mdocml: Support for Open/NetBSD's /etc/man.conf and others' manpath(1).

mdocml: Support for Open/NetBSD's /etc/man.conf and others' manpath(1).

[kristaps]

Log Message:
-----------
Support for Open/NetBSD's /etc/man.conf and others' manpath(1).
Most of this code (except the manpath part) written by schwarze@.
This isn't hooked into anything yet.

Added Files:
-----------
    mdocml:
        manpath.c
        manpath.h

Revision Data
-------------
--- /dev/null
+++ manpath.h
@@ -0,0 +1,39 @@
+/*	$Id: manpath.h,v 1.1 2011/11/23 09:47:38 kristaps Exp $ */
+/*
+ * Copyright (c) 2011 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.
+ */
+#ifndef MANPATH_H
+#define MANPATH_H
+
+/*
+ * Unsorted list of unique, absolute paths to be searched for manual
+ * databases.
+ */
+struct	manpaths {
+	int	  sz;
+	char	**paths;
+};
+
+__BEGIN_DECLS
+
+void	 manpath_parse(struct manpaths *, char *, char *);
+void	 manpath_parseconf(struct manpaths *);
+void	 manpath_parseline(struct manpaths *, char *);
+void	 manpath_free(struct manpaths *);
+
+__END_DECLS
+
+#endif /*!MANPATH_H*/
--- /dev/null
+++ manpath.c
@@ -0,0 +1,167 @@
+/*	$Id: manpath.c,v 1.1 2011/11/23 09:47:38 kristaps Exp $ */
+/*
+ * Copyright (c) 2011 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.
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <assert.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mandoc.h"
+#include "manpath.h"
+
+#define MAN_CONF_FILE	"/etc/man.conf"
+#define MAN_CONF_KEY	"_whatdb"
+
+static	void	 manpath_add(struct manpaths *, const char *);
+
+void
+manpath_parse(struct manpaths *dirs, char *defp, char *auxp) 
+{
+
+	if (NULL != getenv("MANPATH"))
+		defp = getenv("MANPATH");
+
+	if (NULL == defp)
+		manpath_parseconf(dirs);
+	else
+		manpath_parseline(dirs, defp);
+
+	manpath_parseline(dirs, auxp);
+}
+
+/*
+ * Parse a FULL pathname from a colon-separated list of arrays.
+ */
+void
+manpath_parseline(struct manpaths *dirs, char *path) 
+{
+	char	*dir;
+
+	if (NULL == path)
+		return;
+
+	for (dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
+		manpath_add(dirs, dir);
+}
+
+/*
+ * 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) 
+{
+	char		 buf[PATH_MAX];
+	char		*cp;
+	int		 i;
+
+	if (NULL == (cp = realpath(dir, buf)))
+		return;
+
+	for (i = 0; i < dirs->sz; i++)
+		if (0 == strcmp(dirs->paths[i], dir))
+			return;
+
+	dirs->paths = mandoc_realloc
+		(dirs->paths, 
+		 ((size_t)dirs->sz + 1) * sizeof(char *));
+
+	dirs->paths[dirs->sz++] = mandoc_strdup(cp);
+}
+
+void
+manpath_parseconf(struct manpaths *dirs)
+{
+	FILE		*stream;
+#ifdef	USE_MANPATH
+	char		*buf;
+	size_t		 sz, bsz;
+
+	/* Open manpath(1).  Ignore errors. */
+
+	stream = popen("manpath", "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 + (int)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);
+	}
+
+	free(buf);
+	pclose(stream);
+#else
+	char		*p, *q;
+	size_t	 	 len, keysz;
+
+	keysz = strlen(MAN_CONF_KEY);
+	assert(keysz > 0);
+
+	if (NULL == (stream = fopen(MAN_CONF_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(*p))
+			p++;
+		if ('\0' == *p)
+			continue;
+		if (NULL == (q = strrchr(p, '/')))
+			continue;
+		*q = '\0';
+		manpath_add(dirs, p);
+	}
+
+	fclose(stream);
+#endif
+}
+
+void
+manpath_free(struct manpaths *p)
+{
+	int		 i;
+
+	for (i = 0; i < p->sz; i++)
+		free(p->paths[i]);
+
+	free(p->paths);
+}
--
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