diff options
Diffstat (limited to 'compat')
-rw-r--r-- | compat/fopen.c | 26 | ||||
-rw-r--r-- | compat/qsort.c | 62 | ||||
-rw-r--r-- | compat/snprintf.c | 40 |
3 files changed, 128 insertions, 0 deletions
diff --git a/compat/fopen.c b/compat/fopen.c new file mode 100644 index 0000000000..ccb9e89fa4 --- /dev/null +++ b/compat/fopen.c @@ -0,0 +1,26 @@ +#include "../git-compat-util.h" +#undef fopen +FILE *git_fopen(const char *path, const char *mode) +{ + FILE *fp; + struct stat st; + + if (mode[0] == 'w' || mode[0] == 'a') + return fopen(path, mode); + + if (!(fp = fopen(path, mode))) + return NULL; + + if (fstat(fileno(fp), &st)) { + fclose(fp); + return NULL; + } + + if (S_ISDIR(st.st_mode)) { + fclose(fp); + errno = EISDIR; + return NULL; + } + + return fp; +} diff --git a/compat/qsort.c b/compat/qsort.c new file mode 100644 index 0000000000..d93dce2cf8 --- /dev/null +++ b/compat/qsort.c @@ -0,0 +1,62 @@ +#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. + */ + +static void msort_with_tmp(void *b, size_t n, size_t s, + int (*cmp)(const void *, const void *), + char *t) +{ + 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); + msort_with_tmp(b2, n2, s, cmp, t); + + tmp = t; + + while (n1 > 0 && n2 > 0) { + if (cmp(b1, b2) <= 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); +} + +void git_qsort(void *b, size_t n, size_t s, + int (*cmp)(const void *, const void *)) +{ + const size_t size = n * s; + char buf[1024]; + + if (size < sizeof(buf)) { + /* The temporary array fits on the small on-stack buffer. */ + msort_with_tmp(b, n, s, cmp, buf); + } else { + /* It's somewhat large, so malloc it. */ + char *tmp = malloc(size); + msort_with_tmp(b, n, s, cmp, tmp); + free(tmp); + } +} diff --git a/compat/snprintf.c b/compat/snprintf.c new file mode 100644 index 0000000000..dbfc2d6b6e --- /dev/null +++ b/compat/snprintf.c @@ -0,0 +1,40 @@ +#include "../git-compat-util.h" + +#undef vsnprintf +int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap) +{ + char *s; + int ret; + + ret = vsnprintf(str, maxsize, format, ap); + if (ret != -1) + return ret; + + s = NULL; + if (maxsize < 128) + maxsize = 128; + + while (ret == -1) { + maxsize *= 4; + str = realloc(s, maxsize); + if (! str) + break; + s = str; + ret = vsnprintf(str, maxsize, format, ap); + } + free(s); + return ret; +} + +int git_snprintf(char *str, size_t maxsize, const char *format, ...) +{ + va_list ap; + int ret; + + va_start(ap, format); + ret = git_vsnprintf(str, maxsize, format, ap); + va_end(ap); + + return ret; +} + |