mirror of
https://github.com/lua/lua
synced 2024-11-22 21:01:26 +03:00
607 lines
15 KiB
C
607 lines
15 KiB
C
/*
|
|
** $Id: liolib.c,v 2.4 2002/05/02 17:12:27 roberto Exp roberto $
|
|
** Standard I/O (and system) library
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include <errno.h>
|
|
#include <locale.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include "lua.h"
|
|
|
|
#include "lauxlib.h"
|
|
#include "luadebug.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** FILE Operations
|
|
** =======================================================
|
|
*/
|
|
|
|
|
|
#ifndef POPEN
|
|
#define pclose(f) (-1)
|
|
#endif
|
|
|
|
|
|
#define FILEHANDLE "FileHandle"
|
|
#define CLOSEDFILEHANDLE "ClosedFileHandle"
|
|
|
|
#define IO_INPUT "_input"
|
|
#define IO_OUTPUT "_output"
|
|
|
|
|
|
static int pushresult (lua_State *L, int i) {
|
|
if (i) {
|
|
lua_pushboolean(L, 1);
|
|
return 1;
|
|
}
|
|
else {
|
|
lua_pushnil(L);
|
|
lua_pushstring(L, strerror(errno));
|
|
lua_pushnumber(L, errno);
|
|
return 3;
|
|
}
|
|
}
|
|
|
|
|
|
static FILE *tofile (lua_State *L, int findex) {
|
|
FILE **f = (FILE **)lua_touserdata(L, findex);
|
|
if (f && lua_getmetatable(L, findex) &&
|
|
lua_equal(L, -1, lua_upvalueindex(1))) {
|
|
lua_pop(L, 1);
|
|
return *f;
|
|
}
|
|
luaL_argerror(L, findex, "bad file");
|
|
return NULL; /* to avoid warnings */
|
|
}
|
|
|
|
|
|
static void newfile (lua_State *L, FILE *f) {
|
|
lua_newpointerbox(L, f);
|
|
lua_pushliteral(L, FILEHANDLE);
|
|
lua_rawget(L, LUA_REGISTRYINDEX);
|
|
lua_setmetatable(L, -2);
|
|
}
|
|
|
|
|
|
static void registerfile (lua_State *L, FILE *f, const char *name,
|
|
const char *impname) {
|
|
lua_pushstring(L, name);
|
|
newfile(L, f);
|
|
if (impname) {
|
|
lua_pushstring(L, impname);
|
|
lua_pushvalue(L, -2);
|
|
lua_settable(L, -6);
|
|
}
|
|
lua_settable(L, -3);
|
|
}
|
|
|
|
|
|
static int setnewfile (lua_State *L, FILE *f) {
|
|
if (f == NULL)
|
|
return pushresult(L, 0);
|
|
else {
|
|
newfile(L, f);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
static int io_close (lua_State *L) {
|
|
FILE *f = tofile(L, 1);
|
|
int status = 1;
|
|
if (f != stdin && f != stdout && f != stderr) {
|
|
lua_settop(L, 1); /* make sure file is on top */
|
|
lua_pushliteral(L, CLOSEDFILEHANDLE);
|
|
lua_rawget(L, LUA_REGISTRYINDEX);
|
|
lua_setmetatable(L, 1);
|
|
status = (pclose(f) != -1) || (fclose(f) == 0);
|
|
}
|
|
return pushresult(L, status);
|
|
}
|
|
|
|
|
|
static int io_open (lua_State *L) {
|
|
FILE *f = fopen(luaL_check_string(L, 1), luaL_opt_string(L, 2, "r"));
|
|
return setnewfile(L, f);
|
|
}
|
|
|
|
|
|
static int io_popen (lua_State *L) {
|
|
#ifndef POPEN
|
|
luaL_verror(L, "`popen' not supported");
|
|
return 0;
|
|
#else
|
|
FILE *f = popen(luaL_check_string(L, 1), luaL_opt_string(L, 2, "r"));
|
|
return setnewfile(L, f);
|
|
#endif
|
|
}
|
|
|
|
|
|
static int io_tmpfile (lua_State *L) {
|
|
return setnewfile(L, tmpfile());
|
|
}
|
|
|
|
|
|
static FILE *getiofile (lua_State *L, const char *name) {
|
|
lua_pushstring(L, name);
|
|
lua_rawget(L, lua_upvalueindex(1));
|
|
return tofile(L, -1);
|
|
}
|
|
|
|
|
|
static int g_iofile (lua_State *L, const char *name, const char *mode) {
|
|
if (lua_isnone(L, 1)) {
|
|
lua_pushstring(L, name);
|
|
lua_rawget(L, lua_upvalueindex(1));
|
|
return 1;
|
|
}
|
|
else {
|
|
const char *filename = lua_tostring(L, 1);
