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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 *last)
{
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, last);
if (!r)
return 0;
} else {
*last = *first;
}
return off;
}
int
libpatch_parse_ed_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, line, last, count;
int in_hunk = 0, can_continue = 0, has_patch = 0;
size_t *hunks = NULL, *new;
size_t nhunks = 0, hunks_size = 0;
struct libpatch_patch *patchcopy = NULL;
size_t patchcopysize = 0;
*patch = NULL;
*patchlen = 0;
while ((len = libpatch_next_line__(&text, &textlen, len))) {
if (can_continue) {
can_continue = 0;
if (len == 1 && text[0] == 'a') {
in_hunk = 1;
} else if (len == 1 && text[0] == 'i') {
goto garbage; /* TODO */
} else if (len >= 5 && !strncmp(text, "s/", 2) && text[len - 1] == '/') {
if (*patchlen < 2 || !IS_LINE((*patch)[*patchlen - 2].type))
goto garbage;
/* TODO add support for more weird alternatives */
if (!(len == 5 && !strncmp(text, "s/.//", len)) &&
!(len == 6 && !strncmp(text, "s/^.//", len)) &&
!(len == 6 && !strncmp(text, "s/\\.//", len)) &&
!(len == 7 && !strncmp(text, "s/^\\.//", len)))
goto garbage;
(*patch)[*patchlen - 2].text_offset += 1;
(*patch)[*patchlen - 2].text_length -= 1;
APPEND_STRING(len, LIBPATCH_PATCH_SYNTACTICAL);
} else {
goto else_if;
}
APPEND_STRING(len, LIBPATCH_PATCH_SYNTACTICAL);
} else else_if: if (in_hunk && len == 1 && text[0] == '.') {
APPEND_STRING(len, LIBPATCH_PATCH_SYNTACTICAL);
in_hunk = 0;
can_continue = 1;
} else if (in_hunk) {
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;
if (libpatch_reverse_hunks__(*patch, *patchlen, hunks, nhunks, &patchcopy, &patchcopysize))
goto fail;
nhunks = 0;
APPEND_STRING(5, LIBPATCH_PATCH_DIFF_LINE);
} else if (len >= 2 && isdigit(text[0])) {
off = hunk_head(text, len, &line, &last);
if (len - off != 1)
goto garbage;
if (!line && last)
goto garbage;
else if (!line)
count = 0, line = 1;
else if (last < line)
goto garbage;
else
count = last - line + 1;
if (text[off] == 'd') {
APPEND_NO_TEXT(LIBPATCH_PATCH_HUNK_WITH_DELETION);
(*patch)[*patchlen - 1].first_line = line;
(*patch)[*patchlen - 1].line_count = count;
} else if (text[off] == 'a') {
APPEND_NO_TEXT(LIBPATCH_PATCH_HUNK);
in_hunk = 1;
} else if (text[off] == 'c') {
APPEND_NO_TEXT(LIBPATCH_PATCH_HUNK_WITH_DELETION);
(*patch)[*patchlen - 1].first_line = line;
(*patch)[*patchlen - 1].line_count = count;
in_hunk = 1;
} else if (text[off] == 'i') {
goto garbage; /* TODO */
} else {
goto garbage;
}
if (nhunks == hunks_size) {
if (hunks_size > SIZE_MAX / sizeof(*hunks) - 16)
goto enomem;
new = realloc(hunks, (hunks_size += 16) * sizeof(*hunks));
if (!new)
goto fail;
hunks = new;
}
hunks[nhunks++] = *patchlen - 1;
has_patch = 1;
} else {
garbage:
APPEND_STRING(0, LIBPATCH_PATCH_GARBAGE);
if (len == textlen)
(*patch)[*patchlen - 1].lf_terminated = 0;
}
}
if (libpatch_reverse_hunks__(*patch, *patchlen, hunks, nhunks, &patchcopy, &patchcopysize))
goto fail;
if (textend)
*textend = (size_t)(text - patchtext);
free(patchcopy);
free(hunks);
return 0;
enomem:
errno = ENOMEM;
fail:
free(patchcopy);
free(hunks);
free(*patch);
*patch = NULL;
*patchlen = 0;
return -1;
}
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