mirror of
https://github.com/encounter/newlib.git
synced 2026-03-30 11:31:09 -07:00
Dave Murphy
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
#include <sys/types.h>
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#include <sys/stat.h>
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#include <stddef.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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/*
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* The DIRSIZ macro gives the minimum record length which will hold
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* the directory entry. This requires the amount of space in struct dirent
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* without the d_name field, plus enough space for the name with a terminating
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* null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
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*/
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#undef DIRSIZ
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#ifdef _DIRENT_HAVE_D_NAMLEN
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#define DIRSIZ(dp) \
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(offsetof (struct dirent, d_name) + (((dp)->d_namlen+1 + 3) &~ 3))
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#else
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#define DIRSIZ(dp) \
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(offsetof (struct dirent, d_name) + ((strlen((dp)->d_name)+1 + 3) &~ 3))
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#endif
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int
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scandir (const char *dirname,
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struct dirent ***namelist,
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int (*filter) __P((const struct dirent *)),
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int (*compar) __P((const struct dirent **, const struct dirent **)))
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{
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DIR *d = opendir(dirname);
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if (!d) return -1;
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struct dirent *de, **names = NULL, **tmp;
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size_t cnt = 0, len = 0;
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while (de = readdir(d)) {
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if (filter && ! filter(de)) continue;
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if (cnt >= len) {
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len = 2*len+1;
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if (len > SIZE_MAX/sizeof(*names)) break;
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tmp = realloc(names, len * sizeof(*names));
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if (!tmp) break;
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names = tmp;
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}
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names[cnt] = malloc(DIRSIZ(de));
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if (!names[cnt]) break;
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memcpy(names[cnt++], de, DIRSIZ(de));
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}
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closedir(d);
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if(errno) {
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if (names) while(cnt-- > 0) free(names[cnt]);
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free(names);
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return -1;
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}
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if (compar) qsort(names, cnt, sizeof(*names), (int (*)(const void *, const void *))compar);
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*namelist = names;
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return cnt;
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}
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/*
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* Alphabetic order comparison routine for those who want it.
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*/
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int
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alphasort (const struct dirent **d1,
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const struct dirent **d2)
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{
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return(strcmp((*d1)->d_name, (*d2)->d_name));
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}
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