openwrt/package/lua/patches/400-luaposix_5.1.4-embedded.patch

--- a/src/Makefile
+++ b/src/Makefile
@@ -12,7 +12,7 @@ CFLAGS= -O2 -Wall $(MYCFLAGS)
 AR= ar rcu
 RANLIB= ranlib
 RM= rm -f
-LIBS= -lm $(MYLIBS)
+LIBS= -lm -lcrypt $(MYLIBS)
 
 MYCFLAGS=
 MYLDFLAGS=
@@ -29,7 +29,7 @@ CORE_O=	lapi.o lcode.o ldebug.o ldo.o ld
 	lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o  \
 	lundump.o lvm.o lzio.o lnum.o
 LIB_O=	lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o \
-	lstrlib.o loadlib.o linit.o
+	lstrlib.o loadlib.o linit.o lposix.o
 
 LUA_T=	lua
 LUA_O=	lua.o
--- a/src/linit.c
+++ b/src/linit.c
@@ -23,6 +23,7 @@ static const luaL_Reg lualibs[] = {
   {LUA_STRLIBNAME, luaopen_string},
   {LUA_MATHLIBNAME, luaopen_math},
   {LUA_DBLIBNAME, luaopen_debug},
+  {LUA_POSIXLIBNAME, luaopen_posix},
   {NULL, NULL}
 };
 
--- /dev/null
+++ b/src/lposix.c
@@ -0,0 +1,1139 @@
+/*
+* lposix.c
+* POSIX library for Lua 5.1.
+* Luiz Henrique de Figueiredo <[email protected]>
+* 07 Apr 2006 23:17:49
+* Clean up and bug fixes by Leo Razoumov <[email protected]> 2006-10-11 <!LR> 
+* Based on original by Claudio Terra for Lua 3.x.
+* With contributions by Roberto Ierusalimschy.
+*/
+
+#include <sys/stat.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+#include <sys/wait.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <glob.h>
+#include <grp.h>
+#include <libgen.h>
+#include <limits.h>
+#include <poll.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <time.h>
+#include <unistd.h>
+#include <utime.h>
+
+#define MYNAME		"posix"
+#define MYVERSION	MYNAME " library for " LUA_VERSION " / Jan 2008"
+
+#ifndef ENABLE_SYSLOG
+#define ENABLE_SYSLOG 	1
+#endif
+
+#include "lua.h"
+#include "lualib.h"
+#include "lauxlib.h"
+
+#include "modemuncher.c"
+
+/* compatibility with Lua 5.0 */
+#ifndef LUA_VERSION_NUM
+static int luaL_checkoption (lua_State *L, int narg, const char *def,
+                                 const char *const lst[]) {
+  const char *name = (def) ? luaL_optstring(L, narg, def) :
+                             luaL_checkstring(L, narg);
+  int i = luaL_findstring(name, lst);
+  if (i == -1)
+	luaL_argerror(L, narg, lua_pushfstring(L, "invalid option '%s'", name));
+  return i;
+}
+#define lua_pushinteger			lua_pushnumber
+#define lua_createtable(L,a,r)		lua_newtable(L)
+#define LUA_FILEHANDLE			"FILE*"
+
+#define lua_setfield(l,i,k)
+#define lua_getfield(l,i,k)
+
+#endif
+
+static const struct { char c; mode_t b; } M[] =
+{
+	{'r', S_IRUSR}, {'w', S_IWUSR}, {'x', S_IXUSR},
+	{'r', S_IRGRP}, {'w', S_IWGRP}, {'x', S_IXGRP},
+	{'r', S_IROTH}, {'w', S_IWOTH}, {'x', S_IXOTH},
+};
+
+
+static void pushmode(lua_State *L, mode_t mode)
+{
+	char m[9];
+	int i;
+	for (i=0; i<9; i++) m[i]= (mode & M[i].b) ? M[i].c : '-';
+	if (mode & S_ISUID) m[2]= (mode & S_IXUSR) ? 's' : 'S';
+	if (mode & S_ISGID) m[5]= (mode & S_IXGRP) ? 's' : 'S';
+	lua_pushlstring(L, m, 9);
+}
+
+typedef void (*Selector)(lua_State *L, int i, const void *data);
+
+static int doselection(lua_State *L, int i, int n, 
+                       const char *const S[], 
+                       Selector F, 
+                       const void *data)
+{
+	if (lua_isnone(L, i) || lua_istable(L, i))
+	{
+		int j;
+		if (lua_isnone(L, i)) lua_createtable(L,0,n); else lua_settop(L, i);
+		for (j=0; S[j]!=NULL; j++)
+		{
+			lua_pushstring(L, S[j]);
+			F(L, j, data);
+			lua_settable(L, -3);
+		}
+		return 1;
+	}
+	else
+	{
+		int k,n=lua_gettop(L);
+		for (k=i; k<=n; k++)
+		{
+			int j=luaL_checkoption(L, k, NULL, S);
+			F(L, j, data);
+			lua_replace(L, k);
+		}
+		return n-i+1;
+	}
+}
+#define doselection(L,i,S,F,d) (doselection)(L,i,sizeof(S)/sizeof(*S)-1,S,F,d)
+
+static int pusherror(lua_State *L, const char *info)
+{
+	lua_pushnil(L);
+	if (info==NULL)
+		lua_pushstring(L, strerror(errno));
+	else
+		lua_pushfstring(L, "%s: %s", info, strerror(errno));
+	lua_pushinteger(L, errno);
+	return 3;
+}
+
+static int pushresult(lua_State *L, int i, const char *info)
+{
+	if (i==-1) return pusherror(L, info);
+	lua_pushinteger(L, i);
+		return 1;
+}
+
+static void badoption(lua_State *L, int i, const char *what, int option)
