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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: tag.c,v 1.81 2015/01/16 06:40:07 deraadt Exp $	*/
/*
 * Copyright (c) 2006 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 <errno.h>
#include <string.h>
#include <unistd.h>

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

#define T_CHECK_UPTODATE	0x01
#define T_DELETE		0x02
#define T_FORCE_MOVE		0x04
#define T_BRANCH		0x08

void	cvs_tag_check_files(struct cvs_file *);
void	cvs_tag_local(struct cvs_file *);

static int tag_del(struct cvs_file *);
static int tag_add(struct cvs_file *);

struct file_info_list	files_info;

static int	 runflags = 0;
static char	*tag = NULL;
static char	*tag_date = NULL;
static char	*tag_name = NULL;
static char	*tag_oldname = NULL;

struct cvs_cmd cvs_cmd_rtag = {
	CVS_OP_RTAG, CVS_LOCK_REPO, "rtag",
	{ "rt", "rfreeze" },
	"Add a symbolic tag to a module",
	"[-bcdFflR] [-D date | -r rev] symbolic_tag module ...",
	"bcD:dFflRr:",
	NULL,
	cvs_tag
};

struct cvs_cmd cvs_cmd_tag = {
	CVS_OP_TAG, CVS_USE_WDIR | CVS_LOCK_REPO, "tag",
	{ "ta", "freeze" },
	"Add a symbolic tag to checked out version of files",
	"[-bcdFflR] [-D date | -r rev] symbolic_tag [file ...]",
	"bcD:dFflRr:",
	NULL,
	cvs_tag
};

int
cvs_tag(int argc, char **argv)
{
	int ch, flags, i;
	char repo[PATH_MAX];
	char *arg = ".";
	struct cvs_recursion cr;
	struct trigger_list *line_list;

	flags = CR_RECURSE_DIRS;

	while ((ch = getopt(argc, argv, cvs_cmdop == CVS_OP_TAG ?
	    cvs_cmd_tag.cmd_opts : cvs_cmd_rtag.cmd_opts)) != -1) {
		switch (ch) {
		case 'b':
			runflags |= T_BRANCH;
			break;
		case 'c':
			runflags |= T_CHECK_UPTODATE;
			break;
		case 'D':
			tag_date = optarg;
			break;
		case 'd':
			runflags |= T_DELETE;
			break;
		case 'F':
			runflags |= T_FORCE_MOVE;
			break;
		case 'l':
			flags &= ~CR_RECURSE_DIRS;
			break;
		case 'R':
			flags |= CR_RECURSE_DIRS;
			break;
		case 'r':
			tag_oldname = optarg;
			break;
		default:
			fatal("%s", cvs_cmdop == CVS_OP_TAG ?
			    cvs_cmd_tag.cmd_synopsis :
			    cvs_cmd_rtag.cmd_synopsis);
		}
	}

	argc -= optind;
	argv += optind;

	if (cvs_cmdop == CVS_OP_RTAG) {
		flags |= CR_REPO;

		if (argc < 2)
			fatal("%s", cvs_cmd_rtag.cmd_synopsis);

		for (i = 1; i < argc; i++) {
			if (argv[i][0] == '/')
				fatal("Absolute path name is invalid: %s",
				    argv[i]);
		}
        } else if (cvs_cmdop == CVS_OP_TAG && argc == 0)
		fatal("%s", cvs_cmd_tag.cmd_synopsis);

	tag_name = argv[0];
	argc--;
	argv++;

	if (!rcs_sym_check(tag_name))
		fatal("tag `%s' must not contain the characters `%s'",
		    tag_name, RCS_SYM_INVALCHAR);

	if (tag_oldname != NULL) {
		if (runflags & T_DELETE)
			tag_oldname = NULL;
		else
			tag = tag_oldname;
	}

	if (tag_date != NULL) {
		if (runflags & T_DELETE)
			tag_date = NULL;
		else
			tag = tag_date;
	}

	if (tag_oldname != NULL && tag_date != NULL)
		fatal("-r and -D options are mutually exclusive");

