mirror of
https://github.com/lua/lua
synced 2024-11-26 14:51:21 +03:00
558 lines
13 KiB
C
558 lines
13 KiB
C
/*
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** $Id: liolib.c,v 1.34 1999/03/11 18:59:19 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 <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 "lauxlib.h"
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#include "lua.h"
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#include "luadebug.h"
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#include "lualib.h"
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#ifndef OLD_ANSI
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#include <locale.h>
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#else
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/* no support for locale and for strerror: fake them */
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#define setlocale(a,b) 0
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#define LC_ALL 0
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#define LC_COLLATE 0
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#define LC_CTYPE 0
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#define LC_MONETARY 0
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#define LC_NUMERIC 0
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#define LC_TIME 0
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#define strerror(e) "(no error message provided by operating system)"
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#endif
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#define CLOSEDTAG(tag) ((tag)-1)
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#define FINPUT "_INPUT"
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#define FOUTPUT "_OUTPUT"
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#define MODESIZE 3 /* string for file mode */
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#ifdef POPEN
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FILE *popen();
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int pclose();
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#else
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/* no support for popen */
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#define popen(x,y) NULL /* that is, popen always fails */
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#define pclose(x) (-1)
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#endif
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static void pushresult (int i) {
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if (i)
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lua_pushuserdata(NULL);
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else {
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lua_pushnil();
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lua_pushstring(strerror(errno));
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lua_pushnumber(errno);
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}
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}
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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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static int gettag (void) {
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lua_pushusertag(stdin, LUA_ANYTAG);
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return lua_tag(lua_pop()); /* get the tag of stdin */
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}
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static int ishandler (lua_Object f) {
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if (lua_isuserdata(f)) {
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int tag = gettag();
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if (lua_tag(f) == CLOSEDTAG(tag))
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lua_error("cannot access a closed file");
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return lua_tag(f) == tag;
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}
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else return 0;
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}
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static FILE *getfilebyname (char *name) {
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lua_Object f = lua_getglobal(name);
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if (!ishandler(f))
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luaL_verror("global variable `%.50s' is not a file handle", name);
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return lua_getuserdata(f);
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}
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static FILE *getfile (int arg) {
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lua_Object f = lua_getparam(arg);
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return (ishandler(f)) ? lua_getuserdata(f) : NULL;
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}
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static FILE *getnonullfile (int arg) {
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FILE *f = getfile(arg);
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luaL_arg_check(f, arg, "invalid file handler");
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return f;
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}
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static FILE *getfileparam (char *name, int *arg) {
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FILE *f = getfile(*arg);
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if (f) {
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(*arg)++;
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return f;
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}
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else
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return getfilebyname(name);
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}
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static void closefile (FILE *f) {
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if (f != stdin && f != stdout) {
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int tag = gettag();
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if (pclose(f) == -1)
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fclose(f);
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lua_pushusertag(f, tag);
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lua_settag(CLOSEDTAG(tag));
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}
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}
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static void io_close (void) {
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closefile(getnonullfile(1));
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}
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static void io_open (void) {
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FILE *f = fopen(luaL_check_string(1), luaL_check_string(2));
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if (f) lua_pushusertag(f, gettag());
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else pushresult(0);
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}
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static void setfile (FILE *f, char *name, int tag) {
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lua_pushusertag(f, tag);
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lua_setglobal(name);
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}
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static void setreturn (FILE *f, char *name) {
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int tag = gettag();
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setfile(f, name, tag);
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lua_pushusertag(f, tag);
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}
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static void io_readfrom (void) {
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FILE *current;
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lua_Object f = lua_getparam(1);
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if (f == LUA_NOOBJECT) {
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closefile(getfilebyname(FINPUT));
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current = stdin;
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}
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else if (lua_tag(f) == gettag()) /* deprecated option */
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current = lua_getuserdata(f);
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else {
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char *s = luaL_check_string(1);
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current = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
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if (current == NULL) {
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pushresult(0);
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return;
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}
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}
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setreturn(current, FINPUT);
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}
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static void io_writeto (void) {
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FILE *current;
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lua_Object f = lua_getparam(1);
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if (f == LUA_NOOBJECT) {
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closefile(getfilebyname(FOUTPUT));
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current = stdout;
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}
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else if (lua_tag(f) == gettag()) /* deprecated option */
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current = lua_getuserdata(f);
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else {
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char *s = luaL_check_string(1);
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current = (*s == '|') ? popen(s+1,"w") : fopen(s, "w");
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if (current == NULL) {
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pushresult(0);
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return;
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}
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}
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setreturn(current, FOUTPUT);
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}
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static void io_appendto (void) {
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FILE *fp = fopen(luaL_check_string(1), "a");
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if (fp != NULL)
