7 files changed, 436 insertions, 83 deletions

diff --git a/src/util/.gitignore b/src/util/.gitignore
index 9c855dff..2880ce2a 100644
--- a/src/util/.gitignore
+++ b/src/util/.gitignore
@@ -1,11 +1,12 @@
 .deps
 .libs
-vercmp
-vercmp.exe
-testpkg
-testpkg.exe
-testdb
-testdb.exe
 cleanupdelta
 cleanupdelta.exe
-
+pactree
+pactree.exe
+testdb
+testdb.exe
+testpkg
+testpkg.exe
+vercmp
+vercmp.exe
diff --git a/src/util/Makefile.am b/src/util/Makefile.am
index 7dce9dcc..30a2ee35 100644
--- a/src/util/Makefile.am
+++ b/src/util/Makefile.am
@@ -3,7 +3,7 @@ conffile  = ${sysconfdir}/pacman.conf
 dbpath    = ${localstatedir}/lib/pacman/
 cachedir  = ${localstatedir}/cache/pacman/pkg/
 
-bin_PROGRAMS = vercmp testpkg testdb cleanupdelta
+bin_PROGRAMS = vercmp testpkg testdb cleanupdelta pactree
 
 DEFS = -DLOCALEDIR=\"@localedir@\" \
        -DCONFFILE=\"$(conffile)\" \
@@ -27,5 +27,8 @@ testdb_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la
 cleanupdelta_SOURCES = cleanupdelta.c
 cleanupdelta_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la
 
+pactree_SOURCES = pactree.c
+pactree_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la
+
 
 # vim:set ts=2 sw=2 noet:
diff --git a/src/util/cleanupdelta.c b/src/util/cleanupdelta.c
index ffcfaba5..4403e9fa 100644
--- a/src/util/cleanupdelta.c
+++ b/src/util/cleanupdelta.c
@@ -1,7 +1,7 @@
 /*
  *  cleanupdelta.c : return list of unused delta in a given sync database
  *
- *  Copyright (c) 2010 Pacman Development Team <pacman-dev@archlinux.org>
+ *  Copyright (c) 2011 Pacman Development Team <pacman-dev@archlinux.org>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -17,6 +17,8 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "config.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -35,7 +37,7 @@ static void cleanup(int signum) {
 	exit(signum);
 }
 
-void output_cb(pmloglevel_t level, char *fmt, va_list args)
+static void output_cb(pmloglevel_t level, char *fmt, va_list args)
 {
 	if(strlen(fmt)) {
 		switch(level) {
@@ -49,7 +51,7 @@ void output_cb(pmloglevel_t level, char *fmt, va_list args)
 }
 
 
-void checkpkgs(alpm_list_t *pkglist)
+static void checkpkgs(alpm_list_t *pkglist)
 {
 	alpm_list_t *i, *j;
 	for(i = pkglist; i; i = alpm_list_next(i)) {
@@ -63,7 +65,7 @@ void checkpkgs(alpm_list_t *pkglist)
 	}
 }
 
-void checkdbs(char *dbpath, alpm_list_t *dbnames) {
+static void checkdbs(char *dbpath, alpm_list_t *dbnames) {
 	char syncdbpath[PATH_MAX];
 	pmdb_t *db = NULL;
 	alpm_list_t *i;
@@ -82,14 +84,14 @@ void checkdbs(char *dbpath, alpm_list_t *dbnames) {
 