|
|
lua_pushstring(L, name);
|
|
if (filename) {
|
|
FILE *f = fopen(filename, mode);
|
|
luaL_arg_check(L, f, 1, strerror(errno));
|
|
newfile(L, f);
|
|
}
|
|
else {
|
|
lua_pushvalue(L, 1);
|
|
tofile(L, -1); /* check that it's a valid file handle */
|
|
}
|
|
lua_rawset(L, lua_upvalueindex(1));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
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");
|
|
}
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** 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;
|
|
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_check_stack(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_tonumber(L, n);
|
|
success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
|
|
}
|
|
else {
|
|
const char *p = lua_tostring(L, n);
|
|
if (!p || p[0] != '*')
|
|
return luaL_verror(L, "invalid `read' 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_verror(L, "obsolete option `*w'");
|
|
break;
|
|
default:
|
|
return luaL_argerror(L, n, "invalid format");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
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, 1), 2);
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
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_check_lstr(L, arg, &l);
|
|
status = status && (fwrite(s, sizeof(char), l, f) == l);
|
|
}
|
|
}
|
|
pushresult(L, status);
|
|
return 1;
|
|
}
|
|
|
|
|
|
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, 1), 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, 1);
|
|
int op = luaL_findstring(luaL_opt_string(L, 2, "cur"), modenames);
|
|
long offset = luaL_opt_long(L, 3, 0);
|
|
luaL_arg_check(L, op != -1, 2, "invalid mode");
|
|
op = fseek(f, offset, mode[op]);
|
|
if (op)
|
|
return pushresult(L, 0); /* error */
|
|
else {
|
|
lua_pushnumber(L, ftell(f));
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
static int io_flush (lua_State *L) {
|
|
return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0);
|
|
}
|
|
|
|
|
|
static int f_flush (lua_State *L) {
|
|
return pushresult(L, fflush(tofile(L, 1)) == 0);
|
|
}
|
|
|
|
|
|
static const luaL_reg iolib[] = {
|
|
{"input", io_input},
|
|
{"output", io_output},
|
|
{"close", io_close},
|
|
{"flush", io_flush},
|
|
{"open", io_open},
|
|
{"popen", io_popen},
|
|
{"read", io_read},
|
|
{"tmpfile", io_tmpfile},
|
|
{"write", io_write},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static const luaL_reg flib[] = {
|
|
{"flush", f_flush},
|
|
{"read", f_read},
|
|
{"seek", f_seek},
|
|
{"write", f_write},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static void createmeta (lua_State *L) {
|
|
lua_pushliteral(L, FILEHANDLE); /* S: FH */
|
|
lua_newtable(L); /* S: mt FH */
|
|
/* close files when collected */
|
|
lua_pushliteral(L, "__gc"); /* S: `gc' mt FH */
|
|
lua_pushvalue(L, -2); /* S: mt `gc' mt FH */
|
|
lua_pushcclosure(L, io_close, 1); /* S: close `gc' mt FH */
|
|
lua_rawset(L, -3); /* S: mt FH */
|
|
/* file methods */
|
|
lua_pushliteral(L, "__gettable"); /* S: `gettable' mt FH */
|
|
lua_pushvalue(L, -2); /* S: mt `gettable' mt FH */
|
|
lua_rawset(L, -3); /* S: mt FH */
|
|
lua_pushvalue(L, -1); /* S: mt mt FH */
|
|
luaL_openlib(L, flib, 1); /* S: mt FH */
|
|
/* put new metatable into registry */
|
|
lua_rawset(L, LUA_REGISTRYINDEX); /* S: empty */
|
|
/* meta table for CLOSEDFILEHANDLE */
