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To be fully compatibly with the GNU RCS tools we need to have the
same way of parsing commandline options. Since getopt(3) allows spaces
between arguments and GNU RCS tools does not we needed to roll out our
own way of option handling, and here it is.

ok niallo@

/*	$OpenBSD: ident.c,v 1.5 2005/10/13 12:35:30 joris Exp $	*/
/*
 * Copyright (c) 2005 Xavier Santolaria <xsa@openbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "log.h"
#include "rcs.h"
#include "rcsprog.h"

#define KEYDELIM	'$'	/* keywords delimitor */
#define VALDELIM	':'	/* values delimitor */

static int found = 0;

static int	ident_file(const char *, FILE *);
static int	ident_line(FILE *);

int
ident_main(int argc, char **argv)
{
	int i, ch;
	FILE *fp;

	while ((ch = rcs_getopt(argc, argv, "qV")) != -1) {
		switch(ch) {
		case 'q':
			verbose = 0;
			break;
		case 'V':
			printf("%s\n", rcs_version);
			exit(0);
		default:
			(usage)();
			exit(1);
		}
	}

	argc -= rcs_optind;
	argv += rcs_optind;

	if (argc == 0)
		ident_file(NULL, stdin);
	else {
		for (i = 0; i < argc; i++) {
			if ((fp = fopen(argv[i], "r")) == NULL) {
				cvs_log(LP_ERRNO, "%s", argv[i]);
				continue;
			}

			ident_file(argv[i], fp);
			fclose(fp);

			if (found == 0)
				cvs_log(LP_WARN, "no id keywords in %s", argv[i]);
			found = 0;
		}
	}

	return (0);
}


static int
ident_file(const char *filename, FILE *fp)
{
	int c;

	if (fp != stdin)
		printf("%s:\n", filename);

	for (c = 0; c != EOF; (c = getc(fp))) {
		if ((feof(fp)) || (ferror(fp)))
			break;
		if (c == KEYDELIM)
			ident_line(fp);
	}

	return (0);
}

static int
ident_line(FILE *fp)
{
	int c;
	char *p, linebuf[1024];

	p = linebuf;

	while ((c = getc(fp)) != VALDELIM) {
		if ((c == EOF) && (feof(fp) | ferror(fp)))
			return (0);

		if (isalpha(c))
			*(p++) = c;
		else
			return (0);
	}

	*(p++) = VALDELIM;

	while ((c = getc(fp)) != KEYDELIM) {
		if ((c == EOF) && (feof(fp) | ferror(fp)))
			return (0);

		if (c == '\n')
			return (0);

		*(p++) = c;
	}

	if (p[-1] != ' ')
		return (0);

	/* append trailing KEYDELIM */
	*(p++) = c;
	*p = '\0';

	found++;
	printf("     %c%s\n", KEYDELIM, linebuf);

	return (0);
}

void
ident_usage(void)
{
	fprintf(stderr,
	    "usage: ident [-qV] file ...\n");
}