tmueller@193
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tmueller@193
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/*
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tmueller@193
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** tek.os.posix - tek POSIX library
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tmueller@193
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** Written by Timm S. Mueller <tmueller at neoscientists.org>
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tmueller@193
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** See copyright notice in COPYRIGHT
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tmueller@193
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*/
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tmueller@0
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tmueller@0
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#include <stdlib.h>
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tmueller@0
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#include <string.h>
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tmueller@0
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <math.h>
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#include <time.h>
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#include <lua.h>
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#include <lualib.h>
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tmueller@0
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#include <lauxlib.h>
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tmueller@0
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tmueller@0
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tmueller@0
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#define DIRCLASSNAME "dir*"
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tmueller@0
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tmueller@0
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static void
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setfield(lua_State *L, const char *attr, const char *key, lua_Integer n)
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{
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tmueller@0
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if (attr == NULL || strcmp(attr, key) == 0)
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lua_pushinteger(L, n);
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tmueller@0
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if (attr == NULL)
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lua_setfield(L, -2, key);
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tmueller@0
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}
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tmueller@18
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tmueller@0
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static int
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setstat(lua_State *L, int result, struct stat *s, const char *attr)
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tmueller@0
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{
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tmueller@0
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if (result != 0)
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tmueller@0
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{
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tmueller@0
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lua_pushnil(L);
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tmueller@0
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lua_pushstring(L, strerror(errno));
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tmueller@0
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return 2;
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tmueller@0
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}
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tmueller@0
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tmueller@0
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if (attr == NULL)
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lua_newtable(L);
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setfield(L, attr, "dev", s->st_dev);
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setfield(L, attr, "ino", s->st_ino);
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if (attr == NULL || strcmp(attr, "mode") == 0)
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{
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tmueller@0
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if (S_ISREG(s->st_mode))
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tmueller@0
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lua_pushstring(L, "file");
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else if (S_ISDIR(s->st_mode))
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lua_pushstring(L, "directory");
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else if (S_ISLNK(s->st_mode))
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lua_pushstring(L, "link");
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else if (S_ISSOCK(s->st_mode))
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lua_pushstring(L, "socket");
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else if (S_ISFIFO(s->st_mode))
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lua_pushstring(L, "named pipe");
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else if (S_ISCHR(s->st_mode))
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lua_pushstring(L, "char device");
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else if (S_ISBLK(s->st_mode))
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lua_pushstring(L, "block device");
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else
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lua_pushstring(L, "other");
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if (attr == NULL)
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lua_setfield(L, -2, "mode");
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}
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setfield(L, attr, "nlink", s->st_nlink);
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setfield(L, attr, "uid", s->st_uid);
