mirror of
https://github.com/lua/lua
synced 2024-12-15 07:12:40 +03:00
607 lines
15 KiB
C
607 lines
15 KiB
C
/*
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** $Id: liolib.c,v 2.4 2002/05/02 17:12:27 roberto Exp roberto $
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** Standard I/O (and system) library
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** See Copyright Notice in lua.h
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*/
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#include <errno.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "lua.h"
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#include "lauxlib.h"
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#include "luadebug.h"
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#include "lualib.h"
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/*
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** {======================================================
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** FILE Operations
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** =======================================================
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*/
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#ifndef POPEN
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#define pclose(f) (-1)
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#endif
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#define FILEHANDLE "FileHandle"
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#define CLOSEDFILEHANDLE "ClosedFileHandle"
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#define IO_INPUT "_input"
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#define IO_OUTPUT "_output"
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static int pushresult (lua_State *L, int i) {
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if (i) {
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lua_pushboolean(L, 1);
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return 1;
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}
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else {
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lua_pushnil(L);
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lua_pushstring(L, strerror(errno));
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lua_pushnumber(L, errno);
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return 3;
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}
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}
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static FILE *tofile (lua_State *L, int findex) {
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FILE **f = (FILE **)lua_touserdata(L, findex);
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if (f && lua_getmetatable(L, findex) &&
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lua_equal(L, -1, lua_upvalueindex(1))) {
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lua_pop(L, 1);
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return *f;
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}
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luaL_argerror(L, findex, "bad file");
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return NULL; /* to avoid warnings */
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}
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static void newfile (lua_State *L, FILE *f) {
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lua_newpointerbox(L, f);
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lua_pushliteral(L, FILEHANDLE);
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lua_rawget(L, LUA_REGISTRYINDEX);
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lua_setmetatable(L, -2);
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}
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static void registerfile (lua_State *L, FILE *f, const char *name,
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const char *impname) {
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lua_pushstring(L, name);
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newfile(L, f);
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if (impname) {
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lua_pushstring(L, impname);
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lua_pushvalue(L, -2);
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lua_settable(L, -6);
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}
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lua_settable(L, -3);
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}
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static int setnewfile (lua_State *L, FILE *f) {
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if (f == NULL)
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return pushresult(L, 0);
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else {
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newfile(L, f);
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return 1;
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}
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}
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static int io_close (lua_State *L) {
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FILE *f = tofile(L, 1);
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int status = 1;
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if (f != stdin && f != stdout && f != stderr) {
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lua_settop(L, 1); /* make sure file is on top */
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lua_pushliteral(L, CLOSEDFILEHANDLE);
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lua_rawget(L, LUA_REGISTRYINDEX);
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lua_setmetatable(L, 1);
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status = (pclose(f) != -1) || (fclose(f) == 0);
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}
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return pushresult(L, status);
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}
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static int io_open (lua_State *L) {
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FILE *f = fopen(luaL_check_string(L, 1), luaL_opt_string(L, 2, "r"));
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return setnewfile(L, f);
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}
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static int io_popen (lua_State *L) {
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#ifndef POPEN
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luaL_verror(L, "`popen' not supported");
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return 0;
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#else
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FILE *f = popen(luaL_check_string(L, 1), luaL_opt_string(L, 2, "r"));
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return setnewfile(L, f);
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#endif
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}
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static int io_tmpfile (lua_State *L) {
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return setnewfile(L, tmpfile());
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}
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static FILE *getiofile (lua_State *L, const char *name) {
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lua_pushstring(L, name);
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lua_rawget(L, lua_upvalueindex(1));
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return tofile(L, -1);
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}
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static int g_iofile (lua_State *L, const char *name, const char *mode) {
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if (lua_isnone(L, 1)) {
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lua_pushstring(L, name);
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lua_rawget(L, lua_upvalueindex(1));
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return 1;
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}
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else {
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const char *filename = lua_tostring(L, 1);
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lua_pushstring(L, name);
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if (filename) {
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FILE *f = fopen(filename, mode);
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luaL_arg_check(L, f, 1, strerror(errno));
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newfile(L, f);
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}
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else {
