copy ACL from source to target

cpacl.c

/*
    cpacl.c: copy solaris ACLs from one file to another
    author: Chris Lee <clee@mg8.org>
    license: WTFPL <http://sam.zoy.org/wtfpl/COPYING>

    make: cc -o cpacl cpacl.c -lsec -lc
 */
#include <sys/acl.h>
#include <stdio.h>

int main(int argc, char **argv) {
  acl_t *aclp;
  int i = 0, r = 0;
  if (argc < 3) {
    fprintf(stderr, "%s: error: invalid arguments\n\tusage: %s <source> <target> [target2, target3, ...]\n", argv[0], argv[0]);
    return 2;
  }

  if (0 != acl_get(argv[1], 0, &aclp)) {
    perror("Couldn't read ACL from source file");
    return 3;
  }
  for (i = 2; i < argc; i++) {
    if (0 == acl_set(argv[i], aclp)) {
      continue;
    }
    char *message = malloc(32 + strlen(argv[i]) * sizeof(char));
    snprintf(message, 32 + strlen(argv[i]), "Couldn't write ACL to target (%s)", argv[i]);
    perror(message);
    return 4;
  }
  return 0;
}