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

	if (current_cvsroot->cr_method != CVS_METHOD_LOCAL) {
		cvs_client_connect_to_server();
		cr.fileproc = cvs_client_sendfile;

		if (runflags & T_BRANCH)
			cvs_client_send_request("Argument -b");

		if (runflags & T_CHECK_UPTODATE)
			cvs_client_send_request("Argument -c");

		if (runflags & T_DELETE)
			cvs_client_send_request("Argument -d");

		if (runflags & T_FORCE_MOVE)
			cvs_client_send_request("Argument -F");

		if (!(flags & CR_RECURSE_DIRS))
			cvs_client_send_request("Argument -l");

		if (tag_date != NULL)
			cvs_client_send_request("Argument -D%s", tag_date);

		if (tag_oldname != NULL)
			cvs_client_send_request("Argument -r%s", tag_oldname);

		cvs_client_send_request("Argument %s", tag_name);
	} else {
		if (cvs_cmdop == CVS_OP_RTAG &&
		    chdir(current_cvsroot->cr_dir) == -1)
			fatal("cvs_tag: %s", strerror(errno));

	}

	cr.flags = flags;

	cvs_get_repository_name(".", repo, PATH_MAX);
	line_list = cvs_trigger_getlines(CVS_PATH_TAGINFO, repo);
	if (line_list != NULL) {
		TAILQ_INIT(&files_info);
		cr.fileproc = cvs_tag_check_files;
		if (argc > 0)
			cvs_file_run(argc, argv, &cr);
		else
			cvs_file_run(1, &arg, &cr);

		if (cvs_trigger_handle(CVS_TRIGGER_TAGINFO, repo, NULL,
		    line_list, &files_info)) {
			cvs_log(LP_ERR, "Pre-tag check failed");
			cvs_trigger_freelist(line_list);
			goto bad;
		}
		cvs_trigger_freelist(line_list);
	}

	cr.fileproc = cvs_tag_local;

	if (cvs_cmdop == CVS_OP_TAG ||
	    current_cvsroot->cr_method == CVS_METHOD_LOCAL) {
		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((cvs_cmdop == CVS_OP_RTAG) ?
		    "rtag" : "tag");

		cvs_client_get_responses();
	}

bad:
	if (line_list != NULL)
		cvs_trigger_freeinfo(&files_info);

	return (0);
}

void
cvs_tag_check_files(struct cvs_file *cf)
{
	RCSNUM *srev = NULL, *rev = NULL;
	char rbuf[CVS_REV_BUFSZ];
	struct file_info *fi;

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

	cvs_file_classify(cf, tag);

	if (cf->file_type == CVS_DIR)
		return;

	if (runflags & T_CHECK_UPTODATE) {
		if (cf->file_status != FILE_UPTODATE &&
		    cf->file_status != FILE_CHECKOUT &&
		    cf->file_status != FILE_PATCH) {
			return;
		}
	}

	switch (cf->file_status) {
	case FILE_ADDED:
	case FILE_REMOVED:
		return;
	default:
		break;
	}

	if (cvs_cmdop == CVS_OP_TAG) {
		if (cf->file_ent == NULL)
			return;
		srev = cf->file_ent->ce_rev;
	} else
		srev = cf->file_rcsrev;

	rcsnum_tostr(srev, rbuf, sizeof(rbuf));
	fi = xcalloc(1, sizeof(*fi));
	fi->nrevstr = xstrdup(rbuf);
	fi->file_path = xstrdup(cf->file_path);

	if (tag_oldname != NULL)
		fi->tag_old = xstrdup(tag_oldname);
	else if (tag_date != NULL)
		fi->tag_old = xstrdup(tag_date);

	if ((rev = rcs_sym_getrev(cf->file_rcs, tag_name)) != NULL) {
		if (!rcsnum_differ(srev, rev))
			goto bad;
		rcsnum_tostr(rev, rbuf, sizeof(rbuf));
		fi->crevstr = xstrdup(rbuf);
		rcsnum_free(rev);
	} else if (runflags & T_DELETE)
		goto bad;

	fi->tag_new = xstrdup(tag_name);

	if (runflags & T_BRANCH)
		fi->tag_type = 'T';
	else if (runflags & T_DELETE)
		fi->tag_type = '?';
	else
		fi->tag_type = 'N';

	if (runflags & T_FORCE_MOVE)
		fi->tag_op = "mov";
	else if (runflags & T_DELETE)
		fi->tag_op = "del";
	else
		fi->tag_op = "add";

