#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

int main(int argc, char **argv) {
  int ret;
  char **f;
  mode_t mode;

  if(argc < 2) {
    printf("Usage: %s <mode> <files>\n", argv[0]);
    return EXIT_FAILURE;
  }

  ret = sscanf(argv[1], "%o", &mode);
  if(ret < 1) {
    fprintf(stderr, "Invalid mode: %s\n", argv[1]);
    return EXIT_FAILURE;
  }

  f = &argv[2];
  argc -= 2;

  while(argc--) {
    ret = chmod(*f, mode);
    if(ret < 0)
      fprintf(stderr, "Error changing mode on file %s: %s\n", *f, strerror(errno));
    f++;
  }
}