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setfield(L, attr, "gid", s->st_gid);
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setfield(L, attr, "rdev", s->st_rdev);
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setfield(L, attr, "access", s->st_atime);
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setfield(L, attr, "modifications", s->st_mtime);
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setfield(L, attr, "change", s->st_ctime);
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setfield(L, attr, "size", s->st_size);
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setfield(L, attr, "blocks", s->st_blocks);
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setfield(L, attr, "blksize", s->st_blksize);
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return 1;
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}
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static int
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posix_stat(lua_State *L)
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{
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const char *path = luaL_checkstring(L, 1);
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const char *attr = luaL_optstring(L, 2, NULL);
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struct stat s;
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return setstat(L, stat(path, &s), &s, attr);
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}
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tmueller@0
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static int
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posix_lstat(lua_State *L)
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{
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const char *path = luaL_checkstring(L, 1);
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const char *attr = luaL_optstring(L, 2, NULL);
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struct stat s;
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return setstat(L, lstat(path, &s), &s, attr);
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}
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static int
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posix_opendir(lua_State *L)
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{
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const char *path = luaL_checkstring(L, 1);
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DIR **pdir = lua_newuserdata(L, sizeof(void *));
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*pdir = NULL;
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lua_pushvalue(L, lua_upvalueindex(2)); /* class metatable */
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/* attach metatable to the userdata object */
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lua_setmetatable(L, -2); /* s: udata */
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/* create class instance */
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*pdir = opendir(path);
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if (*pdir == NULL)
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{
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lua_pushnil(L);
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lua_pushstring(L, strerror(errno));
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return 2;
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tmueller@0
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}
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tmueller@0
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return 1;
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tmueller@0
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}
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tmueller@0
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static DIR **
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getinstptr(lua_State *L, int narg, const char *classname)
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{
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DIR **pinst = luaL_checkudata(L, narg, classname);
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if (*pinst) return pinst;
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luaL_argerror(L, narg, "Closed handle");
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return NULL;
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tmueller@0
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}
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tmueller@0
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tmueller@0
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static int
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posix_closedir(lua_State *L)
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{
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DIR **pdir = getinstptr(L, 1, DIRCLASSNAME);
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closedir(*pdir);
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*pdir = NULL;
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tmueller@0
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return 0;
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tmueller@0
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}
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tmueller@0
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static int
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posix_readdir(lua_State *L)
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{
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tmueller@0
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DIR *dir = *getinstptr(L, 1, DIRCLASSNAME);
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tmueller@0
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struct dirent *de = readdir(dir);
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tmueller@0
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if (de)
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tmueller@0
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lua_pushstring(L, de->d_name);
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tmueller@0
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else
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tmueller@0
