_images(preimage, postimage, fixed_buf, imgoff, postlen); return 1; @@ -1932,12 +1994,16 @@ static int match_fragment(struct image *img, * it might with whitespace fuzz. We haven't been asked to * ignore whitespace, we were asked to correct whitespace * errors, so let's try matching after whitespace correction. + * + * The preimage may extend beyond the end of the file, + * but in this loop we will only handle the part of the + * preimage that falls within the file. */ fixed_buf = xmalloc(preimage->len + 1); buf = fixed_buf; orig = preimage->buf; target = img->buf + try; - for (i = 0; i < preimage->nr; i++) { + for (i = 0; i < preimage_limit; i++) { size_t fixlen; /* length after fixing the preimage */ size_t oldlen = preimage->line[i].len; size_t tgtlen = img->line[try_lno + i].len; @@ -1977,6 +2043,29 @@ static int match_fragment(struct image *img, target += tgtlen; } + + /* + * Now handle the lines in the preimage that falls beyond the + * end of the file (if any). They will only match if they are + * empty or only contain whitespace (if WS_BLANK_AT_EOL is + * false). + */ + for ( ; i < preimage->nr; i++) { + size_t fixlen; /* length after fixing the preimage */ + size_t oldlen = preimage->line[i].len; + int j; + + /* Try fixing the line in the preimage */ + fixlen = ws_fix_copy(buf, orig, oldlen, ws_rule, NULL); + + for (j = 0; j < fixlen; j++) + if (!isspace(buf[j])) + goto unmatch_exit; + + orig += oldlen; + buf += fixlen; + } + /* * Yes, the preimage is based on an older version that still * has whitespace breakages unfixed, and fixing them makes the @@ -2002,9 +2091,6 @@ static int find_pos(struct image *img, unsigned long backwards, forwards, try; int backwards_lno, forwards_lno, try_lno; - if (preimage->nr > img->nr) - return -1; - /* * If match_beginning or match_end is specified, there is no * point starting from a wrong line that will never match and @@ -2015,7 +2101,12 @@ static int find_pos(struct image *img, else if (match_end) line = img->nr - preimage->nr; - if (line > img->nr) + /* + * Because the comparison is unsigned, the following test + * will also take care of a negative line number that can + * result when match_end and preimage is larger than the target. + */ + if ((size_t) line > img->nr) line = img->nr; try = 0; @@ -2091,12 +2182,26 @@ static void update_image(struct image *img, int i, nr; size_t remove_count, insert_count, applied_at = 0; char *result; + int preimage_limit; + + /* + * If we are removing blank lines at the end of img, + * the preimage may extend beyond the end. + * If that is the case, we must be careful only to + * remove the part of the preimage that falls within + * the boundaries of img. Initialize preimage_limit + * to the number of lines in the preimage that falls + * within the boundaries. + */ + preimage_limit = preimage->nr; + if (preimage_limit > img->nr - applied_pos) + preimage_limit = img->nr - applied_pos; for (i = 0; i < applied_pos; i++) applied_at += img->line[i].len; remove_count = 0; - for (i = 0; i < preimage->nr; i++) + for (i = 0; i < preimage_limit; i++) remove_count += img->line[applied_pos + i].len; insert_count = postimage->len; @@ -2113,8 +2218,8 @@ static void update_image(struct image *img, result[img->len] = '\0'; /* Adjust the line table */ - nr = img->nr + postimage->nr - preimage->nr; - if (preimage->nr < postimage->nr) { + nr = img->nr + postimage->nr - preimage_limit; + if (preimage_limit < postimage->nr) { /* * NOTE: this knows that we never call remove_first_line() * on anything other than pre/post image. @@ -2122,10 +2227,10 @@ static void update_image(struct image *img, img->line = xrealloc(img->line, nr * sizeof(*img->line)); img->line_allocated = img->line; } - if (preimage->nr != postimage->nr) + if (preimage_limit != postimage->nr) memmove(img->line + applied_pos + postimage->nr, - img->line + applied_pos + preimage->nr, - (img->nr - (applied_pos + preimage->nr)) * + img->line + applied_pos + preimage_limit, + (img->nr - (applied_pos + preimage_limit)) * sizeof(*img->line)); memcpy(img->line + applied_pos, postimage->line, @@ -2321,7 +2426,7 @@ static int apply_one_fragment(struct image *img, struct fragment *frag, if (applied_pos >= 0) { if (new_blank_lines_at_end && - preimage.nr + applied_pos == img->nr && + preimage.nr + applied_pos >= img->nr && (ws_rule & WS_BLANK_AT_EOF) && ws_error_action != nowarn_ws_error) { record_ws_error(WS_BLANK_AT_EOF, "+", 1, frag->linenr); |