diff options
Diffstat (limited to 'src/lua/liolib.c')
-rw-r--r-- | src/lua/liolib.c | 710 |
1 files changed, 0 insertions, 710 deletions
diff --git a/src/lua/liolib.c b/src/lua/liolib.c deleted file mode 100644 index 4fb385f4..00000000 --- a/src/lua/liolib.c +++ /dev/null @@ -1,710 +0,0 @@ -/* -** $Id: liolib.c,v 1.5 2004/06/04 13:42:10 neil Exp $ -** Standard I/O (and system) library -** See Copyright Notice in lua.h -*/ - - -#include <ctype.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> - -#include "lua.h" - -#include "lauxlib.h" -#include "luadebug.h" -#include "lualib.h" - - -#ifndef OLD_ANSI -#include <errno.h> -#include <locale.h> -#define realloc(b,s) ((b) == NULL ? malloc(s) : (realloc)(b, s)) -#define free(b) if (b) (free)(b) -#else -/* no support for locale and for strerror: fake them */ -#define setlocale(a,b) ((void)a, strcmp((b),"C")==0?"C":NULL) -#define LC_ALL 0 -#define LC_COLLATE 0 -#define LC_CTYPE 0 -#define LC_MONETARY 0 -#define LC_NUMERIC 0 -#define LC_TIME 0 -#define strerror(e) "generic I/O error" -#define errno (-1) -#endif - - - -#ifdef POPEN -/* FILE *popen(); -int pclose(); */ -#define CLOSEFILE(L, f) ((pclose(f) == -1) ? fclose(f) : 0) -#else -/* no support for popen */ -#define popen(x,y) NULL /* that is, popen always fails */ -#define CLOSEFILE(L, f) (fclose(f)) -#endif - - -#define INFILE 0 -#define OUTFILE 1 - -typedef struct IOCtrl { - int ref[2]; /* ref for strings _INPUT/_OUTPUT */ - int iotag; /* tag for file handles */ - int closedtag; /* tag for closed handles */ -} IOCtrl; - - - -static const char *const filenames[] = {"_INPUT", "_OUTPUT"}; - - -static int pushresult (lua_State *L, int i) { - if (i) { - lua_pushuserdata(L, NULL); - return 1; - } - else { - lua_pushnil(L); - lua_pushstring(L, strerror(errno)); - lua_pushnumber(L, errno); - return 3;; - } -} - - -/* -** {====================================================== -** FILE Operations -** ======================================================= -*/ - - -static FILE *gethandle (lua_State *L, IOCtrl *ctrl, int f) { - void *p = lua_touserdata(L, f); - if (p != NULL) { /* is `f' a userdata ? */ - int ftag = lua_tag(L, f); - if (ftag == ctrl->iotag) /* does it have the correct tag? */ - return (FILE *)p; - else if (ftag == ctrl->closedtag) - lua_error(L, "cannot access a closed file"); - /* else go through */ - } - return NULL; -} - - -static FILE *getnonullfile (lua_State *L, IOCtrl *ctrl, int arg) { - FILE *f = gethandle(L, ctrl, arg); - luaL_arg_check(L, f, arg, "invalid file handle"); - return f; -} - - -static FILE *getfilebyref (lua_State *L, IOCtrl *ctrl, int inout) { - FILE *f; - lua_getglobals(L); - lua_getref(L, ctrl->ref[inout]); - lua_rawget(L, -2); - f = gethandle(L, ctrl, -1); - if (f == NULL) - luaL_verror(L, "global variable `%.10s' is not a file handle", - filenames[inout]); - return f; -} - - -static void setfilebyname (lua_State *L, IOCtrl *ctrl, FILE *f, - const char *name) { - lua_pushusertag(L, f, ctrl->iotag); - lua_setglobal(L, name); -} - - -#define setfile(L,ctrl,f,inout) (setfilebyname(L,ctrl,f,filenames[inout])) - - -static int setreturn (lua_State *L, IOCtrl *ctrl, FILE *f, int inout) { - if (f == NULL) - return pushresult(L, 0); - else { - setfile(L, ctrl, f, inout); - lua_pushusertag(L, f, ctrl->iotag); - return 1; - } -} - - -static int closefile (lua_State *L, IOCtrl *ctrl, FILE *f) { - if (f == stdin || f == stdout || f == stderr) - return 1; - else { - lua_pushusertag(L, f, ctrl->iotag); - lua_settag(L, ctrl->closedtag); - return (CLOSEFILE(L, f) == 0); - } -} - - -static int io_close (lua_State *L) { - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - lua_pop(L, 1); /* remove upvalue */ - return pushresult(L, closefile(L, ctrl, getnonullfile(L, ctrl, 1))); -} - - -static int file_collect (lua_State *L) { - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - FILE *f = getnonullfile(L, ctrl, 1); - if (f != stdin && f != stdout && f != stderr) - CLOSEFILE(L, f); - return 0; -} - - -static int io_open (lua_State *L) { - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - FILE *f; - lua_pop(L, 1); /* remove upvalue */ - f = fopen(luaL_check_string(L, 1), luaL_check_string(L, 2)); - if (f) { - lua_pushusertag(L, f, ctrl->iotag); - return 1; - } - else - return pushresult(L, 0); -} - - - -static int io_fromto (lua_State *L, int inout, const char *mode) { - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - FILE *current; - lua_pop(L, 1); /* remove upvalue */ - if (lua_isnull(L, 1)) { - closefile(L, ctrl, getfilebyref(L, ctrl, inout)); - current = (inout == 0) ? stdin : stdout; - } - else if (lua_tag(L, 1) == ctrl->iotag) /* deprecated option */ - current = (FILE *)lua_touserdata(L, 1); - else { - const char *s = luaL_check_string(L, 1); - current = (*s == '|') ? popen(s+1, mode) : fopen(s, mode); - } - return setreturn(L, ctrl, current, inout); -} - - -static int io_readfrom (lua_State *L) { - return io_fromto(L, INFILE, "r"); -} - - -static int io_writeto (lua_State *L) { - return io_fromto(L, OUTFILE, "w"); -} - - -static int io_appendto (lua_State *L) { - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - FILE *current; - lua_pop(L, 1); /* remove upvalue */ - current = fopen(luaL_check_string(L, 1), "a"); - return setreturn(L, ctrl, current, OUTFILE); -} - - - -/* -** {====================================================== -** READ -** ======================================================= -*/ - - - -#ifdef LUA_COMPAT_READPATTERN - -/* -** We cannot lookahead without need, because this can lock stdin. -** This flag signals when we need to read a next char. -*/ -#define NEED_OTHER (EOF-1) /* just some flag different from EOF */ - - -static int read_pattern (lua_State *L, FILE *f, const char *p) { - int inskip = 0; /* {skip} level */ - int c = NEED_OTHER; - luaL_Buffer b; - luaL_buffinit(L, &b); - while (*p != '\0') { - switch (*p) { - case '{': - inskip++; - p++; - continue; - case '}': - if (!inskip) lua_error(L, "unbalanced braces in read pattern"); - inskip--; - p++; - continue; - default: { - const char *ep = luaI_classend(L, p); /* get what is next */ - int m; /* match result */ - if (c == NEED_OTHER) c = getc(f); - m = (c==EOF) ? 0 : luaI_singlematch(c, p, ep); - if (m) { - if (!inskip) luaL_putchar(&b, c); - c = NEED_OTHER; - } - switch (*ep) { - case '+': /* repetition (1 or more) */ - if (!m) goto break_while; /* pattern fails? */ - /* else go through */ - case '*': /* repetition (0 or more) */ - while (m) { /* reads the same item until it fails */ - c = getc(f); - m = (c==EOF) ? 