120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#define OPT_RECURSIVE 1
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#define OPT_FORCE 2
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static int usage()
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{
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fprintf(stderr,"Usage: rm [-rR] [-f] <target>\n");
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return -1;
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}
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/* return -1 on failure, with errno set to the first error */
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static int unlink_recursive(const char* name, int flags)
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{
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struct stat st;
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DIR *dir;
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struct dirent *de;
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int fail = 0;
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/* is it a file or directory? */
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if (lstat(name, &st) < 0)
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return ((flags & OPT_FORCE) && errno == ENOENT) ? 0 : -1;
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/* a file, so unlink it */
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if (!S_ISDIR(st.st_mode))
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return unlink(name);
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/* a directory, so open handle */
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dir = opendir(name);
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if (dir == NULL)
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return -1;
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/* recurse over components */
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errno = 0;
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while ((de = readdir(dir)) != NULL) {
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char dn[PATH_MAX];
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if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, "."))
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continue;
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sprintf(dn, "%s/%s", name, de->d_name);
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if (unlink_recursive(dn, flags) < 0) {
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fail = 1;
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break;
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}
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errno = 0;
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}
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/* in case readdir or unlink_recursive failed */
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if (fail || errno < 0) {
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int save = errno;
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closedir(dir);
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errno = save;
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return -1;
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}
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/* close directory handle */
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if (closedir(dir) < 0)
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return -1;
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/* delete target directory */
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return rmdir(name);
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}
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int rm_main(int argc, char *argv[])
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{
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int ret;
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int i, c;
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int flags = 0;
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if (argc < 2)
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return usage();
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/* check flags */
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do {
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c = getopt(argc, argv, "frR");
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if (c == EOF)
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break;
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switch (c) {
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case 'f':
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flags |= OPT_FORCE;
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break;
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case 'r':
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case 'R':
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flags |= OPT_RECURSIVE;
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break;
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}
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} while (1);
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if (optind < 1 || optind >= argc) {
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usage();
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return -1;
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}
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/* loop over the file/directory args */
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for (i = optind; i < argc; i++) {
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if (flags & OPT_RECURSIVE) {
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ret = unlink_recursive(argv[i], flags);
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} else {
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ret = unlink(argv[i]);
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if (errno == ENOENT && (flags & OPT_FORCE)) {
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return 0;
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}
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}
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if (ret < 0) {
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fprintf(stderr, "rm failed for %s, %s\n", argv[i], strerror(errno));
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return -1;
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}
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}
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return 0;
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}
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