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Conforming to RCS specification, it is possible but unlikely to encounter
an RCS file which has no head revision set.  Some commands actually can
work with them (log, status) so support these files. Fixes  A LOT of
possible segmentation faults.

ok joris

/*	$OpenBSD: status.c,v 1.88 2008/06/14 04:34:08 tobias Exp $	*/
/*
 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
 * Copyright (c) 2005-2008 Xavier Santolaria <xsa@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, 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 <string.h>
#include <time.h>
#include <unistd.h>

#include "cvs.h"
#include "remote.h"

void	cvs_status_local(struct cvs_file *);

static int show_sym = 0;

struct cvs_cmd cvs_cmd_status = {
	CVS_OP_STATUS, CVS_USE_WDIR, "status",
	{ "st", "stat" },
	"Display status information on checked out files",
	"[-lRv]",
	"lRv",
	NULL,
	cvs_status
};

#define CVS_STATUS_SEP	\
	"==================================================================="

const char *status_tab[] = {
	"Unknown",
	"Locally Added",
	"Locally Removed",
	"Locally Modified",
	"Up-to-date",
	"Needs Checkout",
	"Needs Checkout",
	"Needs Merge",
	"Needs Patch",
	"Entry Invalid",
	"Unresolved Conflict",
	"Classifying error",
};

int
cvs_status(int argc, char **argv)
{
	int ch, flags;
	char *arg = ".";
	struct cvs_recursion cr;

	flags = CR_RECURSE_DIRS;

	while ((ch = getopt(argc, argv, cvs_cmd_status.cmd_opts)) != -1) {
		switch (ch) {
		case 'l':
			flags &= ~CR_RECURSE_DIRS;
			break;
		case 'R':
			flags |= CR_RECURSE_DIRS;
			break;
		case 'v':
			show_sym = 1;
			break;
		default:
			fatal("%s", cvs_cmd_status.cmd_synopsis);
		}
	}

	argc -= optind;
	argv += optind;

	cr.enterdir = NULL;
	cr.leavedir = NULL;

	if (current_cvsroot->cr_method == CVS_METHOD_LOCAL) {
		flags |= CR_REPO;
		cr.fileproc = cvs_status_local;
	} else {
		cvs_client_connect_to_server();
		if (!(flags & CR_RECURSE_DIRS))
			cvs_client_send_request("Argument -l");
		if (show_sym)
			cvs_client_send_request("Argument -v");
		cr.fileproc = cvs_client_sendfile;
	}

	cr.flags = flags;

	if (argc > 0)
		cvs_file_run(argc, argv, &cr);
	else
		cvs_file_run(1, &arg, &cr);

	if (current_cvsroot->cr_method != CVS_METHOD_LOCAL) {
		cvs_client_send_files(argv, argc);
		cvs_client_senddir(".");
		cvs_client_send_request("status");
		cvs_client_get_responses();
	}

	return (0);
}

void
cvs_status_local(struct cvs_file *cf)
{
	size_t len;
	RCSNUM *head;
	const char *status;
	char buf[128], timebuf[CVS_TIME_BUFSZ], revbuf[CVS_REV_BUFSZ];
	struct rcs_sym *sym;

	cvs_log(LP_TRACE, "cvs_status_local(%s)", cf->file_path);

	cvs_file_classify(cf, cvs_directory_tag);

	if (cf->file_type == CVS_DIR) {
		if (verbosity > 1)
			cvs_log(LP_NOTICE, "Examining %s", cf->file_path);
		return;
	}

	if (cf->file_rcs != NULL)
		head = rcs_head_get(cf->file_rcs);
	else
		head = NULL;

	cvs_printf("%s\n", CVS_STATUS_SEP);

	if (cf->file_rcs != NULL && head == NULL)
		status = status_tab[FILE_UNKNOWN];
	else
		status = status_tab[cf->file_status];

	if (cf->file_status == FILE_MODIFIED &&
	    cf->file_ent->ce_conflict != NULL)
		status = "File had conflicts on merge";