+{
+	luaL_argerror(L, 2,
+		lua_pushfstring(L, "unknown %s option '%c'", what, option));
+}
+
+static uid_t mygetuid(lua_State *L, int i)
+{
+	if (lua_isnone(L, i))
+		return -1;
+	else if (lua_isnumber(L, i))
+		return (uid_t) lua_tonumber(L, i);
+	else if (lua_isstring(L, i))
+	{
+		struct passwd *p=getpwnam(lua_tostring(L, i));
+		return (p==NULL) ? -1 : p->pw_uid;
+	}
+	else
+		return luaL_typerror(L, i, "string or number");
+}
+
+static gid_t mygetgid(lua_State *L, int i)
+{
+	if (lua_isnone(L, i))
+		return -1;
+	else if (lua_isnumber(L, i))
+		return (gid_t) lua_tonumber(L, i);
+	else if (lua_isstring(L, i))
+	{
+		struct group *g=getgrnam(lua_tostring(L, i));
+		return (g==NULL) ? -1 : g->gr_gid;
+	}
+	else
+		return luaL_typerror(L, i, "string or number");
+}
+
+
+static int Perrno(lua_State *L)			/** errno([n]) */
+{
+	int n = luaL_optint(L, 1, errno);
+	lua_pushstring(L, strerror(n));
+	lua_pushinteger(L, n);
+	return 2;
+}
+
+
+static int Pbasename(lua_State *L)		/** basename(path) */
+{
+	char b[PATH_MAX];
+	size_t len;
+	const char *path = luaL_checklstring(L, 1, &len);
+	if (len>=sizeof(b)) luaL_argerror(L, 1, "too long");
+	lua_pushstring(L, basename(strcpy(b,path)));
+	return 1;
+}
+
+
+static int Pdirname(lua_State *L)		/** dirname(path) */
+{
+	char b[PATH_MAX];
+	size_t len;
+	const char *path = luaL_checklstring(L, 1, &len);
+	if (len>=sizeof(b)) luaL_argerror(L, 1, "too long");
+	lua_pushstring(L, dirname(strcpy(b,path)));
+	return 1;
+}
+
+
+static int Pdir(lua_State *L)			/** dir([path]) */
+{
+	const char *path = luaL_optstring(L, 1, ".");
+	DIR *d = opendir(path);
+	if (d == NULL)
+		return pusherror(L, path);
+	else
+	{
+		int i;
+		struct dirent *entry;
+		lua_newtable(L);
+		for (i=1; (entry = readdir(d)) != NULL; i++)
+		{
+			lua_pushstring(L, entry->d_name);
+			lua_rawseti(L, -2, i);
+		}
+		closedir(d);
+		lua_pushinteger(L, i-1);
+		return 2;
+	}
+}
+
+static int Pglob(lua_State *L)                  /** glob(pattern) */
+{
+ const char *pattern = luaL_optstring(L, 1, "*");
+ glob_t globres;
+
+ if (glob(pattern, 0, NULL, &globres))
+   return pusherror(L, pattern);
+ else
+   {
+     int i;
+     lua_newtable(L);
+     for (i=1; i<=globres.gl_pathc; i++) {
+       lua_pushstring(L, globres.gl_pathv[i-1]);
+       lua_rawseti(L, -2, i);
+     }
+     globfree(&globres);
+     return 1;
+   }
+}
+
+static int aux_files(lua_State *L)
+{
+	DIR **p = (DIR **)lua_touserdata(L, lua_upvalueindex(1));
+	DIR *d = *p;
+	struct dirent *entry;
+	if (d == NULL) return 0;
+	entry = readdir(d);
+	if (entry == NULL)
+	{
+		closedir(d);
+		*p=NULL;
+		return 0;
+	}
+	else
+	{
+		lua_pushstring(L, entry->d_name);
+	return 1;
+	}
+}
+
+static int dir_gc (lua_State *L)
+{
+	DIR *d = *(DIR **)lua_touserdata(L, 1);
+	if (d!=NULL) closedir(d);
+	return 0;
+}
+
+static int Pfiles(lua_State *L)			/** files([path]) */
+{
+	const char *path = luaL_optstring(L, 1, ".");
+	DIR **d = (DIR **)lua_newuserdata(L, sizeof(DIR *));
+	if (luaL_newmetatable(L, MYNAME " dir handle"))
+	{
+		lua_pushliteral(L, "__gc");
+		lua_pushcfunction(L, dir_gc);
+		lua_settable(L, -3);
+	}
+	lua_setmetatable(L, -2);
+	*d = opendir(path);
+	if (*d == NULL) return pusherror(L, path);
+		lua_pushcclosure(L, aux_files, 1);
+		return 1;
+}
+
+
+static int Pgetcwd(lua_State *L)		/** getcwd() */
+{
+	char b[PATH_MAX];
+	if (getcwd(b, sizeof(b)) == NULL) return pusherror(L, ".");
+	lua_pushstring(L, b);
+		return 1;
+}
+
+
+static int Pmkdir(lua_State *L)			/** mkdir(path) */
+{
+	const char *path = luaL_checkstring(L, 1);
+	return pushresult(L, mkdir(path, 0777), path);
+}
+
+
+static int Pchdir(lua_State *L)			/** chdir(path) */
+{
+	const char *path = luaL_checkstring(L, 1);
+	return pushresult(L, chdir(path), path);
+}
+
+static int Prmdir(lua_State *L)			/** rmdir(path) */
+{
+	const char *path = luaL_checkstring(L, 1);
+	return pushresult(L, rmdir(path), path);
+}
+
+
+static int Punlink(lua_State *L)		/** unlink(path) */
+{
+	const char *path = luaL_checkstring(L, 1);
+	return pushresult(L, unlink(path), path);
+}
+
+static int Plink(lua_State *L)			/** link(old,new,[symbolic]) */
