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File: [cvsweb.bsd.lv] / mandoc / manpath.c (download)

Revision 1.35, Sat Jul 1 09:47:30 2017 UTC (4 years, 5 months ago) by schwarze
Branch: MAIN
CVS Tags: VERSION_1_14_4, VERSION_1_14_3, VERSION_1_14_2
Changes since 1.34: +8 -1 lines

Basic reporting of .Xrs to manual pages that don't exist
in the base system, inspired by mdoclint(1).

We are able to do this because (1) the -mdoc parser, the -Tlint validator,
and the man(1) manual page lookup code are all in the same program
and (2) the mandoc.db(5) database format allows fast lookup.

Feedback from, previous versions tested by, and OK jmc@.

A few features will be added to this in the tree, step by step.

/*	$Id: manpath.c,v 1.35 2017/07/01 09:47:30 schwarze Exp $ */
/*
 * Copyright (c) 2011, 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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 AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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 "config.h"

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#if HAVE_ERR
#include <err.h>
#endif
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "mandoc_aux.h"
#include "manconf.h"

static	void	 manconf_file(struct manconf *, const char *);
static	void	 manpath_add(struct manpaths *, const char *, int);
static	void	 manpath_parseline(struct manpaths *, char *, int);


void
manconf_parse(struct manconf *conf, const char *file,
		char *defp, char *auxp)
{
	char		*insert;

	/* Always prepend -m. */
	manpath_parseline(&conf->manpath, auxp, 1);

	/* If -M is given, it overrides everything else. */
	if (NULL != defp) {
		manpath_parseline(&conf->manpath, defp, 1);
		return;
	}

	/* MANPATH and man.conf(5) cooperate. */
	defp = getenv("MANPATH");
	if (NULL == file)
		file = MAN_CONF_FILE;

	/* No MANPATH; use man.conf(5) only. */
	if (NULL == defp || '\0' == defp[0]) {
		manconf_file(conf, file);
		return;
	}

	/* Prepend man.conf(5) to MANPATH. */
	if (':' == defp[0]) {
		manconf_file(conf, file);
		manpath_parseline(&conf->manpath, defp, 0);
		return;
	}

	/* Append man.conf(5) to MANPATH. */
	if (':' == defp[strlen(defp) - 1]) {
		manpath_parseline(&conf->manpath, defp, 0);
		manconf_file(conf, file);
		return;
	}

	/* Insert man.conf(5) into MANPATH. */
	insert = strstr(defp, "::");
	if (NULL != insert) {
		*insert++ = '\0';
		manpath_parseline(&conf->manpath, defp, 0);
		manconf_file(conf, file);
		manpath_parseline(&conf->manpath, insert + 1, 0);
		return;
	}

	/* MANPATH overrides man.conf(5) completely. */
	manpath_parseline(&conf->manpath, defp, 0);
}

void
manpath_base(struct manpaths *dirs)
{
	char path_base[] = MANPATH_BASE;
	manpath_parseline(dirs, path_base, 0);
}

/*
 * Parse a FULL pathname from a colon-separated list of arrays.
 */
static void
manpath_parseline(struct manpaths *dirs, char *path, int complain)
{
	char	*dir;

	if (NULL == path)
		return;

	for (dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
		manpath_add(dirs, dir, complain);
}

/*
 * Add a directory to the array, ignoring bad directories.
 * Grow the array one-by-one for simplicity's sake.
 */
static void
manpath_add(struct manpaths *dirs, const char *dir, int complain)
{
	char		 buf[PATH_MAX];
	struct stat	 sb;
	char		*cp;
	size_t		 i;

	if (NULL == (cp = realpath(dir, buf))) {
		if (complain)
			warn("manpath: %s", dir);
		return;
	}

	for (i = 0; i < dirs->sz; i++)
		if (0 == strcmp(dirs->paths[i], dir))
			return;

	if (stat(cp, &sb) == -1) {
		if (complain)
			warn("manpath: %s", dir);
		return;
	}

	dirs->paths = mandoc_reallocarray(dirs->paths,
	    dirs->sz + 1, sizeof(char *));

	dirs->paths[dirs->sz++] = mandoc_strdup(cp);
}

void
manconf_free(struct manconf *conf)
{
	size_t		 i;

	for (i = 0; i < conf->manpath.sz; i++)
		free(conf->manpath.paths[i]);

	free(conf->manpath.paths);
	free(conf->output.includes);
	free(conf->output.man);
	free(conf->output.paper);
	free(conf->output.style);
}

static void
manconf_file(struct manconf *conf, const char *file)
{
	const char *const toks[] = { "manpath", "output", "_whatdb" };
	char manpath_default[] = MANPATH_DEFAULT;

