mirrors
/
lua
mirror of https://github.com/lua/lua
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
lua/liolib.c

703 lines
18 KiB
C
Raw Blame History

/*
** $Id: liolib.c,v 1.116 2001/06/22 13:49:42 roberto Exp roberto $
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define LUA_PRIVATE
#include "lua.h"
#include "lauxlib.h"
#include "luadebug.h"
#include "lualib.h"
#ifndef OLD_ANSI
#include <errno.h>
#include <locale.h>
#endif
#ifndef l_realloc
#define l_malloc(s) malloc(s)
#define l_realloc(b,os,s) realloc(b, s)
#define l_free(b, os) free(b)
#endif
#ifdef POPEN
/* FILE *popen();
int pclose(); */
#define CLOSEFILE(L, f) ((pclose(f) == -1) ? fclose(f) : 0)
#else
/* no support for popen */
#define popen(x,y) NULL /* that is, popen always fails */
#define CLOSEFILE(L, f) (fclose(f))
#endif
#define INFILE 0
#define OUTFILE 1
#define NOFILE 2
#define FILEHANDLE l_s("FileHandle")
#define CLOSEDFILEHANDLE l_s("ClosedFileHandle")
static const l_char *const filenames[] = {l_s("_INPUT"), l_s("_OUTPUT")};
static const l_char *const basicfiles[] = {l_s("_STDIN"), l_s("_STDOUT")};
static int pushresult (lua_State *L, int i) {
if (i) {
lua_pushnumber(L, 1);
return 1;
}
else {
lua_pushnil(L);
lua_pushstring(L, strerror(errno));
lua_pushnumber(L, errno);
return 3;
}
}
/*
** {======================================================
** FILE Operations
** =======================================================
*/
#define checkfile(L,f) (strcmp(lua_xtypename(L,(f)), FILEHANDLE) == 0)
static FILE *getopthandle (lua_State *L, int inout) {
FILE *p = (FILE *)lua_touserdata(L, 1);
if (p != NULL) { /* is it a userdata ? */
if (!checkfile(L, 1)) { /* not a valid file handle? */
if (strcmp(lua_xtypename(L, 1), CLOSEDFILEHANDLE) == 0)
luaL_argerror(L, 1, l_s("file is closed"));
else
luaL_argerror(L, 1, l_s("(invalid value)"));
}
lua_pushvalue(L, 1); lua_remove(L, 1); /* move it to stack top */
}
else { /* try global value */
lua_getglobal(L, filenames[inout]);
if (!checkfile(L,-1))
luaL_verror(L, l_s("global variable `%.10s' is not a valid file handle"),
filenames[inout]);
p = (FILE *)lua_touserdata(L, -1);
}
return p; /* leave handle at stack top to avoid GC */
}
static void newfile (lua_State *L, FILE *f) {
lua_newuserdatabox(L, f);
lua_settag(L, lua_name2tag(L, FILEHANDLE));
}
static void newfilewithname (lua_State *L, FILE *f, const l_char *name) {
newfile(L, f);
lua_setglobal(L, name);
}
static int setnewfile (lua_State *L, FILE *f, int inout) {
if (f == NULL)
return pushresult(L, 0);
else {
newfile(L, f);
if (inout != NOFILE) {
lua_pushvalue(L, -1);
lua_setglobal(L, filenames[inout]);
}
return 1;
}
}
static void resetfile (lua_State *L, int inout) {
lua_getglobal(L, basicfiles[inout]);
lua_setglobal(L, filenames[inout]);
}
static int io_close (lua_State *L) {
FILE *f = (FILE *)luaL_check_userdata(L, 1, FILEHANDLE);
int status = 1;
if (f != stdin && f != stdout && f != stderr) {
lua_settop(L, 1); /* make sure file is on top */
lua_settag(L, lua_name2tag(L, CLOSEDFILEHANDLE));
status = (CLOSEFILE(L, f) == 0);
}
return pushresult(L, status);
}
static int file_collect (lua_State *L) {
FILE *f = (FILE *)luaL_check_userdata(L, 1, FILEHANDLE);
if (f != stdin && f != stdout && f != stderr)
CLOSEFILE(L, f);
return 0;
}
static int io_open (lua_State *L) {
FILE *f = fopen(luaL_check_string(L, 1), luaL_check_string(L, 2));
return setnewfile(L, f, NOFILE);
}
static int io_tmpfile (lua_State *L) {
return setnewfile(L, tmpfile(), NOFILE);
}
static int io_fromto (lua_State *L, int inout, const l_char *mode) {
FILE *current;
if (lua_isnull(L, 1)) {
getopthandle(L, inout);
resetfile(L, inout);
return io_close(L);
}
else {
const l_char *s = luaL_check_string(L, 1);
current = (*s == l_c('|')) ? popen(s+1, mode) : fopen(s, mode);
return setnewfile(L, current, inout);
}
}
static int io_readfrom (lua_State *L) {
return io_fromto(L, INFILE, l_s("r"));
}
static int io_writeto (lua_State *L) {
return io_fromto(L, OUTFILE, l_s("w"));
}
static int io_appendto (lua_State *L) {
FILE *current = fopen(luaL_check_string(L, 1), l_s("a"));
return setnewfile(L, current, OUTFILE);
