mirror of
https://github.com/lua/lua
synced 2024-11-26 14:51:21 +03:00
503 lines
12 KiB
C
503 lines
12 KiB
C
/*
|
|
** $Id: liolib.c,v 2.58 2005/02/18 12:40:02 roberto Exp roberto $
|
|
** Standard I/O (and system) library
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#define liolib_c
|
|
#define LUA_LIB
|
|
|
|
#include "lua.h"
|
|
|
|
#include "lauxlib.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
|
|
#define IO_INPUT 1
|
|
#define IO_OUTPUT 2
|
|
|
|
|
|
static const char *const fnames[] = {"input", "output"};
|
|
|
|
|
|
static int pushresult (lua_State *L, int i, const char *filename) {
|
|
if (i) {
|
|
lua_pushboolean(L, 1);
|
|
return 1;
|
|
}
|
|
else {
|
|
lua_pushnil(L);
|
|
if (filename)
|
|
lua_pushfstring(L, "%s: %s", filename, strerror(errno));
|
|
else
|
|
lua_pushfstring(L, "%s", strerror(errno));
|
|
lua_pushinteger(L, errno);
|
|
return 3;
|
|
}
|
|
}
|
|
|
|
|
|
static void fileerror (lua_State *L, int arg, const char *filename) {
|
|
lua_pushfstring(L, "%s: %s", filename, strerror(errno));
|
|
luaL_argerror(L, arg, lua_tostring(L, -1));
|
|
}
|
|
|
|
|
|
static FILE **topfile (lua_State *L) {
|
|
FILE **f = (FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE);
|
|
if (f == NULL) luaL_argerror(L, 1, "bad file");
|
|
return f;
|
|
}
|
|
|
|
|
|
static int io_type (lua_State *L) {
|
|
FILE **f = (FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE);
|
|
if (f == NULL) lua_pushnil(L);
|
|
else if (*f == NULL)
|
|
lua_pushliteral(L, "closed file");
|
|
else
|
|
lua_pushliteral(L, "file");
|
|
return 1;
|
|
}
|
|
|
|
|
|
static FILE *tofile (lua_State *L) {
|
|
FILE **f = topfile(L);
|
|
if (*f == NULL)
|
|
luaL_error(L, "attempt to use a closed file");
|
|
return *f;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** When creating file handles, always creates a `closed' file handle
|
|
** before opening the actual file; so, if there is a memory error, the
|
|
** file is not left opened.
|
|
*/
|
|
static FILE **newfile (lua_State *L) {
|
|
FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
|
|
*pf = NULL; /* file handle is currently `closed' */
|
|
luaL_getmetatable(L, LUA_FILEHANDLE);
|
|
lua_setmetatable(L, -2);
|
|
return pf;
|
|
}
|
|
|
|
|
|
static int aux_close (lua_State *L) {
|
|
FILE *f = tofile(L);
|
|
if (f == stdin || f == stdout || f == stderr)
|
|
return 0; /* file cannot be closed */
|
|
else {
|
|
int ok = (fclose(f) == 0);
|
|
if (ok)
|
|
*(FILE **)lua_touserdata(L, 1) = NULL; /* mark file as closed */
|
|
return ok;
|
|
}
|
|
}
|
|
|
|
|
|
static int io_close (lua_State *L) {
|
|
if (lua_isnone(L, 1))
|
|
lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
|
|
return pushresult(L, aux_close(L), NULL);
|
|
}
|
|
|
|
|
|
static int io_gc (lua_State *L) {
|
|
FILE **f = topfile(L);
|
|
if (*f != NULL) /* ignore closed files */
|
|
aux_close(L);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int io_tostring (lua_State *L) {
|
|
FILE *f = *topfile(L);
|
|
if (f == NULL)
|
|
lua_pushstring(L, "file (closed)");
|
|
else
|
|
lua_pushfstring(L, "file (%p)", f);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_open (lua_State *L) {
|
|
const char *filename = luaL_checkstring(L, 1);
|
|
const char *mode = luaL_optstring(L, 2, "r");
|
|
FILE **pf = newfile(L);
|
|
*pf = fopen(filename, mode);
|