 }
 
-void usage() {
+static void usage(void) {
 	fprintf(stderr, "usage:\n");
 	fprintf(stderr,
 			"\t%s [-b <pacman db>] core extra ... : check the listed sync databases\n", BASENAME);
 	exit(1);
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	char *dbpath = DBPATH;
 	int a = 1;
diff --git a/src/util/pactree.c b/src/util/pactree.c
new file mode 100644
index 00000000..6a10006f
--- /dev/null
+++ b/src/util/pactree.c
@@ -0,0 +1,372 @@
+/*
+ *  pactree.c - a simple dependency tree viewer
+ *
+ *  Copyright (c) 2010-2011 Pacman Development Team <pacman-dev@archlinux.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <getopt.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <alpm.h>
+#include <alpm_list.h>
+
+/* output */
+char *provides     = " provides";
+char *unresolvable = " [unresolvable]";
+char *branch_tip1  = "|--";
+char *branch_tip2  = "+--";
+int   indent_size  = 3;
+
+/* color */
+char *branch1_color = "\033[0;33m"; /* yellow */
+char *branch2_color = "\033[0;37m"; /* white */
+char *leaf1_color   = "\033[1;32m"; /* bold green */
+char *leaf2_color   = "\033[0;32m"; /* green */
+char *color_off     = "\033[0m";
+
+/* globals */
+pmdb_t *db_local;
+alpm_list_t *walked = NULL;
+alpm_list_t *provisions = NULL;
+
+/* options */
+int color = 0;
+int graphviz = 0;
+int linear = 0;
+int max_depth = -1;
+int reverse = 0;
+int unique = 0;
+char *dbpath = NULL;
+
+static int alpm_local_init(void)
+{
+	int ret;
+
+	ret = alpm_initialize();
+	if(ret != 0) {
+		return(ret);
+	}
+
+	ret = alpm_option_set_root(ROOTDIR);
+	if(ret != 0) {
+		return(ret);
+	}
+
+	if(dbpath) {
+		ret = alpm_option_set_dbpath(dbpath);
+	} else {
+		ret = alpm_option_set_dbpath(DBPATH);
+	}
+	if(ret != 0) {
+		return(ret);
+	}
+
+	db_local = alpm_option_get_localdb();
+	if(!db_local) {
+		return(1);
+	}
+
+	return(0);
+}
+
+static int parse_options(int argc, char *argv[])
+{
+	int opt, option_index = 0;
+	char *endptr = NULL;
+
+	static struct option opts[] = {
+		{"dbpath",  required_argument,    0, 'b'},
+		{"color",   no_argument,          0, 'c'},
+		{"depth",   required_argument,    0, 'd'},
+		{"graph",   no_argument,          0, 'g'},
+		{"help",    no_argument,          0, 'h'},
+		{"linear",  no_argument,          0, 'l'},
+		{"reverse", no_argument,          0, 'r'},
+		{"unique",  no_argument,          0, 'u'},
+		{0, 0, 0, 0}
+	};
+
+	while((opt = getopt_long(argc, argv, "b:cd:ghlru", opts, &option_index))) {
+		if(opt < 0) {
+			break;
+		}
+
+		switch(opt) {
+			case 'b':
+				dbpath = strdup(optarg);
+				break;
+			case 'c':
+				color = 1;
+				break;
+			case 'd':
+				/* validate depth */
+				max_depth = (int)strtol(optarg, &endptr, 10);
+				if(*endptr != '\0') {
+					fprintf(stderr, "error: invalid depth -- %s\n", optarg);
+					return 1;
+				}
+				break;
+			case 'g':
+				graphviz = 1;
+				break;
+			case 'l':
+				linear = 1;
+				break;
+			case 'r':
+				reverse = 1;
+				break;
+			case 'u':
+				unique = linear = 1;
+				break;
+			case 'h':
+			case '?':
+			default:
+				return(1);
+		}
+	}
+
+	if(!argv[optind]) {
+		return(1);
+	}
