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/* 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;
}
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