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lua_pushnil(L);
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tmueller@0
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return 1;
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tmueller@0
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}
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tmueller@0
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tmueller@0
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tmueller@198
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static int
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tmueller@0
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posix_readlink(lua_State *L)
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{
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tmueller@0
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const char *path = luaL_checkstring(L, 1);
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tmueller@0
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char buf[PATH_MAX + 1];
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tmueller@0
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ssize_t len = readlink(path, buf, sizeof(buf) - 1);
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tmueller@0
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if (len < 0)
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tmueller@0
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{
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tmueller@0
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lua_pushnil(L);
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tmueller@0
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lua_pushstring(L, strerror(errno));
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tmueller@0
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return 2;
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tmueller@0
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}
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tmueller@0
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buf[len] = 0;
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tmueller@0
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lua_pushstring(L, buf);
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tmueller@0
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return 1;
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tmueller@0
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}
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tmueller@0
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tmueller@0
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tmueller@198
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static int
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tmueller@0
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posix_mkdir(lua_State *L)
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tmueller@0
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{
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tmueller@0
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const char *path = luaL_checkstring(L, 1);
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tmueller@0
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184 |
if (mkdir(path, 0775) == 0)
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tmueller@0
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{
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tmueller@0
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lua_pushboolean(L, 1);
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tmueller@0
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return 1;
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tmueller@0
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188 |
}
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tmueller@0
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lua_pushnil(L);
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tmueller@0
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lua_pushstring(L, strerror(errno));
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tmueller@0
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return 2;
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tmueller@0
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192 |
}
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tmueller@0
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193 |
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tmueller@0
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194 |
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tmueller@198
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195 |
static int
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tmueller@0
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posix_symlink(lua_State *L)
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tmueller@0
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{
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tmueller@0
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const char *oldpath = luaL_checkstring(L, 1);
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tmueller@0
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const char *newpath = luaL_checkstring(L, 2);
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tmueller@0
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200 |
if (symlink(oldpath, newpath) == 0)
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tmueller@0
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201 |
{
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tmueller@0
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202 |
lua_pushboolean(L, 1);
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tmueller@0
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203 |
return 1;
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tmueller@0
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204 |
}
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tmueller@0
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205 |
lua_pushnil(L);
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tmueller@0
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206 |
lua_pushstring(L, strerror(errno));
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tmueller@0
