251 lines
6.3 KiB
C
251 lines
6.3 KiB
C
/* $NetBSD: manconf.c,v 1.6 2008/03/08 15:48:27 christos Exp $ */
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/*
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* Copyright (c) 1989, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* manconf.c: provides interface for reading man.conf files
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*
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* note that this code is shared across all programs that read man.conf.
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* (currently: apropos, catman, makewhatis, man, and whatis...)
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "manconf.h"
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#include "pathnames.h"
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TAILQ_HEAD(_head, _tag);
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static struct _head head; /* 'head' -- top level data structure */
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/*
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* xstrdup: like strdup, but also returns length of string in lenp
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*/
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static char *
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xstrdup(const char *str, size_t *lenp)
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{
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size_t len;
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char *copy;
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len = strlen(str) + 1;
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copy = malloc(len);
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if (!copy)
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return NULL;
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(void)memcpy(copy, str, len);
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if (lenp)
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*lenp = len - 1; /* subtract out the null */
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return copy;
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}
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/*
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* config --
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*
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* Read the configuration file and build a doubly linked
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* list off of "head" that looks like:
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*
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* tag1 <-> entry <-> entry <-> entry
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* |
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* tag2 <-> entry <-> entry <-> entry
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*
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* note: will err/errx out on error (fopen or malloc failure)
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*/
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void
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config(const char *fname)
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{
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TAG *tp;
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FILE *cfp;
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size_t len;
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int lcnt;
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char *p, *t, type;
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if (fname == NULL)
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fname = _PATH_MANCONF;
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if ((cfp = fopen(fname, "r")) == NULL)
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err(EXIT_FAILURE, "%s", fname);
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TAILQ_INIT(&head);
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for (lcnt = 1; (p = fgetln(cfp, &len)) != NULL; ++lcnt) {
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if (len == 1) /* Skip empty lines. */
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continue;
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if (p[len - 1] != '\n') { /* Skip corrupted lines. */
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warnx("%s: line %d corrupted", fname, lcnt);
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continue;
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}
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p[len - 1] = '\0'; /* Terminate the line. */
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/* Skip leading space. */
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for (/*EMPTY*/; *p != '\0' && isspace((unsigned char)*p); ++p)
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continue;
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/* Skip empty/comment lines. */
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if (*p == '\0' || *p == '#')
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continue;
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/* Find first token. */
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for (t = p; *t && !isspace((unsigned char)*t); ++t)
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continue;
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if (*t == '\0') /* Need more than one token.*/
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continue;
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*t = '\0';
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tp = gettag(p, 1);
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if (!tp)
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errx(EXIT_FAILURE, "gettag: malloc failed");
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/*
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* Attach new records. Check to see if it is a
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* section record or not.
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*/
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if (*p == '_') { /* not a section record */
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/*
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* Special cases: _build and _crunch take the
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* rest of the line as a single entry.
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*/
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if (!strcmp(p, "_build") || !strcmp(p, "_crunch")) {
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/*
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* The reason we're not just using
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* strtok(3) for all of the parsing is
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* so we don't get caught if a line
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* has only a single token on it.
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*/
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while (*++t && isspace((unsigned char)*t));
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if (addentry(tp, t, 0) == -1)
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errx(EXIT_FAILURE,
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"addentry: malloc failed");
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} else {
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for (++t; (p = strtok(t, " \t\n")) != NULL;
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t = NULL) {
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if (addentry(tp, p, 0) == -1)
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errx(EXIT_FAILURE,
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"addentry: malloc failed");
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}
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}
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} else { /* section record */
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/*
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* section entries can either be all absolute
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* paths or all relative paths, but not both.
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*/
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type = (TAILQ_FIRST(&tp->entrylist) != NULL) ?
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*(TAILQ_FIRST(&tp->entrylist)->s) : 0;
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for (++t; (p = strtok(t, " \t\n")) != NULL; t = NULL) {
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/* ensure an assigned type */
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if (type == 0)
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type = *p;
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/* check for illegal mix */
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if (*p != type) {
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warnx("section %s: %s: invalid entry, does not match previous types",
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tp->s, p);
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warnx("man.conf cannot mix absolute and relative paths in an entry");
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continue;
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}
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if (addentry(tp, p, 0) == -1)
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errx(EXIT_FAILURE,
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"addentry: malloc failed");
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}
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}
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}
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(void)fclose(cfp);
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}
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/*
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* gettag --
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* if (!create) return tag for given name if it exists, or NULL otherwise
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*
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* if (create) return tag for given name if it exists, try and create
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* a new tag if it does not exist. return NULL if unable to create new
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* tag.
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*/
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TAG *
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gettag(const char *name, int create)
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{
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TAG *tp;
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TAILQ_FOREACH(tp, &head, q)
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if (!strcmp(name, tp->s))
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return tp;
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if (!create)
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return NULL;
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/* try and add it in */
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tp = malloc(sizeof(*tp));
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if (tp)
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tp->s = xstrdup(name, &tp->len);
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if (!tp || !tp->s) {
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if (tp)
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free(tp);
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return NULL;
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}
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TAILQ_INIT(&tp->entrylist);
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TAILQ_INSERT_TAIL(&head, tp, q);
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return tp;
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}
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/*
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* addentry --
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* add an entry to a list.
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* returns -1 if malloc failed, otherwise 0.
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*/
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int
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addentry(TAG *tp, const char *newent, int ishead)
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{
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ENTRY *ep;
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ep = malloc(sizeof(*ep));
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if (ep)
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ep->s = xstrdup(newent, &ep->len);
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if (!ep || !ep->s) {
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if (ep)
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free(ep);
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return -1;
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}
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if (ishead)
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TAILQ_INSERT_HEAD(&tp->entrylist, ep, q);
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else
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TAILQ_INSERT_TAIL(&tp->entrylist, ep, q);
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return 0;
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}
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