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