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lua_pushvalue(L, 1);
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tofile(L, -1); /* check that it's a valid file handle */
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}
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lua_rawset(L, lua_upvalueindex(1));
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return 0;
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}
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}
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static int io_input (lua_State *L) {
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return g_iofile(L, IO_INPUT, "r");
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}
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static int io_output (lua_State *L) {
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return g_iofile(L, IO_OUTPUT, "w");
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}
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/*
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** {======================================================
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** READ
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** =======================================================
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*/
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static int read_number (lua_State *L, FILE *f) {
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lua_Number d;
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if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
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lua_pushnumber(L, d);
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return 1;
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}
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else return 0; /* read fails */
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}
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static int test_eof (lua_State *L, FILE *f) {
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int c = getc(f);
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ungetc(c, f);
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lua_pushlstring(L, NULL, 0);
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return (c != EOF);
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}
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static int read_line (lua_State *L, FILE *f) {
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luaL_Buffer b;
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luaL_buffinit(L, &b);
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for (;;) {
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size_t l;
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char *p = luaL_prepbuffer(&b);
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if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
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luaL_pushresult(&b); /* close buffer */
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return (lua_strlen(L, -1) > 0); /* check whether read something */
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}
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l = strlen(p);
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if (p[l-1] != '\n')
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luaL_addsize(&b, l);
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else {
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luaL_addsize(&b, l - 1); /* do not include `eol' */
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luaL_pushresult(&b); /* close buffer */
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return 1; /* read at least an `eol' */
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}
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}
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}
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static int read_chars (lua_State *L, FILE *f, size_t n) {
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size_t rlen; /* how much to read */
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size_t nr; /* number of chars actually read */
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luaL_Buffer b;
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luaL_buffinit(L, &b);
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rlen = LUAL_BUFFERSIZE; /* try to read that much each time */
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do {
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char *p = luaL_prepbuffer(&b);
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if (rlen > n) rlen = n; /* cannot read more than asked */
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nr = fread(p, sizeof(char), rlen, f);
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luaL_addsize(&b, nr);
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n -= nr; /* still have to read `n' chars */
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} while (n > 0 && nr == rlen); /* until end of count or eof */
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luaL_pushresult(&b); /* close buffer */
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return (n == 0 || lua_strlen(L, -1) > 0);
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}
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static int g_read (lua_State *L, FILE *f, int first) {
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int nargs = lua_gettop(L) - 1;
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int success;
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int n;
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if (nargs == 0) { /* no arguments? */
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success = read_line(L, f);
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n = first+1; /* to return 1 result */
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}
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else { /* ensure stack space for all results and for auxlib's buffer */
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luaL_check_stack(L, nargs+LUA_MINSTACK, "too many arguments");
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success = 1;
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for (n = first; nargs-- && success; n++) {
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if (lua_type(L, n) == LUA_TNUMBER) {
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size_t l = (size_t)lua_tonumber(L, n);
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success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
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}
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else {
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const char *p = lua_tostring(L, n);
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if (!p || p[0] != '*')
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return luaL_verror(L, "invalid `read' option");
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switch (p[1]) {
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case 'n': /* number */
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success = read_number(L, f);
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break;
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case 'l': /* line */
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success = read_line(L, f);
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break;
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case 'a': /* file */
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read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */
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success = 1; /* always success */
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break;
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case 'w': /* word */
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return luaL_verror(L, "obsolete option `*w'");
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break;
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default:
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return luaL_argerror(L, n, "invalid format");
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}
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}
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}
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}
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if (!success) {
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lua_pop(L, 1); /* remove last result */
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lua_pushnil(L); /* push nil instead */
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}
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return n - first;
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}
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static int io_read (lua_State *L) {
