132 lines
2.6 KiB
C
132 lines
2.6 KiB
C
#include <pwd.h>
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#include <grp.h>
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#include <time.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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unsigned int a_flag;
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unsigned int l_flag;
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void PrintPerm(struct stat sb) {
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printf("%c", (S_ISDIR(sb.st_mode)) ? 'd' : '-');
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printf("%c%c%c", (sb.st_mode & S_IRUSR) ? 'r' : '-', (sb.st_mode & S_IWUSR) ? 'w' : '-', (sb.st_mode & S_IXUSR) ? 'x' : '-');
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printf("%c%c%c", (sb.st_mode & S_IRGRP) ? 'r' : '-', (sb.st_mode & S_IWGRP) ? 'w' : '-', (sb.st_mode & S_IXGRP) ? 'x' : '-');
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printf("%c%c%c", (sb.st_mode & S_IROTH) ? 'r' : '-', (sb.st_mode & S_IWOTH) ? 'w' : '-', (sb.st_mode & S_IXOTH) ? 'x' : '-');
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}
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void PrintInfo(struct stat sb, const char *filename) {
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/* Permissions */
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PrintPerm(sb);
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/* Date */
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struct tm *tm = localtime(&sb.st_mtime);
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char date[14];
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if (strftime(date, sizeof(date), "%b %d %H:%M", tm) == 0) {
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fprintf(stderr, "ls: strftime()\n");
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return;
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}
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/* Group and user name */
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struct passwd *pw = getpwuid(sb.st_uid);
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struct group *gr = getgrgid(sb.st_gid);
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printf(" %s %s %jd %s %s\n", (pw != 0) ? pw->pw_name : "nobody", (gr != 0) ? gr->gr_name : "nobody", (uintmax_t)sb.st_size, date, filename);
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}
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int list(const char *path, int label) {
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struct stat sb;
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if (stat(path, &sb)) {
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fprintf(stderr, "ls: unable to stat %s: %s\n", path, strerror(errno));
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return 1;
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}
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/* If its file */
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if (!S_ISDIR(sb.st_mode)) {
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if (l_flag)
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PrintInfo(sb, path);
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else
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puts(path);
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return 0;
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}
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/* Make label */
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if (label)
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printf("\n%s: \n", path);
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if (chdir(path)) {
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fprintf(stderr, "ls: %s: %s\n", path, strerror(errno));
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return 1;
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}
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/* Open and print dir */
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DIR *dp = opendir(".");
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if (dp == NULL)
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return 1;
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struct dirent *ep;
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while ((ep = readdir(dp)) != NULL) {
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if (ep->d_name[0] == '.' && !a_flag)
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continue;
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if (l_flag) {
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if (lstat(ep->d_name, &sb) == -1) {
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fprintf(stderr, "ls: lstat()\n");
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return 1;
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}
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PrintInfo(sb, ep->d_name);
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}
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else
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printf("%s ", ep->d_name);
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}
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closedir(dp);
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printf("\n");
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return 0;
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}
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int main(const int argc, const char **argv) {
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int i;
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for (i = 1; i < argc; i++) {
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if (argv[i][0] != '-')
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break;
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else if (!strcmp(argv[i], "-a"))
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a_flag = 1;
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else if (!strcmp(argv[i], "-l"))
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l_flag = 1;
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else if (!strcmp(argv[i], "--help")) {
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printf("ls [-a (show hidden files)] [-l (use a long listing format)] [Path]\n");
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return 0;
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}
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}
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if (i == argc)
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return list(".", 0);
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if (i == argc - 1)
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return list(argv[i], 0);
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else
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for (int i = 1; i < argc; i++)
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if (list(argv[i], 1))
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return 1;
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return 0;
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}
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