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Add -R to chmod

Change-Id: I30f976598bd937f656a3ad3395349f09e695cfce
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1 parent 230cb33 commit 365a09e817e919c491a1e8abce0b734af14d3e5f Anthony Newnam committed Jul 6, 2010
Showing with 64 additions and 3 deletions.
  1. +64 −3 toolbox/chmod.c
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67 toolbox/chmod.c
@@ -4,17 +4,74 @@
#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) {
- fprintf(stderr, "Usage: chmod <MODE> <FILE>\n");
- return 10;
+ 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;
@@ -29,11 +86,15 @@ int chmod_main(int argc, char **argv)
}
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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