--- /dev/null
+/*
+** $Id: liolib.c,v 2.111 2013/03/21 13:57:27 roberto Exp $
+** Standard I/O (and system) library
+** See Copyright Notice in lua.h
+*/
+
+
+/*
+** POSIX idiosyncrasy!
+** This definition must come before the inclusion of 'stdio.h'; it
+** should not affect non-POSIX systems
+*/
+#if !defined(_FILE_OFFSET_BITS)
+#define _FILE_OFFSET_BITS 64
+#endif
+
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define liolib_c
+#define LUA_LIB
+
+#include "lua.h"
+
+#include "lauxlib.h"
+#include "lualib.h"
+
+
+#if !defined(lua_checkmode)
+
+/*
+** Check whether 'mode' matches '[rwa]%+?b?'.
+** Change this macro to accept other modes for 'fopen' besides
+** the standard ones.
+*/
+#define lua_checkmode(mode) \
+ (*mode != '\0' && strchr("rwa", *(mode++)) != NULL && \
+ (*mode != '+' || ++mode) && /* skip if char is '+' */ \
+ (*mode != 'b' || ++mode) && /* skip if char is 'b' */ \
+ (*mode == '\0'))
+
+#endif
+
+/*
+** {======================================================
+** lua_popen spawns a new process connected to the current
+** one through the file streams.
+** =======================================================
+*/
+
+#if !defined(lua_popen) /* { */
+
+#if defined(LUA_USE_POPEN) /* { */
+
+#define lua_popen(L,c,m) ((void)L, fflush(NULL), popen(c,m))
+#define lua_pclose(L,file) ((void)L, pclose(file))
+
+#elif defined(LUA_WIN) /* }{ */
+
+#define lua_popen(L,c,m) ((void)L, _popen(c,m))
+#define lua_pclose(L,file) ((void)L, _pclose(file))
+
+
+#else /* }{ */
+
+#define lua_popen(L,c,m) ((void)((void)c, m), \
+ luaL_error(L, LUA_QL("popen") " not supported"), (FILE*)0)
+#define lua_pclose(L,file) ((void)((void)L, file), -1)
+
+
+#endif /* } */
+
+#endif /* } */
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** lua_fseek/lua_ftell: configuration for longer offsets
+** =======================================================
+*/
+
+#if !defined(lua_fseek) /* { */
+
+#if defined(LUA_USE_POSIX)
+
+#define l_fseek(f,o,w) fseeko(f,o,w)
+#define l_ftell(f) ftello(f)
+#define l_seeknum off_t
+
+#elif defined(LUA_WIN) && !defined(_CRTIMP_TYPEINFO) \
+ && defined(_MSC_VER) && (_MSC_VER >= 1400)
+/* Windows (but not DDK) and Visual C++ 2005 or higher */
+
+#define l_fseek(f,o,w) _fseeki64(f,o,w)
+#define l_ftell(f) _ftelli64(f)
+#define l_seeknum __int64
+
+#else
+
+#define l_fseek(f,o,w) fseek(f,o,w)
+#define l_ftell(f) ftell(f)
+#define l_seeknum long
+
+#endif
+
+#endif /* } */
+
+/* }====================================================== */
+
+
+#define IO_PREFIX "_IO_"
+#define IO_INPUT (IO_PREFIX "input")
+#define IO_OUTPUT (IO_PREFIX "output")
+
+
+typedef luaL_Stream LStream;
+
+
+#define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
+
+#define isclosed(p) ((p)->closef == NULL)
+
+
+static int io_type (lua_State *L) {
+ LStream *p;
+ luaL_checkany(L, 1);
+ p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
+ if (p == NULL)
+ lua_pushnil(L); /* not a file */
+ else if (isclosed(p))
+ lua_pushliteral(L, "closed file");
+ else
+ lua_pushliteral(L, "file");
+ return 1;
+}
+
+
+static int f_tostring (lua_State *L) {
+ LStream *p = tolstream(L);
+ if (isclosed(p))
+ lua_pushliteral(L, "file (closed)");
+ else
+ lua_pushfstring(L, "file (%p)", p->f);
+ return 1;
+}
+
+
+static FILE *tofile (lua_State *L) {
+ LStream *p = tolstream(L);
+ if (isclosed(p))
+ luaL_error(L, "attempt to use a closed file");
+ lua_assert(p->f);
+ return p->f;
+}
+
+
+/*
+** When creating file handles, always creates a `closed' file handle
+** before opening the actual file; so, if there is a memory error, the
+** file is not left opened.