+
+	if(!color) {
+		branch1_color = "";
+		branch2_color = "";
+		leaf1_color   = "";
+		leaf2_color   = "";
+		color_off     = "";
+	}
+	if(linear) {
+		provides     = "";
+		branch_tip1  = "";
+		branch_tip2  = "";
+		indent_size  = 0;
+	}
+
+	return(0);
+}
+
+static void usage(void)
+{
+	fprintf(stderr, "pactree v" PACKAGE_VERSION "\n"
+			"Usage: pactree [options] PACKAGE\n\n"
+			"  -b, --dbpath <path>  set an alternate database location\n"
+			"  -c, --color          colorize output\n"
+			"  -d, --depth <#>      limit the depth of recursion\n"
+			"  -g, --graph          generate output for graphviz's dot\n"
+			"  -l, --linear         enable linear output\n"
+			"  -r, --reverse        show reverse dependencies\n"
+			"  -u, --unique         show dependencies with no duplicates (implies -l)\n\n"
+			"  -h, --help           display this help message\n");
+}
+
+static void cleanup(void)
+{
+	if(dbpath) {
+		free(dbpath);
+	}
+
+	alpm_list_free(walked);
+	alpm_list_free(provisions);
+	alpm_release();
+}
+
+/* pkg provides provision */
+static void print_text(const char *pkg, const char *provision, int depth)
+{
+	int indent_sz = (depth + 1) * indent_size;
+
+	if(!pkg && !provision) {
+		/* not much we can do */
+		return;
+	}
+
+	if(!pkg && provision) {
+		/* we failed to resolve provision */
+		printf("%s%*s%s%s%s%s%s\n", branch1_color, indent_sz, branch_tip1,
+				leaf1_color, provision, branch1_color, unresolvable, color_off);
+	} else if(provision && strcmp(pkg, provision) != 0) {
+		/* pkg provides provision */
+		printf("%s%*s%s%s%s%s %s%s%s\n", branch2_color, indent_sz, branch_tip2,
+				leaf1_color, pkg, leaf2_color, provides, leaf1_color, provision,
+				color_off);
+	} else {
+		/* pkg is a normal package */
+		printf("%s%*s%s%s%s\n", branch1_color, indent_sz, branch_tip1, leaf1_color,
+				pkg, color_off);
+	}
+}
+
+static void print_graph(const char *parentname, const char *pkgname, const char *depname)
+{
+	if(depname) {
+		printf("\"%s\" -> \"%s\" [color=chocolate4];\n", parentname, depname);
+		if(pkgname && strcmp(depname, pkgname) != 0 && !alpm_list_find_str(provisions, depname)) {
+			printf("\"%s\" -> \"%s\" [arrowhead=none, color=grey];\n", depname, pkgname);
+			provisions = alpm_list_add(provisions, (char *)depname);
+		}
+	} else if(pkgname) {
+		printf("\"%s\" -> \"%s\" [color=chocolate4];\n", parentname, pkgname);
+	}
+}
+
+/* parent depends on dep which is satisfied by pkg */
+static void print(const char *parentname, const char *pkgname, const char *depname, int depth)
+{
+	if(graphviz) {
+		print_graph(parentname, pkgname, depname);
+	} else {
+		print_text(pkgname, depname, depth);
+	}
+}
+
+static void print_start(const char *pkgname, const char *provname)
+{
+	if(graphviz) {
+		printf("digraph G { START [color=red, style=filled];\n"
+				"node [style=filled, color=green];\n"
+				" \"START\" -> \"%s\";\n", pkgname);
+	} else {
+		print_text(pkgname, provname, 0);
+	}
+}
+
+static void print_end(void)
+{
+	if(graphviz) {
+		/* close graph output */
+		printf("}\n");
+	}
+}
+
+
+/**