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setreturn(fp, FOUTPUT);
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else
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pushresult(0);
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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_pattern (FILE *f, char *p) {
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int inskip = 0; /* {skip} level */
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int c = getc(f);
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while (*p != '\0') {
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switch (*p) {
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case '{':
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inskip++;
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p++;
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continue;
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case '}':
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if (!inskip) lua_error("unbalanced braces in read pattern");
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inskip--;
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p++;
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continue;
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default: {
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char *ep; /* get what is next */
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int m; /* match result */
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if (c != EOF)
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m = luaI_singlematch(c, p, &ep);
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else {
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luaI_singlematch(0, p, &ep); /* to set "ep" */
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m = 0; /* EOF matches no pattern */
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}
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if (m) {
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if (!inskip) luaL_addchar(c);
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c = getc(f);
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}
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switch (*ep) {
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case '*': /* repetition */
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if (!m) p = ep+1; /* else stay in (repeat) the same item */
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continue;
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case '?': /* optional */
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p = ep+1; /* continues reading the pattern */
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continue;
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default:
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if (!m) { /* pattern fails? */
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ungetc(c, f);
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return 0;
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}
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p = ep; /* continues reading the pattern */
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}
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}
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}
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}
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ungetc(c, f);
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return 1;
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}
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static int read_number (FILE *f) {
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double d;
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if (fscanf(f, "%lf", &d) == 1) {
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lua_pushnumber(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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#define HUNK_LINE 1024
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#define HUNK_FILE BUFSIZ
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static int read_line (FILE *f) {
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/* equivalent to: return read_pattern(f, "[^\n]*{\n}"); */
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int n;
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char *b;
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do {
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b = luaL_openspace(HUNK_LINE);
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if (!fgets(b, HUNK_LINE, f)) return 0; /* read fails */
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n = strlen(b);
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luaL_addsize(n);
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} while (b[n-1] != '\n');
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luaL_addsize(-1); /* remove '\n' */
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return 1;
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}
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static void read_file (FILE *f) {
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/* equivalent to: return read_pattern(f, ".*"); */
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int n;
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do {
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char *b = luaL_openspace(HUNK_FILE);
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n = fread(b, sizeof(char), HUNK_FILE, f);
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luaL_addsize(n);
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} while (n==HUNK_FILE);
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}
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static void io_read (void) {
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static char *options[] = {"*n", "*l", "*a", ".*", "*w", NULL};
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int arg = 1;
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FILE *f = getfileparam(FINPUT, &arg);
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char *p = luaL_opt_string(arg++, "*l");
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do { /* repeat for each part */
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long l;
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int success;
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luaL_resetbuffer();
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switch (luaL_findstring(p, options)) {
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case 0: /* number */
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if (!read_number(f)) return; /* read fails */
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continue; /* number is already pushed; avoid the "pushstring" */
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case 1: /* line */
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success = read_line(f);
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break;
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case 2: case 3: /* file */
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read_file(f);
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success = 1; /* always success */
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break;
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case 4: /* word */
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success = read_pattern(f, "{%s*}%S%S*");
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break;
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default:
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success = read_pattern(f, p);
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}
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l = luaL_getsize();
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if (!success && l==0) return; /* read fails */
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lua_pushlstring(luaL_buffer(), l);
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} while ((p = luaL_opt_string(arg++, NULL)) != NULL);
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}
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/* }====================================================== */
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static void io_write (void) {
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int arg = 1;
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FILE *f = getfileparam(FOUTPUT, &arg);
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int status = 1;
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char *s;
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long l;
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while ((s = luaL_opt_lstr(arg++, NULL, &l)) != NULL)
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status = status && ((long)fwrite(s, 1, l, f) == l);
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pushresult(status);
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}
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static void io_seek (void) {
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static int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
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static char *modenames[] = {"set", "cur", "end", NULL};
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FILE *f = getnonullfile(1);
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int op = luaL_findstring(luaL_opt_string(2, "cur"), modenames);
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long offset = luaL_opt_long(3, 0);
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luaL_arg_check(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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pushresult(0); /* error */
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else
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lua_pushnumber(ftell(f));
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}
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static void io_flush (void) {
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FILE *f = getfile(1);
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luaL_arg_check(f || lua_getparam(1) == LUA_NOOBJECT, 1,
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"invalid file handler");
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pushresult(fflush(f) == 0);
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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 void io_execute (void) {
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lua_pushnumber(system(luaL_check_string(1)));
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}
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static void io_remove (void) {
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pushresult(remove(luaL_check_string(1)) == 0);
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}
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static void io_rename (void) {
