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/* 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;
}
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