+ * walk dependencies in reverse, showing packages which require the target
+ */
+static void walk_reverse_deps(pmpkg_t *pkg, int depth)
+{
+	alpm_list_t *required_by, *i;
+
+	if((max_depth >= 0) && (depth == max_depth + 1)) {
+		return;
+	}
+
+	walked = alpm_list_add(walked, (void*)alpm_pkg_get_name(pkg));
+	required_by = alpm_pkg_compute_requiredby(pkg);
+
+	for(i = required_by; i; i = alpm_list_next(i)) {
+		const char *pkgname = alpm_list_getdata(i);
+
+		if(alpm_list_find_str(walked, pkgname)) {
+			/* if we've already seen this package, don't print in "unique" output
+			 * and don't recurse */
+			if(!unique) {
+				print(alpm_pkg_get_name(pkg), pkgname, NULL, depth);
+			}
+		} else {
+			print(alpm_pkg_get_name(pkg), pkgname, NULL, depth);
+			walk_reverse_deps(alpm_db_get_pkg(db_local, pkgname), depth + 1);
+		}
+	}
+
+	FREELIST(required_by);
+}
+
+/**
+ * walk dependencies, showing dependencies of the target
+ */
+static void walk_deps(pmpkg_t *pkg, int depth)
+{
+	alpm_list_t *i;
+
+	if((max_depth >= 0) && (depth == max_depth + 1)) {
+		return;
+	}
+
+	walked = alpm_list_add(walked, (void*)alpm_pkg_get_name(pkg));
+
+	for(i = alpm_pkg_get_depends(pkg); i; i = alpm_list_next(i)) {
+		pmdepend_t *depend = alpm_list_getdata(i);
+		pmpkg_t *provider = alpm_find_satisfier(alpm_db_get_pkgcache(db_local),
+				alpm_dep_get_name(depend));
+
+		if(provider) {
+			const char *provname = alpm_pkg_get_name(provider);
+
+			if(alpm_list_find_str(walked, provname)) {
+				/* if we've already seen this package, don't print in "unique" output
+				 * and don't recurse */
+				if(!unique) {
+					print(alpm_pkg_get_name(pkg), provname, alpm_dep_get_name(depend), depth);
+				}
+			} else {
+				print(alpm_pkg_get_name(pkg), provname, alpm_dep_get_name(depend), depth);
+				walk_deps(provider, depth + 1);
+			}
+		} else {
+			/* unresolvable package */
+			print(alpm_pkg_get_name(pkg), NULL, alpm_dep_get_name(depend), depth);
+		}
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+	const char *target_name;
+	pmpkg_t *pkg;
+
+	ret = parse_options(argc, argv);
+	if(ret != 0) {
+		usage();
+		goto finish;
+	}
+
+	ret = alpm_local_init();
+	if(ret != 0) {
+		fprintf(stderr, "error: cannot initialize alpm: %s\n", alpm_strerrorlast());
+		goto finish;
+	}
+
+	/* we only care about the first non option arg for walking */
+	target_name = argv[optind];
+
+	pkg = alpm_find_satisfier(alpm_db_get_pkgcache(db_local), target_name);
+	if(!pkg) {
+		fprintf(stderr, "error: package '%s' not found\n", target_name);
+		ret = 1;
+		goto finish;
+	}
+
+	print_start(alpm_pkg_get_name(pkg), target_name);
+
+	if(reverse) {
+		walk_reverse_deps(pkg, 1);
+	} else {
+		walk_deps(pkg, 1);
+	}
+
+	print_end();
+
+finish:
+	cleanup();
+	return(ret);
+}
+
+/* vim: set ts=2 sw=2 noet: */
diff --git a/src/util/testdb.c b/src/util/testdb.c
index 6d351ebd..461cf23a 100644
--- a/src/util/testdb.c
+++ b/src/util/testdb.c
@@ -17,11 +17,12 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "config.h"
+
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
-#include <limits.h>
 #include <string.h>
 #include <dirent.h>
 