}
/*
** {======================================================
** READ
** =======================================================
*/
#ifndef LUA_MAXUNTIL
#define LUA_MAXUNTIL 100
#endif
/*
** Knuth-Morris-Pratt algorithm for string searching
** (based on `Algorithms in MODULA-3', Robert Sedgewick;
** Addison-Wesley, 1993.)
*/
static void prep_read_until (int next[], const l_char *p, int pl) {
int i = 0;
int j = -1;
next[0] = -1;
while (i < pl) {
if (j == -1 || p[i] == p[j]) {
i++; j++; next[i] = j;
}
else j = next[j];
}
}
static int read_until (lua_State *L, FILE *f, const l_char *p, int pl) {
l_charint c;
int j;
int next[LUA_MAXUNTIL+1];
luaL_Buffer b;
luaL_buffinit(L, &b);
prep_read_until(next, p, pl);
j = 0;
while ((c = fgetc(f)) != EOF) {
NoRead:
if (c == p[j]) {
j++; /* go to next char in pattern */
if (j == pl) { /* complete match? */
luaL_pushresult(&b); /* close buffer */
return 1; /* always success */
}
}
else if (j == 0)
luaL_putchar(&b, c);
else { /* match fail */
luaL_addlstring(&b, p, j - next[j]); /* put failed part on result */
j = next[j]; /* backtrack pattern index */
goto NoRead; /* repeat without reading next char */
}
}
/* end of file without a match */
luaL_addlstring(&b, p, j); /* put failed part on result */
luaL_pushresult(&b); /* close buffer */
return (lua_strlen(L, -1) > 0);
}
static int read_number (lua_State *L, FILE *f) {
double d;
if (fscanf(f, l_s(LUA_SCAN_NUMBER), &d) == 1) {
lua_pushnumber(L, d);
return 1;
}
else return 0; /* read fails */
}
static int test_eof (lua_State *L, FILE *f) {
l_charint c = fgetc(f);
ungetc(c, f);
lua_pushlstring(L, NULL, 0);
return (c != EOF);
}
static int read_chars (lua_State *L, FILE *f, size_t n) {
size_t rlen;
luaL_Buffer b;
luaL_buffinit(L, &b);
rlen = LUAL_BUFFERSIZE;
do {
l_char *p = luaL_prepbuffer(&b);
if (rlen > n) rlen = n;
rlen = fread(p, sizeof(l_char), rlen, f);
luaL_addsize(&b, rlen);
n -= rlen;
} while (n > 0 && rlen > 0); /* until end of count or eof */
luaL_pushresult(&b); /* close buffer */
return (n == 0 || lua_strlen(L, -1) > 0);
}
static int io_read (lua_State *L) {
FILE *f = getopthandle(L, INFILE);
int nargs = lua_gettop(L) - 1;
int success;
int n;
if (nargs == 0) { /* no arguments? */
success = read_until(L, f, l_s("\n"), 1); /* read until \n (a line) */
n = 2; /* will return n-1 results */
}
else { /* ensure stack space for all results and for auxlib's buffer */
luaL_checkstack(L, nargs+LUA_MINSTACK, l_s("too many arguments"));
success = 1;
for (n = 1; n<=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 l_char *p = lua_tostring(L, n);
if (!p || p[0] != l_c('*'))
lua_error(L, l_s("invalid `read' option"));
switch (p[1]) {
case l_c('n'): /* number */
success = read_number(L, f);
break;
case l_c('l'): /* line */
success = read_until(L, f, l_s("\n"), 1); /* read until \n */
break;
case l_c('a'): /* file */
read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */
success = 1; /* always success */
break;
case l_c('w'): /* word */
lua_error(L, "option `*w' is deprecated");
break;
case l_c('u'): { /* read until */
size_t pl = lua_strlen(L, n) - 2;
luaL_arg_check(L, 0 < pl && pl <= LUA_MAXUNTIL, n,
l_s("invalid read-until length"));
success = read_until(L, f, p+2, (int)pl);
break;
}
default:
luaL_argerror(L, n, l_s("invalid format"));
success = 0; /* to avoid warnings */
}
}
}
}
if (!success) {
lua_pop(L, 1); /* remove last result */
lua_pushnil(L); /* push nil instead */
}
return n - 1;
}
/* }====================================================== */
static int io_write (lua_State *L) {
FILE *f = getopthandle(L, OUTFILE);
int nargs = lua_gettop(L)-1;
int arg;