0 : luaI_singlematch(c, p, ep); - if (m && !inskip) luaL_putchar(&b, c); - } - /* go through to continue reading the pattern */ - case '?': /* optional */ - p = ep+1; /* continues reading the pattern */ - continue; - default: - if (!m) goto break_while; /* pattern fails? */ - p = ep; /* else continues reading the pattern */ - } - } - } - } break_while: - if (c != NEED_OTHER) ungetc(c, f); - luaL_pushresult(&b); /* close buffer */ - return (*p == '\0'); -} - -#else - -#define read_pattern(L, f, p) (lua_error(L, "read patterns are deprecated"), 0) - -#endif - - -static int read_number (lua_State *L, FILE *f) { - long d; - if (fscanf(f, "%ld", &d) == 1) { - lua_pushnumber(L, d); - return 1; - } - else return 0; /* read fails */ -} - - -static int read_word (lua_State *L, FILE *f) { - int c; - luaL_Buffer b; - luaL_buffinit(L, &b); - do { c = fgetc(f); } while (isspace(c)); /* skip spaces */ - while (c != EOF && !isspace(c)) { - luaL_putchar(&b, c); - c = fgetc(f); - } - ungetc(c, f); - luaL_pushresult(&b); /* close buffer */ - return (lua_strlen(L, -1) > 0); -} - - -static int read_line (lua_State *L, FILE *f) { - int n = 0; - luaL_Buffer b; - luaL_buffinit(L, &b); - for (;;) { - char *p = luaL_prepbuffer(&b); - if (!fgets(p, LUAL_BUFFERSIZE, f)) /* read fails? */ - break; - n = strlen(p); - if (p[n-1] != '\n') - luaL_addsize(&b, n); - else { - luaL_addsize(&b, n-1); /* do not add the `\n' */ - break; - } - } - luaL_pushresult(&b); /* close buffer */ - return (n > 0); /* read something? */ -} - - -static void read_file (lua_State *L, FILE *f) { - size_t len = 0; - size_t size = BUFSIZ; - char *buffer = NULL; - for (;;) { - char *newbuffer = (char *)realloc(buffer, size); - if (newbuffer == NULL) { - free(buffer); - lua_error(L, "not enough memory to read a file"); - } - buffer = newbuffer; - len += fread(buffer+len, sizeof(char), size-len, f); - if (len < size) break; /* did not read all it could */ - size *= 2; - } - lua_pushlstring(L, buffer, len); - free(buffer); -} - - -static int read_chars (lua_State *L, FILE *f, size_t n) { - char *buffer; - size_t n1; - char statbuff[BUFSIZ]; - if (n <= BUFSIZ) - buffer = statbuff; - else { - buffer = (char *)malloc(n); - if (buffer == NULL) - lua_error(L, "not enough memory to read a file"); - } - n1 = fread(buffer, sizeof(char), n, f); - lua_pushlstring(L, buffer, n1); - if (buffer != statbuff) free(buffer); - return (n1 > 0 || n == 0); -} - - -static int io_read (lua_State *L) { - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - int lastarg = lua_gettop(L) - 1; - int firstarg = 1; - FILE *f = gethandle(L, ctrl, firstarg); - int n; - if (f) firstarg++; - else f = getfilebyref(L, ctrl, INFILE); /* get _INPUT */ - lua_pop(L, 1); - if (firstarg > lastarg) { /* no arguments? */ - lua_settop(L, 0); /* erase upvalue and other eventual garbage */ - firstarg = lastarg = 1; /* correct indices */ - lua_pushstring(L, "*l"); /* push default argument */ - } - else /* ensure stack space for all results and for auxlib's buffer */ - luaL_checkstack(L, lastarg-firstarg+1+LUA_MINSTACK, "too many arguments"); - for (n = firstarg; n<=lastarg; n++) { - int success; - if (lua_isnumber(L, n)) - success = read_chars(L, f, (size_t)lua_tonumber(L, n)); - else { - const char *p = luaL_check_string(L, n); - if (p[0] != '*') - success = read_pattern(L, f, p); /* deprecated! */ - else { - switch (p[1]) { - case 'n': /* number */ - if (!read_number(L, f)) goto endloop; /* read fails */ - continue; /* number is already pushed; avoid the "pushstring" */ - case 'l': /* line */ - success = read_line(L, f); - break; - case 'a': /* file */ - read_file(L, f); - success = 1; /* always success */ - break; - case 'w': /* word */ - success = read_word(L, f); - break; - default: - luaL_argerror(L, n, "invalid format"); - success = 0; /* to avoid warnings */ - } - } - } - if (!success) { - lua_pop(L, 1); /* remove last result */ - break; /* read fails */ - } - } endloop: - return n - firstarg; -} - -/* }====================================================== */ - - -static int io_write (lua_State *L) { - int lastarg = lua_gettop(L) - 1; - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - int arg = 1; - int status = 1; - FILE *f = gethandle(L, ctrl, arg); - if (f) arg++; - else f = getfilebyref(L, ctrl, OUTFILE); /* get _OUTPUT */ - for (; arg <= lastarg; arg++) { - if (lua_type(L, arg) == LUA_TNUMBER) { /* LUA_NUMBER */ - /* optimization: could be done exactly as for strings */ - status = status && fprintf(f, "%ld", lua_tonumber(L, arg)) > 0; - } - else { - size_t l; - const char *s = luaL_check_lstr(L, arg, &l); - status = status && (fwrite(s, sizeof(char), l, f) == l); - } - } - pushresult(L, status); - return 1; -} - - -static int io_seek (lua_State *L) { - static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END}; - static const char *const modenames[] = {"set", "cur", "end", NULL}; - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - FILE *f; - int op; - long offset; - lua_pop(L, 1); /* remove upvalue */ - f = getnonullfile(L, ctrl, 1); - op = luaL_findstring(luaL_opt_string(L, 2, "cur"), modenames); - offset = luaL_opt_long(L, 3, 0); - luaL_arg_check(L, op != -1, 2, "invalid mode"); - op = fseek(f, offset, mode[op]); - if (op) - return pushresult(L, 0); /* error */ - else { - lua_pushnumber(L, ftell(f)); - return 1; - } -} - - -static int io_flush (lua_State *L) { - IOCtrl *ctrl = (IOCtrl *)lua_touserdata(L, -1); - FILE *f; - lua_pop(L, 1); /* remove upvalue */ - f = gethandle(L, ctrl, 1); - luaL_arg_check(L, f || lua_isnull(L, 1), 1, "invalid file handle"); - return pushresult(L, fflush(f) == 0); -} - -/* }====================================================== */ - - -/* -** {====================================================== -** Other O.S. Operations -** ======================================================= -*/ - -static int io_execute (lua_State *L) { - lua_pushnumber(L, system(luaL_check_string(L, 1))); - return 1; -} - - -static int io_remove (lua_State *L) { - return pushresult(L, remove(luaL_check_string(L, 1)) == 0); -} - - -static int io_rename (lua_State *L) { - return pushresult(L, rename(luaL_check_string(L, 1), - luaL_check_string(L, 2)) == 0); -} - - -static int io_getenv (lua_State *L) { - lua_pushstring(L, getenv(luaL_check_string(L, 1))); /* if NULL push nil */ - return 1; -} - - -static int io_clock (lua_State *L) { - lua_pushnumber(L, ((long)clock())/CLOCKS_PER_SEC); - return 1; -} - - -static int io_date (lua_State *L) { - char b[256]; - const char *s = luaL_opt_string(L, 1, "%c"); - struct tm *stm; - time_t t; - time(&t); stm = localtime(&t); - if (strftime(b, sizeof(b), s, stm)) - lua_pushstring(L, b); - else - lua_error(L, "invalid `date' format"); - return 1; -} - - -static int setloc (lua_State *L) { - static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, - LC_NUMERIC, LC_TIME}; - static const char *const catnames[] = {"all", "collate", "ctype", "monetary", - "numeric", "time", NULL}; - int op = luaL_findstring(luaL_opt_string(L, 2, "all"), catnames); - luaL_arg_check(L, op != -1, 2, "invalid option"); - lua_pushstring(L, setlocale(cat[op], luaL_check_string(L, 1))); - return 1; -} - - -static int io_exit (lua_State *L) { - exit(luaL_opt_int(L, 1, EXIT_SUCCESS)); - return 0; /* to avoid warnings */ -} - -/* }====================================================== */ - - - -static int io_debug (lua_State *L) { - for (;;) { - char buffer[250]; - fprintf(stderr, "lua_debug> "); - if (fgets(buffer, sizeof(buffer), stdin) == 