+{
+	const char *oldpath = luaL_checkstring(L, 1);
+	const char *newpath = luaL_checkstring(L, 2);
+	return pushresult(L,
+		(lua_toboolean(L,3) ? symlink : link)(oldpath, newpath), NULL);
+}
+
+
+static int Preadlink(lua_State *L)		/** readlink(path) */
+{
+	char b[PATH_MAX];
+	const char *path = luaL_checkstring(L, 1);
+	int n = readlink(path, b, sizeof(b));
+	if (n==-1) return pusherror(L, path);
+	lua_pushlstring(L, b, n);
+	return 1;
+}
+
+
+static int Paccess(lua_State *L)		/** access(path,[mode]) */
+{
+	int mode=F_OK;
+	const char *path=luaL_checkstring(L, 1);
+	const char *s;
+	for (s=luaL_optstring(L, 2, "f"); *s!=0 ; s++)
+		switch (*s)
+		{
+			case ' ': break;
+			case 'r': mode |= R_OK; break;
+			case 'w': mode |= W_OK; break;
+			case 'x': mode |= X_OK; break;
+			case 'f': mode |= F_OK; break;
+			default: badoption(L, 2, "mode", *s); break;
+		}
+	return pushresult(L, access(path, mode), path);
+}
+
+
+static int myfclose (lua_State *L) {
+  FILE **p = (FILE **)lua_touserdata(L, 1);
+  int rc = fclose(*p);
+  if (rc == 0) *p = NULL;
+  return pushresult(L, rc, NULL);
+} 
+
+static int pushfile (lua_State *L, int id, const char *mode) {
+  FILE **f = (FILE **)lua_newuserdata(L, sizeof(FILE *));
+  *f = NULL;
+  luaL_getmetatable(L, LUA_FILEHANDLE);
+  lua_setmetatable(L, -2);
+  lua_getfield(L, LUA_REGISTRYINDEX, "POSIX_PIPEFILE");
+  if (lua_isnil(L, -1)) {
+    lua_pop(L, 1);
+    lua_newtable(L);
+    lua_pushvalue(L, -1);
+    lua_pushcfunction(L, myfclose);
+    lua_setfield(L, -2, "__close");
+    lua_setfield(L, LUA_REGISTRYINDEX, "POSIX_PIPEFILE");
+  }
+  lua_setfenv(L, -2);
+  *f = fdopen(id, mode);
+  return (*f != NULL);
+}
+
+static int Ppipe(lua_State *L)			/** pipe() */
+{
+	int fd[2];
+	if (pipe(fd)==-1) return pusherror(L, NULL);
+	if (!pushfile(L, fd[0], "r") || !pushfile(L, fd[1], "w"))
+		return pusherror(L, "pipe");
+	return 2;
+}
+
+
+static int Pfileno(lua_State *L)	/** fileno(filehandle) */
+{
+	FILE *f = *(FILE**) luaL_checkudata(L, 1, LUA_FILEHANDLE);
+	return pushresult(L, fileno(f), NULL);
+}
+
+
+static int Pfdopen(lua_State *L)	/** fdopen(fd, mode) */
+{
+	int fd = luaL_checkint(L, 1);
+	const char *mode = luaL_checkstring(L, 2);
+	if (!pushfile(L, fd, mode))
+		return pusherror(L, "fdpoen");
+	return 1;
+}
+
+
+/* helper func for Pdup */
+static const char *filemode(int fd)
+{
+	const char *m;
+	int mode = fcntl(fd, F_GETFL);
+	if (mode < 0)
+		return NULL;
+	switch (mode & O_ACCMODE) {
+		case O_RDONLY:  m = "r"; break;
+		case O_WRONLY:  m = "w"; break;
+		default:    	m = "rw"; break;
+	}
+	return m;
+}
+
+static int Pdup(lua_State *L)			/** dup(old,[new]) */
+{
+	FILE **oldf = (FILE**)luaL_checkudata(L, 1, LUA_FILEHANDLE);
+  	FILE **newf = (FILE **)lua_touserdata(L, 2);
+	int fd;
+	const char *msg = "dup2";
+	fflush(*newf);
+	if (newf == NULL) {
+		fd = dup(fileno(*oldf));
+		msg = "dup";
+	} else {
+		fflush(*newf);
+		fd = dup2(fileno(*oldf), fileno(*newf));
+	}
+
+	if ((fd < 0) || !pushfile(L, fd, filemode(fd)))
+		return pusherror(L, msg);
+	return 1;
+}
+
+
+static int Pmkfifo(lua_State *L)		/** mkfifo(path) */
+{
+	const char *path = luaL_checkstring(L, 1);
+	return pushresult(L, mkfifo(path, 0777), path);
+}
+
+
+static int runexec(lua_State *L, int use_shell)
+{
+	const char *path = luaL_checkstring(L, 1);
+	int i,n=lua_gettop(L);
+	char **argv = lua_newuserdata(L,(n+1)*sizeof(char*));
+	argv[0] = (char*)path;
+	for (i=1; i<n; i++) argv[i] = (char*)luaL_checkstring(L, i+1);
+	argv[n] = NULL;
+	if (use_shell) {
+		execvp(path, argv);
+	} else {
+		execv(path, argv);
+	}
+	return pusherror(L, path);
+}
+
+
+static int Pexec(lua_State *L)			/** exec(path,[args]) */
+{
+	return runexec(L, 0);
+}
+
+
+static int Pexecp(lua_State *L)			/** execp(path,[args]) */
+{
+	return runexec(L, 1);
+}
+
+
+static int Pfork(lua_State *L)			/** fork() */
+{
+	return pushresult(L, fork(), NULL);
+}
+
+/* from http://lua-users.org/lists/lua-l/2007-11/msg00346.html */
+static int Ppoll(lua_State *L)   /** poll(filehandle, timeout) */
+{
+	struct pollfd fds;
+	FILE* file = *(FILE**)luaL_checkudata(L,1,LUA_FILEHANDLE);
