74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
/* This file is part of the sample code and exercises
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* used by the class "Advanced Programming in the UNIX
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* Environment" taught by Jan Schaumann
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* <jschauma@netmeister.org> at Stevens Institute of
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* Technology.
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*
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* This file is in the public domain.
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*
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* You don't have to, but if you feel like
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* acknowledging where you got this code, you may
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* reference me by name, email address, or point
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* people to the course website:
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* https://stevens.netmeister.org/631/
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*/
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/*
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* simple-ls.c
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* Extremely low-power ls clone.
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* ./simple-ls .
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <errno.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void
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printOwner(char *name, struct stat sb) {
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struct passwd *pwd;
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pwd = getpwuid(sb.st_uid);
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printf("%s (%s)\n", name, pwd->pw_name);
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}
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int
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main(int argc, char **argv) {
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DIR *dp;
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struct dirent *dirp;
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if (argc != 2) {
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fprintf(stderr, "usage: %s dir_name\n", argv[0]);
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exit(1);
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}
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if ((dp = opendir(argv[1])) == NULL) {
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fprintf(stderr, "can't open '%s'\n", argv[1]);
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exit(1);
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}
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if (chdir(argv[1]) == -1) {
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fprintf(stderr, "can't chdir to '%s': %s\n", argv[1], strerror(errno));
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exit(EXIT_FAILURE);
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}
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while ((dirp = readdir(dp)) != NULL) {
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struct stat sb;
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if (stat(dirp->d_name, &sb) == -1) {
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fprintf(stderr, "Can't stat %s: %s\n", dirp->d_name,
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strerror(errno));
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continue;
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}
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printOwner(dirp->d_name, sb);
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}
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closedir(dp);
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return(0);
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}
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