101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <sys/limits.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <time.h>
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void recurse_chmod(char* path, int mode)
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{
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struct dirent *dp;
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DIR *dir = opendir(path);
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if (dir == NULL) {
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// not a directory, carry on
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return;
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}
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char *subpath = malloc(sizeof(char)*PATH_MAX);
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int pathlen = strlen(path);
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while ((dp = readdir(dir)) != NULL) {
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if (strcmp(dp->d_name, ".") == 0 ||
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strcmp(dp->d_name, "..") == 0) continue;
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if (strlen(dp->d_name) + pathlen + 2/*NUL and slash*/ > PATH_MAX) {
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fprintf(stderr, "Invalid path specified: too long\n");
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exit(1);
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}
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strcpy(subpath, path);
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strcat(subpath, "/");
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strcat(subpath, dp->d_name);
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if (chmod(subpath, mode) < 0) {
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fprintf(stderr, "Unable to chmod %s: %s\n", subpath, strerror(errno));
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exit(1);
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}
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recurse_chmod(subpath, mode);
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}
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free(subpath);
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closedir(dir);
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}
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static int usage()
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{
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fprintf(stderr, "Usage: chmod [OPTION] <MODE> <FILE>\n");
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fprintf(stderr, " -R, --recursive change files and directories recursively\n");
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fprintf(stderr, " --help display this help and exit\n");
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return 10;
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}
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int chmod_main(int argc, char **argv)
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{
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int i;
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if (argc < 3 || strcmp(argv[1], "--help") == 0) {
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return usage();
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}
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int recursive = (strcmp(argv[1], "-R") == 0 ||
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strcmp(argv[1], "--recursive") == 0) ? 1 : 0;
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if (recursive && argc < 4) {
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return usage();
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}
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if (recursive) {
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argc--;
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argv++;
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}
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int mode = 0;
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const char* s = argv[1];
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while (*s) {
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if (*s >= '0' && *s <= '7') {
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mode = (mode<<3) | (*s-'0');
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}
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else {
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fprintf(stderr, "Bad mode\n");
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return 10;
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}
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s++;
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}
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for (i = 2; i < argc; i++) {
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if (chmod(argv[i], mode) < 0) {
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fprintf(stderr, "Unable to chmod %s: %s\n", argv[i], strerror(errno));
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return 10;
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}
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if (recursive) {
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recurse_chmod(argv[i], mode);
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}
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}
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return 0;
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}
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