int status = 1;
for (arg=1; arg<=nargs; arg++) {
if (lua_type(L, arg) == LUA_TNUMBER) {
/* optimization: could be done exactly as for strings */
status = status &&
fprintf(f, l_s(LUA_NUMBER_FMT), lua_tonumber(L, arg)) > 0;
}
else {
size_t l;
const l_char *s = luaL_check_lstr(L, arg, &l);
status = status && (fwrite(s, sizeof(l_char), l, f) == l);
}
}
pushresult(L, status);
return 1;
}
static int io_seek (lua_State *L) {
static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
static const l_char *const modenames[] = {l_s("set"), l_s("cur"), l_s("end"), NULL};
FILE *f = (FILE *)luaL_check_userdata(L, 1, FILEHANDLE);
int op = luaL_findstring(luaL_opt_string(L, 2, l_s("cur")), modenames);
long offset = luaL_opt_long(L, 3, 0);
luaL_arg_check(L, op != -1, 2, l_s("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) {
FILE *f = (lua_isnull(L, 1)) ? (FILE *)NULL :
(FILE *)luaL_check_userdata(L, 1, FILEHANDLE);
return pushresult(L, fflush(f) == 0);
}
/* }====================================================== */
/*
** {======================================================
** 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) {
l_char buff[L_tmpnam];
if (tmpnam(buff) != buff)
lua_error(L, l_s("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 l_char *key, int value) {
lua_pushstring(L, key);
lua_pushnumber(L, value);
lua_rawset(L, -3);
}
static int getfield (lua_State *L, const l_char *key, int d) {
int res;
lua_pushstring(L, key);
lua_rawget(L, -2);
if (lua_isnumber(L, -1))
res = (int)lua_tonumber(L, -1);
else {
if (d == -2)
luaL_verror(L, l_s("field `%.20s' missing in date table"), key);
res = d;
}
lua_pop(L, 1);
return res;
}
static int io_date (lua_State *L) {
const l_char *s = luaL_opt_string(L, 1, l_s("%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 == l_c('!')) { /* UTC? */
stm = gmtime(&t);
s++; /* skip `!' */
}
else
stm = localtime(&t);
if (stm == NULL) /* invalid date? */
lua_pushnil(L);
else if (strcmp(s, l_s("*t")) == 0) {
lua_newtable(L);
setfield(L, l_s("sec"), stm->tm_sec);
setfield(L, l_s("min"), stm->tm_min);
setfield(L, l_s("hour"), stm->tm_hour);
setfield(L, l_s("day"), stm->tm_mday);
setfield(L, l_s("month"), stm->tm_mon+1);
setfield(L, l_s("year"), stm->tm_year+1900);
setfield(L, l_s("wday"), stm->tm_wday+1);
setfield(L, l_s("yday"), stm->tm_yday+1);
setfield(L, l_s("isdst"), stm->tm_isdst);
}
else {
l_char b[256];
if (strftime(b, sizeof(b), s, stm))
lua_pushstring(L, b);
else
lua_error(L, l_s("invalid `date' format"));
}
return 1;
}
static int io_time (lua_State *L) {
if (lua_isnull(L, 1)) /* called without args? */
lua_pushnumber(L, time(NULL)); /* return current time */
else {
time_t t;
struct tm ts;
luaL_checktype(L, 1, LUA_TTABLE);
lua_settop(L, 1); /* make sure table is at the top */
ts.tm_sec = getfield(L, l_s("sec"), 0);
ts.tm_min = getfield(L, l_s("min"), 0);
ts.tm_hour = getfield(L, l_s("hour"), 12);
ts.tm_mday = getfield(L, l_s("day"), -2);
ts.tm_mon = getfield(L, l_s("month"), -2)-1;
ts.tm_year = getfield(L, l_s("year"), -2)-1900;
ts.tm_isdst = getfield(L, l_s("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 l_char *const catnames[] = {l_s("all"), l_s("collate"), l_s("ctype"), l_s("monetary"),
l_s("numeric"), l_s("time"), NULL};
int op = luaL_findstring(luaL_opt_string(L, 2, l_s("all")), catnames);
luaL_arg_check(L, op != -1, 2, l_s("invalid option"));
lua_pushstring(L, setlocale(cat[op], luaL_check_string(L, 1)));
return 1;
}
static int io_exit (lua_State *L) {
exit(luaL_opt_int(L, 1, EXIT_SUCCESS));
return 0; /* to avoid warnings */
}
/* }====================================================== */