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207 |
return 2;
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tmueller@0
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208 |
}
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tmueller@0
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209 |
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tmueller@0
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210 |
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tmueller@0
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211 |
static int
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tmueller@0
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212 |
resolvepath(const char *src, char *dest)
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tmueller@0
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213 |
{
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tmueller@0
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214 |
int len = strlen(src);
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tmueller@0
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215 |
const char *sp = src + len;
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tmueller@0
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216 |
char *dp = dest;
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tmueller@0
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217 |
int dc = 0, slc = 0, eac = 0, wc = 0;
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tmueller@0
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218 |
int i, c;
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tmueller@198
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219 |
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tmueller@198
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220 |
while (len--)
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tmueller@0
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221 |
{
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tmueller@0
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222 |
c = *(--sp);
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tmueller@0
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223 |
switch (c)
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tmueller@0
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224 |
{
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tmueller@0
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225 |
case '/':
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tmueller@0
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226 |
if (dc == 2)
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tmueller@0
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227 |
eac++;
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tmueller@0
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228 |
dc = 0;
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tmueller@0
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229 |
slc = 1;
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tmueller@0
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230 |
wc = 0;
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tmueller@0
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231 |
break;
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tmueller@0
|
232 |
|
tmueller@0
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233 |
case '.':
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tmueller@0
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234 |
if (slc)
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tmueller@0
|
235 |
{
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tmueller@0
|
236 |
dc++;
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tmueller@0
|
237 |
break;
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tmueller@0
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238 |
}
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tmueller@0
|
239 |
/* fallthru: */
|
tmueller@0
|
240 |
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tmueller@0
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241 |
default:
|
tmueller@0
|
242 |
if (wc)
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tmueller@0
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243 |
break;
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tmueller@198
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244 |
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tmueller@0
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245 |
if (slc)
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tmueller@0
|
246 |
{
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tmueller@0
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247 |
slc = 0;
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tmueller@198
|
248 |
|
tmueller@0
|
249 |
if (eac > 0)
|
tmueller@0
|
250 |
{
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tmueller@0
|
251 |
/* resolve one eatcount */
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tmueller@0
|
252 |
eac--;
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tmueller@0
|
253 |
/* now wait for next path part */
|
tmueller@0
|
254 |
wc = 1;
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tmueller@0
|
255 |
break;
|
tmueller@0
|
256 |
}
|
tmueller@198
|
257 |
|
tmueller@0
|
258 |
*dp++ = '/';
|
tmueller@0
|
259 |
}
|
tmueller@198
|
260 |
|
tmueller@0
|
261 |
while (dc == 2 || dc == 1)
|
tmueller@0
|
262 |
{
|
tmueller@0
|
263 |
*dp++ = '.';
|
tmueller@0
|
264 |
dc--;
|
tmueller@0
|
265 |
}
|
tmueller@0
|
266 |
dc = 0;
|
tmueller@198
|
267 |
|
tmueller@0
|
268 |
*dp++ = c;
|
tmueller@0
|
269 |
break;
|
tmueller@0
|
270 |
}
|
tmueller@0
|
271 |
}
|
tmueller@198
|
272 |
|
tmueller@0
|
273 |
/* unresolved eatcount */
|
tmueller@0
|
274 |
if (eac)
|
tmueller@0
|
275 |
return 0;
|
tmueller@198
|
276 |
|
tmueller@0
|
277 |
/* resolve remaining slash */
|
tmueller@0
|
278 |
if (slc)
|
tmueller@0
|
279 |
*dp++ = '/';
|
tmueller@198
|
280 |
|
tmueller@0
|
281 |
*dp = 0;
|
tmueller@198
|
282 |
|
tmueller@0
|
283 |
len = dp - dest;
|
tmueller@0
|
284 |
for (i = 0; i < len / 2; ++i)
|
tmueller@0
|
285 |
{
|
tmueller@0
|
286 |
char t = dest[i];
|
tmueller@198
|
287 |
dest[i] = dest[len - i - 1];
|
tmueller@0
|
288 |
dest[len - i - 1] = t;
|
tmueller@0
|
289 |
}
|
tmueller@0
|
290 |
|
tmueller@0
|
291 |
return 1;
|
