mirror of
https://github.com/lua/lua
synced 2024-11-30 08:33:16 +03:00
638 lines
15 KiB
C
638 lines
15 KiB
C
/*
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** $Id: liolib.c,v 1.49 1999/10/26 11:00:12 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 <ctype.h>
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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 IOTAG 1
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#define FIRSTARG 2 /* 1st is upvalue */
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#define CLOSEDTAG(tag) ((tag)-1) /* assume that CLOSEDTAG = iotag-1 */
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#define FINPUT "_INPUT"
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#define FOUTPUT "_OUTPUT"
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#ifdef POPEN
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/* FILE *popen();
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int pclose(); */
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#define CLOSEFILE(f) ((pclose(f) == -1) ? fclose(f) : 0)
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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 CLOSEFILE(f) (fclose(f))
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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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return (int)lua_getnumber(lua_getparam(IOTAG));
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}
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static int ishandle (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 (const char *name) {
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lua_Object f = lua_rawgetglobal(name);
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if (!ishandle(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 (ishandle(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 handle");
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return f;
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}
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static FILE *getfileparam (const 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 int closefile (FILE *f) {
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if (f == stdin || f == stdout)
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return 1;
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else {
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int tag = gettag();
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lua_pushusertag(f, tag);
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lua_settag(CLOSEDTAG(tag));
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return (CLOSEFILE(f) == 0);
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}
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}
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static void io_close (void) {
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pushresult(closefile(getnonullfile(FIRSTARG)));
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}
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static void gc_close (void) {
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FILE *f = getnonullfile(FIRSTARG);
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if (f != stdin && f != stdout && f != stderr) {
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CLOSEFILE(f);
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}
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}
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static void io_open (void) {
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FILE *f = fopen(luaL_check_string(FIRSTARG), luaL_check_string(FIRSTARG+1));
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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, const 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, const char *name) {
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if (f == NULL)
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pushresult(0);
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else {
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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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}
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static void io_readfrom (void) {
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FILE *current;
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lua_Object f = lua_getparam(FIRSTARG);
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if (f == LUA_NOOBJECT) {
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if (closefile(getfilebyname(FINPUT)))
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current = stdin;
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else
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current = NULL; /* to signal error */
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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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const char *s = luaL_check_string(FIRSTARG);
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current = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
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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(FIRSTARG);
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if (f == LUA_NOOBJECT) {
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if (closefile(getfilebyname(FOUTPUT)))
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current = stdout;
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else
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current = NULL; /* to signal error */
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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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const char *s = luaL_check_string(FIRSTARG);
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current = (*s == '|') ? popen(s+1,"w") : fopen(s, "w");
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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 *current = fopen(luaL_check_string(FIRSTARG), "a");
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setreturn(current, FOUTPUT);
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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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#ifdef COMPAT_READPATTERN
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/*
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** We cannot lookahead without need, because this can lock stdin.
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** This flag signals when we need to read a next char.
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*/
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#define NEED_OTHER (EOF-1) /* just some flag different from EOF */
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static int read_pattern (FILE *f, const char *p) {
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int inskip = 0; /* {skip} level */
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int c = NEED_OTHER;
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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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const char *ep = luaI_classend(p); /* get what is next */
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int m; /* match result */
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if (c == NEED_OTHER) c = getc(f);
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m = (c==EOF) ? 0 : luaI_singlematch(c, p, ep);
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if (m) {
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if (!inskip) luaL_addchar(c);
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c = NEED_OTHER;
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}
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switch (*ep) {
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case '+': /* repetition (1 or more) */
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if (!m) goto break_while; /* pattern fails? */
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/* else go through */
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case '*': /* repetition (0 or more) */
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while (m) { /* reads the same item until it fails */
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c = getc(f);
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m = (c==EOF) ? 0 : luaI_singlematch(c, p, ep);
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if (m && !inskip) luaL_addchar(c);
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}
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/* go through to continue reading the pattern */
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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) goto break_while; /* pattern fails? */
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p = ep; /* else continues reading the pattern */
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}
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}
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}
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} break_while:
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if (c != NEED_OTHER) ungetc(c, f);
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return (*p == '\0');
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}
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#else
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#define read_pattern(f,p) (lua_error("read patterns are deprecated"), 0)
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#endif
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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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static void read_word (FILE *f) {