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return g_read(L, getiofile(L, IO_INPUT), 1);
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}
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static int f_read (lua_State *L) {
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return g_read(L, tofile(L, 1), 2);
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}
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/* }====================================================== */
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static int g_write (lua_State *L, FILE *f, int arg) {
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int nargs = lua_gettop(L) - 1;
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int status = 1;
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for (; nargs--; arg++) {
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if (lua_type(L, arg) == LUA_TNUMBER) {
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/* optimization: could be done exactly as for strings */
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status = status &&
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fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
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}
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else {
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size_t l;
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const char *s = luaL_check_lstr(L, arg, &l);
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status = status && (fwrite(s, sizeof(char), l, f) == l);
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}
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}
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pushresult(L, status);
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return 1;
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}
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static int io_write (lua_State *L) {
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return g_write(L, getiofile(L, IO_OUTPUT), 1);
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}
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static int f_write (lua_State *L) {
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return g_write(L, tofile(L, 1), 2);
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}
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static int f_seek (lua_State *L) {
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static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
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static const char *const modenames[] = {"set", "cur", "end", NULL};
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FILE *f = tofile(L, 1);
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int op = luaL_findstring(luaL_opt_string(L, 2, "cur"), modenames);
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long offset = luaL_opt_long(L, 3, 0);
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luaL_arg_check(L, op != -1, 2, "invalid mode");
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op = fseek(f, offset, mode[op]);
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if (op)
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return pushresult(L, 0); /* error */
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else {
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lua_pushnumber(L, ftell(f));
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return 1;
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}
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}
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static int io_flush (lua_State *L) {
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return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0);
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}
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static int f_flush (lua_State *L) {
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return pushresult(L, fflush(tofile(L, 1)) == 0);
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}
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static const luaL_reg iolib[] = {
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{"input", io_input},
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{"output", io_output},
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{"close", io_close},
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{"flush", io_flush},
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{"open", io_open},
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{"popen", io_popen},
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{"read", io_read},
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{"tmpfile", io_tmpfile},
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{"write", io_write},
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{NULL, NULL}
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};
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static const luaL_reg flib[] = {
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{"flush", f_flush},
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{"read", f_read},
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{"seek", f_seek},
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{"write", f_write},
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{NULL, NULL}
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};
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static void createmeta (lua_State *L) {
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lua_pushliteral(L, FILEHANDLE); /* S: FH */
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lua_newtable(L); /* S: mt FH */
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/* close files when collected */
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lua_pushliteral(L, "__gc"); /* S: `gc' mt FH */
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lua_pushvalue(L, -2); /* S: mt `gc' mt FH */
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lua_pushcclosure(L, io_close, 1); /* S: close `gc' mt FH */
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lua_rawset(L, -3); /* S: mt FH */
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/* file methods */
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lua_pushliteral(L, "__gettable"); /* S: `gettable' mt FH */
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lua_pushvalue(L, -2); /* S: mt `gettable' mt FH */
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lua_rawset(L, -3); /* S: mt FH */
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lua_pushvalue(L, -1); /* S: mt mt FH */
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luaL_openlib(L, flib, 1); /* S: mt FH */
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/* put new metatable into registry */
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lua_rawset(L, LUA_REGISTRYINDEX); /* S: empty */
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/* meta table for CLOSEDFILEHANDLE */
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lua_pushliteral(L, CLOSEDFILEHANDLE);
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lua_newtable(L);
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lua_rawset(L, LUA_REGISTRYINDEX);
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}
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/* }====================================================== */
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/*
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** {======================================================
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** Other O.S. Operations
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** =======================================================
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*/
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static int io_execute (lua_State *L) {
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lua_pushnumber(L, system(luaL_check_string(L, 1)));
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return 1;
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}
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static int io_remove (lua_State *L) {
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return pushresult(L, remove(luaL_check_string(L, 1)) == 0);
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}
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static int io_rename (lua_State *L) {
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return pushresult(L, rename(luaL_check_string(L, 1),
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luaL_check_string(L, 2)) == 0);
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}
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static int io_tmpname (lua_State *L) {
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char buff[L_tmpnam];
