First commitHEADmaster

Signed-off-by: Mattias Andrée <maandree@kth.se>

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;
+}