1  /*
       2   * SPDX-License-Identifier: GPL-2.0-or-later
       3   *
       4   * This test program prints errno messages to allow for portable
       5   * verification of error messages.
       6   *
       7   * Copyright (C) 2019 Patrick Steinhardt <ps@pks.im
       8   */
       9  
      10  #include <errno.h>
      11  #include <stdio.h>
      12  #include <stdlib.h>
      13  #include <string.h>
      14  
      15  #define E(x) { #x, x }
      16  static struct {
      17  	const char *str;
      18  	int error;
      19  } errors[] = {
      20  	E(ENOENT),
      21  	E(ENOTTY),
      22  	E(EILSEQ),
      23  	E(EINVAL),
      24  };
      25  
      26  int main(int argc, const char *argv[])
      27  {
      28  	size_t i;
      29  
      30  	if (argc != 2) {
      31  		fprintf(stderr, "USAGE: %s <errno>\n", argv[0]);
      32  		return -1;
      33  	}
      34  
      35  	for (i = 0; i < sizeof(errors)/sizeof(*errors); i++) {
      36  		if (strcmp(errors[i].str, argv[1]) != 0)
      37  			continue;
      38  		puts(strerror(errors[i].error));
      39  		return 0;
      40  	}
      41  
      42  	fprintf(stderr, "Invalid errno: %s\n", argv[1]);
      43  	return -1;
      44  }