liolib.c
上传用户:dzyhzl
上传日期:2019-04-29
资源大小:56270k
文件大小:19k
- /*
- ** $Id: liolib.c,v 1.91 2000/10/31 13:10:24 roberto 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"
- //#include "errno.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
- //这个define调试时加的,以后要去掉!!!
- //#define errno (-1)//Question
- #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 != ' ') {
- 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 == ' ');
- }
- #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) {
- double d;
- if (fscanf(f, "%lf", &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, "%.16g", 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_tmpname (lua_State *L) {
- lua_pushstring(L, tmpnam(NULL));
- return 1;
- }
- 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, ((double)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) {
- printf("LUASCRIPT_ERROR!!!!!FROM io_exit!!!!!!111n");
- printf("LUASCRIPT_ERROR!!!!!FROM io_exit!!!!!!111n");
- printf("LUASCRIPT_ERROR!!!!!FROM io_exit!!!!!!111n");
- // 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, "contn") == 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},
- {"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 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);
- }