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/* See LICENSE file for copyright and license details. */
#include "common.h"
static size_t
hunk_head(const char *text, size_t len, size_t *first, size_t *count)
{
size_t off = 1, r;
off += r = libpatch_get_zu__(&text[off], len - off, first);
if (!r)
return 0;
if (off < len && text[off] == ' ') {
off += 1;
off += r = libpatch_get_zu__(&text[off], len - off, count);
if (!r)
return 0;
} else {
*count = 1;
}
return off;
}
int
libpatch_parse_rcs_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, line, count = 0;
int has_patch = 0;
while ((len = libpatch_next_line__(&text, &textlen, len))) {
if (count) {
count -= 1;
APPEND_STRING(0, LIBPATCH_PATCH_FILE2_ONLY);
(*patch)[*patchlen - 1].file1_lineno = line;
} else if (len >= 5 && !strncmp(text, "diff ", 5)) {
if (has_patch && textend)
break;
APPEND_STRING(5, LIBPATCH_PATCH_DIFF_LINE);
} else if (len >= 2 && text[0] == 'd' && isdigit(text[1])) {
if (hunk_head(text, len, &line, &count) < len)
goto garbage;
APPEND_NO_TEXT(LIBPATCH_PATCH_HUNK_WITH_DELETION);
(*patch)[*patchlen - 1].first_line = line;
(*patch)[*patchlen - 1].line_count = count;
has_patch = 1;
} else if (len >= 2 && text[0] == 'a' && isdigit(text[1])) {
if (hunk_head(text, len, &line, &count) < len)
goto garbage;
APPEND_NO_TEXT(LIBPATCH_PATCH_HUNK);
line += 1;
has_patch = 1;
} 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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