|
return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
|
|
}
|
|
|
|
|
|
static int io_tmpfile (lua_State *L) {
|
|
FILE **pf = newfile(L);
|
|
*pf = tmpfile();
|
|
return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
|
|
}
|
|
|
|
|
|
static FILE *getiofile (lua_State *L, int findex) {
|
|
FILE *f;
|
|
lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
|
|
lua_assert(luaL_checkudata(L, -1, LUA_FILEHANDLE));
|
|
f = *(FILE **)lua_touserdata(L, -1);
|
|
if (f == NULL)
|
|
luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
|
|
return f;
|
|
}
|
|
|
|
|
|
static int g_iofile (lua_State *L, int f, const char *mode) {
|
|
if (!lua_isnoneornil(L, 1)) {
|
|
const char *filename = lua_tostring(L, 1);
|
|
if (filename) {
|
|
FILE **pf = newfile(L);
|
|
*pf = fopen(filename, mode);
|
|
if (*pf == NULL)
|
|
fileerror(L, 1, filename);
|
|
}
|
|
else {
|
|
tofile(L); /* check that it's a valid file handle */
|
|
lua_pushvalue(L, 1);
|
|
}
|
|
lua_assert(luaL_checkudata(L, -1, LUA_FILEHANDLE));
|
|
lua_rawseti(L, LUA_ENVIRONINDEX, f);
|
|
}
|
|
/* return current value */
|
|
lua_rawgeti(L, LUA_ENVIRONINDEX, f);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_input (lua_State *L) {
|
|
return g_iofile(L, IO_INPUT, "r");
|
|
}
|
|
|
|
|
|
static int io_output (lua_State *L) {
|
|
return g_iofile(L, IO_OUTPUT, "w");
|
|
}
|
|
|
|
|
|
static int io_readline (lua_State *L);
|
|
|
|
|
|
static void aux_lines (lua_State *L, int idx, int toclose) {
|
|
lua_pushvalue(L, idx);
|
|
lua_pushboolean(L, toclose); /* close/not close file when finished */
|
|
lua_pushcclosure(L, io_readline, 2);
|
|
}
|
|
|
|
|
|
static int f_lines (lua_State *L) {
|
|
tofile(L); /* check that it's a valid file handle */
|
|
aux_lines(L, 1, 0);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_lines (lua_State *L) {
|
|
if (lua_isnoneornil(L, 1)) { /* no arguments? */
|
|
/* will iterate over default input */
|
|
lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
|
|
return f_lines(L);
|
|
}
|
|
else {
|
|
const char *filename = luaL_checkstring(L, 1);
|
|
FILE **pf = newfile(L);
|
|
*pf = fopen(filename, "r");
|
|
if (*pf == NULL)
|
|
fileerror(L, 1, filename);
|
|
aux_lines(L, lua_gettop(L), 1);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** READ
|
|
** =======================================================
|
|
*/
|
|
|
|
|
|
static int read_number (lua_State *L, FILE *f) {
|
|
lua_Number d;
|
|
if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
|
|
lua_pushnumber(L, d);
|
|
return 1;
|
|
}
|
|
else return 0; /* read fails */
|
|
}
|
|
|
|
|
|
static int test_eof (lua_State *L, FILE *f) {
|
|
int c = getc(f);
|
|
ungetc(c, f);
|
|
lua_pushlstring(L, NULL, 0);
|
|
return (c != EOF);
|
|
}
|
|
|
|
|
|
static int read_line (lua_State *L, FILE *f) {
|
|
luaL_Buffer b;
|
|
luaL_buffinit(L, &b);
|
|
for (;;) {
|
|
size_t l;
|
|
char *p = luaL_prepbuffer(&b);
|
|
if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
|
|
luaL_pushresult(&b); /* close buffer */
|
|
return (lua_strlen(L, -1) > 0); /* check whether read something */
|
|
}
|
|
l = strlen(p);
|
|
if (p[l-1] != '\n')
|
|
luaL_addsize(&b, l);
|
|
else {
|
|
luaL_addsize(&b, l - 1); /* do not include `eol' */
|
|
luaL_pushresult(&b); /* close buffer */
|
|
return 1; /* read at least an `eol' */