+*/
+static LStream *newprefile (lua_State *L) {
+ LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
+ p->closef = NULL; /* mark file handle as 'closed' */
+ luaL_setmetatable(L, LUA_FILEHANDLE);
+ return p;
+}
+
+
+static int aux_close (lua_State *L) {
+ LStream *p = tolstream(L);
+ lua_CFunction cf = p->closef;
+ p->closef = NULL; /* mark stream as closed */
+ return (*cf)(L); /* close it */
+}
+
+
+static int io_close (lua_State *L) {
+ if (lua_isnone(L, 1)) /* no argument? */
+ lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use standard output */
+ tofile(L); /* make sure argument is an open stream */
+ return aux_close(L);
+}
+
+
+static int f_gc (lua_State *L) {
+ LStream *p = tolstream(L);
+ if (!isclosed(p) && p->f != NULL)
+ aux_close(L); /* ignore closed and incompletely open files */
+ return 0;
+}
+
+
+/*
+** function to close regular files
+*/
+static int io_fclose (lua_State *L) {
+ LStream *p = tolstream(L);
+ int res = fclose(p->f);
+ return luaL_fileresult(L, (res == 0), NULL);
+}
+
+
+static LStream *newfile (lua_State *L) {
+ LStream *p = newprefile(L);
+ p->f = NULL;
+ p->closef = &io_fclose;
+ return p;
+}
+
+
+static void opencheck (lua_State *L, const char *fname, const char *mode) {
+ LStream *p = newfile(L);
+ p->f = fopen(fname, mode);
+ if (p->f == NULL)
+ luaL_error(L, "cannot open file " LUA_QS " (%s)", fname, strerror(errno));
+}
+
+
+static int io_open (lua_State *L) {
+ const char *filename = luaL_checkstring(L, 1);
+ const char *mode = luaL_optstring(L, 2, "r");
+ LStream *p = newfile(L);
+ const char *md = mode; /* to traverse/check mode */
+ luaL_argcheck(L, lua_checkmode(md), 2, "invalid mode");
+ p->f = fopen(filename, mode);
+ return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
+}
+
+
+/*
+** function to close 'popen' files
+*/
+static int io_pclose (lua_State *L) {
+ LStream *p = tolstream(L);
+ return luaL_execresult(L, lua_pclose(L, p->f));
+}
+
+
+static int io_popen (lua_State *L) {
+ const char *filename = luaL_checkstring(L, 1);
+ const char *mode = luaL_optstring(L, 2, "r");
+ LStream *p = newprefile(L);
+ p->f = lua_popen(L, filename, mode);
+ p->closef = &io_pclose;
+ return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
+}
+
+
+static int io_tmpfile (lua_State *L) {
+ LStream *p = newfile(L);
+ p->f = tmpfile();
+ return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
+}
+
+
+static FILE *getiofile (lua_State *L, const char *findex) {
+ LStream *p;
+ lua_getfield(L, LUA_REGISTRYINDEX, findex);
+ p = (LStream *)lua_touserdata(L, -1);
+ if (isclosed(p))
+ luaL_error(L, "standard %s file is closed", findex + strlen(IO_PREFIX));
+ return p->f;
+}
+
+
+static int g_iofile (lua_State *L, const char *f, const char *mode) {
+ if (!lua_isnoneornil(L, 1)) {
+ const char *filename = lua_tostring(L, 1);
+ if (filename)
+ opencheck(L, filename, mode);
+ else {
+ tofile(L); /* check that it's a valid file handle */
+ lua_pushvalue(L, 1);
+ }
+ lua_setfield(L, LUA_REGISTRYINDEX, f);
+ }
+ /* return current value */
+ lua_getfield(L, LUA_REGISTRYINDEX, f);
+ return 1;
+}
+
+
+static int io_input (lua_State *L) {
+ return g_iofile(L, IO_INPUT, "r");
+}
+
+
+static int io_output (lua_State *L) {
+ return g_iofile(L, IO_OUTPUT, "w");
+}
+
+