+	int timeout = luaL_checkint(L,2);
+	fds.fd = fileno(file);
+	fds.events = POLLIN;
+	return pushresult(L, poll(&fds,1,timeout), NULL);
+}
+
+static int Pwait(lua_State *L)			/** wait([pid]) */
+{
+	int status;
+	pid_t pid = luaL_optint(L, 1, -1);
+	pid = waitpid(pid, &status, 0);
+	if (pid == -1) return pusherror(L, NULL);
+	lua_pushinteger(L, pid);
+	if (WIFEXITED(status))
+	{
+		lua_pushliteral(L,"exited");
+		lua_pushinteger(L, WEXITSTATUS(status));
+		return 3;
+	}
+	else if (WIFSIGNALED(status))
+	{
+		lua_pushliteral(L,"killed");
+		lua_pushinteger(L, WTERMSIG(status));
+		return 3;
+	}
+	else if (WIFSTOPPED(status))
+	{
+		lua_pushliteral(L,"stopped");
+		lua_pushinteger(L, WSTOPSIG(status));
+		return 3;
+	}
+	return 1;
+}
+
+
+static int Pkill(lua_State *L)			/** kill(pid,[sig]) */
+{
+	pid_t pid = luaL_checkint(L, 1);
+	int sig = luaL_optint(L, 2, SIGTERM);
+	return pushresult(L, kill(pid, sig), NULL);
+}
+
+static int Psetpid(lua_State *L)		/** setpid(option,...) */
+{
+	const char *what=luaL_checkstring(L, 1);
+	switch (*what)
+	{
+		case 'U':
+			return pushresult(L, seteuid(mygetuid(L, 2)), NULL);
+		case 'u':
+			return pushresult(L, setuid(mygetuid(L, 2)), NULL);
+		case 'G':
+			return pushresult(L, setegid(mygetgid(L, 2)), NULL);
+		case 'g':
+			return pushresult(L, setgid(mygetgid(L, 2)), NULL);
+		case 's':
+			return pushresult(L, setsid(), NULL);
+		case 'p':
+		{
+			pid_t pid  = luaL_checkint(L, 2);
+			pid_t pgid = luaL_checkint(L, 3);
+			return pushresult(L, setpgid(pid,pgid), NULL);
+		}
+		default:
+			badoption(L, 2, "id", *what);
+			return 0;
+	}
+}
+
+
+static int Psleep(lua_State *L)			/** sleep(seconds) */
+{
+	unsigned int seconds = luaL_checkint(L, 1);
+	lua_pushinteger(L, sleep(seconds));
+	return 1;
+}
+
+
+static int Psetenv(lua_State *L)		/** setenv(name,value,[over]) */
+{
+	const char *name=luaL_checkstring(L, 1);
+	const char *value=luaL_optstring(L, 2, NULL);
+	if (value==NULL)
+	{
+	unsetenv(name);
+		return pushresult(L, 0, NULL);
+	}
+	else
+	{
+		int overwrite=lua_isnoneornil(L, 3) || lua_toboolean(L, 3);
+		return pushresult(L, setenv(name,value,overwrite), NULL);
+	}
+}
+
+
+static int Pgetenv(lua_State *L)		/** getenv([name]) */
+{
+	if (lua_isnone(L, 1))
+	{
+		extern char **environ;
+		char **e;
+		lua_newtable(L);
+		for (e=environ; *e!=NULL; e++)
+		{
+			char *s=*e;
+			char *eq=strchr(s, '=');
+			if (eq==NULL)		/* will this ever happen? */
+			{
+				lua_pushstring(L,s);
+				lua_pushboolean(L,1);
+			}
+			else
+			{
+				lua_pushlstring(L,s,eq-s);
+				lua_pushstring(L,eq+1);
+			}
+			lua_settable(L,-3);
+		}
+	}
+	else
+		lua_pushstring(L, getenv(luaL_checkstring(L, 1)));
+	return 1;
+}
+
+static int Pumask(lua_State *L)			/** umask([mode]) */
+{/* <!LR> from old lposix-5.0 version */
+	char m[10];
+	mode_t mode;
+	umask(mode=umask(0));
+	mode=(~mode)&0777;
+	if (!lua_isnone(L, 1))
+	{
+		if (mode_munch(&mode, luaL_checkstring(L, 1)))
+		{
+			lua_pushnil(L);
+			return 1;
+		}
+		mode&=0777;
+		umask(~mode);
+	}
+	modechopper(mode, m);
+	lua_pushstring(L, m);
+	return 1;
+}
+
+
+static int Pchmod(lua_State *L)			/** chmod(path,mode) */
+{
+	mode_t mode;
+	struct stat s;
+	const char *path = luaL_checkstring(L, 1);
+	const char *modestr = luaL_checkstring(L, 2);
+	if (stat(path, &s)) return pusherror(L, path);
+	mode = s.st_mode;
+	if (mode_munch(&mode, modestr)) luaL_argerror(L, 2, "bad mode");
+	return pushresult(L, chmod(path, mode), path);
+}
+
+
+static int Pchown(lua_State *L)			/** chown(path,uid,gid) */
+{
+	const char *path = luaL_checkstring(L, 1);
+	uid_t uid = mygetuid(L, 2);
+	gid_t gid = mygetgid(L, 3);
+	return pushresult(L, chown(path, uid, gid), path);
+}
+
+
+static int Putime(lua_State *L)			/** utime(path,[mtime,atime]) */
+{
+	struct utimbuf times;
+	time_t currtime = time(NULL);
+	const char *path = luaL_checkstring(L, 1);
+	times.modtime = luaL_optnumber(L, 2, currtime);
+	times.actime  = luaL_optnumber(L, 3, currtime);
+	return pushresult(L, utime(path, &times), path);
+}
+
+
+static void FgetID(lua_State *L, int i, const void *data)
+{
+	switch (i)
+	{