tmueller@0
|
292 |
}
|
tmueller@0
|
293 |
|
tmueller@0
|
294 |
|
tmueller@198
|
295 |
static int
|
tmueller@0
|
296 |
posix_abspath(lua_State *L)
|
tmueller@0
|
297 |
{
|
tmueller@0
|
298 |
const char *path = luaL_checkstring(L, 1);
|
tmueller@0
|
299 |
char *pwd = NULL;
|
tmueller@0
|
300 |
size_t pwdsize = 16;
|
tmueller@198
|
301 |
size_t len1, len2;
|
tmueller@198
|
302 |
char *srcpath, *dstpath;
|
tmueller@198
|
303 |
|
tmueller@0
|
304 |
for (;;)
|
tmueller@0
|
305 |
{
|
tmueller@198
|
306 |
if (path[0] == '/')
|
tmueller@0
|
307 |
{
|
tmueller@198
|
308 |
pwd = malloc(2);
|
tmueller@198
|
309 |
if (pwd == NULL)
|
tmueller@198
|
310 |
break;
|
tmueller@198
|
311 |
pwd[0] = '/';
|
tmueller@198
|
312 |
pwd[1] = 0;
|
tmueller@198
|
313 |
}
|
tmueller@198
|
314 |
else
|
tmueller@198
|
315 |
{
|
tmueller@198
|
316 |
char *newpwd = realloc(pwd, pwdsize);
|
tmueller@198
|
317 |
if (newpwd == NULL)
|
tmueller@198
|
318 |
break;
|
tmueller@198
|
319 |
pwd = newpwd;
|
tmueller@198
|
320 |
|
tmueller@198
|
321 |
if (!getcwd(pwd, pwdsize))
|
tmueller@0
|
322 |
{
|
tmueller@198
|
323 |
if (errno == ERANGE)
|
tmueller@0
|
324 |
{
|
tmueller@198
|
325 |
pwdsize <<= 1;
|
tmueller@198
|
326 |
continue;
|
tmueller@0
|
327 |
}
|
tmueller@0
|
328 |
lua_pushnil(L);
|
tmueller@198
|
329 |
lua_pushstring(L, strerror(errno));
|
tmueller@0
|
330 |
return 2;
|
tmueller@0
|
331 |
}
|
tmueller@198
|
332 |
}
|
tmueller@198
|
333 |
|
tmueller@198
|
334 |
len1 = strlen(pwd);
|
tmueller@198
|
335 |
len2 = strlen(path);
|
tmueller@198
|
336 |
srcpath = malloc(len1 + 1 + len2 + 1);
|
tmueller@198
|
337 |
dstpath = malloc(len1 + 1 + len2 + 1);
|
tmueller@198
|
338 |
|
tmueller@198
|
339 |
if (srcpath && dstpath)
|
tmueller@198
|
340 |
{
|
tmueller@198
|
341 |
int res;
|
tmueller@198
|
342 |
|
tmueller@198
|
343 |
strcpy(srcpath, pwd);
|
tmueller@198
|
344 |
free(pwd);
|
tmueller@198
|
345 |
srcpath[len1] = '/';
|
tmueller@198
|
346 |
strcpy(srcpath + len1 + 1, path);
|
tmueller@198
|
347 |
res = resolvepath(srcpath, dstpath);
|
tmueller@0
|
348 |
free(srcpath);
|
tmueller@198
|
349 |
|
tmueller@198
|
350 |
if (res)
|
tmueller@198
|
351 |
{
|
tmueller@198
|
352 |
lua_pushstring(L, dstpath);
|
tmueller@198
|
353 |
free(dstpath);
|
tmueller@198
|
354 |
return 1;
|
tmueller@198
|
355 |
}
|
tmueller@198
|
356 |
|
tmueller@0
|
357 |
free(dstpath);
|
tmueller@198
|
358 |
lua_pushnil(L);
|
tmueller@198
|
359 |
lua_pushstring(L, "Not a valid path");
|
tmueller@198
|
360 |
return 2;
|
tmueller@0
|
361 |
}
|
tmueller@198
|
362 |
|
tmueller@198
|
363 |
free(srcpath);
|
tmueller@198
|
364 |
free(dstpath);
|
tmueller@198
|
365 |
break;
|
tmueller@0
|
366 |
}
|
tmueller@198
|
367 |
|
tmueller@0
|
368 |
free(pwd);
|
tmueller@0
|
369 |
luaL_error(L, "Out of memory");
|
tmueller@0
|
370 |
return 0;
|
tmueller@0
|
371 |
}
|
tmueller@0
|
372 |
|
tmueller@0
|
373 |
|
tmueller@198
|
374 |
static int
|
tmueller@172
|
375 |
posix_nanosleep(lua_State *L)
|
tmueller@172
|
376 |
{
|
tmueller@172
|
377 |
struct timespec req;
|
tmueller@172
|
378 |
lua_Number d = luaL_checknumber(L, 1);
|
tmueller@198
|
379 |
|
tmueller@172
|
380 |
req.tv_sec = (time_t) d;
|
tmueller@172
|
381 |
req.tv_nsec = (long) ((d - req.tv_sec) * 1000000000);
|
tmueller@198
|
382 |
|
tmueller@172
|
383 |
if (nanosleep(&req, NULL) == 0)
|
tmueller@172
|
384 |
{
|
tmueller@172
|
385 |
lua_pushboolean(L, 1);
|
tmueller@172
|
386 |
return 1;
|
tmueller@172
|
387 |
}
|
tmueller@198
|
388 |
|
tmueller@172
|
389 |
lua_pushnil(L);
|
tmueller@172
|
390 |
lua_pushstring(L, strerror(errno));
|
tmueller@172
|
391 |
return 2;
|
tmueller@172
|
392 |
}
|
tmueller@172
|
393 |
|
tmueller@172
|
394 |
|
tmueller@0
|
395 |
static const luaL_Reg lib[] =
|
tmueller@0
|
396 |
{
|
tmueller@0
|
397 |
{ "stat", posix_stat },
|
tmueller@0
|
398 |
{ "lstat", posix_lstat },
|
tmueller@0
|
399 |
{ "opendir", posix_opendir },
|
tmueller@0
|
400 |
{ "closedir", posix_closedir },
|
tmueller@0
|
401 |
{ "readdir", posix_readdir },
|
tmueller@0
|
402 |
{ "mkdir", posix_mkdir },
|
tmueller@0
|
403 |
{ "readlink", posix_readlink },
|
tmueller@0
|
404 |
{ "symlink", posix_symlink },
|
tmueller@0
|
405 |
{ "abspath", posix_abspath },
|
tmueller@172
|
406 |
{ "nanosleep", posix_nanosleep },
|
tmueller@0
|
407 |
{ NULL, NULL }
|
tmueller@0
|
408 |
};
|
tmueller@0
|
409 |
|
tmueller@0
|
410 |
|
tmueller@0
|
411 |
static const luaL_Reg methods[] =
|
tmueller@0
|
412 |
{
|
tmueller@0
|
413 |
{"read", posix_readdir },
|
tmueller@0
|
414 |
{"close", posix_closedir },
|
tmueller@0
|
415 |
{"__gc", posix_closedir },
|
tmueller@0
|
416 |
{NULL, NULL}
|
tmueller@0
|
417 |
};
|
tmueller@0
|
418 |
|
tmueller@0
|
419 |
|
tmueller@0
|
420 |
static void
|
tmueller@0
|
421 |
addclass(lua_State *L, const char *libname, const char *classname,
|
tmueller@241
|
422 |
const luaL_Reg *functions, const luaL_Reg *methods, void *userdata)
|
tmueller@0
|
423 |
{
|
tmueller@18
|
424 |
luaL_newmetatable(L, classname); /* classtab */
|
tmueller@18
|
425 |
lua_pushliteral(L, "__index"); /* classtab, "__index" */
|
tmueller@0
|
426 |
|
tmueller@0
|
427 |
/* insert self: classtab.__index = classtab */
|
tmueller@18
|
428 |
lua_pushvalue(L, -2); /* classtab, "__index", classtab */
|
tmueller@18
|
429 |
lua_rawset(L, -3); /* classtab */
|
tmueller@0
|
430 |
|
tmueller@0
|
431 |
/* insert methods. consume 1 userdata. do not create a new tab */
|
tmueller@18
|
432 |
lua_pushlightuserdata(L, userdata); /* classtab, userdata */
|
tmueller@18
|
433 |
luaL_openlib(L, NULL, methods, 1); /* classtab */
|
tmueller@0
|
434 |
|
tmueller@0
|
435 |
/* first upvalue: userdata */
|
tmueller@18
|
436 |
lua_pushlightuserdata(L, userdata); /* classtab, userdata */
|
tmueller@0
|
437 |
|
tmueller@0
|
438 |
/* duplicate table argument to be used as second upvalue for cclosure */
|
tmueller@18
|
439 |
lua_pushvalue(L, -2); /* classtab, userdata, classtab */
|
tmueller@0
|
440 |
|
tmueller@0
|
441 |
/* insert functions */
|
tmueller@0
|
442 |
luaL_openlib(L, libname, functions, 2); /* classtab, libtab */
|
tmueller@0
|
443 |
|
tmueller@18
|
444 |
/* adjust stack */
|
tmueller@198
|
445 |
lua_pop(L, 2);
|
tmueller@0
|
446 |
}
|
tmueller@0
|
447 |
|
tmueller@0
|
448 |
|
tmueller@188
|
449 |
int luaopen_tek_os_posix(lua_State *L)
|
tmueller@0
|
450 |
{
|
tmueller@241
|
451 |
addclass(L, "tek.os.posix", DIRCLASSNAME, lib, methods, NULL);
|
tmueller@0
|
452 |
return 0;
|
tmueller@0
|
453 |
}
|