	FILE		*stream;
	char		*line, *cp, *ep;
	size_t		 linesz, tok, toklen;
	ssize_t		 linelen;

	if ((stream = fopen(file, "r")) == NULL)
		goto out;

	line = NULL;
	linesz = 0;

	while ((linelen = getline(&line, &linesz, stream)) != -1) {
		cp = line;
		ep = cp + linelen - 1;
		while (ep > cp && isspace((unsigned char)*ep))
			*ep-- = '\0';
		while (isspace((unsigned char)*cp))
			cp++;
		if (cp == ep || *cp == '#')
			continue;

		for (tok = 0; tok < sizeof(toks)/sizeof(toks[0]); tok++) {
			toklen = strlen(toks[tok]);
			if (cp + toklen < ep &&
			    isspace((unsigned char)cp[toklen]) &&
			    strncmp(cp, toks[tok], toklen) == 0) {
				cp += toklen;
				while (isspace((unsigned char)*cp))
					cp++;
				break;
			}
		}

		switch (tok) {
		case 2:  /* _whatdb */
			while (ep > cp && ep[-1] != '/')
				ep--;
			if (ep == cp)
				continue;
			*ep = '\0';
			/* FALLTHROUGH */
		case 0:  /* manpath */
			manpath_add(&conf->manpath, cp, 0);
			*manpath_default = '\0';
			break;
		case 1:  /* output */
			manconf_output(&conf->output, cp, 1);
			break;
		default:
			break;
		}
	}
	free(line);
	fclose(stream);

out:
	if (*manpath_default != '\0')
		manpath_parseline(&conf->manpath, manpath_default, 0);
}

int
manconf_output(struct manoutput *conf, const char *cp, int fromfile)
{
	const char *const toks[] = {
	    "includes", "man", "paper", "style",
	    "indent", "width", "fragment", "mdoc", "noval"
	};

	const char	*errstr;
	char		*oldval;
	size_t		 len, tok;

	for (tok = 0; tok < sizeof(toks)/sizeof(toks[0]); tok++) {
		len = strlen(toks[tok]);
		if ( ! strncmp(cp, toks[tok], len) &&
		    strchr(" =	", cp[len]) != NULL) {
			cp += len;
			if (*cp == '=')
				cp++;
			while (isspace((unsigned char)*cp))
				cp++;
			break;
		}
	}

	if (tok < 6 && *cp == '\0') {
		warnx("-O %s=?: Missing argument value", toks[tok]);
		return -1;
	}
	if ((tok == 6 || tok == 7) && *cp != '\0') {
		warnx("-O %s: Does not take a value: %s", toks[tok], cp);
		return -1;
	}

	switch (tok) {
	case 0:
		if (conf->includes != NULL) {
			oldval = mandoc_strdup(conf->includes);
			break;
		}
		conf->includes = mandoc_strdup(cp);
		return 0;
	case 1:
		if (conf->man != NULL) {
			oldval = mandoc_strdup(conf->man);
			break;
		}
		conf->man = mandoc_strdup(cp);
		return 0;
	case 2:
		if (conf->paper != NULL) {
			oldval = mandoc_strdup(conf->paper);
			break;
		}
		conf->paper = mandoc_strdup(cp);
		return 0;
	case 3:
		if (conf->style != NULL) {
			oldval = mandoc_strdup(conf->style);
			break;
		}
		conf->style = mandoc_strdup(cp);
		return 0;
	case 4:
		if (conf->indent) {
			mandoc_asprintf(&oldval, "%zu", conf->indent);
			break;
		}
		conf->indent = strtonum(cp, 0, 1000, &errstr);
		if (errstr == NULL)
			return 0;
		warnx("-O indent=%s is %s", cp, errstr);
		return -1;
	case 5:
		if (conf->width) {
			mandoc_asprintf(&oldval, "%zu", conf->width);
			break;
		}
		conf->width = strtonum(cp, 1, 1000, &errstr);
		if (errstr == NULL)
			return 0;
		warnx("-O width=%s is %s", cp, errstr);
		return -1;
	case 6:
		conf->fragment = 1;
		return 0;
	case 7:
		conf->mdoc = 1;
		return 0;
	case 8:
		conf->noval = 1;
		return 0;
	default:
		if (fromfile)
			warnx("-O %s: Bad argument", cp);
		return -1;
	}
	if (fromfile == 0)
		warnx("-O %s=%s: Option already set to %s",
		    toks[tok], cp, oldval);
	free(oldval);
	return -1;
}