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 <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\n";
 
static void usage(int v)
{
    printf("%s",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);
}