	if (cf->fd == -1) {
		(void)xsnprintf(buf, sizeof(buf), "no file %s\t",
		    cf->file_name);
	} else
		if (strlcpy(buf, cf->file_name, sizeof(buf)) >= sizeof(buf))
			fatal("cvs_status_local: overflow");

	cvs_printf("File: %-17s\tStatus: %s\n\n", buf, status);

	if (cf->file_ent == NULL) {
		(void)xsnprintf(buf, sizeof(buf),
		    "No entry for %s", cf->file_name);
	} else if (cf->file_ent->ce_status == CVS_ENT_ADDED) {
		len = strlcpy(buf, "New file!", sizeof(buf));
		if (len >= sizeof(buf))
			fatal("cvs_status_local: truncation");
	} else {
		rcsnum_tostr(cf->file_ent->ce_rev, revbuf, sizeof(revbuf));

		if (cf->file_ent->ce_conflict == NULL) {
			ctime_r(&(cf->file_ent->ce_mtime), timebuf);
			if (timebuf[strlen(timebuf) - 1] == '\n')
				timebuf[strlen(timebuf) - 1] = '\0';
		} else {
			len = strlcpy(timebuf, cf->file_ent->ce_conflict,
			    sizeof(timebuf));
			if (len >= sizeof(timebuf))
				fatal("cvs_status_local: truncation");
		}

		(void)strlcpy(buf, revbuf, sizeof(buf));
		if (cvs_server_active == 0) {
			(void)strlcat(buf, "\t", sizeof(buf));
			(void)strlcat(buf, timebuf, sizeof(buf));
		}
	}

	cvs_printf("   Working revision:\t%s\n", buf);

	buf[0] = '\0';
	if (cf->file_rcs == NULL) {
		len = strlcat(buf, "No revision control file", sizeof(buf));
		if (len >= sizeof(buf))
			fatal("cvs_status_local: truncation");
	} else if (head == NULL) {
		len = strlcat(buf, "No head revision", sizeof(buf));
		if (len >= sizeof(buf))
			fatal("cvs_status_local: truncation");
	} else {
		rcsnum_tostr(head, revbuf, sizeof(revbuf));
		rcsnum_free(head);
		(void)xsnprintf(buf, sizeof(buf), "%s\t%s", revbuf,
		    cf->file_rpath);
	}

	cvs_printf("   Repository revision:\t%s\n", buf);

	if (cf->file_ent != NULL) {
		if (cf->file_ent->ce_tag != NULL)
			cvs_printf("   Sticky Tag:\t\t%s\n",
			    cf->file_ent->ce_tag);
		else if (verbosity > 0)
			cvs_printf("   Sticky Tag:\t\t(none)\n");

		if (cf->file_ent->ce_date != -1) {
			struct tm datetm;
			char datetmp[CVS_TIME_BUFSZ];

			gmtime_r(&(cf->file_ent->ce_date), &datetm);
                        (void)strftime(datetmp, sizeof(datetmp),
			    CVS_DATE_FMT, &datetm);

			cvs_printf("   Sticky Date:\t\t%s\n", datetmp);
		} else if (verbosity > 0)
			cvs_printf("   Sticky Date:\t\t(none)\n");

		if (cf->file_ent->ce_opts != NULL)
			cvs_printf("   Sticky Options:\t%s\n",
			    cf->file_ent->ce_opts);
		else if (verbosity > 0)
			cvs_printf("   Sticky Options:\t(none)\n");
	}

	if (cf->file_rcs != NULL && show_sym == 1) {
		cvs_printf("\n");
		cvs_printf("   Existing Tags:\n");

		if (!TAILQ_EMPTY(&(cf->file_rcs->rf_symbols))) {
			TAILQ_FOREACH(sym,
			    &(cf->file_rcs->rf_symbols), rs_list) {
				(void)rcsnum_tostr(sym->rs_num, revbuf,
				    sizeof(revbuf));

				cvs_printf("\t%-25s\t(%s: %s)\n", sym->rs_name,
				    RCSNUM_ISBRANCH(sym->rs_num) ? "branch" :
				    "revision", revbuf);
			 }
		} else
			cvs_printf("\tNo Tags Exist\n");
	}

	cvs_printf("\n");
}