0 || - strcmp(buffer, "cont\n") == 0) - return 0; - lua_dostring(L, buffer); - lua_settop(L, 0); /* remove eventual returns */ - } -} - - -#define LEVELS1 12 /* size of the first part of the stack */ -#define LEVELS2 10 /* size of the second part of the stack */ - -static int errorfb (lua_State *L) { - int level = 1; /* skip level 0 (it's this function) */ - int firstpart = 1; /* still before eventual `...' */ - lua_Debug ar; - luaL_Buffer b; - luaL_buffinit(L, &b); - luaL_addstring(&b, "error: "); - luaL_addstring(&b, luaL_check_string(L, 1)); - luaL_addstring(&b, "\n"); - while (lua_getstack(L, level++, &ar)) { - char buff[120]; /* enough to fit following `sprintf's */ - if (level == 2) - luaL_addstring(&b, "stack traceback:\n"); - else if (level > LEVELS1 && firstpart) { - /* no more than `LEVELS2' more levels? */ - if (!lua_getstack(L, level+LEVELS2, &ar)) - level--; /* keep going */ - else { - luaL_addstring(&b, " ...\n"); /* too many levels */ - while (lua_getstack(L, level+LEVELS2, &ar)) /* find last levels */ - level++; - } - firstpart = 0; - continue; - } - sprintf(buff, "%4d: ", level-1); - luaL_addstring(&b, buff); - lua_getinfo(L, "Snl", &ar); - switch (*ar.namewhat) { - case 'g': case 'l': /* global, local */ - sprintf(buff, "function `%.50s'", ar.name); - break; - case 'f': /* field */ - sprintf(buff, "method `%.50s'", ar.name); - break; - case 't': /* tag method */ - sprintf(buff, "`%.50s' tag method", ar.name); - break; - default: { - if (*ar.what == 'm') /* main? */ - sprintf(buff, "main of %.70s", ar.short_src); - else if (*ar.what == 'C') /* C function? */ - sprintf(buff, "%.70s", ar.short_src); - else - sprintf(buff, "function <%d:%.70s>", ar.linedefined, ar.short_src); - ar.source = NULL; /* do not print source again */ - } - } - luaL_addstring(&b, buff); - if (ar.currentline > 0) { - sprintf(buff, " at line %d", ar.currentline); - luaL_addstring(&b, buff); - } - if (ar.source) { - sprintf(buff, " [%.70s]", ar.short_src); - luaL_addstring(&b, buff); - } - luaL_addstring(&b, "\n"); - } - luaL_pushresult(&b); - lua_getglobal(L, LUA_ALERT); - if (lua_isfunction(L, -1)) { /* avoid loop if _ALERT is not defined */ - lua_pushvalue(L, -2); /* error message */ - lua_rawcall(L, 1, 0); - } - return 0; -} - - - -static const struct luaL_reg iolib[] = { - {LUA_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}, -}; - - -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 openwithcontrol (lua_State *L) { - IOCtrl *ctrl = (IOCtrl *)lua_newuserdata(L, sizeof(IOCtrl)); - unsigned int i; - ctrl->iotag = lua_newtag(L); - ctrl->closedtag = lua_newtag(L); - for (i=0; i<sizeof(iolibtag)/sizeof(iolibtag[0]); i++) { - /* put `ctrl' as upvalue for these functions */ - lua_pushvalue(L, -1); - lua_pushcclosure(L, iolibtag[i].func, 1); - lua_setglobal(L, iolibtag[i].name); - } - /* create references to variable names */ - lua_pushstring(L, filenames[INFILE]); - ctrl->ref[INFILE] = lua_ref(L, 1); - lua_pushstring(L, filenames[OUTFILE]); - ctrl->ref[OUTFILE] = lua_ref(L, 1); - /* predefined file handles */ - setfile(L, ctrl, stdin, INFILE); - setfile(L, ctrl, stdout, OUTFILE); - setfilebyname(L, ctrl, stdin, "_STDIN"); - setfilebyname(L, ctrl, stdout, "_STDOUT"); - setfilebyname(L, ctrl, stderr, "_STDERR"); - /* close files when collected */ - lua_pushcclosure(L, file_collect, 1); /* pops `ctrl' from stack */ - lua_settagmethod(L, ctrl->iotag, "gc"); -} - - -LUALIB_API void lua_iolibopen (lua_State *L) { - luaL_openl(L, iolib); - openwithcontrol(L); -} - |