+static int io_readline (lua_State *L);
+
+
+static void aux_lines (lua_State *L, int toclose) {
+ int i;
+ int n = lua_gettop(L) - 1; /* number of arguments to read */
+ /* ensure that arguments will fit here and into 'io_readline' stack */
+ luaL_argcheck(L, n <= LUA_MINSTACK - 3, LUA_MINSTACK - 3, "too many options");
+ lua_pushvalue(L, 1); /* file handle */
+ lua_pushinteger(L, n); /* number of arguments to read */
+ lua_pushboolean(L, toclose); /* close/not close file when finished */
+ for (i = 1; i <= n; i++) lua_pushvalue(L, i + 1); /* copy arguments */
+ lua_pushcclosure(L, io_readline, 3 + n);
+}
+
+
+static int f_lines (lua_State *L) {
+ tofile(L); /* check that it's a valid file handle */
+ aux_lines(L, 0);
+ return 1;
+}
+
+
+static int io_lines (lua_State *L) {
+ int toclose;
+ if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */
+ if (lua_isnil(L, 1)) { /* no file name? */
+ lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */
+ lua_replace(L, 1); /* put it at index 1 */
+ tofile(L); /* check that it's a valid file handle */
+ toclose = 0; /* do not close it after iteration */
+ }
+ else { /* open a new file */
+ const char *filename = luaL_checkstring(L, 1);
+ opencheck(L, filename, "r");
+ lua_replace(L, 1); /* put file at index 1 */
+ toclose = 1; /* close it after iteration */
+ }
+ aux_lines(L, toclose);
+ return 1;
+}
+
+
+/*
+** {======================================================
+** READ
+** =======================================================
+*/
+
+
+static int read_number (lua_State *L, FILE *f) {
+ lua_Number d;
+ if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
+ lua_pushnumber(L, d);
+ return 1;
+ }
+ else {
+ lua_pushnil(L); /* "result" to be removed */
+ return 0; /* read fails */
+ }
+}
+
+
+static int test_eof (lua_State *L, FILE *f) {
+ int c = getc(f);
+ ungetc(c, f);
+ lua_pushlstring(L, NULL, 0);
+ return (c != EOF);
+}
+
+
+static int read_line (lua_State *L, FILE *f, int chop) {
+ luaL_Buffer b;
+ luaL_buffinit(L, &b);
+ for (;;) {
+ size_t l;
+ char *p = luaL_prepbuffer(&b);
+ if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
+ luaL_pushresult(&b); /* close buffer */
+ return (lua_rawlen(L, -1) > 0); /* check whether read something */
+ }
+ l = strlen(p);
+ if (l == 0 || p[l-1] != '\n')
+ luaL_addsize(&b, l);
+ else {
+ luaL_addsize(&b, l - chop); /* chop 'eol' if needed */
+ luaL_pushresult(&b); /* close buffer */
+ return 1; /* read at least an `eol' */
+ }
+ }
+}
+
+
+#define MAX_SIZE_T (~(size_t)0)
+
+static void read_all (lua_State *L, FILE *f) {
+ size_t rlen = LUAL_BUFFERSIZE; /* how much to read in each cycle */
+ luaL_Buffer b;
+ luaL_buffinit(L, &b);
+ for (;;) {
+ char *p = luaL_prepbuffsize(&b, rlen);
+ size_t nr = fread(p, sizeof(char), rlen, f);
+ luaL_addsize(&b, nr);
+ if (nr < rlen) break; /* eof? */
+ else if (rlen <= (MAX_SIZE_T / 4)) /* avoid buffers too large */
+ rlen *= 2; /* double buffer size at each iteration */
+ }
+ luaL_pushresult(&b); /* close buffer */
+}
+
+
+static int read_chars (lua_State *L, FILE *f, size_t n) {
+ size_t nr; /* number of chars actually read */
+ char *p;
+ luaL_Buffer b;
+ luaL_buffinit(L, &b);
+ p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */
+ nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */
+ luaL_addsize(&b, nr);
+ luaL_pushresult(&b); /* close buffer */
+ return (nr > 0); /* true iff read something */
+}
+
+
+static int g_read (lua_State *L, FILE *f, int first) {
+ int nargs = lua_gettop(L) - 1;
+ int success;
+ int n;
+ clearerr(f);
+ if (nargs == 0) { /* no arguments? */
+ success = read_line(L, f, 1);
+ n = first+1; /* to return 1 result */
+ }
+ else { /* ensure stack space for all results and for auxlib's buffer */
+ luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
+ success = 1;
+ for (n = first; nargs-- && success; n++) {
+ if (lua_type(L, n) == LUA_TNUMBER) {
+ size_t l = (size_t)lua_tointeger(L, n);
+ success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
+ }
+ else {
+ const char *p = lua_tostring(L, n);
+ luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
+ switch (p[1]) {
+ case 'n': /* number */
+ success = read_number(L, f);
+ break;
+ case 'l': /* line */
+ success = read_line(L, f, 1);
+ break;
+ case 'L': /* line with end-of-line */
+ success = read_line(L, f, 0);
+ break;
+ case 'a': /* file */
+ read_all(L, f); /* read entire file */
+ success = 1; /* always success */
+ break;
+ default:
+ return luaL_argerror(L, n, "invalid format");
+ }
+ }
+ }
+ }
+ if (ferror(f))
+ return luaL_fileresult(L, 0, NULL);
+ if (!success) {
+ lua_pop(L, 1); /* remove last result */
+ lua_pushnil(L); /* push nil instead */
+ }
+ return n - first;
+}
+
+
+static int io_read (lua_State *L) {
+ return g_read(L, getiofile(L, IO_INPUT), 1);
+}
+
+
+static int f_read (lua_State *L) {
+ return g_read(L, tofile(L), 2);
+}
+
+
+static int io_readline (lua_State *L) {
+ LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1));
+ int i;
+ int n = (int)lua_tointeger(L, lua_upvalueindex(2));
+ if (isclosed(p)) /* file is already closed? */
+ return luaL_error(L, "file is already closed");
+ lua_settop(L , 1);
+ for (i = 1; i <= n; i++) /* push arguments to 'g_read' */
+ lua_pushvalue(L, lua_upvalueindex(3 + i));
+ n = g_read(L, p->f, 2); /* 'n' is number of results */
+ lua_assert(n > 0); /* should return at least a nil */
+ if (!lua_isnil(L, -n)) /* read at least one value? */
+ return n; /* return them */
+ else { /* first result is nil: EOF or error */
+ if (n > 1) { /* is there error information? */
+ /* 2nd result is error message */
+ return luaL_error(L, "%s", lua_tostring(L, -n + 1));
+ }
+ if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */
+ lua_settop(L, 0);
+ lua_pushvalue(L, lua_upvalueindex(1));
+ aux_close(L); /* close it */
+ }
+ return 0;
+ }
+}
+
+/* }====================================================== */
+
+
+static int g_write (lua_State *L, FILE *f, int arg) {
+ int nargs = lua_gettop(L) - arg;
+ int status = 1;
+ for (; nargs--; arg++) {
+ if (lua_type(L, arg) == LUA_TNUMBER) {
+ /* optimization: could be done exactly as for strings */
+ status = status &&
+ fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
+ }
+ else {
+ size_t l;
+ const char *s = luaL_checklstring(L, arg, &l);
+ status = status && (fwrite(s, sizeof(char), l, f) == l);
+ }
+ }
+ if (status) return 1; /* file handle already on stack top */
+ else return luaL_fileresult(L, status, NULL);
+}
+
+
+static int io_write (lua_State *L) {
+ return g_write(L, getiofile(L, IO_OUTPUT), 1);
+}
+
+