+		case 0:	lua_pushinteger(L, getegid());	break;
+		case 1:	lua_pushinteger(L, geteuid());	break;
+		case 2:	lua_pushinteger(L, getgid());	break;
+		case 3:	lua_pushinteger(L, getuid());	break;
+		case 4:	lua_pushinteger(L, getpgrp());	break;
+		case 5:	lua_pushinteger(L, getpid());	break;
+		case 6:	lua_pushinteger(L, getppid());	break;
+	}
+}
+
+static const char *const SgetID[] =
+{
+	"egid", "euid", "gid", "uid", "pgrp", "pid", "ppid", NULL
+};
+
+static int Pgetpid(lua_State *L)		/** getpid([options]) */
+{
+	return doselection(L, 1, SgetID, FgetID, NULL);
+}
+
+
+static int Phostid(lua_State *L)		/** hostid() */
+{
+	char b[32];
+	sprintf(b,"%ld",gethostid());
+	lua_pushstring(L, b);
+	return 1;
+}
+
+
+static int Pttyname(lua_State *L)		/** ttyname([fd]) */
+{
+	int fd=luaL_optint(L, 1, 0);
+	lua_pushstring(L, ttyname(fd));
+	return 1;
+}
+
+
+static int Pctermid(lua_State *L)		/** ctermid() */
+{
+	char b[L_ctermid];
+	lua_pushstring(L, ctermid(b));
+	return 1;
+}
+
+
+static int Pgetlogin(lua_State *L)		/** getlogin() */
+{
+	lua_pushstring(L, getlogin());
+	return 1;
+}
+
+
+static void Fgetpasswd(lua_State *L, int i, const void *data)
+{
+	const struct passwd *p=data;
+	switch (i)
+	{
+		case 0: lua_pushstring(L, p->pw_name); break;
+		case 1: lua_pushinteger(L, p->pw_uid); break;
+		case 2: lua_pushinteger(L, p->pw_gid); break;
+		case 3: lua_pushstring(L, p->pw_dir); break;
+		case 4: lua_pushstring(L, p->pw_shell); break;
+/* not strictly POSIX */
+		case 5: lua_pushstring(L, p->pw_gecos); break;
+		case 6: lua_pushstring(L, p->pw_passwd); break;
+	}
+}
+
+static const char *const Sgetpasswd[] =
+{
+	"name", "uid", "gid", "dir", "shell", "gecos", "passwd", NULL
+};
+
+
+static int Pgetpasswd(lua_State *L)		/** getpasswd(name|id,[sel]) */
+{
+	struct passwd *p=NULL;
+	if (lua_isnoneornil(L, 1))
+		p = getpwuid(geteuid());
+	else if (lua_isnumber(L, 1))
+		p = getpwuid((uid_t)lua_tonumber(L, 1));
+	else if (lua_isstring(L, 1))
+		p = getpwnam(lua_tostring(L, 1));
+	else
+		luaL_typerror(L, 1, "string or number");
+	if (p==NULL)
+		lua_pushnil(L);
+	else
+		return doselection(L, 2, Sgetpasswd, Fgetpasswd, p);
+	return 1;
+}
+
+
+static int Pgetgroup(lua_State *L)		/** getgroup(name|id) */
+{
+	struct group *g=NULL;
+	if (lua_isnumber(L, 1))
+		g = getgrgid((gid_t)lua_tonumber(L, 1));
+	else if (lua_isstring(L, 1))
+		g = getgrnam(lua_tostring(L, 1));
+	else
+		luaL_typerror(L, 1, "string or number");
+	if (g==NULL)
+		lua_pushnil(L);
+	else
+	{
+		int i;
+		lua_newtable(L);
+		lua_pushliteral(L, "name");
+		lua_pushstring(L, g->gr_name);
+		lua_settable(L, -3);
+		lua_pushliteral(L, "gid");
+		lua_pushinteger(L, g->gr_gid);
+		lua_settable(L, -3);
+		for (i=0; g->gr_mem[i]!=NULL; i++)
+		{
+			lua_pushstring(L, g->gr_mem[i]);
+			lua_rawseti(L, -2, i);
+		}
+	}
+	return 1;
+}
+
+
+struct mytimes
+{
+ struct tms t;
+ clock_t elapsed;
+};
+
+/* #define pushtime(L,x)	lua_pushnumber(L,((lua_Number)x)/CLOCKS_PER_SEC) */
+#define pushtime(L,x)	lua_pushnumber(L, ((lua_Number)x)/clk_tck)
+
+static void Ftimes(lua_State *L, int i, const void *data)
+{
+    static long clk_tck = 0; 
+	const struct mytimes *t=data;
+
+    if( !clk_tck){ clk_tck= sysconf(_SC_CLK_TCK);}
+	switch (i)
+	{
+		case 0: pushtime(L, t->t.tms_utime); break;
+		case 1: pushtime(L, t->t.tms_stime); break;
+		case 2: pushtime(L, t->t.tms_cutime); break;
+		case 3: pushtime(L, t->t.tms_cstime); break;
+		case 4: pushtime(L, t->elapsed); break;
+	}
+}
+
+static const char *const Stimes[] =
+{
+	"utime", "stime", "cutime", "cstime", "elapsed", NULL
+};
+
+static int Ptimes(lua_State *L)			/** times([options]) */
+{
+	struct mytimes t;
+	t.elapsed = times(&t.t);
+	return doselection(L, 1, Stimes, Ftimes, &t);
+}
+
+
+static const char *filetype(mode_t m)
+{
+	if (S_ISREG(m))		return "regular";
+	else if (S_ISLNK(m))	return "link";
+	else if (S_ISDIR(m))	return "directory";
+	else if (S_ISCHR(m))	return "character device";
+	else if (S_ISBLK(m))	return "block device";
+	else if (S_ISFIFO(m))	return "fifo";
+	else if (S_ISSOCK(m))	return "socket";
+	else			return "?";
+}
+
+static void Fstat(lua_State *L, int i, const void *data)
