src/chown.c


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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main(int argc, char **argv) {
  int ret;
  char **f;
  uid_t uid;
  gid_t gid;

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

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

  if(ret < 2)
    gid = -1;

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

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