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-rw-r--r--src/lua/liolib.c710
1 files changed, 710 insertions, 0 deletions
diff --git a/src/lua/liolib.c b/src/lua/liolib.c
new file mode 100644
index 00000000..4fb385f4
--- /dev/null
+++ b/src/lua/liolib.c
@@ -0,0 +1,710 @@
+/*
+** $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);
+}
+
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