+{
+	const struct stat *s=data;
+	switch (i)
+	{
+		case 0: pushmode(L, s->st_mode); break;
+		case 1: lua_pushinteger(L, s->st_ino); break;
+		case 2: lua_pushinteger(L, s->st_dev); break;
+		case 3: lua_pushinteger(L, s->st_nlink); break;
+		case 4: lua_pushinteger(L, s->st_uid); break;
+		case 5: lua_pushinteger(L, s->st_gid); break;
+		case 6: lua_pushinteger(L, s->st_size); break;
+		case 7: lua_pushinteger(L, s->st_atime); break;
+		case 8: lua_pushinteger(L, s->st_mtime); break;
+		case 9: lua_pushinteger(L, s->st_ctime); break;
+		case 10:lua_pushstring(L, filetype(s->st_mode)); break;
+	}
+}
+
+static const char *const Sstat[] =
+{
+	"mode", "ino", "dev", "nlink", "uid", "gid",
+	"size", "atime", "mtime", "ctime", "type",
+	NULL
+};
+
+static int Pstat(lua_State *L)			/** stat(path,[options]) */
+{
+	struct stat s;
+	const char *path=luaL_checkstring(L, 1);
+	if (lstat(path,&s)==-1) return pusherror(L, path);
+	return doselection(L, 2, Sstat, Fstat, &s);
+}
+
+
+static int Puname(lua_State *L)			/** uname([string]) */
+{
+	struct utsname u;
+	luaL_Buffer b;
+	const char *s;
+	if (uname(&u)==-1) return pusherror(L, NULL);
+	luaL_buffinit(L, &b);
+	for (s=luaL_optstring(L, 1, "%s %n %r %v %m"); *s; s++)
+		if (*s!='%')
+			luaL_putchar(&b, *s);
+		else switch (*++s)
+		{
+			case '%': luaL_putchar(&b, *s); break;
+			case 'm': luaL_addstring(&b,u.machine); break;
+			case 'n': luaL_addstring(&b,u.nodename); break;
+			case 'r': luaL_addstring(&b,u.release); break;
+			case 's': luaL_addstring(&b,u.sysname); break;
+			case 'v': luaL_addstring(&b,u.version); break;
+			default: badoption(L, 2, "format", *s); break;
+		}
+	luaL_pushresult(&b);
+	return 1;
+}
+
+
+static const int Kpathconf[] =
+{
+	_PC_LINK_MAX, _PC_MAX_CANON, _PC_MAX_INPUT, _PC_NAME_MAX, _PC_PATH_MAX,
+	_PC_PIPE_BUF, _PC_CHOWN_RESTRICTED, _PC_NO_TRUNC, _PC_VDISABLE,
+	-1
+};
+
+static void Fpathconf(lua_State *L, int i, const void *data)
+{
+	const char *path=data;
+	lua_pushinteger(L, pathconf(path, Kpathconf[i]));
+}
+
+static const char *const Spathconf[] =
+{
+	"link_max", "max_canon", "max_input", "name_max", "path_max",
+	"pipe_buf", "chown_restricted", "no_trunc", "vdisable",
+	NULL
+};
+
+static int Ppathconf(lua_State *L)		/** pathconf([path,options]) */
+{
+	const char *path = luaL_optstring(L, 1, ".");
+	return doselection(L, 2, Spathconf, Fpathconf, path);
+}
+
+
+static const int Ksysconf[] =
+{
+	_SC_ARG_MAX, _SC_CHILD_MAX, _SC_CLK_TCK, _SC_NGROUPS_MAX, _SC_STREAM_MAX,
+	_SC_TZNAME_MAX, _SC_OPEN_MAX, _SC_JOB_CONTROL, _SC_SAVED_IDS, _SC_VERSION,
+	-1
+};
+
+static void Fsysconf(lua_State *L, int i, const void *data)
+{
+	lua_pushinteger(L, sysconf(Ksysconf[i]));
+}
+
+static const char *const Ssysconf[] =
+{
+	"arg_max", "child_max", "clk_tck", "ngroups_max", "stream_max",
+	"tzname_max", "open_max", "job_control", "saved_ids", "version",
+	NULL
+};
+
+static int Psysconf(lua_State *L)		/** sysconf([options]) */
+{
+	return doselection(L, 1, Ssysconf, Fsysconf, NULL);
+}
+
+#if ENABLE_SYSLOG
+/* syslog funcs */
+static int Popenlog(lua_State *L)	/** openlog(ident, [option], [facility]) */
+{
+	const char *ident = luaL_checkstring(L, 1);
+	int option = 0;
+	int facility = luaL_optint(L, 3, LOG_USER);
+	const char *s = luaL_optstring(L, 2, "");
+	while (*s) {
+		switch (*s) {
+			case ' ': break;
+			case 'c': option |= LOG_CONS; break;
+			case 'n': option |= LOG_NDELAY; break;
+			case 'e': option |= LOG_PERROR; break;
+			case 'p': option |= LOG_PID; break;
+			default: badoption(L, 2, "option", *s); break;
+		}
+		s++;
+	}
+	openlog(ident, option, facility);
+	return 0;
+}
+
+
+static int Psyslog(lua_State *L)		/** syslog(priority, message) */
+{
+	int priority = luaL_checkint(L, 1);
+	const char *msg = luaL_checkstring(L, 2);
+	syslog(priority, "%s", msg);
+	return 0;
+}
+
+
+static int Pcloselog(lua_State *L)		/** closelog() */
+{
+	closelog();
+	return 0;
+}
+#endif
+
+/*
+ * XXX: GNU and BSD handle the forward declaration of crypt() in different
+ * and annoying ways (especially GNU). Declare it here just to make sure
+ * that it's there
+ */