@@ -30,11 +31,6 @@
 
 #define BASENAME "testdb"
 
-int str_cmp(const void *s1, const void *s2)
-{
-	return(strcmp(s1, s2));
-}
-
 static void cleanup(int signum) {
 	if(alpm_release() == -1) {
 		fprintf(stderr, "error releasing alpm: %s\n", alpm_strerrorlast());
@@ -43,7 +39,7 @@ static void cleanup(int signum) {
 	exit(signum);
 }
 
-void output_cb(pmloglevel_t level, char *fmt, va_list args)
+static void output_cb(pmloglevel_t level, char *fmt, va_list args)
 {
 	if(strlen(fmt)) {
 		switch(level) {
@@ -55,42 +51,37 @@ void output_cb(pmloglevel_t level, char *fmt, va_list args)
 	}
 }
 
-static int db_test(char *dbpath, int local)
+static int check_localdb_files(void)
 {
 	struct dirent *ent;
-	char path[PATH_MAX];
+	const char *dbpath;
+	char path[4096];
 	int ret = 0;
-
 	DIR *dir;
 
-	if(!(dir = opendir(dbpath))) {
-		fprintf(stderr, "error : %s : %s\n", dbpath, strerror(errno));
+	dbpath = alpm_option_get_dbpath();
+	snprintf(path, sizeof(path), "%slocal", dbpath);
+	if(!(dir = opendir(path))) {
+		fprintf(stderr, "error : %s : %s\n", path, strerror(errno));
 		return(1);
 	}
 
 	while ((ent = readdir(dir)) != NULL) {
-		if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..")
+		if(strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0
 				|| ent->d_name[0] == '.') {
 			continue;
 		}
-		/* check for desc, depends, and files */
-		snprintf(path, PATH_MAX, "%s/%s/desc", dbpath, ent->d_name);
+		/* check for known db files in local database */
+		snprintf(path, sizeof(path), "%slocal/%s/desc", dbpath, ent->d_name);
 		if(access(path, F_OK)) {
 			printf("%s: description file is missing\n", ent->d_name);
 			ret++;
 		}
-		snprintf(path, PATH_MAX, "%s/%s/depends", dbpath, ent->d_name);
+		snprintf(path, sizeof(path), "%slocal/%s/files", dbpath, ent->d_name);
 		if(access(path, F_OK)) {
-			printf("%s: dependency file is missing\n", ent->d_name);
+			printf("%s: file list is missing\n", ent->d_name);
 			ret++;
 		}
-		if(local) {
-			snprintf(path, PATH_MAX, "%s/%s/files", dbpath, ent->d_name);
-			if(access(path, F_OK)) {
-				printf("%s: file list is missing\n", ent->d_name);
-				ret++;
-			}
-		}
 	}
 	if(closedir(dir)) {
 		fprintf(stderr, "error closing dbpath : %s\n", strerror(errno));
@@ -100,7 +91,7 @@ static int db_test(char *dbpath, int local)
 	return(ret);
 }
 
-int checkdeps(alpm_list_t *pkglist)
+static int checkdeps(alpm_list_t *pkglist)
 {
 	alpm_list_t *data, *i;
 	int ret = 0;
@@ -119,7 +110,7 @@ int checkdeps(alpm_list_t *pkglist)
 	return(ret);
 }
 
-int checkconflicts(alpm_list_t *pkglist)
+static int checkconflicts(alpm_list_t *pkglist)
 {
 	alpm_list_t *data, *i;
 	int ret = 0;
@@ -135,19 +126,17 @@ int checkconflicts(alpm_list_t *pkglist)
 	return(ret);
 }
 
-int check_localdb(char *dbpath) {
-	char localdbpath[PATH_MAX];
+static int check_localdb(void) {
 	int ret = 0;
 	pmdb_t *db = NULL;
 	alpm_list_t *pkglist;
 
-	snprintf(localdbpath, PATH_MAX, "%s/local", dbpath);
-	ret = db_test(localdbpath, 1);
+	ret = check_localdb_files();
 	if(ret) {
 		return(ret);
 	}
 
-	db = alpm_db_register_local();
+	db = alpm_option_get_localdb();
 	if(db == NULL) {
 		fprintf(stderr, "error: could not register 'local' database (%s)\n",
 				alpm_strerrorlast());
@@ -159,20 +148,13 @@ int check_localdb(char *dbpath) {
 	return(ret);
 }
 
-int check_syncdbs(char *dbpath, alpm_list_t *dbnames) {
-	char syncdbpath[PATH_MAX];
+static int check_syncdbs(alpm_list_t *dbnames) {
 	int ret = 0;
 	pmdb_t *db = NULL;
 	alpm_list_t *i, *pkglist, *syncpkglist = NULL;
 
 	for(i = dbnames; i; i = alpm_list_next(i)) {
 		char *dbname = alpm_list_getdata(i);
-		snprintf(syncdbpath, PATH_MAX, "%s/sync/%s", dbpath, dbname);
-		ret = db_test(syncdbpath, 0);
-		if(ret) {
-			ret = 1;
-			goto cleanup;
-		}
 		db = alpm_db_register_sync(dbname);
 		if(db == NULL) {
 			fprintf(stderr, "error: could not register sync database (%s)\n",
@@ -190,7 +172,7 @@ cleanup:
 	return(ret);
 }
 
