/*	$NetBSD: path.c,v 1.7 2004/12/29 11:35:03 agc Exp $	*/

/*-
 * Copyright (c)2002 YAMAMOTO Takashi,
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: path.c,v 1.7 2004/12/29 11:35:03 agc Exp $");
#endif

#include <err.h>

#include "lib.h"

struct pathhead PkgPath = TAILQ_HEAD_INITIALIZER(PkgPath);
static struct path *prepend = 0;

static struct path *path_new_entry(const char *cp, size_t len);

/*
 * path_create: make PkgPath from a given string.
 *
 * => relative pathes are resolved to absolute ones.
 * => if NULL is passed, use "." instead. XXX
 */
void
path_create(const char *path)
{
	const char *cp;
	size_t len;

	path_free();

	if (path == NULL) {
		path = "."; /* XXX */
	}

	if (Verbose)
		printf("parsing: %s\n", path);

	cp = path;
	while (*cp) {
		len = strcspn(cp, ";");
		if (len > 0) {
			/* add a new path */
			struct path *new;

			new = path_new_entry(cp, len);
			if (Verbose)
				printf("path: %s\n", new->pl_path);
			TAILQ_INSERT_TAIL(&PkgPath, new, pl_entry);
		}

		cp += len;
		if (*cp == '\0')
			break;
		cp++;
	}
}

/*
 * path_free: free PkgPath.
 */
void
path_free()
{
	struct path *p;

	while ((p = TAILQ_FIRST(&PkgPath)) != NULL) {
		TAILQ_REMOVE(&PkgPath, p, pl_entry);
		free(p->pl_path);
		free(p);
	}
}

/*
 * path_new_entry: Generate a new 'struct path' entry to be included in
 * 'PkgPath' using the first 'len' characters of 'cp'.
 */
static struct path *
path_new_entry(const char *cp, size_t len)
{
	struct path *new;

	new = malloc(sizeof(*new));
	if (new == NULL)
		err(EXIT_FAILURE, "path_create");

	if (!IS_FULLPATH(cp) && !IS_URL(cp)) {
		/* this is a relative path */
		size_t total;
		char cwd[MaxPathSize];
		size_t cwdlen;

		if (getcwd(cwd, sizeof(cwd)) == NULL)
			err(EXIT_FAILURE, "getcwd");
		cwdlen = strlen(cwd);
		total = cwdlen + 1 + len + 1;
		new->pl_path = malloc(total);
		if (new->pl_path == NULL)
			err(EXIT_FAILURE, "path_create");
		snprintf(new->pl_path, total, "%s/%*.*s", cwd, (int)len, (int)len, cp);
	}
	else {
		new->pl_path = malloc(len + 1);
		if (new->pl_path == NULL)
			err(EXIT_FAILURE, "path_create");
		memcpy(new->pl_path, cp, len);
		new->pl_path[len] = '\0';
	}
	return new;
}

/*
 * path_prepend_from_pkgname: prepend the path for a package onto 'PkgPath'
 */
void
path_prepend_from_pkgname(const char *pkgname)
{
	char *ptr;
	if ((ptr = strrchr(pkgname , '/'))) {
		prepend = path_new_entry(pkgname, ptr - pkgname);
		TAILQ_INSERT_HEAD(&PkgPath, prepend, pl_entry);
	}
}

/*
 * path_prepend_clear: Remove any prepended entry from 'PkgPath'
 */
void
path_prepend_clear()
{
	if (prepend) {
		TAILQ_REMOVE(&PkgPath, prepend, pl_entry);
		prepend = 0;
	}
}

/*
 * path_setenv: construct string from PkgPath and set it to a environment.
 *
 * => the environment name is given by envname.
 */
void
path_setenv(const char *envname)
{
	struct path *p;
	ssize_t len = 0;
	char *env, *env0, *envend;
	char *sep;

	TAILQ_FOREACH(p, &PkgPath, pl_entry)
		len += strlen(p->pl_path) + 1;

	env = malloc(len);
	if (env == NULL)
		err(EXIT_FAILURE, "path_setenv");

	env0 = env;
	envend = env + len;
	sep = "";
	TAILQ_FOREACH(p, &PkgPath, pl_entry) {
		int r;

		r = snprintf(env, envend - env, "%s%s", sep, p->pl_path);
		if (r < 0 || r >= envend - env)
			err(EXIT_FAILURE, "snprintf");
		env += r;
		sep = ";";
	}

	if (Verbose)
		printf("%s = %s\n", envname, env0);
	if (setenv(envname, env0, 1) != 0)
		err(EXIT_FAILURE, "setenv");
	free(env0);
}