+static int f_write (lua_State *L) {
+ FILE *f = tofile(L);
+ lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
+ return g_write(L, f, 2);
+}
+
+
+static int f_seek (lua_State *L) {
+ static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
+ static const char *const modenames[] = {"set", "cur", "end", NULL};
+ FILE *f = tofile(L);
+ int op = luaL_checkoption(L, 2, "cur", modenames);
+ lua_Number p3 = luaL_optnumber(L, 3, 0);
+ l_seeknum offset = (l_seeknum)p3;
+ luaL_argcheck(L, (lua_Number)offset == p3, 3,
+ "not an integer in proper range");
+ op = l_fseek(f, offset, mode[op]);
+ if (op)
+ return luaL_fileresult(L, 0, NULL); /* error */
+ else {
+ lua_pushnumber(L, (lua_Number)l_ftell(f));
+ return 1;
+ }
+}
+
+
+static int f_setvbuf (lua_State *L) {
+ static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
+ static const char *const modenames[] = {"no", "full", "line", NULL};
+ FILE *f = tofile(L);
+ int op = luaL_checkoption(L, 2, NULL, modenames);
+ lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
+ int res = setvbuf(f, NULL, mode[op], sz);
+ return luaL_fileresult(L, res == 0, NULL);
+}
+
+
+
+static int io_flush (lua_State *L) {
+ return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
+}
+
+
+static int f_flush (lua_State *L) {
+ return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
+}
+
+
+/*
+** functions for 'io' library
+*/
+static const luaL_Reg iolib[] = {
+ {"close", io_close},
+ {"flush", io_flush},
+ {"input", io_input},
+ {"lines", io_lines},
+ {"open", io_open},
+ {"output", io_output},
+ {"popen", io_popen},
+ {"read", io_read},
+ {"tmpfile", io_tmpfile},
+ {"type", io_type},
+ {"write", io_write},
+ {NULL, NULL}
+};
+
+
+/*
+** methods for file handles
+*/
+static const luaL_Reg flib[] = {
+ {"close", io_close},
+ {"flush", f_flush},
+ {"lines", f_lines},
+ {"read", f_read},
+ {"seek", f_seek},
+ {"setvbuf", f_setvbuf},
+ {"write", f_write},
+ {"__gc", f_gc},
+ {"__tostring", f_tostring},
+ {NULL, NULL}
+};
+
+
+static void createmeta (lua_State *L) {
+ luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
+ lua_pushvalue(L, -1); /* push metatable */
+ lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
+ luaL_setfuncs(L, flib, 0); /* add file methods to new metatable */
+ lua_pop(L, 1); /* pop new metatable */
+}
+
+
+/*
+** function to (not) close the standard files stdin, stdout, and stderr
+*/
+static int io_noclose (lua_State *L) {
+ LStream *p = tolstream(L);
+ p->closef = &io_noclose; /* keep file opened */
+ lua_pushnil(L);
+ lua_pushliteral(L, "cannot close standard file");
+ return 2;
+}
+
+
+static void createstdfile (lua_State *L, FILE *f, const char *k,
+ const char *fname) {
+ LStream *p = newprefile(L);
+ p->f = f;
+ p->closef = &io_noclose;
+ if (k != NULL) {
+ lua_pushvalue(L, -1);
+ lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */
+ }
+ lua_setfield(L, -2, fname); /* add file to module */
+}
+
+
+LUAMOD_API int luaopen_io (lua_State *L) {
+ luaL_newlib(L, iolib); /* new module */
+ createmeta(L);
+ /* create (and set) default files */
+ createstdfile(L, stdin, IO_INPUT, "stdin");
+ createstdfile(L, stdout, IO_OUTPUT, "stdout");
+ createstdfile(L, stderr, NULL, "stderr");
+ return 1;
+}
+
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