nop.c

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/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#include "config.h"
 
#include <cgraph/cgraph.h>
#include <cgraph/ingraphs.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <util/exit.h>
 
#include <getopt.h>
 
static char **Files;
static bool chkOnly;
 
static const char useString[] = "Usage: nop [-p?] <files>\n\
  -p - check for valid DOT\n\
  -? - print usage\n\
If no files are specified, stdin is used";
 
static void usage(int v) {
  puts(useString);
  graphviz_exit(v);
}
 
static void init(int argc, char *argv[]) {
  int c;
 
  opterr = 0;
  while ((c = getopt(argc, argv, "p?")) != -1) {
    switch (c) {
    case 'p':
      chkOnly = true;
      break;
    case '?':
      if (optopt == '\0' || optopt == '?')
        usage(EXIT_SUCCESS);
      else {
        fprintf(stderr, "nop: option -%c unrecognized\n", optopt);
        usage(EXIT_FAILURE);
      }
      break;
    default:
      fprintf(stderr, "nop: unexpected error\n");
      graphviz_exit(EXIT_FAILURE);
    }
  }
  argv += optind;
  argc -= optind;
 
  if (argc)
    Files = argv;
}
 
int main(int argc, char **argv) {
  Agraph_t *g;
  ingraph_state ig;
 
  init(argc, argv);
  newIngraph(&ig, Files);
 
  while ((g = nextGraph(&ig)) != 0) {
    if (!chkOnly)
      agwrite(g, stdout);
    agclose(g);
  }
 
  graphviz_exit(ig.errors != 0 || agerrors() != 0 ? EXIT_FAILURE
                                                  : EXIT_SUCCESS);
}