First commit

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

1 files changed, 38 insertions, 0 deletions

diff --git a/libpatch_reverse_hunks__.c b/libpatch_reverse_hunks__.c
new file mode 100644
index 0000000..a22e849
--- /dev/null
+++ b/libpatch_reverse_hunks__.c
@@ -0,0 +1,38 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libpatch_reverse_hunks__(struct libpatch_patch *patch, size_t patchlen,
+                         const size_t *hunks, size_t nhunks,
+                         struct libpatch_patch **patchcopy, size_t *patchcopysize)
+{
+	size_t i, j, first, count, lines;
+	void *new;
+
+	if (nhunks < 2)
+		return 0;
+
+	lines = patchlen - hunks[0];
+	if (lines > *patchcopysize) {
+		new = realloc(*patchcopy, lines * sizeof(**patchcopy));
+		if (!new)
+			return -1;
+		*patchcopy = new;
+		*patchcopysize = lines;
+	}
+
+	j = lines;
+	for (i = 1; i < nhunks; i++) {
+		first = hunks[i - 1];
+		count = hunks[i] - first;
+		memcpy(&patchcopy[j -= count], &patch[first], count * sizeof(*patch));
+	}
+	first = hunks[i - 1];
+	count = patchlen - first;
+	memcpy(&patchcopy[j -= count], &patch[first], count * sizeof(*patch));
+
+	memcpy(&patch[hunks[0]], &patchcopy[0], lines * sizeof(*patch));
+
+	return 0;
+}