557 lines
13 KiB
C
557 lines
13 KiB
C
/*
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** $Id: liolib.c 11549 2011-04-01 10:35:32Z miros $
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define liolib_c
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#define LUA_LIB
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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#define IO_INPUT 1
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#define IO_OUTPUT 2
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static const char *const fnames[] = {"input", "output"};
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static int pushresult (lua_State *L, int i, const char *filename) {
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int en = errno; /* calls to Lua API may change this value */
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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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if (filename)
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lua_pushfstring(L, "%s: %s", filename, strerror(en));
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else
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lua_pushfstring(L, "%s", strerror(en));
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lua_pushinteger(L, en);
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return 3;
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}
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}
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static void fileerror (lua_State *L, int arg, const char *filename) {
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lua_pushfstring(L, "%s: %s", filename, strerror(errno));
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luaL_argerror(L, arg, lua_tostring(L, -1));
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}
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#define tofilep(L) ((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
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static int io_type (lua_State *L) {
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void *ud;
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luaL_checkany(L, 1);
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ud = lua_touserdata(L, 1);
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lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
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if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
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lua_pushnil(L); /* not a file */
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else if (*((FILE **)ud) == NULL)
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lua_pushliteral(L, "closed file");
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else
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lua_pushliteral(L, "file");
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return 1;
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}
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static FILE *tofile (lua_State *L) {
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FILE **f = tofilep(L);
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if (*f == NULL)
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luaL_error(L, "attempt to use a closed file");
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return *f;
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}
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/*
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** When creating file handles, always creates a `closed' file handle
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** before opening the actual file; so, if there is a memory error, the
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** file is not left opened.
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*/
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static FILE **newfile (lua_State *L) {
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FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
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*pf = NULL; /* file handle is currently `closed' */
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luaL_getmetatable(L, LUA_FILEHANDLE);
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lua_setmetatable(L, -2);
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return pf;
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}
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/*
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** function to (not) close the standard files stdin, stdout, and stderr
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*/
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static int io_noclose (lua_State *L) {
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lua_pushnil(L);
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lua_pushliteral(L, "cannot close standard file");
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return 2;
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}
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/*
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** function to close 'popen' files
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*/
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static int io_pclose (lua_State *L) {
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FILE **p = tofilep(L);
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int ok = lua_pclose(L, *p);
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*p = NULL;
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return pushresult(L, ok, NULL);
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}
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/*
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** function to close regular files
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*/
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static int io_fclose (lua_State *L) {
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FILE **p = tofilep(L);
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int ok = (fclose(*p) == 0);
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*p = NULL;
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return pushresult(L, ok, NULL);
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}
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static int aux_close (lua_State *L) {
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lua_getfenv(L, 1);
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lua_getfield(L, -1, "__close");
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return (lua_tocfunction(L, -1))(L);
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}
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static int io_close (lua_State *L) {
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if (lua_isnone(L, 1))
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lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
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tofile(L); /* make sure argument is a file */
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return aux_close(L);
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}
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static int io_gc (lua_State *L) {
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FILE *f = *tofilep(L);
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/* ignore closed files */
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if (f != NULL)
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aux_close(L);
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return 0;
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}
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static int io_tostring (lua_State *L) {
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FILE *f = *tofilep(L);
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if (f == NULL)
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lua_pushliteral(L, "file (closed)");
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else
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lua_pushfstring(L, "file (%p)", f);
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return 1;
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}
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static int io_open (lua_State *L) {
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const char *filename = luaL_checkstring(L, 1);
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const char *mode = luaL_optstring(L, 2, "r");
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FILE **pf = newfile(L);
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*pf = fopen(filename, mode);
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return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
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}
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/*
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** this function has a separated environment, which defines the
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** correct __close for 'popen' files
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*/
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static int io_popen (lua_State *L) {
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const char *filename = luaL_checkstring(L, 1);
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const char *mode = luaL_optstring(L, 2, "r");
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FILE **pf = newfile(L);
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*pf = lua_popen(L, filename, mode);
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return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
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}
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static int io_tmpfile (lua_State *L) {
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FILE **pf = newfile(L);
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*pf = tmpfile();
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return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
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}
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static FILE *getiofile (lua_State *L, int findex) {
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FILE *f;
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lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
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f = *(FILE **)lua_touserdata(L, -1);
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if (f == NULL)
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luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
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return f;
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}
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static int g_iofile (lua_State *L, int f, const char *mode) {
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if (!lua_isnoneornil(L, 1)) {
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const char *filename = lua_tostring(L, 1);
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if (filename) {
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FILE **pf = newfile(L);
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*pf = fopen(filename, mode);
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if (*pf == NULL)
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fileerror(L, 1, filename);
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}
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else {
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tofile(L); /* check that it's a valid file handle */
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lua_pushvalue(L, 1);
