NetBSD-5.0.2/usr.bin/man/manconf.c
/* $NetBSD: manconf.c,v 1.6 2008/03/08 15:48:27 christos Exp $ */
/*
* 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. 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.
*/
/*
* manconf.c: provides interface for reading man.conf files
*
* note that this code is shared across all programs that read man.conf.
* (currently: apropos, catman, makewhatis, man, and whatis...)
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)config.c 8.8 (Berkeley) 1/31/95";
#else
__RCSID("$NetBSD: manconf.c,v 1.6 2008/03/08 15:48:27 christos Exp $");
#endif
#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 "manconf.h"
#include "pathnames.h"
TAILQ_HEAD(_head, _tag);
static struct _head head; /* 'head' -- top level data structure */
/*
* xstrdup: like strdup, but also returns length of string in lenp
*/
static char *
xstrdup(const char *str, size_t *lenp)
{
size_t len;
char *copy;
len = strlen(str) + 1;
copy = malloc(len);
if (!copy)
return NULL;
(void)memcpy(copy, str, len);
if (lenp)
*lenp = len - 1; /* subtract out the null */
return copy;
}
/*
* config --
*
* Read the configuration file and build a doubly linked
* list off of "head" that looks like:
*
* tag1 <-> entry <-> entry <-> entry
* |
* tag2 <-> entry <-> entry <-> entry
*
* note: will err/errx out on error (fopen or malloc failure)
*/
void
config(const char *fname)
{
TAG *tp;
FILE *cfp;
size_t len;
int lcnt;
char *p, *t, type;
if (fname == NULL)
fname = _PATH_MANCONF;
if ((cfp = fopen(fname, "r")) == NULL)
err(EXIT_FAILURE, "%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 (/*EMPTY*/; *p != '\0' && isspace((unsigned char)*p); ++p)
continue;
/* Skip empty/comment lines. */
if (*p == '\0' || *p == '#')
continue;
/* Find first token. */
for (t = p; *t && !isspace((unsigned char)*t); ++t)
continue;
if (*t == '\0') /* Need more than one token.*/
continue;
*t = '\0';
tp = gettag(p, 1);
if (!tp)
errx(EXIT_FAILURE, "gettag: malloc failed");
/*
* Attach new records. Check to see if it is a
* section record or not.
*/
if (*p == '_') { /* not a section record */
/*
* Special cases: _build and _crunch take the
* rest of the line as a single entry.
*/
if (!strcmp(p, "_build") || !strcmp(p, "_crunch")) {
/*
* 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.
*/
while (*++t && isspace((unsigned char)*t));
if (addentry(tp, t, 0) == -1)
errx(EXIT_FAILURE,
"addentry: malloc failed");
} else {
for (++t; (p = strtok(t, " \t\n")) != NULL;
t = NULL) {
if (addentry(tp, p, 0) == -1)
errx(EXIT_FAILURE,
"addentry: malloc failed");
}
}
} else { /* section record */
/*
* section entries can either be all absolute
* paths or all relative paths, but not both.
*/
type = (TAILQ_FIRST(&tp->entrylist) != NULL) ?
*(TAILQ_FIRST(&tp->entrylist)->s) : 0;
for (++t; (p = strtok(t, " \t\n")) != NULL; t = NULL) {
/* ensure an assigned type */
if (type == 0)
type = *p;
/* check for illegal mix */
if (*p != type) {
warnx("section %s: %s: invalid entry, does not match previous types",
tp->s, p);
warnx("man.conf cannot mix absolute and relative paths in an entry");
continue;
}
if (addentry(tp, p, 0) == -1)
errx(EXIT_FAILURE,
"addentry: malloc failed");
}
}
}
(void)fclose(cfp);
}
/*
* gettag --
* if (!create) return tag for given name if it exists, or NULL otherwise
*
* if (create) return tag for given name if it exists, try and create
* a new tag if it does not exist. return NULL if unable to create new
* tag.
*/
TAG *
gettag(const char *name, int create)
{
TAG *tp;
TAILQ_FOREACH(tp, &head, q)
if (!strcmp(name, tp->s))
return tp;
if (!create)
return NULL;
/* try and add it in */
tp = malloc(sizeof(*tp));
if (tp)
tp->s = xstrdup(name, &tp->len);
if (!tp || !tp->s) {
if (tp)
free(tp);
return NULL;
}
TAILQ_INIT(&tp->entrylist);
TAILQ_INSERT_TAIL(&head, tp, q);
return tp;
}
/*
* addentry --
* add an entry to a list.
* returns -1 if malloc failed, otherwise 0.
*/
int
addentry(TAG *tp, const char *newent, int ishead)
{
ENTRY *ep;
ep = malloc(sizeof(*ep));
if (ep)
ep->s = xstrdup(newent, &ep->len);
if (!ep || !ep->s) {
if (ep)
free(ep);
return -1;
}
if (ishead)
TAILQ_INSERT_HEAD(&tp->entrylist, ep, q);
else
TAILQ_INSERT_TAIL(&tp->entrylist, ep, q);
return 0;
}