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pushresult(rename(luaL_check_string(1),
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luaL_check_string(2)) == 0);
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}
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static void io_tmpname (void) {
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lua_pushstring(tmpnam(NULL));
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}
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static void io_getenv (void) {
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lua_pushstring(getenv(luaL_check_string(1))); /* if NULL push nil */
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}
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static void io_clock (void) {
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lua_pushnumber(((double)clock())/CLOCKS_PER_SEC);
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}
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static void io_date (void) {
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char b[256];
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char *s = luaL_opt_string(1, "%c");
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struct tm *tm;
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time_t t;
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time(&t); tm = localtime(&t);
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if (strftime(b,sizeof(b),s,tm))
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lua_pushstring(b);
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else
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lua_error("invalid `date' format");
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}
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static void setloc (void) {
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static int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC,
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LC_TIME};
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static char *catnames[] = {"all", "collate", "ctype", "monetary",
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"numeric", "time", NULL};
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int op = luaL_findstring(luaL_opt_string(2, "all"), catnames);
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luaL_arg_check(op != -1, 2, "invalid option");
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lua_pushstring(setlocale(cat[op], luaL_check_string(1)));
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}
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static void io_exit (void) {
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lua_Object o = lua_getparam(1);
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exit(lua_isnumber(o) ? (int)lua_getnumber(o) : 1);
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}
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/* }====================================================== */
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static void io_debug (void) {
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for (;;) {
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char buffer[250];
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fprintf(stderr, "lua_debug> ");
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if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
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strcmp(buffer, "cont\n") == 0)
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return;
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lua_dostring(buffer);
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}
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}
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#define MESSAGESIZE 150
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#define MAXMESSAGE (MESSAGESIZE*10)
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#define MAXSRC 40
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static void errorfb (void) {
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char buff[MAXMESSAGE];
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int level = 1; /* skip level 0 (it's this function) */
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lua_Object func;
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sprintf(buff, "lua error: %.200s\n", lua_getstring(lua_getparam(1)));
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while ((func = lua_stackedfunction(level++)) != LUA_NOOBJECT) {
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char *name;
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int currentline;
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char *chunkname;
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char buffchunk[MAXSRC];
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int linedefined;
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lua_funcinfo(func, &chunkname, &linedefined);
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luaL_chunkid(buffchunk, chunkname, sizeof(buffchunk));
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if (level == 2) strcat(buff, "Active Stack:\n");
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strcat(buff, "\t");
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if (strlen(buff) > MAXMESSAGE-MESSAGESIZE) {
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strcat(buff, "...\n");
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break; /* buffer is full */
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}
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switch (*lua_getobjname(func, &name)) {
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case 'g':
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sprintf(buff+strlen(buff), "function `%.50s'", name);
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break;
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case 't':
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sprintf(buff+strlen(buff), "`%.50s' tag method", name);
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break;
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default: {
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if (linedefined == 0)
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sprintf(buff+strlen(buff), "main of %.50s", buffchunk);
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else if (linedefined < 0)
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sprintf(buff+strlen(buff), "%.50s", buffchunk);
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else
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sprintf(buff+strlen(buff), "function <%d:%.50s>",
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linedefined, buffchunk);
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chunkname = NULL;
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}
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}
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if ((currentline = lua_currentline(func)) > 0)
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sprintf(buff+strlen(buff), " at line %d", currentline);
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if (chunkname)
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sprintf(buff+strlen(buff), " [%.50s]", buffchunk);
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strcat(buff, "\n");
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}
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func = lua_rawgetglobal("_ALERT");
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if (lua_isfunction(func)) { /* avoid error loop if _ALERT is not defined */
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lua_pushstring(buff);
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lua_callfunction(func);
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}
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}
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static struct luaL_reg iolib[] = {
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{"_ERRORMESSAGE", errorfb},
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{"appendto", io_appendto},
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{"clock", io_clock},
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{"closefile", io_close},
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{"date", io_date},
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{"debug", io_debug},
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{"execute", io_execute},
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{"exit", io_exit},
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{"flush", io_flush},
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{"getenv", io_getenv},
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{"openfile", io_open},
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{"read", io_read},
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{"readfrom", io_readfrom},
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{"remove", io_remove},
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{"rename", io_rename},
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{"seek", io_seek},
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{"setlocale", setloc},
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{"tmpname", io_tmpname},
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{"write", io_write},
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{"writeto", io_writeto}
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};
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void lua_iolibopen (void) {
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int iotag = lua_newtag();
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lua_newtag(); /* alloc CLOSEDTAG: assume that CLOSEDTAG = iotag-1 */
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/* predefined file handles */
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setfile(stdin, FINPUT, iotag);
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setfile(stdout, FOUTPUT, iotag);
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setfile(stdin, "_STDIN", iotag);
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setfile(stdout, "_STDOUT", iotag);
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setfile(stderr, "_STDERR", iotag);
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/* make sure stdin (with its tag) won't be collected */
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lua_pushusertag(stdin, iotag); lua_ref(1);
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/* close file when collected */
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lua_pushcfunction(io_close); lua_settagmethod(iotag, "gc");
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/* register lib functions */
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luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
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}
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