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if (tmpnam(buff) != buff)
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return luaL_verror(L, "unable to generate a unique filename");
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lua_pushstring(L, buff);
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return 1;
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}
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static int io_getenv (lua_State *L) {
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lua_pushstring(L, getenv(luaL_check_string(L, 1))); /* if NULL push nil */
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return 1;
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}
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static int io_clock (lua_State *L) {
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lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
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return 1;
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}
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/*
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** {======================================================
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** Time/Date operations
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** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
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** wday=%w+1, yday=%j, isdst=? }
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** =======================================================
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*/
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static void setfield (lua_State *L, const char *key, int value) {
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lua_pushstring(L, key);
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lua_pushnumber(L, value);
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lua_rawset(L, -3);
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}
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static int getfield (lua_State *L, const char *key, int d) {
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int res;
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lua_pushstring(L, key);
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lua_gettable(L, -2);
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if (lua_isnumber(L, -1))
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res = (int)(lua_tonumber(L, -1));
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else {
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if (d == -2)
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return luaL_verror(L, "field `%s' missing in date table", key);
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res = d;
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}
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lua_pop(L, 1);
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return res;
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}
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static int io_date (lua_State *L) {
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const char *s = luaL_opt_string(L, 1, "%c");
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time_t t = (time_t)(luaL_opt_number(L, 2, -1));
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struct tm *stm;
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if (t == (time_t)(-1)) /* no time given? */
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t = time(NULL); /* use current time */
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if (*s == '!') { /* UTC? */
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stm = gmtime(&t);
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s++; /* skip `!' */
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}
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else
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stm = localtime(&t);
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if (stm == NULL) /* invalid date? */
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lua_pushnil(L);
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else if (strcmp(s, "*t") == 0) {
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lua_newtable(L);
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setfield(L, "sec", stm->tm_sec);
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setfield(L, "min", stm->tm_min);
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setfield(L, "hour", stm->tm_hour);
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setfield(L, "day", stm->tm_mday);
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setfield(L, "month", stm->tm_mon+1);
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setfield(L, "year", stm->tm_year+1900);
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setfield(L, "wday", stm->tm_wday+1);
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setfield(L, "yday", stm->tm_yday+1);
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setfield(L, "isdst", stm->tm_isdst);
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}
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else {
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char b[256];
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if (strftime(b, sizeof(b), s, stm))
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lua_pushstring(L, b);
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else
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return luaL_verror(L, "invalid `date' format");
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}
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return 1;
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}
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static int io_time (lua_State *L) {
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if (lua_isnoneornil(L, 1)) /* called without args? */
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lua_pushnumber(L, time(NULL)); /* return current time */
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else {
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time_t t;
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struct tm ts;
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luaL_check_type(L, 1, LUA_TTABLE);
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lua_settop(L, 1); /* make sure table is at the top */
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ts.tm_sec = getfield(L, "sec", 0);
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ts.tm_min = getfield(L, "min", 0);
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ts.tm_hour = getfield(L, "hour", 12);
|
|
ts.tm_mday = getfield(L, "day", -2);
|
|
ts.tm_mon = getfield(L, "month", -2)-1;
|
|
ts.tm_year = getfield(L, "year", -2)-1900;
|
|
ts.tm_isdst = getfield(L, "isdst", -1);
|
|
t = mktime(&ts);
|
|
if (t == (time_t)(-1))
|
|
lua_pushnil(L);
|
|
else
|
|
lua_pushnumber(L, t);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_difftime (lua_State *L) {
|
|
lua_pushnumber(L, difftime((time_t)(luaL_check_number(L, 1)),
|
|
(time_t)(luaL_opt_number(L, 2, 0))));
|
|
return 1;
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
static int io_setloc (lua_State *L) {
|
|
static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
|
|
LC_NUMERIC, LC_TIME};
|
|
static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
|
|
"numeric", "time", NULL};
|
|
const char *l = lua_tostring(L, 1);
|
|
int op = luaL_findstring(luaL_opt_string(L, 2, "all"), catnames);
|
|
luaL_arg_check(L, l || lua_isnoneornil(L, 1), 1, "string expected");
|
|
luaL_arg_check(L, op != -1, 2, "invalid option");
|
|
lua_pushstring(L, setlocale(cat[op], l));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_exit (lua_State *L) {
|
|
exit(luaL_opt_int(L, 1, EXIT_SUCCESS));
|
|
return 0; /* to avoid warnings */
|
|
}
|
|
|
|
static const luaL_reg syslib[] = {
|
|
{"clock", io_clock},
|
|
{"date", io_date},
|
|
{"difftime", io_difftime},
|
|
{"execute", io_execute},
|
|
{"exit", io_exit},
|
|
{"getenv", io_getenv},
|
|
{"remove", io_remove},
|
|
{"rename", io_rename},
|
|
{"setlocale", io_setloc},
|
|
{"time", io_time},
|
|
{"tmpname", io_tmpname},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
LUALIB_API int lua_iolibopen (lua_State *L) {
|
|
createmeta(L);
|
|
luaL_opennamedlib(L, "os", syslib, 0);
|
|
lua_pushliteral(L, FILEHANDLE); /* S: FH */
|
|
lua_rawget(L, LUA_REGISTRYINDEX); /* S: mt */
|
|
lua_pushvalue(L, -1); /* S: mt mt */
|
|
luaL_opennamedlib(L, "io", iolib, 1); /* S: mt */
|
|
lua_pushliteral(L, "io"); /* S: `io' mt */
|
|
lua_gettable(L, LUA_GLOBALSINDEX); /* S: io mt */
|
|
/* put predefined file handles into `io' table */
|
|
registerfile(L, stdin, "stdin", IO_INPUT);
|
|
registerfile(L, stdout, "stdout", IO_OUTPUT);
|
|
registerfile(L, stderr, "stderr", NULL);
|
|
lua_pop(L, 2); /* S: empty */
|
|
return 0;
|
|
}
|
|
|