|
|
lua_pushliteral(L, CLOSEDFILEHANDLE);
|
|
lua_newtable(L);
|
|
lua_rawset(L, LUA_REGISTRYINDEX);
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** Other O.S. Operations
|
|
** =======================================================
|
|
*/
|
|
|
|
static int io_execute (lua_State *L) {
|
|
lua_pushnumber(L, system(luaL_check_string(L, 1)));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_remove (lua_State *L) {
|
|
return pushresult(L, remove(luaL_check_string(L, 1)) == 0);
|
|
}
|
|
|
|
|
|
static int io_rename (lua_State *L) {
|
|
return pushresult(L, rename(luaL_check_string(L, 1),
|
|
luaL_check_string(L, 2)) == 0);
|
|
}
|
|
|
|
|
|
static int io_tmpname (lua_State *L) {
|
|
char buff[L_tmpnam];
|
|
if (tmpnam(buff) != buff)
|
|
return luaL_verror(L, "unable to generate a unique filename");
|
|
lua_pushstring(L, buff);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_getenv (lua_State *L) {
|
|
lua_pushstring(L, getenv(luaL_check_string(L, 1))); /* if NULL push nil */
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_clock (lua_State *L) {
|
|
lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** Time/Date operations
|
|
** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
|
|
** wday=%w+1, yday=%j, isdst=? }
|
|
** =======================================================
|
|
*/
|
|
|
|
static void setfield (lua_State *L, const char *key, int value) {
|
|
lua_pushstring(L, key);
|
|
lua_pushnumber(L, value);
|
|
lua_rawset(L, -3);
|
|
}
|
|
|
|
|
|
static int getfield (lua_State *L, const char *key, int d) {
|
|
int res;
|
|
lua_pushstring(L, key);
|
|
lua_gettable(L, -2);
|
|
if (lua_isnumber(L, -1))
|
|
res = (int)(lua_tonumber(L, -1));
|
|
else {
|
|
if (d == -2)
|
|
return luaL_verror(L, "field `%s' missing in date table", key);
|
|
res = d;
|
|
}
|
|
lua_pop(L, 1);
|
|
return res;
|
|
}
|
|
|
|
|
|
static int io_date (lua_State *L) {
|
|
const char *s = luaL_opt_string(L, 1, "%c");
|
|
time_t t = (time_t)(luaL_opt_number(L, 2, -1));
|
|
struct tm *stm;
|
|
if (t == (time_t)(-1)) /* no time given? */
|
|
t = time(NULL); /* use current time */
|
|
if (*s == '!') { /* UTC? */
|
|
stm = gmtime(&t);
|
|
s++; /* skip `!' */
|
|
}
|
|
else
|
|
stm = localtime(&t);
|
|
if (stm == NULL) /* invalid date? */
|
|
lua_pushnil(L);
|
|
else if (strcmp(s, "*t") == 0) {
|
|
lua_newtable(L);
|
|
setfield(L, "sec", stm->tm_sec);
|
|
setfield(L, "min", stm->tm_min);
|
|
setfield(L, "hour", stm->tm_hour);
|
|
setfield(L, "day", stm->tm_mday);
|
|
setfield(L, "month", stm->tm_mon+1);
|
|
setfield(L, "year", stm->tm_year+1900);
|
|
setfield(L, "wday", stm->tm_wday+1);
|
|
setfield(L, "yday", stm->tm_yday+1);
|
|
setfield(L, "isdst", stm->tm_isdst);
|
|
}
|
|
else {
|
|
char b[256];
|
|
if (strftime(b, sizeof(b), s, stm))
|
|
lua_pushstring(L, b);
|
|
else
|
|
return luaL_verror(L, "invalid `date' format");
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int io_time (lua_State *L) {
|
|
if (lua_isnoneornil(L, 1)) /* called without args? */
|
|
lua_pushnumber(L, time(NULL)); /* return current time */
|
|
else {
|
|
time_t t;
|
|
struct tm ts;
|
|
luaL_check_type(L, 1, LUA_TTABLE);
|
|
lua_settop(L, 1); /* make sure table is at the top */
|
|
ts.tm_sec = getfield(L, "sec", 0);
|
|
ts.tm_min = getfield(L, "min", 0);
|
|
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;
|
|
}
|
|
|