-void usage() {
+static void usage(void) {
 	fprintf(stderr, "usage:\n");
 	fprintf(stderr,
 			"\t%s [-b <pacman db>]                : check the local database\n", BASENAME);
@@ -199,7 +181,7 @@ void usage() {
 	exit(1);
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	int ret = 0;
 	char *dbpath = DBPATH;
@@ -224,18 +206,21 @@ int main(int argc, char **argv)
 
 	if(alpm_initialize() == -1) {
 		fprintf(stderr, "cannot initialize alpm: %s\n", alpm_strerrorlast());
-		return(1);
+		return(EXIT_FAILURE);
 	}
 
 	/* let us get log messages from libalpm */
 	alpm_option_set_logcb(output_cb);
 
-	alpm_option_set_dbpath(dbpath);
+	if(alpm_option_set_dbpath(dbpath) != 0) {
+		fprintf(stderr, "cannot set dbpath: %s\n", alpm_strerrorlast());
+		return(EXIT_FAILURE);
+	}
 
 	if(!dbnames) {
-		ret = check_localdb(dbpath);
+		ret = check_localdb();
 	} else {
-		ret = check_syncdbs(dbpath,dbnames);
+		ret = check_syncdbs(dbnames);
 		alpm_list_free(dbnames);
 	}
 
diff --git a/src/util/testpkg.c b/src/util/testpkg.c
index d86fb1e0..0dd8db8f 100644
--- a/src/util/testpkg.c
+++ b/src/util/testpkg.c
@@ -17,8 +17,6 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "config.h"
-
 #include <stdio.h> /* printf */
 #include <stdarg.h> /* va_list */
 
@@ -39,7 +37,7 @@ static void output_cb(pmloglevel_t level, char *fmt, va_list args)
 	vprintf(fmt, args);
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	int retval = 1; /* default = false */
 	pmpkg_t *pkg = NULL;
diff --git a/src/util/vercmp.c b/src/util/vercmp.c
index 959dc137..adb5a42a 100644
--- a/src/util/vercmp.c
+++ b/src/util/vercmp.c
@@ -1,7 +1,7 @@
 /*
  *  vercmp.c
  *
- *  Copyright (c) 2006-2010 Pacman Development Team <pacman-dev@archlinux.org>
+ *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
  *  Copyright (c) 2002-2005 by Judd Vinet <jvinet@zeroflux.org>
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -18,23 +18,20 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "config.h"
-
+#include <stdlib.h>
 #include <stdio.h> /* printf */
 #include <string.h> /* strncpy */
 
 #define BASENAME "vercmp"
 
-#define MAX_LEN 255
-
-/* forward declaration, comes from vercmp.o in libalpm source that is linked in
- * directly so we don't have any library deps */
+/* forward declaration, comes from version.o in libalpm source that is linked
+ * in directly so we don't have any library deps */
 int alpm_pkg_vercmp(const char *a, const char *b);
 
-static void usage()
+static void usage(void)
 {
 	fprintf(stderr, "usage: %s <ver1> <ver2>\n\n", BASENAME);
-	fprintf(stderr, "return values:\n");
+	fprintf(stderr, "output values:\n");
 	fprintf(stderr, "  < 0 : if ver1 < ver2\n");
 	fprintf(stderr, "    0 : if ver1 == ver2\n");
 	fprintf(stderr, "  > 0 : if ver1 > ver2\n");
@@ -42,8 +39,8 @@ static void usage()
 
 int main(int argc, char *argv[])
 {
-	char s1[MAX_LEN] = "";
-	char s2[MAX_LEN] = "";
+	const char *s1 = "";
+	const char *s2 = "";
 	int ret;
 
 	if(argc == 1) {
@@ -56,19 +53,14 @@ int main(int argc, char *argv[])
 		usage();
 		return(0);
 	}
-	if(argc > 1) {
-		strncpy(s1, argv[1], MAX_LEN);
-		s1[MAX_LEN -1] = '\0';
-	}
 	if(argc > 2) {
-		strncpy(s2, argv[2], MAX_LEN);
-		s2[MAX_LEN -1] = '\0';
-	} else {
-		printf("0\n");
-		return(0);
+		s2 = argv[2];
+	}
+	if(argc > 1) {
+		s1 = argv[1];
 	}
 
 	ret = alpm_pkg_vercmp(s1, s2);
 	printf("%d\n", ret);
-	return(ret);
+	return(EXIT_SUCCESS);
 }