Handle -h and --help according to GNU Coding Standards (#17104)

[fontconfig.git] / fc-list / fc-list.c

/*
 * fontconfig/fc-list/fc-list.c
 *
 * Copyright © 2002 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include <fontconfig/fontconfig.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#else
#ifdef linux
#define HAVE_GETOPT_LONG 1
#endif
#define HAVE_GETOPT 1
#endif

#ifndef HAVE_GETOPT
#define HAVE_GETOPT 0
#endif
#ifndef HAVE_GETOPT_LONG
#define HAVE_GETOPT_LONG 0
#endif

#if HAVE_GETOPT_LONG
#undef  _GNU_SOURCE
#define _GNU_SOURCE
#include <getopt.h>
const struct option longopts[] = {
    {"version", 0, 0, 'V'},
    {"verbose", 0, 0, 'v'},
    {"help", 0, 0, 'h'},
    {NULL,0,0,0},
};
#else
#if HAVE_GETOPT
extern char *optarg;
extern int optind, opterr, optopt;
#endif
#endif

static void
usage (char *program, int error)
{
    FILE *file = error ? stderr : stdout;
#if HAVE_GETOPT_LONG
    fprintf (file, "usage: %s [-vVh] [--verbose] [--version] [--help] [pattern] {element ...} \n",
	     program);
#else
    fprintf (file, "usage: %s [-vVh] [pattern] {element ...} \n",
	     program);
#endif
    fprintf (file, "List fonts matching [pattern]\n");
    fprintf (file, "\n");
#if HAVE_GETOPT_LONG
    fprintf (file, "  -v, --verbose        display entire font pattern\n");
    fprintf (file, "  -V, --version        display font config version and exit\n");
    fprintf (file, "  -h, --help           display this help and exit\n");
#else
    fprintf (file, "  -v         (verbose) display entire font pattern\n");
    fprintf (file, "  -V         (version) display font config version and exit\n");
    fprintf (file, "  -h         (help)    display this help and exit\n");
#endif
    exit (error);
}

int
main (int argc, char **argv)
{
    int		verbose = 0;
    int		i;
    FcObjectSet *os = 0;
    FcFontSet	*fs;
    FcPattern   *pat;
#if HAVE_GETOPT_LONG || HAVE_GETOPT
    int		c;

#if HAVE_GETOPT_LONG
    while ((c = getopt_long (argc, argv, "Vvh", longopts, NULL)) != -1)
#else
    while ((c = getopt (argc, argv, "Vvh")) != -1)
#endif
    {
	switch (c) {
	case 'V':
	    fprintf (stderr, "fontconfig version %d.%d.%d\n", 
		     FC_MAJOR, FC_MINOR, FC_REVISION);
	    exit (0);
	case 'v':
	    verbose = 1;
	    break;
	case 'h':
	    usage (argv[0], 0);
	default:
	    usage (argv[0], 1);
	}
    }
    i = optind;
#else
    i = 1;
#endif

    if (!FcInit ())
    {
	fprintf (stderr, "Can't init font config library\n");
	return 1;
    }
    if (argv[i])
    {
	pat = FcNameParse ((FcChar8 *) argv[i]);
	if (!verbose)
	    while (argv[++i])
	    {
		if (!os)
		    os = FcObjectSetCreate ();
		FcObjectSetAdd (os, argv[i]);
	    }
    }
    else
	pat = FcPatternCreate ();
    
    if (!verbose && !os)
	os = FcObjectSetBuild (FC_FAMILY, FC_STYLE, (char *) 0);
    fs = FcFontList (0, pat, os);
    if (os)
	FcObjectSetDestroy (os);
    if (pat)
	FcPatternDestroy (pat);

    if (fs)
    {
	int	j;

	for (j = 0; j < fs->nfont; j++)
	{
	    FcChar8 *font;
	    FcChar8 *file;

	    if (verbose)
		FcPatternPrint (fs->fonts[j]);
	    else
	    {
		font = FcNameUnparse (fs->fonts[j]);
		if (FcPatternGetString (fs->fonts[j], FC_FILE, 0, &file) == FcResultMatch)
		    printf ("%s: ", file);
		printf ("%s\n", font);
		free (font);
	    }
	}
	FcFontSetDestroy (fs);
    }

    FcFini ();

    return 0;
}