From ae850b1ac755f471beac4dbfef4654fe3fbaaae9 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 9 Jan 2024 22:04:24 +0100 Subject: First commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libpatch_reverse_hunks__.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 libpatch_reverse_hunks__.c (limited to 'libpatch_reverse_hunks__.c') 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; +} -- cgit v1.2.3-70-g09d2