cvtgxl.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 Emden R. Gansner and Krishnam Pericherla 
 */
 
#include "config.h"
 
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
 
#include "convert.h"
#include "openFile.h"
#include <cgraph/ingraphs.h>
#include <util/exit.h>
#include <util/gv_ctype.h>
 
typedef enum { Unset, ToGV, ToGXL } mode;
 
static FILE *outFile;
static char *CmdName;
static char **Files;
static mode act = Unset;
 
#ifdef HAVE_EXPAT
static FILE *getFile(void)
{
    FILE *rv = NULL;
    static FILE *savef = NULL;
    static int cnt = 0;
 
    if (Files == NULL) {
        if (cnt++ == 0) {
            rv = stdin;
        }
    } else {
        if (savef)
            fclose(savef);
        while (Files[cnt]) {
            if ((rv = fopen(Files[cnt++], "r")) != 0)
                break;
            else
                fprintf(stderr, "Can't open %s\n", Files[cnt - 1]);
        }
    }
    savef = rv;
    return rv;
}
#endif
 
static const char *use = "Usage: %s [-gd?] [-o<file>] [<graphs>]\n\
 -g        : convert to GXL\n\
 -d        : convert to GV\n\
 -o<file>  : output to <file> (stdout)\n\
 -?        : usage\n";
 
static void usage(int v)
{
    fprintf(stderr, use, CmdName);
    graphviz_exit(v);
}
 
static char *cmdName(char *path)
{
    char *sp;
 
    sp = strrchr(path, '/');
    if (sp)
        sp++;
    else
        sp = path;
#ifdef _WIN32
    char *sp2 = strrchr(sp, '\\');
    if (sp2 != NULL)
        sp = sp2 + 1;
#endif
    return sp;
}
 
static void checkInput(void)
{
    char *ep;
 
    ep = strrchr(*Files, '.');
    if (!ep)
        return;
    ep++;
    if (strcmp(ep, "gv") == 0)
        act = ToGXL;
    else if (strcmp(ep, "dot") == 0)
        act = ToGXL;
    else if (strcmp(ep, "gxl") == 0)
        act = ToGV;
}
 
static void setAction(void)
{
    if (gv_tolower(CmdName[0]) == 'd') 
        act = ToGXL;
    else if (gv_tolower(CmdName[0]) == 'g') {
        if (gv_tolower(CmdName[1]) == 'v')
            act = ToGXL;
        else
            act = ToGV;
    }
    else if (Files)
        checkInput();
 
    if (act == Unset) {
        fprintf(stderr, "Cannot determine conversion type\n");
        usage(1);
    }
}
 
static void initargs(int argc, char **argv)
{
    int c;
 
    CmdName = cmdName(argv[0]);
    opterr = 0;
    while ((c = getopt(argc, argv, ":gdo:")) != -1) {
        switch (c) {
        case 'd':
            act = ToGV;
            break;
        case 'g':
            act = ToGXL;
            break;
        case 'o':
            if (outFile != NULL)
                fclose(outFile);
            outFile = openFile(CmdName, optarg, "w");
            break;
        case ':':
            fprintf(stderr, "%s: option -%c missing argument\n", CmdName, optopt);
            break;
        case '?':
            if (optopt == '?')
                usage(0);
            else {
                fprintf(stderr, "%s: option -%c unrecognized\n", CmdName,
                        optopt);
                graphviz_exit(1);
            }
            break;
        default:
            fprintf(stderr, "cvtgxl: unexpected error\n");
            graphviz_exit(EXIT_FAILURE);
        }
    }
 
    argv += optind;
    argc -= optind;
 
    if (argc > 0)
        Files = argv;
    if (!outFile)
        outFile = stdout;
    if (act == Unset)
        setAction();
}
 
int main(int argc, char **argv)
{
    Agraph_t *G;
    Agraph_t *prev = 0;
 
    initargs(argc, argv);
    if (act == ToGXL) {
        ingraph_state ig;
        newIngraph(&ig, Files);
 
        while ((G = nextGraph(&ig))) {
            if (prev)
                agclose(prev);
            prev = G;
            gv_to_gxl(G, outFile);
            fflush(outFile);
        }
    } else {
#ifdef HAVE_EXPAT
        FILE *inFile;
        while ((inFile = getFile())) {
            while ((G = gxl_to_gv(inFile))) {
                if (prev)
                    agclose(prev);
                prev = G;
                agwrite(G, outFile);
                fflush(outFile);
            }
        }
#else
        fputs("cvtgxl: not configured for conversion from GXL to GV\n",
              stderr);
        graphviz_exit(1);
 
#endif
    }
    graphviz_exit(0);
}