usr/src/usr.bin/man/config.c

/*
 * Copyright (c) 1989, 1993, 1995
 *      The Regents of the University of California.  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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#ifndef lint
static char sccsid[] = "@(#)config.c    8.8 (Berkeley) 1/31/95";
#endif /* not lint */

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

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "config.h"
#include "pathnames.h"

struct _head head;

/*
 * config --
 *
 * Read the configuration file and build a doubly linked
 * list that looks like:
 *
 *      tag1 <-> record <-> record <-> record
 *      |
 *      tag2 <-> record <-> record <-> record
 */
void
config(fname)
        char *fname;
{
        TAG *tp;
        ENTRY *ep;
        FILE *cfp;
        size_t len;
        int lcnt;
        char *p, *t;

        if (fname == NULL)
                fname = _PATH_MANCONF;
        if ((cfp = fopen(fname, "r")) == NULL)
                err(1, "%s", fname);
        TAILQ_INIT(&head);
        for (lcnt = 1; (p = fgetln(cfp, &len)) != NULL; ++lcnt) {
                if (len == 1)                   /* Skip empty lines. */
                        continue;
                if (p[len - 1] != '\n') {       /* Skip corrupted lines. */
                        warnx("%s: line %d corrupted", fname, lcnt);
                        continue;
                }
                p[len - 1] = '\0';              /* Terminate the line. */

                                                /* Skip leading space. */
                for (; *p != '\0' && isspace(*p); ++p);
                                                /* Skip empty/comment lines. */
                if (*p == '\0' || *p == '#')
                        continue;
                                                /* Find first token. */
                for (t = p; *t && !isspace(*t); ++t);
                if (*t == '\0')                 /* Need more than one token.*/
                        continue;
                *t = '\0';

                for (tp = head.tqh_first;       /* Find any matching tag. */
                    tp != NULL && strcmp(p, tp->s); tp = tp->q.tqe_next);

                if (tp == NULL)         /* Create a new tag. */
                        tp = addlist(p);

                /*
                 * Attach new records.  The keyword _build takes the rest of
                 * the line as a single entity, everything else is white
                 * space separated.  The reason we're not just using strtok(3)
                 * for all of the parsing is so we don't get caught if a line
                 * has only a single token on it.
                 */
                if (!strcmp(p, "_build")) {
                        while (*++t && isspace(*t));
                        if ((ep = malloc(sizeof(ENTRY))) == NULL ||
                            (ep->s = strdup(t)) == NULL)
                                err(1, NULL);
                        TAILQ_INSERT_TAIL(&tp->list, ep, q);
                } else for (++t; (p = strtok(t, " \t\n")) != NULL; t = NULL) {
                        if ((ep = malloc(sizeof(ENTRY))) == NULL ||
                            (ep->s = strdup(p)) == NULL)
                                err(1, NULL);
                        TAILQ_INSERT_TAIL(&tp->list, ep, q);
                }
        }

        fclose(cfp);
}

/*
 * addlist --
 *      Add a tag to the list.
 */
TAG *
addlist(name)
        char *name;
{
        TAG *tp;

        if ((tp = calloc(1, sizeof(TAG))) == NULL ||
            (tp->s = strdup(name)) == NULL)
                err(1, NULL);
        TAILQ_INIT(&tp->list);
        TAILQ_INSERT_TAIL(&head, tp, q);
        return (tp);
}

/*
 * getlist --
 *      Return the linked list of entries for a tag if it exists.
 */
TAG *
getlist(name)
        char *name;
{
        TAG *tp;

        for (tp = head.tqh_first; tp != NULL; tp = tp->q.tqe_next)
                if (!strcmp(name, tp->s))
                        return (tp);
        return (NULL);
}

void
debug(l)
        char *l;
{
        TAG *tp;
        ENTRY *ep;

        (void)printf("%s ===============\n", l);
        for (tp = head.tqh_first; tp != NULL; tp = tp->q.tqe_next) {
                printf("%s\n", tp->s);
                for (ep = tp->list.tqh_first; ep != NULL; ep = ep->q.tqe_next)
                        printf("\t%s\n", ep->s);
        }
}