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int c;
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do { c = fgetc(f); } while isspace(c); /* skip spaces */
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while (c != EOF && !isspace(c)) {
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luaL_addchar(c);
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c = fgetc(f);
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}
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ungetc(c, f);
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}
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#define HUNK_LINE 256
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#define HUNK_FILE BUFSIZ
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static int read_line (FILE *f) {
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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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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 int read_chars (FILE *f, int n) {
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char *b = luaL_openspace(n);
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int n1 = fread(b, sizeof(char), n, f);
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luaL_addsize(n1);
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return (n == n1);
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}
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static void io_read (void) {
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int arg = FIRSTARG;
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FILE *f = getfileparam(FINPUT, &arg);
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lua_Object op = lua_getparam(arg);
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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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if (lua_isnumber(op))
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success = read_chars(f, (int)lua_getnumber(op));
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else {
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const char *p = luaL_opt_string(arg, "*l");
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if (p[0] != '*')
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success = read_pattern(f, p); /* deprecated! */
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else {
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switch (p[1]) {
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case 'n': /* 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 'l': /* line */
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success = read_line(f);
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break;
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case 'a': /* 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 'w': /* word */
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read_word(f);
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success = 0; /* must read something to succeed */
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break;
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default:
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luaL_argerror(arg, "invalid format");
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success = 0; /* to avoid warnings */
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}
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}
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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 ((op = lua_getparam(++arg)) != LUA_NOOBJECT);
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}
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/* }====================================================== */
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static void io_write (void) {
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int arg = FIRSTARG;
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FILE *f = getfileparam(FOUTPUT, &arg);
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int status = 1;
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lua_Object o;
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while ((o = lua_getparam(arg++)) != LUA_NOOBJECT) {
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switch (lua_type(o)[2]) {
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case 'r': { /* stRing? */
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long l = lua_strlen(o);
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status = status &&
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((long)fwrite(lua_getstring(o), sizeof(char), l, f) == l);
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break;
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}
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case 'm': /* nuMber? */ /* LUA_NUMBER */
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/* optimization: could be done exactly as for strings */
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status = status && fprintf(f, "%.16g", lua_getnumber(o)) > 0;
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break;
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default: luaL_argerror(arg-1, "string expected");
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}
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}
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pushresult(status);
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}
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static void io_seek (void) {
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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 = getnonullfile(FIRSTARG);
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int op = luaL_findstring(luaL_opt_string(FIRSTARG+1, "cur"), modenames);
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long offset = luaL_opt_long(FIRSTARG+2, 0);
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luaL_arg_check(op != -1, FIRSTARG+1, "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(FIRSTARG);
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luaL_arg_check(f || lua_getparam(FIRSTARG) == LUA_NOOBJECT, FIRSTARG,
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"invalid file handle");
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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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const 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 const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
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LC_NUMERIC, LC_TIME};
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static const char *const 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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exit(luaL_opt_int(1, EXIT_SUCCESS));
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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 60
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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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const char *name;
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int currentline;
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const 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, " ");
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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 %.70s", buffchunk);
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else if (linedefined < 0)
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sprintf(buff+strlen(buff), "%.70s", buffchunk);
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else
|
|
sprintf(buff+strlen(buff), "function <%d:%.70s>",
|
|
linedefined, buffchunk);
|
|
chunkname = NULL;
|
|
}
|
|
}
|
|
if ((currentline = lua_currentline(func)) > 0)
|
|
sprintf(buff+strlen(buff), " at line %d", currentline);
|
|
if (chunkname)
|
|
sprintf(buff+strlen(buff), " [%.70s]", buffchunk);
|
|
strcat(buff, "\n");
|
|
}
|
|
func = lua_rawgetglobal("_ALERT");
|
|
if (lua_isfunction(func)) { /* avoid error loop if _ALERT is not defined */
|
|
lua_pushstring(buff);
|
|
lua_callfunction(func);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static const struct luaL_reg iolib[] = {
|
|
{"_ERRORMESSAGE", errorfb},
|
|
{"clock", io_clock},
|
|
{"date", io_date},
|
|
{"debug", io_debug},
|
|
{"execute", io_execute},
|
|
{"exit", io_exit},
|
|
{"getenv", io_getenv},
|
|
{"remove", io_remove},
|
|
{"rename", io_rename},
|
|
{"setlocale", setloc},
|
|
{"tmpname", io_tmpname}
|
|
};
|
|
|
|
|
|
static const struct luaL_reg iolibtag[] = {
|
|
{"appendto", io_appendto},
|
|
{"closefile", io_close},
|
|
{"flush", io_flush},
|
|
{"openfile", io_open},
|
|
{"read", io_read},
|
|
{"readfrom", io_readfrom},
|
|
{"seek", io_seek},
|
|
{"write", io_write},
|
|
{"writeto", io_writeto}
|
|
};
|
|
|
|
|
|
static void openwithtags (void) {
|
|
unsigned int i;
|
|
int iotag = lua_newtag();
|
|
lua_newtag(); /* alloc CLOSEDTAG: assume that CLOSEDTAG = iotag-1 */
|
|
for (i=0; i<sizeof(iolibtag)/sizeof(iolibtag[0]); i++) {
|
|
/* put iotag as upvalue for these functions */
|
|
lua_pushnumber(iotag);
|
|
lua_pushcclosure(iolibtag[i].func, 1);
|
|
lua_setglobal(iolibtag[i].name);
|
|
}
|
|
/* predefined file handles */
|
|
setfile(stdin, FINPUT, iotag);
|
|
setfile(stdout, FOUTPUT, iotag);
|
|
setfile(stdin, "_STDIN", iotag);
|
|
setfile(stdout, "_STDOUT", iotag);
|
|
setfile(stderr, "_STDERR", iotag);
|
|
/* close file when collected */
|
|
lua_pushnumber(iotag);
|
|
lua_pushcclosure(gc_close, 1);
|
|
lua_settagmethod(iotag, "gc");
|
|
}
|
|
|
|
void lua_iolibopen (void) {
|
|
/* register lib functions */
|
|
luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
|
|
openwithtags();
|
|
}
|
|
|