mirror of https://github.com/lua/lua
449 lines
9.4 KiB
C
449 lines
9.4 KiB
C
/*
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** $Id: liolib.c,v 1.20 1998/06/05 22:17:44 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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#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 2
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#define IOTAG 1
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#define FIRSTARG 3 /* 1st and 2nd are upvalues */
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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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#else
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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 int gettag (int i)
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{
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return lua_getnumber(lua_getparam(i));
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}
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static void pushresult (int i)
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{
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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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}
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}
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static int ishandler (lua_Object f)
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{
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if (lua_isuserdata(f)) {
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if (lua_tag(f) == gettag(CLOSEDTAG))
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lua_error("cannot access a closed file");
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return lua_tag(f) == gettag(IOTAG);
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}
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else return 0;
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}
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static FILE *getfile (char *name)
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{
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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 *getfileparam (char *name, int *arg)
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{
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lua_Object f = lua_getparam(*arg);
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if (ishandler(f)) {
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(*arg)++;
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return lua_getuserdata(f);
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}
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else
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return getfile(name);
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}
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static void closefile (char *name)
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{
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FILE *f = getfile(name);
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if (f == stdin || f == stdout) return;
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if (pclose(f) == -1)
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fclose(f);
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lua_pushobject(lua_getglobal(name));
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lua_settag(gettag(CLOSEDTAG));
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}
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static void setfile (FILE *f, char *name, int tag)
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{
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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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{
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int tag = gettag(IOTAG);
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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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{
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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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closefile(FINPUT);
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current = stdin;
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}
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else if (lua_tag(f) == gettag(IOTAG))
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current = lua_getuserdata(f);
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else {
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char *s = luaL_check_string(FIRSTARG);
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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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{
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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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closefile(FOUTPUT);
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current = stdout;
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}
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else if (lua_tag(f) == gettag(IOTAG))
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current = lua_getuserdata(f);
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else {
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char *s = luaL_check_string(FIRSTARG);
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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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{
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char *s = luaL_check_string(FIRSTARG);
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FILE *fp = fopen (s, "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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#define NEED_OTHER (EOF-1) /* just some flag different from EOF */
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static void read_until (FILE *f, int lim) {
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int l = 0;
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int c;
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for (c = getc(f); c != EOF && c != lim; c = getc(f)) {
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luaL_addchar(c);
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l++;
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}
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if (l > 0 || c == lim) /* read anything? */
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lua_pushlstring(luaL_buffer(), l);
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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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char *p = luaL_opt_string(arg, NULL);
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luaL_resetbuffer();
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if (p == NULL) /* default: read a line */
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read_until(f, '\n');
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else if (p[0] == '.' && p[1] == '*' && p[2] == 0) /* p = ".*" */
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read_until(f, EOF);
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else {
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int l = 0; /* number of chars read in buffer */
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int inskip = 0; /* to control {skips} */
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int c = NEED_OTHER;
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while (*p) {
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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 == 0)
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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 == NEED_OTHER) c = getc(f);
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if (c == EOF) {
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luaI_singlematch(0, p, &ep); /* to set "ep" */
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m = 0;
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}
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else {
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m = luaI_singlematch(c, p, &ep);
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if (m) {
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if (inskip == 0) {
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luaL_addchar(c);
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l++;
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}
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c = NEED_OTHER;
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}
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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) p = ep; /* continues reading the pattern */
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else
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goto break_while; /* pattern fails */
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}
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}
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}
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} break_while:
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if (c >= 0) /* not EOF nor NEED_OTHER? */
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ungetc(c, f);
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if (l > 0 || *p == 0) /* read something or did not fail? */
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lua_pushlstring(luaL_buffer(), l);
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}
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}
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static void io_write (void)
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{
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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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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 && (fwrite(s, 1, l, f) == l);
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pushresult(status);
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}
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static void io_execute (void)
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{
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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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{
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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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{
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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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{
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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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{
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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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{
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time_t t;
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struct tm *tm;
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char *s = luaL_opt_string(1, "%c");
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char b[BUFSIZ];
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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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{
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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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{
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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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static void io_debug (void)
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{
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while (1) {
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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) return;
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if (strcmp(buffer, "cont\n") == 0) return;
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lua_dostring(buffer);
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}
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}
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static void lua_printstack (FILE *f)
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{
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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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while ((func = lua_stackedfunction(level++)) != LUA_NOOBJECT) {
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char *name;
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int currentline;
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char *filename;
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int linedefined;
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lua_funcinfo(func, &filename, &linedefined);
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fprintf(f, (level==2) ? "Active Stack:\n\t" : "\t");
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switch (*lua_getobjname(func, &name)) {
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case 'g':
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fprintf(f, "function %s", name);
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break;
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case 't':
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fprintf(f, "`%s' tag method", name);
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break;
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default: {
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if (linedefined == 0)
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fprintf(f, "main of %s", filename);
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else if (linedefined < 0)
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fprintf(f, "%s", filename);
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else
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fprintf(f, "function (%s:%d)", filename, linedefined);
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filename = NULL;
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}
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}
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if ((currentline = lua_currentline(func)) > 0)
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fprintf(f, " at line %d", currentline);
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if (filename)
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fprintf(f, " [in file %s]", filename);
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fprintf(f, "\n");
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}
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}
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static void errorfb (void)
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{
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fprintf(stderr, "lua: %s\n", lua_getstring(lua_getparam(1)));
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lua_printstack(stderr);
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}
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static struct luaL_reg iolib[] = {
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{"setlocale", setloc},
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{"execute", io_execute},
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{"remove", io_remove},
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{"rename", io_rename},
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{"tmpname", io_tmpname},
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{"getenv", io_getenv},
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{"date", io_date},
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{"clock", io_clock},
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{"exit", io_exit},
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{"debug", io_debug},
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{"print_stack", errorfb}
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};
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static struct luaL_reg iolibtag[] = {
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{"readfrom", io_readfrom},
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{"writeto", io_writeto},
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{"appendto", io_appendto},
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{"read", io_read},
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{"write", io_write}
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};
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static void openwithtags (void)
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{
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int iotag = lua_newtag();
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int closedtag = lua_newtag();
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int i;
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for (i=0; i<sizeof(iolibtag)/sizeof(iolibtag[0]); i++) {
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/* put both tags as upvalues for these functions */
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lua_pushnumber(iotag);
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lua_pushnumber(closedtag);
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lua_pushcclosure(iolibtag[i].func, 2);
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lua_setglobal(iolibtag[i].name);
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}
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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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}
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void lua_iolibopen (void)
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{
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luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
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openwithtags();
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lua_pushcfunction(errorfb);
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lua_seterrormethod();
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}
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