First commit

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

1 files changed, 153 insertions, 0 deletions

diff --git a/libpatch_parse_copied_patch.c b/libpatch_parse_copied_patch.c
new file mode 100644
index 0000000..b6849b8
--- /dev/null
+++ b/libpatch_parse_copied_patch.c
@@ -0,0 +1,153 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+static size_t
+hunk_head(const char *text, size_t len, const char *suffix, size_t *first, size_t *last)
+{
+	size_t off = 4, 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;
+	}
+	if (5 < len - off && strncmp(&text[off], suffix, 5))
+		return 0;
+	off += 5;
+	return off;
+}
+
+
+int
+libpatch_parse_copied_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, lineno, last, count;
+	int need_hunk = 0, in_hunk = 0, type, 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);
+			need_hunk = 0;
+			in_hunk = 0;
+
+		} else if (len >= 15 && !strncmp(text, "***************", 15)) {
+			APPEND_OPTSTRING(15, LIBPATCH_PATCH_HUNK);
+			need_hunk = 1;
+			in_hunk = 0;
+			has_patch = 1;
+
+		} else if (len >= 3 && !strncmp(text, "***", 3)) {
+			if (!need_hunk) {
+				APPEND_OPTSTRING(3, LIBPATCH_PATCH_FILE1_LABEL);
+				(*patch)[*patchlen - 1].lf_terminated = 0;
+			} else if (need_hunk == 1 && len > 9 && text[3] == ' ') {
+				off = hunk_head(text, len, " ****", &lineno, &last);
+				if (!off)
+					goto garbage;
+				APPEND_OPTSTRING(off, LIBPATCH_PATCH_HUNK_FILE1);
+				if (!lineno && last)
+					goto garbage;
+				else if (!lineno)
+					count = 0;
+				else if (last < lineno)
+					goto garbage;
+				else
+					count = last - lineno + 1;
+				need_hunk = 2;
+				in_hunk = lineno > 0 ? 1 : 0;
+			} else {
+				goto garbage;
+			}
+
+		} else if (len >= 3 && !strncmp(text, "---", 3)) {
+			if (!need_hunk) {
+				APPEND_OPTSTRING(3, LIBPATCH_PATCH_FILE2_LABEL);
+				(*patch)[*patchlen - 1].lf_terminated = 0;
+				has_patch = 1;
+			} else if (need_hunk == 2 && len > 9 && text[3] == ' ') {
+				off = hunk_head(text, len, " ----", &lineno, &last);
+				if (!off)
+					goto garbage;
+				APPEND_OPTSTRING(off, LIBPATCH_PATCH_HUNK_FILE2);
+				count = 0;
+				if (!lineno && last)
+					goto garbage;
+				else if (!lineno)
+					count = 0;
+				else if (last < lineno)
+					goto garbage;
+				else
+					count = last - lineno + 1;
+				need_hunk = 0;
+				in_hunk = lineno > 0 ? 2 : 0;
+			} else {
+				goto garbage;
+			}
+
+		} else if (len >= 2 && in_hunk == 1 && !strncmp(text, "- ", 2)) {
+			type = LIBPATCH_PATCH_FILE1_ONLY;
+			goto file1_line;
+		} else if (len >= 2 && in_hunk == 1 && !strncmp(text, "! ", 2)) {
+			type = LIBPATCH_PATCH_PRECHANGE;
+			goto file1_line;
+		} else if (len >= 2 && in_hunk == 1 && !strncmp(text, "  ", 2)) {
+			type = LIBPATCH_PATCH_FILE1_CONTEXT;
+		file1_line:
+			APPEND_OPTSTRING(2, type);
+			if (!--count)
+				in_hunk = 0;
+			(*patch)[*patchlen - 1].file1_lineno = lineno++;
+
+		} else if (len >= 2 && in_hunk == 2 && !strncmp(text, "+ ", 2)) {
+			type = LIBPATCH_PATCH_FILE2_ONLY;
+			goto file2_line;
+		} else if (len >= 2 && in_hunk == 2 && !strncmp(text, "! ", 2)) {
+			type = LIBPATCH_PATCH_POSTCHANGE;
+			goto file2_line;
+		} else if (len >= 2 && in_hunk == 2 && !strncmp(text, "  ", 2)) {
+			type = LIBPATCH_PATCH_FILE2_CONTEXT;
+		file2_line:
+			APPEND_OPTSTRING(2, type);
+			if (!--count)
+				in_hunk = 0;
+			(*patch)[*patchlen - 1].file2_lineno = lineno++;
+
+		} 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;
+}