+char *crypt(const char *, const char *);
+
+static int Pcrypt(lua_State *L)
+{
+	const char *str, *salt;
+	char *res;
+
+	str = luaL_checkstring(L, 1);
+	salt = luaL_checkstring(L, 2);
+	if (strlen(salt) < 2)
+		luaL_error(L, "not enough salt");
+
+	res = crypt(str, salt);
+	lua_pushstring(L, res);
+
+	return 1;
+}
+
+static const luaL_reg R[] =
+{
+	{"access",		Paccess},
+	{"basename",		Pbasename},
+	{"chdir",		Pchdir},
+	{"chmod",		Pchmod},
+	{"chown",		Pchown},
+	{"crypt",		Pcrypt},
+	{"ctermid",		Pctermid},
+	{"dirname",		Pdirname},
+	{"dir",			Pdir},
+	{"dup",			Pdup},
+	{"errno",		Perrno},
+	{"exec",		Pexec},
+	{"execp",		Pexecp},
+	{"fdopen",		Pfdopen},
+	{"fileno",		Pfileno},
+	{"files",		Pfiles},
+	{"fork",		Pfork},
+	{"getcwd",		Pgetcwd},
+	{"getenv",		Pgetenv},
+	{"getgroup",		Pgetgroup},
+	{"getlogin",		Pgetlogin},
+	{"getpasswd",		Pgetpasswd},
+	{"getpid",		Pgetpid},
+	{"glob",		Pglob},
+	{"hostid",		Phostid},
+	{"kill",		Pkill},
+	{"link",		Plink},
+	{"mkdir",		Pmkdir},
+	{"mkfifo",		Pmkfifo},
+	{"pathconf",		Ppathconf},
+	{"pipe",		Ppipe},
+	{"readlink",		Preadlink},
+	{"rmdir",		Prmdir},
+	{"rpoll",		Ppoll},
+	{"setenv",		Psetenv},
+	{"setpid",		Psetpid},
+	{"sleep",		Psleep},
+	{"stat",		Pstat},
+	{"sysconf",		Psysconf},
+	{"times",		Ptimes},
+	{"ttyname",		Pttyname},
+	{"unlink",		Punlink},
+	{"umask",		Pumask},
+	{"uname",		Puname},
+	{"utime",		Putime},
+	{"wait",		Pwait},
+
+#if ENABLE_SYSLOG
+	{"openlog",		Popenlog},
+	{"syslog",		Psyslog},
+	{"closelog",		Pcloselog},
+#endif
+
+	{NULL,			NULL}
+};
+
+#define set_const(key, value)		\
+	lua_pushliteral(L, key);	\
+	lua_pushnumber(L, value);	\
+	lua_settable(L, -3)
+
+LUALIB_API int luaopen_posix (lua_State *L)
+{
+	luaL_register(L,MYNAME,R);
+	lua_pushliteral(L,"version");		/** version */
+	lua_pushliteral(L,MYVERSION);
+	lua_settable(L,-3);
+
+#if ENABLE_SYSLOG
+	set_const("LOG_AUTH", LOG_AUTH);
+	set_const("LOG_AUTHPRIV", LOG_AUTHPRIV);
+	set_const("LOG_CRON", LOG_CRON);
+	set_const("LOG_DAEMON", LOG_DAEMON);
+	set_const("LOG_FTP", LOG_FTP);
+	set_const("LOG_KERN", LOG_KERN);
+	set_const("LOG_LOCAL0", LOG_LOCAL0);
+	set_const("LOG_LOCAL1", LOG_LOCAL1);
+	set_const("LOG_LOCAL2", LOG_LOCAL2);
+	set_const("LOG_LOCAL3", LOG_LOCAL3);
+	set_const("LOG_LOCAL4", LOG_LOCAL4);
+	set_const("LOG_LOCAL5", LOG_LOCAL5);
+	set_const("LOG_LOCAL6", LOG_LOCAL6);
+	set_const("LOG_LOCAL7", LOG_LOCAL7);
+	set_const("LOG_LPR", LOG_LPR);
+	set_const("LOG_MAIL", LOG_MAIL);
+	set_const("LOG_NEWS", LOG_NEWS);
+	set_const("LOG_SYSLOG", LOG_SYSLOG);
+	set_const("LOG_USER", LOG_USER);
+	set_const("LOG_UUCP", LOG_UUCP);
+
+	set_const("LOG_EMERG", LOG_EMERG);
+	set_const("LOG_ALERT", LOG_ALERT);
+	set_const("LOG_CRIT", LOG_CRIT);
+	set_const("LOG_ERR", LOG_ERR);
+	set_const("LOG_WARNING", LOG_WARNING);
+	set_const("LOG_NOTICE", LOG_NOTICE);
+	set_const("LOG_INFO", LOG_INFO);
+	set_const("LOG_DEBUG", LOG_DEBUG);
+#endif
+
+
+	return 1;
+}
+
+/*EOF*/
--- a/src/lualib.h
+++ b/src/lualib.h
@@ -39,6 +39,9 @@ LUALIB_API int (luaopen_debug) (lua_Stat
 #define LUA_LOADLIBNAME	"package"
 LUALIB_API int (luaopen_package) (lua_State *L);
 
+#define LUA_POSIXLIBNAME "posix"
+LUALIB_API int (luaopen_posix) (lua_State *L);
+
 
 /* open all previous libraries */
 LUALIB_API void (luaL_openlibs) (lua_State *L); 
--- /dev/null
+++ b/src/modemuncher.c
@@ -0,0 +1,261 @@
+/* 
+	Mode Muncher -- modemuncher.c
+	961110 Claudio Terra
+
+	munch vb
+	[ME monchen, perh. influenced by MF mangier to eat --more at MANGER]
+	:to chew with a crunching sound: eat with relish
+	:to chew food with a crunching sound: eat food with relish
+	--munch-er n
+		
+	The NeXT Digital Edition of Webster's Ninth New Collegiate Dictionary
+	and Webster's Collegiate Thesaurus
+*/
+
+/* struct for rwx <-> POSIX constant lookup tables */
+struct modeLookup
+{
+	char rwx;
+	mode_t bits;
+};
+
+typedef struct modeLookup modeLookup;
+
+static modeLookup modesel[] =
+{
+	/* RWX char				Posix Constant */
+	{'r',					S_IRUSR},
+	{'w',					S_IWUSR},
+	{'x',					S_IXUSR},
+	
+	{'r',					S_IRGRP},
+	{'w',					S_IWGRP},
+	{'x',					S_IXGRP},
+	
+	{'r',					S_IROTH},
+	{'w',					S_IWOTH},
+	{'x',					S_IXOTH},
