mirror of https://github.com/mpv-player/mpv
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* scandir, alphasort - scan a directory
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*
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* implementation for systems that do not have it in libc
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*/
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#include "../config.h"
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#ifndef HAVE_SCANDIR
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#include <sys/types.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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/*
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* convenience helper function for scandir's |compar()| function:
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* sort directory entries using strcoll(3)
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*/
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int
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alphasort(const void *_a, const void *_b)
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{
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struct dirent **a = (struct dirent **)_a;
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struct dirent **b = (struct dirent **)_b;
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return strcoll((*a)->d_name, (*b)->d_name);
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}
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#define strverscmp(a,b) strcoll(a,b) /* for now */
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/*
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* convenience helper function for scandir's |compar()| function:
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* sort directory entries using GNU |strverscmp()|
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*/
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int
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versionsort(const void *_a, const void *_b)
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{
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struct dirent **a = (struct dirent **)_a;
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struct dirent **b = (struct dirent **)_b;
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return strverscmp((*a)->d_name, (*b)->d_name);
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}
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/*
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* The scandir() function reads the directory dirname and builds an
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* array of pointers to directory entries using malloc(3). It returns
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* the number of entries in the array. A pointer to the array of
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* directory entries is stored in the location referenced by namelist.
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*
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* The select parameter is a pointer to a user supplied subroutine
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* which is called by scandir() to select which entries are to be
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* included in the array. The select routine is passed a pointer to
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* a directory entry and should return a non-zero value if the
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* directory entry is to be included in the array. If select is null,
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* then all the directory entries will be included.
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*
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* The compar parameter is a pointer to a user supplied subroutine
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* which is passed to qsort(3) to sort the completed array. If this
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* pointer is null, the array is not sorted.
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*/
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int
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scandir(const char *dirname,
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struct dirent ***ret_namelist,
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int (*select)(const struct dirent *),
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int (*compar)(const struct dirent **, const struct dirent **))
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{
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int i, len;
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int used, allocated;
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DIR *dir;
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struct dirent *ent, *ent2;
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struct dirent **namelist = NULL;
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if ((dir = opendir(dirname)) == NULL)
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return -1;
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used = 0;
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allocated = 2;
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namelist = malloc(allocated * sizeof(struct dirent *));
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if (!namelist)
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goto error;
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while ((ent = readdir(dir)) != NULL) {
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if (select != NULL && !select(ent))
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continue;
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/* duplicate struct direct for this entry */
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len = offsetof(struct dirent, d_name) + strlen(ent->d_name) + 1;
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if ((ent2 = malloc(len)) == NULL)
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goto error;
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if (used >= allocated) {
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allocated *= 2;
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namelist = realloc(namelist, allocated * sizeof(struct dirent *));
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if (!namelist)
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goto error;
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}
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memcpy(ent2, ent, len);
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namelist[used++] = ent2;
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}
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closedir(dir);
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if (compar)
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qsort(namelist, used, sizeof(struct dirent *),
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(int (*)(const void *, const void *)) compar);
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*ret_namelist = namelist;
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return used;
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error:
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closedir(dir);
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if (namelist) {
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for (i = 0; i < used; i++)
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free(namelist[i]);
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free(namelist);
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}
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return -1;
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}
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#endif
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#if STANDALONE_MAIN
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int
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main(int argc, char **argv)
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{
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struct dirent **namelist;
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int i, n;
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n = scandir("/etc", &namelist, NULL, alphasort);
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for (i = 0; i < n; i++)
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printf("%s\n", namelist[i]->d_name);
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}
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#endif
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