	TAILQ_INSERT_TAIL(&files_info, fi, flist);
	return;

bad:
	if (fi->file_path != NULL)
		xfree(fi->file_path);
	if (fi->crevstr != NULL)
		xfree(fi->crevstr);
	if (fi->nrevstr != NULL)
		xfree(fi->nrevstr);
	if (fi->tag_new != NULL)
		xfree(fi->tag_new);
	if (fi->tag_old != NULL)
		xfree(fi->tag_old);
	if (rev != NULL)
		rcsnum_free(rev);
	xfree(fi);
}

void
cvs_tag_local(struct cvs_file *cf)
{
	cvs_log(LP_TRACE, "cvs_tag_local(%s)", cf->file_path);

	cvs_file_classify(cf, tag);

	if (cf->file_type == CVS_DIR) {
		if (verbosity > 1) {
			cvs_log(LP_NOTICE, "%s %s",
			    (runflags & T_DELETE) ? "Untagging" : "Tagging",
			    cf->file_path);
		}
		return;
	}

	if (runflags & T_CHECK_UPTODATE) {
		if (cf->file_status != FILE_UPTODATE &&
		    cf->file_status != FILE_CHECKOUT &&
		    cf->file_status != FILE_PATCH) {
			cvs_log(LP_NOTICE,
			    "%s is locally modified", cf->file_path);
			return;
		}
	}

	if (runflags & T_DELETE) {
		if (tag_del(cf) == 0) {
			if (verbosity > 0)
				cvs_printf("D %s\n", cf->file_path);
		}
		return;
	}

	switch (cf->file_status) {
	case FILE_ADDED:
		if (verbosity > 1) {
			cvs_log(LP_NOTICE,
			    "couldn't tag added but un-commited file `%s'",
			    cf->file_path);
		}
		break;
	case FILE_REMOVED:
		if (verbosity > 1) {
			cvs_log(LP_NOTICE,
			    "skipping removed but un-commited file `%s'",
			    cf->file_path);
		}
		break;
	case FILE_CHECKOUT:
	case FILE_MODIFIED:
	case FILE_PATCH:
	case FILE_UPTODATE:
		if (tag_add(cf) == 0) {
			if (verbosity > 0)
				cvs_printf("T %s\n", cf->file_path);
			cvs_history_add(CVS_HISTORY_TAG, cf, tag_name);
		}
		break;
	default:
		break;
	}
}

static int
tag_del(struct cvs_file *cf)
{
	if (cf->file_rcs == NULL)
		return (-1);

	if (cvs_noexec == 1)
		return (0);

	return (rcs_sym_remove(cf->file_rcs, tag_name));
}

static int
tag_add(struct cvs_file *cf)
{
	int ret;
	char revbuf[CVS_REV_BUFSZ], trevbuf[CVS_REV_BUFSZ];
	RCSNUM *srev, *trev;
	struct rcs_sym *sym;

	if (cf->file_rcs == NULL) {
		if (verbosity > 1)
			cvs_log(LP_NOTICE, "cannot find revision "
			    "control file for `%s'", cf->file_name);
		return (-1);
	}

	if (cvs_cmdop == CVS_OP_TAG) {
		if (cf->file_ent == NULL)
			return (-1);
		srev = cf->file_ent->ce_rev;
	} else
		srev = cf->file_rcsrev;

	if (cvs_noexec == 1)
		return (0);

	(void)rcsnum_tostr(srev, revbuf, sizeof(revbuf));

	trev = rcs_sym_getrev(cf->file_rcs, tag_name);
	if (trev != NULL) {
		if (rcsnum_cmp(srev, trev, 0) == 0) {
			rcsnum_free(trev);
			return (-1);
		}
		(void)rcsnum_tostr(trev, trevbuf, sizeof(trevbuf));
		rcsnum_free(trev);

		if (!(runflags & T_FORCE_MOVE)) {
			cvs_printf("W %s : %s ", cf->file_path, tag_name);
			cvs_printf("already exists on version %s", trevbuf);
			cvs_printf(" : NOT MOVING tag to version %s\n", revbuf);

			return (-1);
		} else {
			sym = rcs_sym_get(cf->file_rcs, tag_name);
			rcsnum_cpy(srev, sym->rs_num, 0);
			cf->file_rcs->rf_flags &= ~RCS_SYNCED;

			return (0);
		}
	}

	if (runflags & T_BRANCH) {
		if ((trev = rcs_branch_new(cf->file_rcs, srev)) == NULL)
			fatal("Cannot create a new branch");
	} else {
		trev = rcsnum_alloc();
		rcsnum_cpy(srev, trev, 0);
	}

	if ((ret = rcs_sym_add(cf->file_rcs, tag_name, trev)) != 0) {
		if (ret != 1) {
			cvs_log(LP_NOTICE,
			    "failed to set tag %s to revision %s in %s",
			    tag_name, revbuf, cf->file_rcs->rf_path);
		}
		rcsnum_free(trev);
		return (-1);
	}

	rcsnum_free(trev);
	return (0);
}