acyclic.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
 *************************************************************************/
 
 
/*
 * Written by Stephen North
 * Updated by Emden Gansner
 */
 
#include <stdbool.h>
#include <stdio.h>
 
#include <stdlib.h>
#include <cgraph/cgraph.h>
#include <cgraph/exit.h>
#include <cgraph/prisize_t.h>
#include <cgraph/unreachable.h>
#include "openFile.h"
 
#define graphName(g) (agnameof(g))
 
#include <getopt.h>
 
static FILE *inFile;
 
typedef graphviz_acyclic_options_t opts_t;
 
static char *cmd;
 
static char *useString = "Usage: %s [-nv?] [-o outfile] <file>\n\
  -o <file> - put output in <file>\n\
  -n        - do not output graph\n\
  -v        - verbose\n\
  -?        - print usage\n";
 
static void usage(int v)
{
    fprintf(stderr, useString, cmd);
    graphviz_exit(v);
}
 
static void init(opts_t *opts, int argc, char *argv[]) {
    int c;
 
    cmd = argv[0];
    opterr = 0;
    while ((c = getopt(argc, argv, ":vno:")) != -1)
        switch (c) {
        case 'o':
            if (opts->outFile != NULL)
                fclose(opts->outFile);
            opts->outFile = openFile(argv[0], optarg, "w");
            break;
        case 'n':
            opts->doWrite = false;
            break;
        case 'v':
            opts->Verbose = true;
            break;
        case '?':
            if (optopt == '?')
                usage(0);
            else {
                fprintf(stderr, "%s: option -%c unrecognized\n", cmd,
                        optopt);
                usage(-1);
            }
            break;
        case ':':
            fprintf(stderr, "%s: missing argument for option -%c\n",
                    cmd, optopt);
            usage(-1);
            break;
        default:
            UNREACHABLE();
        }
    if (optind < argc) {
        inFile = openFile(argv[0], argv[optind], "r");
    } else
        inFile = stdin;
    if (!opts->outFile)
        opts->outFile = stdout;
}
 
int main(int argc, char *argv[])
{
    Agraph_t *g;
    int rv = 0;
    opts_t opts = {0};
    size_t num_rev = 0;
 
    init(&opts, argc, argv);
 
    if ((g = agread(inFile, NULL)) != NULL) {
        if (agisdirected (g)) {
            rv |= graphviz_acyclic(g, &opts, &num_rev);
            if (opts.Verbose) {
                if (rv)
                    fprintf(stderr, "Graph \"%s\" has cycles; %" PRISIZE_T " reversed edges\n",
                            graphName(g), num_rev);
                else
                    fprintf(stderr, "Graph \"%s\" is acyclic\n", graphName(g));
            }
        } else {
            rv = -1;
            if (opts.Verbose)
                fprintf(stderr, "Graph \"%s\" is undirected\n", graphName(g));
        }
        graphviz_exit(rv);
    } else
        graphviz_exit(-1);
}