static int io_debug (lua_State *L) {
for (;;) {
l_char buffer[250];
fprintf(stderr, l_s("lua_debug> "));
if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
strcmp(buffer, l_s("cont\n")) == 0)
return 0;
lua_dostring(L, buffer);
lua_settop(L, 0); /* remove eventual returns */
}
}
#define LEVELS1 12 /* size of the first part of the stack */
#define LEVELS2 10 /* size of the second part of the stack */
static int errorfb (lua_State *L) {
int level = 1; /* skip level 0 (it's this function) */
int firstpart = 1; /* still before eventual `...' */
lua_Debug ar;
luaL_Buffer b;
luaL_buffinit(L, &b);
luaL_addstring(&b, l_s("error: "));
luaL_addstring(&b, luaL_check_string(L, 1));
luaL_addstring(&b, l_s("\n"));
while (lua_getstack(L, level++, &ar)) {
l_char buff[120]; /* enough to fit following `sprintf's */
if (level == 2)
luaL_addstring(&b, l_s("stack traceback:\n"));
else if (level > LEVELS1 && firstpart) {
/* no more than `LEVELS2' more levels? */
if (!lua_getstack(L, level+LEVELS2, &ar))
level--; /* keep going */
else {
luaL_addstring(&b, l_s(" ...\n")); /* too many levels */
while (lua_getstack(L, level+LEVELS2, &ar)) /* find last levels */
level++;
}
firstpart = 0;
continue;
}
sprintf(buff, l_s("%4d: "), level-1);
luaL_addstring(&b, buff);
lua_getinfo(L, l_s("Snl"), &ar);
switch (*ar.namewhat) {
case l_c('g'): case l_c('l'): /* global, local */
sprintf(buff, l_s("function `%.50s'"), ar.name);
break;
case l_c('f'): /* field */
sprintf(buff, l_s("method `%.50s'"), ar.name);
break;
case l_c('t'): /* tag method */
sprintf(buff, l_s("`%.50s' tag method"), ar.name);
break;
default: {
if (*ar.what == l_c('m')) /* main? */
sprintf(buff, l_s("main of %.70s"), ar.short_src);
else if (*ar.what == l_c('C')) /* C function? */
sprintf(buff, l_s("%.70s"), ar.short_src);
else
sprintf(buff, l_s("function <%d:%.70s>"), ar.linedefined, ar.short_src);
ar.source = NULL; /* do not print source again */
}
}
luaL_addstring(&b, buff);
if (ar.currentline > 0) {
sprintf(buff, l_s(" at line %d"), ar.currentline);
luaL_addstring(&b, buff);
}
if (ar.source) {
sprintf(buff, l_s(" [%.70s]"), ar.short_src);
luaL_addstring(&b, buff);
}
luaL_addstring(&b, l_s("\n"));
}
luaL_pushresult(&b);
lua_getglobal(L, l_s(LUA_ALERT));
if (lua_isfunction(L, -1)) { /* avoid loop if _ALERT is not defined */
lua_pushvalue(L, -2); /* error message */
lua_rawcall(L, 1, 0);
}
return 0;
}
static const luaL_reg iolib[] = {
{l_s("appendto"), io_appendto},
{l_s("clock"), io_clock},
{l_s("closefile"), io_close},
{l_s("date"), io_date},
{l_s("debug"), io_debug},
{l_s("difftime"), io_difftime},
{l_s("execute"), io_execute},
{l_s("exit"), io_exit},
{l_s("flush"), io_flush},
{l_s("getenv"), io_getenv},
{l_s("openfile"), io_open},
{l_s("read"), io_read},
{l_s("readfrom"), io_readfrom},
{l_s("remove"), io_remove},
{l_s("rename"), io_rename},
{l_s("seek"), io_seek},
{l_s("setlocale"), io_setloc},
{l_s("time"), io_time},
{l_s("tmpfile"), io_tmpfile},
{l_s("tmpname"), io_tmpname},
{l_s("write"), io_write},
{l_s("writeto"), io_writeto},
{l_s(LUA_ERRORMESSAGE), errorfb}
};
LUALIB_API int lua_iolibopen (lua_State *L) {
int iotag = lua_newxtype(L, FILEHANDLE, LUA_TUSERDATA);
lua_newxtype(L, CLOSEDFILEHANDLE, LUA_TUSERDATA);
luaL_openl(L, iolib);
/* predefined file handles */
newfilewithname(L, stdin, basicfiles[INFILE]);
newfilewithname(L, stdout, basicfiles[OUTFILE]);
newfilewithname(L, stderr, l_s("_STDERR"));
resetfile(L, INFILE);
resetfile(L, OUTFILE);
/* close files when collected */
lua_pushcfunction(L, file_collect);
lua_settagmethod(L, iotag, l_s("gc"));
return 0;
}
Reference in New Issue View Git Blame Copy Permalink