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/* $Id: manpath.c,v 1.19 2014/11/27 00:30:40 schwarze Exp $ */
/*
* Copyright (c) 2011, 2014 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 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 "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mandoc_aux.h"
#include "manpath.h"
#define MAN_CONF_FILE "/etc/man.conf"
#define MAN_CONF_KEY "_whatdb"
static void manpath_add(struct manpaths *, const char *, int);
static void manpath_parseline(struct manpaths *, char *, int);
void
manpath_parse(struct manpaths *dirs, const char *file,
char *defp, char *auxp)
{
#if HAVE_MANPATH
char cmd[(PATH_MAX * 3) + 20];
FILE *stream;
char *buf;
size_t sz, bsz;
strlcpy(cmd, "manpath", sizeof(cmd));
if (file) {
strlcat(cmd, " -C ", sizeof(cmd));
strlcat(cmd, file, sizeof(cmd));
}
if (auxp) {
strlcat(cmd, " -m ", sizeof(cmd));
strlcat(cmd, auxp, sizeof(cmd));
}
if (defp) {
strlcat(cmd, " -M ", sizeof(cmd));
strlcat(cmd, defp, sizeof(cmd));
}
/* Open manpath(1). Ignore errors. */
stream = popen(cmd, "r");
if (NULL == stream)
return;
buf = NULL;
bsz = 0;
/* Read in as much output as we can. */
do {
buf = mandoc_realloc(buf, bsz + 1024);
sz = fread(buf + bsz, 1, 1024, stream);
bsz += sz;
} while (sz > 0);
if ( ! ferror(stream) && feof(stream) &&
bsz && '\n' == buf[bsz - 1]) {
buf[bsz - 1] = '\0';
manpath_parseline(dirs, buf, 1);
}
free(buf);
pclose(stream);
#else
char *insert;
/* Always prepend -m. */
manpath_parseline(dirs, auxp, 1);
/* If -M is given, it overrides everything else. */
if (NULL != defp) {
manpath_parseline(dirs, 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]) {
manpath_manconf(dirs, file);
return;
}
/* Prepend man.conf(5) to MANPATH. */
if (':' == defp[0]) {
manpath_manconf(dirs, file);
manpath_parseline(dirs, defp, 0);
return;
}
/* Append man.conf(5) to MANPATH. */
if (':' == defp[strlen(defp) - 1]) {
manpath_parseline(dirs, defp, 0);
manpath_manconf(dirs, file);
return;
}
/* Insert man.conf(5) into MANPATH. */
insert = strstr(defp, "::");
if (NULL != insert) {
*insert++ = '\0';
manpath_parseline(dirs, defp, 0);
manpath_manconf(dirs, file);
manpath_parseline(dirs, insert + 1, 0);
return;
}
/* MANPATH overrides man.conf(5) completely. */
manpath_parseline(dirs, defp, 0);
#endif
}
/*
* 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) {
fputs("manpath: ", stderr);
perror(dir);
}
return;
}
for (i = 0; i < dirs->sz; i++)
if (0 == strcmp(dirs->paths[i], dir))
return;
if (stat(cp, &sb) == -1) {
if (complain) {
fputs("manpath: ", stderr);
perror(dir);
}
return;
}
dirs->paths = mandoc_reallocarray(dirs->paths,
dirs->sz + 1, sizeof(char *));
dirs->paths[dirs->sz++] = mandoc_strdup(cp);
}
void
manpath_free(struct manpaths *p)
{
size_t i;
for (i = 0; i < p->sz; i++)
free(p->paths[i]);
free(p->paths);
}
void
manpath_manconf(struct manpaths *dirs, const char *file)
{
FILE *stream;
char *p, *q;
size_t len, keysz;
keysz = strlen(MAN_CONF_KEY);
assert(keysz > 0);
if (NULL == (stream = fopen(file, "r")))
return;
while (NULL != (p = fgetln(stream, &len))) {
if (0 == len || '\n' != p[--len])
break;
p[len] = '\0';
while (isspace((unsigned char)*p))
p++;
if (strncmp(MAN_CONF_KEY, p, keysz))
continue;
p += keysz;
while (isspace((unsigned char)*p))
p++;
if ('\0' == *p)
continue;
if (NULL == (q = strrchr(p, '/')))
continue;
*q = '\0';
manpath_add(dirs, p, 0);
}
fclose(stream);
}
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