1 files changed, 76 insertions, 0 deletions
diff --git a/libpatch_parse_rcs_patch.c b/libpatch_parse_rcs_patch.c
new file mode 100644
index 0000000..04dc671
--- /dev/null
+++ b/libpatch_parse_rcs_patch.c
@@ -0,0 +1,76 @@
+/* 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;
+}