diff options
Diffstat (limited to 'libpatch_parse_unified_patch.c')
-rw-r--r-- | libpatch_parse_unified_patch.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/libpatch_parse_unified_patch.c b/libpatch_parse_unified_patch.c new file mode 100644 index 0000000..d92d419 --- /dev/null +++ b/libpatch_parse_unified_patch.c @@ -0,0 +1,111 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +static size_t +hunk_head_part(const char *text, size_t len, size_t *first, size_t *count) +{ + size_t off, r; + off = libpatch_get_zu__(&text[off], len - off, first); + if (!off) + return 0; + if (off < len && text[off] == ',') { + off += 1; + off += r = libpatch_get_zu__(&text[off], len - off, count); + if (!r) + return 0; + } else if (*count) { + *count = 1; + } + return off; +} + + +int +libpatch_parse_unified_patch(const char *text, size_t textlen, size_t *textend, + struct libpatch_patch **patch, size_t *patchlen) +{ + const char *patchtext = text; + size_t len = 0, size = 0, off, r, lineno1, lineno2, count1, count2; + int in_hunk = 0, has_patch = 0; + + *patch = NULL; + *patchlen = 0; + + while ((len = libpatch_next_line__(&text, &textlen, len))) { + if (len >= 5 && !strncmp(text, "diff ", 5)) { + if (has_patch && textend) + break; + APPEND_STRING(5, LIBPATCH_PATCH_DIFF_LINE); + in_hunk = 0; + + } else if (len >= 4 && !strncmp(text, "@@ -", 4)) { + off = 4; + off += r = hunk_head_part(&text[off], len - off, &lineno1, &count1); + if (!r || 2 >= len - off || strncmp(&text[off], " +", 2)) + goto garbage; + off += 2; + off += r = hunk_head_part(&text[off], len - off, &lineno2, &count2); + if (!r || 3 > len - off || strncmp(&text[off], " @@", 3)) + goto garbage; + off += 3; + APPEND_OPTSTRING(off, LIBPATCH_PATCH_HUNK); + in_hunk = ((count1 ? 1 : 0) | (count2 ? 2 : 0)); + has_patch = 1; + + } else if (!in_hunk && len >= 3 && !strncmp(text, "---", 3)) { + APPEND_OPTSTRING(3, LIBPATCH_PATCH_FILE1_LABEL); + (*patch)[*patchlen - 1].lf_terminated = 0; + + } else if (!in_hunk && len >= 3 && !strncmp(text, "+++", 3)) { + APPEND_OPTSTRING(3, LIBPATCH_PATCH_FILE2_LABEL); + (*patch)[*patchlen - 1].lf_terminated = 0; + has_patch = 1; + + } else if ((in_hunk & 1) && len >= 1 && text[0] == '-') { + APPEND_OPTSTRING(1, LIBPATCH_PATCH_FILE1_ONLY); + if (!--count1) + in_hunk ^= 1; + (*patch)[*patchlen - 1].file1_lineno = lineno1++; + + } else if ((in_hunk & 2) && len >= 1 && text[0] == '+') { + APPEND_OPTSTRING(1, LIBPATCH_PATCH_FILE2_ONLY); + if (!--count2) + in_hunk ^= 2; + (*patch)[*patchlen - 1].file2_lineno = lineno2++; + + } else if (in_hunk == 3 && len >= 1 && text[0] == ' ') { + APPEND_OPTSTRING(1, LIBPATCH_PATCH_CONTEXT); + if (!--count1) + in_hunk ^= 1; + if (!--count2) + in_hunk ^= 2; + (*patch)[*patchlen - 1].file1_lineno = lineno1++; + (*patch)[*patchlen - 1].file2_lineno = lineno2++; + + } else if (len >= 1 && !strncmp(text, "\\", 1) && *patchlen) { + if (IS_LINE((*patch)[*patchlen - 1].type) || + !(*patch)[*patchlen - 1].lf_terminated) + goto garbage; + (*patch)[*patchlen - 1].lf_terminated = 0; + APPEND_NO_TEXT(LIBPATCH_PATCH_SYNTACTICAL); + + } else { + garbage: + APPEND_STRING(0, LIBPATCH_PATCH_GARBAGE); + if (len == textlen) + (*patch)[*patchlen - 1].lf_terminated = 0; + } + } + + if (textend) + *textend = (size_t)(text - patchtext); + + return 0; + +fail: + free(*patch); + *patch = NULL; + *patchlen = 0; + return -1; +} |