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}
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lua_rawseti(L, LUA_ENVIRONINDEX, f);
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}
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/* return current value */
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lua_rawgeti(L, LUA_ENVIRONINDEX, f);
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return 1;
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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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static int io_readline (lua_State *L);
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static void aux_lines (lua_State *L, int idx, int toclose) {
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lua_pushvalue(L, idx);
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lua_pushboolean(L, toclose); /* close/not close file when finished */
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lua_pushcclosure(L, io_readline, 2);
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}
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static int f_lines (lua_State *L) {
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tofile(L); /* check that it's a valid file handle */
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aux_lines(L, 1, 0);
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return 1;
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}
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static int io_lines (lua_State *L) {
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if (lua_isnoneornil(L, 1)) { /* no arguments? */
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/* will iterate over default input */
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lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
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return f_lines(L);
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}
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else {
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const char *filename = luaL_checkstring(L, 1);
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FILE **pf = newfile(L);
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*pf = fopen(filename, "r");
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if (*pf == NULL)
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fileerror(L, 1, filename);
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aux_lines(L, lua_gettop(L), 1);
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return 1;
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}
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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 {
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lua_pushnil(L); /* "result" to be removed */
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return 0; /* read fails */
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}
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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_objlen(L, -1) > 0); /* check whether read something */
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}
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l = strlen(p);
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if (l == 0 || 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_objlen(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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clearerr(f);
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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_checkstack(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_tointeger(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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luaL_argcheck(L, p && p[0] == '*', n, "invalid 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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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 (ferror(f))
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return pushresult(L, 0, NULL);
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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), 2);
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}
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static int io_readline (lua_State *L) {
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FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
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int sucess;
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if (f == NULL) /* file is already closed? */
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luaL_error(L, "file is already closed");
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sucess = read_line(L, f);
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if (ferror(f))
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return luaL_error(L, "%s", strerror(errno));
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if (sucess) return 1;
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else { /* EOF */
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if (lua_toboolean(L, lua_upvalueindex(2))) { /* generator created file? */
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lua_settop(L, 0);
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lua_pushvalue(L, lua_upvalueindex(1));
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aux_close(L); /* close it */
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}
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return 0;
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}
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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_checklstring(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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return pushresult(L, status, NULL);
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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), 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);
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int op = luaL_checkoption(L, 2, "cur", modenames);
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long offset = luaL_optlong(L, 3, 0);
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op = fseek(f, offset, mode[op]);
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if (op)
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return pushresult(L, 0, NULL); /* error */
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else {
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lua_pushinteger(L, ftell(f));
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return 1;
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}
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}
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static int f_setvbuf (lua_State *L) {
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static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
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static const char *const modenames[] = {"no", "full", "line", NULL};
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FILE *f = tofile(L);
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int op = luaL_checkoption(L, 2, NULL, modenames);
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lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
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int res = setvbuf(f, NULL, mode[op], sz);
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return pushresult(L, res == 0, NULL);
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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, NULL);
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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)) == 0, NULL);
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}
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static const luaL_Reg iolib[] = {
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{"close", io_close},
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{"flush", io_flush},
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{"input", io_input},
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{"lines", io_lines},
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{"open", io_open},
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{"output", io_output},
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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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{"type", io_type},
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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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{"close", io_close},
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{"flush", f_flush},
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{"lines", f_lines},
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{"read", f_read},
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{"seek", f_seek},
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{"setvbuf", f_setvbuf},
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{"write", f_write},
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{"__gc", io_gc},
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{"__tostring", io_tostring},
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{NULL, NULL}
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};
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static void createmeta (lua_State *L) {
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luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
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lua_pushvalue(L, -1); /* push metatable */
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lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
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luaL_register(L, NULL, flib); /* file methods */
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}
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static void createstdfile (lua_State *L, FILE *f, int k, const char *fname) {
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*newfile(L) = f;
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if (k > 0) {
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lua_pushvalue(L, -1);
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lua_rawseti(L, LUA_ENVIRONINDEX, k);
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}
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lua_pushvalue(L, -2); /* copy environment */
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lua_setfenv(L, -2); /* set it */
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lua_setfield(L, -3, fname);
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}
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static void newfenv (lua_State *L, lua_CFunction cls) {
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lua_createtable(L, 0, 1);
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lua_pushcfunction(L, cls);
|
|
lua_setfield(L, -2, "__close");
|
|
}
|
|
|
|
|
|
LUALIB_API int luaopen_io (lua_State *L) {
|
|
createmeta(L);
|
|
/* create (private) environment (with fields IO_INPUT, IO_OUTPUT, __close) */
|
|
newfenv(L, io_fclose);
|
|
lua_replace(L, LUA_ENVIRONINDEX);
|
|
/* open library */
|
|
luaL_register(L, LUA_IOLIBNAME, iolib);
|
|
/* create (and set) default files */
|
|
newfenv(L, io_noclose); /* close function for default files */
|
|
createstdfile(L, stdin, IO_INPUT, "stdin");
|
|
createstdfile(L, stdout, IO_OUTPUT, "stdout");
|
|
createstdfile(L, stderr, 0, "stderr");
|
|
lua_pop(L, 1); /* pop environment for default files */
|
|
lua_getfield(L, -1, "popen");
|
|
newfenv(L, io_pclose); /* create environment for 'popen' */
|
|
lua_setfenv(L, -2); /* set fenv for 'popen' */
|
|
lua_pop(L, 1); /* pop 'popen' */
|
|
return 1;
|
|
}
|
|
|