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static int read_chars (lua_State *L, FILE *f, size_t n) {
|
|
size_t rlen; /* how much to read */
|
|
size_t nr; /* number of chars actually read */
|
|
luaL_Buffer b;
|
|
luaL_buffinit(L, &b);
|
|
rlen = LUAL_BUFFERSIZE; /* try to read that much each time */
|
|
do {
|
|
char *p = luaL_prepbuffer(&b);
|
|
if (rlen > n) rlen = n; /* cannot read more than asked */
|
|
nr = fread(p, sizeof(char), rlen, f);
|
|
luaL_addsize(&b, nr);
|
|
n -= nr; /* still have to read `n' chars */
|
|
} while (n > 0 && nr == rlen); /* until end of count or eof */
|
|
luaL_pushresult(&b); /* close buffer */
|
|
return (n == 0 || lua_strlen(L, -1) > 0);
|
|
}
|
|
|
|
|
|
static int g_read (lua_State *L, FILE *f, int first) {
|
|
int nargs = lua_gettop(L) - 1;
|
|
int success;
|
|
int n;
|
|
clearerr(f);
|
|
if (nargs == 0) { /* no arguments? */
|
|
success = read_line(L, f);
|
|
n = first+1; /* to return 1 result */
|
|
}
|
|
else { /* ensure stack space for all results and for auxlib's buffer */
|
|
luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
|
|
success = 1;
|
|
for (n = first; nargs-- && success; n++) {
|
|
if (lua_type(L, n) == LUA_TNUMBER) {
|
|
size_t l = (size_t)lua_tointeger(L, n);
|
|
success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
|
|
}
|
|
else {
|
|
const char *p = lua_tostring(L, n);
|
|
luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
|
|
switch (p[1]) {
|
|
case 'n': /* number */
|
|
success = read_number(L, f);
|
|
break;
|
|
case 'l': /* line */
|
|
success = read_line(L, f);
|
|
break;
|
|
case 'a': /* file */
|
|
read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */
|
|
success = 1; /* always success */
|
|
break;
|
|
case 'w': /* word */
|
|
return luaL_error(L, "obsolete option `*w' to `read'");
|
|
default:
|
|
return luaL_argerror(L, n, "invalid format");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (ferror(f))
|
|
return pushresult(L, 0, NULL);
|
|
if (!success) {
|
|
lua_pop(L, 1); /* remove last result */
|
|
lua_pushnil(L); /* push nil instead */
|
|
}
|
|
return n - first;
|
|
}
|
|
|
|
|
|
static int io_read (lua_State *L) {
|
|
return g_read(L, getiofile(L, IO_INPUT), 1);
|
|
}
|
|
|
|
|
|
static int f_read (lua_State *L) {
|
|
return g_read(L, tofile(L), 2);
|
|
}
|
|
|
|
|
|
static int io_readline (lua_State *L) {
|
|
FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
|
|
int sucess;
|
|
if (f == NULL) /* file is already closed? */
|
|
luaL_error(L, "file is already closed");
|
|
sucess = read_line(L, f);
|
|
if (ferror(f))
|
|
luaL_error(L, "%s", strerror(errno));
|
|
if (sucess) return 1;
|
|
else { /* EOF */
|
|
if (lua_toboolean(L, lua_upvalueindex(2))) { /* generator created file? */
|
|
lua_settop(L, 0);
|
|
lua_pushvalue(L, lua_upvalueindex(1));
|
|
aux_close(L); /* close it */
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
static int g_write (lua_State *L, FILE *f, int arg) {
|
|
int nargs = lua_gettop(L) - 1;
|
|
int status = 1;
|
|
for (; nargs--; arg++) {
|
|
if (lua_type(L, arg) == LUA_TNUMBER) {
|
|
/* optimization: could be done exactly as for strings */
|
|
status = status &&
|
|
fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
|
|
}
|
|
else {
|
|
size_t l;
|
|
const char *s = luaL_checklstring(L, arg, &l);
|
|
