1 files changed, 109 insertions, 0 deletions
diff --git a/libpatch_format_copied_patch.c b/libpatch_format_copied_patch.c
new file mode 100644
index 0000000..9f0378d
--- /dev/null
+++ b/libpatch_format_copied_patch.c
@@ -0,0 +1,109 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+static void
+print_line(struct libpatch_diff2_printer *printer, const struct libpatch_file *file, size_t lineno)
+{
+	printer->put_line(printer, file->lines[lineno]);
+	printer->put_newline(printer);
+	if (lineno + 1 == file->nlines && !file->lf_terminated) {
+		printer->put_no_newline(printer, "\\ No newline at end of file");
+		printer->put_newline(printer);
+	}
+}
+
+
+static void
+print_change(struct libpatch_diff2_printer *printer, int fileno, int both, const struct libpatch_file *file, size_t lineno)
+{
+	printer->put_change_prefix(printer, both ? "! " : fileno == 1 ? "- " : "+ ", fileno, 0, lineno);
+	print_line(printer, file, lineno);
+}
+
+
+static void
+print_context(struct libpatch_diff2_printer *printer, int fileno, const struct libpatch_file *file, size_t lineno)
+{
+	printer->put_context_prefix(printer, "  ", fileno == 1, fileno == 2, lineno);
+	print_line(printer, file, lineno);
+}
+
+
+static void
+print_hunk_head(struct libpatch_diff2_printer *printer, const char *prefix, const char *suffix,
+                size_t lineno, size_t len, int file)
+{
+	printer->put_hunk_head_prefix(printer, prefix, file);
+	printer->put_whitespace(printer, " ");
+	printer->put_hunk_start(printer, "", lineno + (size_t)(len > 0), file);
+	if (len > 1)
+		printer->put_hunk_end(printer, ",", lineno + len, file);
+	printer->put_whitespace(printer, " ");
+	printer->put_hunk_head_suffix(printer, suffix, file);
+	printer->put_newline(printer);
+}
+
+
+int
+libpatch_format_copied_patch(struct libpatch_diff2_printer *printer, struct libpatch_diff2 *diff, size_t difflen,
+                             const struct libpatch_file *file1, const struct libpatch_file *file2)
+{
+#define HUNK(FNO, FI, FN)\
+	do {\
+		for (; i < n; i++) {\
+			if (changed_saved) {\
+				changed_saved -= 1;\
+			} else if (diff[i].repetition & 0x03) {\
+				for (changed_saved = 0; changed_saved < n - i;)\
+					changed |= diff[i + changed_saved++].repetition;\
+				changed_saved -= 1;\
+			} else {\
+				changed = 0;\
+			}\
+			for (j = 0; j < diff[i].repetition; j++) {\
+				if (diff[i].change == LIBPATCH_DIFF2_FILE##FNO##_ONLY ||\
+				    diff[i].change == LIBPATCH_DIFF2_TWO_FILE_CHANGE)\
+					print_change(printer, FNO, changed == 0x03, file##FNO, FI++);\
+				else if (diff[i].change == LIBPATCH_DIFF2_CONTEXT)\
+					print_context(printer, FNO, file##FNO, FI++);\
+			}\
+		}\
+	} while (0)
+
+	size_t i, i0, j, n, ai, bi, an, bn, changed_saved = 0;
+	int changed = 0, have;
+
+	printer->put_label_prefix(printer, "***", 1);
+	printer->put_whitespace(printer, " ");
+	if (file1->label)
+		printer->put_label(printer, file1->label, 1);
+	printer->put_newline(printer);
+
+	printer->put_label_prefix(printer, "---", 2);
+	printer->put_whitespace(printer, " ");
+	if (file2->label)
+		printer->put_label(printer, file2->label, 2);
+	printer->put_newline(printer);
+
+	ai = 0;
+	bi = 0;
+	for (i = 0; (n = libpatch_next_hunk(diff, difflen, &i, &ai, &bi, &an, &bn, 0));) {
+		have = 0;
+		for (n += j = i; j < n; j++)
+			have |= diff[j].change;
+
+		printer->put_syntactical_garbage(printer, "***************");
+		printer->put_newline(printer);
+		if (have & 1) {
+			i0 = i;
+			print_hunk_head(printer, "***", "****", ai, an, 1);
+			HUNK(1, ai, an);
+			i = i0;
+		}
+		print_hunk_head(printer, "---", "----", bi, bn, 2);
+		HUNK(2, bi, bn);
+	}
+
+	return 0;
+}