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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:47:53 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:47:53 +0000 |
commit | c8bae7493d2f2910b57f13ded012e86bdcfb0532 (patch) | |
tree | 24e09d9f84dec336720cf393e156089ca2835791 /compat/qsort_s.c | |
parent | Initial commit. (diff) | |
download | git-c8bae7493d2f2910b57f13ded012e86bdcfb0532.tar.xz git-c8bae7493d2f2910b57f13ded012e86bdcfb0532.zip |
Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | compat/qsort_s.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/compat/qsort_s.c b/compat/qsort_s.c new file mode 100644 index 0000000..0f7ff30 --- /dev/null +++ b/compat/qsort_s.c @@ -0,0 +1,63 @@ +#include "../git-compat-util.h" + +/* + * A merge sort implementation, simplified from the qsort implementation + * by Mike Haertel, which is a part of the GNU C Library. + * Added context pointer, safety checks and return value. + */ + +static void msort_with_tmp(void *b, size_t n, size_t s, + int (*cmp)(const void *, const void *, void *), + char *t, void *ctx) +{ + char *tmp; + char *b1, *b2; + size_t n1, n2; + + if (n <= 1) + return; + + n1 = n / 2; + n2 = n - n1; + b1 = b; + b2 = (char *)b + (n1 * s); + + msort_with_tmp(b1, n1, s, cmp, t, ctx); + msort_with_tmp(b2, n2, s, cmp, t, ctx); + + tmp = t; + + while (n1 > 0 && n2 > 0) { + if (cmp(b1, b2, ctx) <= 0) { + memcpy(tmp, b1, s); + tmp += s; + b1 += s; + --n1; + } else { + memcpy(tmp, b2, s); + tmp += s; + b2 += s; + --n2; + } + } + if (n1 > 0) + memcpy(tmp, b1, n1 * s); + memcpy(b, t, (n - n2) * s); +} + +int git_qsort_s(void *b, size_t n, size_t s, + int (*cmp)(const void *, const void *, void *), void *ctx) +{ + const size_t size = st_mult(n, s); + char *tmp; + + if (!n) + return 0; + if (!b || !cmp) + return -1; + + tmp = xmalloc(size); + msort_with_tmp(b, n, s, cmp, tmp, ctx); + free(tmp); + return 0; +} |