status = status && (fwrite(s, sizeof(char), l, f) == l);
|
|
}
|
|
}
|
|
return pushresult(L, status, NULL);
|
|
}
|
|
|
|
|
|
static int io_write (lua_State *L) {
|
|
return g_write(L, getiofile(L, IO_OUTPUT), 1);
|
|
}
|
|
|
|
|
|
static int f_write (lua_State *L) {
|
|
return g_write(L, tofile(L), 2);
|
|
}
|
|
|
|
|
|
static int f_seek (lua_State *L) {
|
|
static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
|
|
static const char *const modenames[] = {"set", "cur", "end", NULL};
|
|
FILE *f = tofile(L);
|
|
int op = luaL_findstring(luaL_optstring(L, 2, "cur"), modenames);
|
|
lua_Integer offset = luaL_optinteger(L, 3, 0);
|
|
luaL_argcheck(L, op != -1, 2, "invalid mode");
|
|
op = fseek(f, offset, mode[op]);
|
|
if (op)
|
|
return pushresult(L, 0, NULL); /* error */
|
|
else {
|
|
lua_pushinteger(L, ftell(f));
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
static int f_setvbuf (lua_State *L) {
|
|
static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
|
|
static const char *const modenames[] = {"no", "full", "line", NULL};
|
|
FILE *f = tofile(L);
|
|
int op = luaL_findstring(luaL_checkstring(L, 2), modenames);
|
|
luaL_argcheck(L, op != -1, 2, "invalid mode");
|
|
return pushresult(L, setvbuf(f, NULL, mode[op], 0) == 0, NULL);
|
|
}
|
|
|
|
|
|
|
|
static int io_flush (lua_State *L) {
|
|
return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
|
|
}
|
|
|
|
|
|
static int f_flush (lua_State *L) {
|
|
return pushresult(L, fflush(tofile(L)) == 0, NULL);
|
|
}
|
|
|
|
|
|
static const luaL_reg iolib[] = {
|
|
{"input", io_input},
|
|
{"output", io_output},
|
|
{"lines", io_lines},
|
|
{"close", io_close},
|
|
{"flush", io_flush},
|
|
{"open", io_open},
|
|
{"read", io_read},
|
|
{"tmpfile", io_tmpfile},
|
|
{"type", io_type},
|
|
{"write", io_write},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static const luaL_reg flib[] = {
|
|
{"flush", f_flush},
|
|
{"read", f_read},
|
|
{"lines", f_lines},
|
|
{"seek", f_seek},
|
|
{"setvbuf", f_setvbuf},
|
|
{"write", f_write},
|
|
{"close", io_close},
|
|
{"__gc", io_gc},
|
|
{"__tostring", io_tostring},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static void createmeta (lua_State *L) {
|
|
luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
|
|
lua_pushvalue(L, -1); /* push metatable */
|
|
lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
|
|
luaL_openlib(L, NULL, flib, 0); /* file methods */
|
|
}
|
|
|
|
|
|
static void createupval (lua_State *L) {
|
|
lua_newtable(L);
|
|
/* create (and set) default files */
|
|
*newfile(L) = stdin;
|
|
lua_rawseti(L, -2, IO_INPUT);
|
|
*newfile(L) = stdout;
|
|
lua_rawseti(L, -2, IO_OUTPUT);
|
|
}
|
|
|
|
|
|
|
|
LUALIB_API int luaopen_io (lua_State *L) {
|
|
createmeta(L);
|
|
createupval(L);
|
|
lua_pushvalue(L, -1);
|
|
lua_replace(L, LUA_ENVIRONINDEX);
|
|
luaL_openlib(L, LUA_IOLIBNAME, iolib, 0);
|
|
/* put predefined file handles into `io' table */
|
|
lua_rawgeti(L, -2, IO_INPUT); /* get current input from upval */
|
|
lua_setfield(L, -2, "stdin"); /* io.stdin = upval[IO_INPUT] */
|
|
lua_rawgeti(L, -2, IO_OUTPUT); /* get current output from upval */
|
|
lua_setfield(L, -2, "stdout"); /* io.stdout = upval[IO_OUTPUT] */
|
|
*newfile(L) = stderr;
|
|
lua_setfield(L, -2, "stderr"); /* io.stderr = newfile(stderr) */
|
|
return 1;
|
|
}
|
|
|