+	{0, 					(mode_t)-1} /* do not delete this line */
+};
+
+
+
+static int rwxrwxrwx(mode_t *mode, const char *p)
+{
+	int count;
+	mode_t tmp_mode = *mode;
+	
+	tmp_mode &= ~(S_ISUID | S_ISGID); /* turn off suid and sgid flags */
+	for (count=0; count<9; count ++)
+	{
+		if (*p == modesel[count].rwx) tmp_mode |= modesel[count].bits;	/* set a bit */
+		else if (*p == '-') tmp_mode &= ~modesel[count].bits;			/* clear a bit */
+		else if (*p=='s') switch(count)
+		{
+			case 2: /* turn on suid flag */
+			tmp_mode |= S_ISUID | S_IXUSR;
+			break;
+			
+			case 5: /* turn on sgid flag */
+			tmp_mode |= S_ISGID | S_IXGRP;
+			break;
+
+			default:
+			return -4; /* failed! -- bad rwxrwxrwx mode change */
+			break;
+		}
+		p++;
+	}
+	*mode = tmp_mode;
+	return 0;
+}
+
+static void modechopper(mode_t mode, char *p)
+{
+	/* requires char p[10] */
+	int count;
+	char *pp;
+	
+	pp=p;
+	
+	for (count=0; count<9; count ++)
+	{
+		if (mode & modesel[count].bits) *p = modesel[count].rwx;
+		else *p='-';
+		
+		p++;
+	}
+	*p=0; /* to finish the string */
+	
+	/* dealing with suid and sgid flags */
+	if (mode & S_ISUID) pp[2] = (mode & S_IXUSR) ? 's' : 'S';
+	if (mode & S_ISGID) pp[5] = (mode & S_IXGRP) ? 's' : 'S';
+
+}
+
+static int mode_munch(mode_t *mode, const char* p)
+{
+
+	char op=0;
+	mode_t affected_bits, ch_mode;
+	int doneFlag = 0;
+#ifdef DEBUG
+char tmp[10];
+#endif
+
+#ifdef DEBUG
+modechopper(*mode, tmp);
+printf("modemuncher: got base mode = %s\n", tmp);
+#endif
+
+	while (!doneFlag)
+	{
+		/* step 0 -- clear temporary variables */
+		affected_bits=0;
+		ch_mode=0;
+		
+		/* step 1 -- who's affected? */
+
+#ifdef DEBUG
+printf("modemuncher step 1\n");
+#endif
+		
+		/* mode string given in rwxrwxrwx format */
+		if (*p== 'r' || *p == '-') return rwxrwxrwx(mode, p);
+		
+		/* mode string given in ugoa+-=rwx format */
+		for ( ; ; p++)
+			switch (*p)
+			{
+				case 'u':
+				affected_bits |= 04700;
+				break;
+				
+				case 'g':
+				affected_bits |= 02070;
+				break;
+				
+				case 'o':
+				affected_bits |= 01007;
+				break;
+				
+				case 'a':
+				affected_bits |= 07777;
+				break;
+				
+				/* ignore spaces */
+				case ' ':
+				break;
+				
+				
+				default:
+				goto no_more_affected;
+			}
+
+		no_more_affected:
+		/* If none specified, affect all bits. */
+		if (affected_bits == 0) affected_bits = 07777;
+
+		/* step 2 -- how is it changed? */
+		
+#ifdef DEBUG
+printf("modemuncher step 2 (*p='%c')\n", *p);
+#endif
+
+		switch (*p)
+		{
+			case '+':
+			case '-':
+			case '=':
+			op = *p;
+			break;
+			
+			/* ignore spaces */
+			case ' ':
+			break;
+			
+			default:
+			return -1; /* failed! -- bad operator */
+		}
+		
+		
+		/* step 3 -- what are the changes? */
+		
+#ifdef DEBUG
+printf("modemuncher step 3\n");
+#endif
+
+		for (p++ ; *p!=0 ; p++)
+			switch (*p)
+			{
+				case 'r':
+				ch_mode |= 00444;
+				break;
+				
+				case 'w':
+				ch_mode |= 00222;
+				break;
+				
+				case 'x':
+				ch_mode |= 00111;
+				break;
+				
+				case 's':
+				/* Set the setuid/gid bits if `u' or `g' is selected. */
+				ch_mode |= 06000;
+				break;
+			
+				/* ignore spaces */
+				case ' ':
+				break;
+				
+				default:
+				goto specs_done;
+			}
+
+		specs_done:
+		/* step 4 -- apply the changes */
+
+#ifdef DEBUG
+		printf("modemuncher step 4\n");
+#endif
+		if (*p != ',') doneFlag = 1;
+		if (*p != 0 && *p != ' ' && *p != ',')
+		{
+		
+#ifdef DEBUG
+printf("modemuncher: comma error!\n");
+printf("modemuncher: doneflag = %u\n", doneFlag);
+#endif
+			return -2; /* failed! -- bad mode change */
+		
+		}
+		p++;
+		/*if (!ch_mode) return -2;*/ /* failed! -- bad mode change */
+		if (ch_mode) switch (op)
+		{
+			case '+':
+			*mode = *mode |= ch_mode & affected_bits;
+			break;
+
+			case '-':
+			*mode = *mode &= ~(ch_mode & affected_bits);
+			break;
+
+			case '=':
+			*mode = ch_mode & affected_bits;
+			break;
+		
+			default:
+			return -3; /* failed! -- unknown error */
+		}
+	}
+#ifdef DEBUG
+modechopper(*mode, tmp);
+printf("modemuncher: returning mode = %s\n", tmp);
+#endif
+
+	return 0; /* successful call */
+}
+
+