115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <sys/stat.h>
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char filetype(mode_t mode);
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char *getpermissions(mode_t mode);
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int main(int argc, char *argv[])
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{
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char *dirname = ".";
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if (argc > 1)
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dirname = argv[1];
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DIR *dir = opendir(dirname);
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if (dir == NULL) {
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int errsv = errno;
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fprintf(stderr, "%s: cannot access %s: %s\n", argv[0], dirname, strerror(errsv));
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return EXIT_FAILURE;
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}
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struct stat statbuf;
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struct dirent *dirp;
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while ((dirp = readdir(dir)) != NULL) {
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// Skip current and previous directory symbols
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if (strcmp(dirp->d_name, ".") == 0 ||
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strcmp(dirp->d_name, "..") == 0)
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continue;
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "%s/%s", dirname, dirp->d_name);
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if (stat(path, &statbuf) < 0) {
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int errsv = errno;
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fprintf(stderr, "%s: cannot stat %s: %s\n", argv[0], path, strerror(errsv));
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continue;
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}
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char type = filetype(statbuf.st_mode);
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char *permissions = getpermissions(statbuf.st_mode);
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/*
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* Format output:
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* TYPE: d (directory) | f (regular file) | l (symbolic link) | o (others)
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* PERMISSIONS (ex. rwxrwxrwx)
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* NR HARD LINKS
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* USER
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* GROUP
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* SIZE
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* NAME
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*/
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printf("%c%s %lu %u %u %6lu %s\n",
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type, permissions, statbuf.st_nlink,
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statbuf.st_uid, statbuf.st_gid, statbuf.st_size,
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dirp->d_name);
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if (permissions != NULL) {
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free(permissions);
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permissions = NULL;
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}
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}
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if (closedir(dir) == -1) {
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int errsv = errno;
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fprintf(stderr, "%s: cannot close %s: %s\n", argv[0], dirname, strerror(errsv));
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return EXIT_FAILURE;
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}
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}
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char filetype(mode_t mode)
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{
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if (S_ISREG(mode)) return '-';
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if (S_ISDIR(mode)) return 'd';
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if (S_ISLNK(mode)) return 'l';
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if (S_ISCHR(mode)) return 'c';
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if (S_ISBLK(mode)) return 'b';
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if (S_ISFIFO(mode)) return 'p';
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#ifdef S_ISSOCK
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if (S_ISSOCK(mode)) return 's';
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#endif
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return '?';
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}
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char checkpermission(mode_t mode, int perm, char c)
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{
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return (mode & perm) ? c : '-';
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}
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char *getpermissions(mode_t mode)
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{
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char *permissions = malloc(9 + 1);
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/* User */
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permissions[0] = checkpermission(mode, S_IRUSR, 'r');
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permissions[1] = checkpermission(mode, S_IWUSR, 'w');
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permissions[2] = checkpermission(mode, S_IXUSR, 'x');
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/* Group */
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permissions[3] = checkpermission(mode, S_IRGRP, 'r');
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permissions[4] = checkpermission(mode, S_IWGRP, 'w');
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permissions[5] = checkpermission(mode, S_IXGRP, 'x');
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/* Other */
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permissions[6] = checkpermission(mode, S_IROTH, 'r');
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permissions[7] = checkpermission(mode, S_IWOTH, 'w');
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permissions[8] = checkpermission(mode, S_IXOTH, 'x');
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permissions[9] = '\0';
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return permissions;
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}
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