769 lines
20 KiB
C
769 lines
20 KiB
C
/*
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** $Id: liolib.c,v 2.149 2016/05/02 14:03:19 roberto Exp $
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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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#define liolib_c
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#define LUA_LIB
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#include "lprefix.h"
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#include <ctype.h>
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#include <errno.h>
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#include <locale.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 "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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/*
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** Change this macro to accept other modes for 'fopen' besides
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** the standard ones.
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*/
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#if !defined(l_checkmode)
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/* accepted extensions to 'mode' in 'fopen' */
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#if !defined(L_MODEEXT)
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#define L_MODEEXT "b"
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#endif
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/* Check whether 'mode' matches '[rwa]%+?[L_MODEEXT]*' */
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#define l_checkmode(mode) \
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(*mode != '\0' && strchr("rwa", *(mode++)) != NULL && \
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(*mode != '+' || (++mode, 1)) && /* skip if char is '+' */ \
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(strspn(mode, L_MODEEXT) == strlen(mode)))
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#endif
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/*
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** {======================================================
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** l_popen spawns a new process connected to the current
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** one through the file streams.
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** =======================================================
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*/
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#if !defined(l_popen) /* { */
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#if defined(LUA_USE_POSIX) /* { */
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#define l_popen(L,c,m) (fflush(NULL), popen(c,m))
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#define l_pclose(L,file) (pclose(file))
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#elif defined(LUA_USE_WINDOWS) /* }{ */
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#define l_popen(L,c,m) (_popen(c,m))
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#define l_pclose(L,file) (_pclose(file))
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#else /* }{ */
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/* ISO C definitions */
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#define l_popen(L,c,m) \
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((void)((void)c, m), \
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luaL_error(L, "'popen' not supported"), \
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(FILE*)0)
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#define l_pclose(L,file) ((void)L, (void)file, -1)
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#endif /* } */
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#endif /* } */
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/* }====================================================== */
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#if !defined(l_getc) /* { */
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#if defined(LUA_USE_POSIX)
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#define l_getc(f) getc_unlocked(f)
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#define l_lockfile(f) flockfile(f)
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#define l_unlockfile(f) funlockfile(f)
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#else
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#define l_getc(f) getc(f)
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#define l_lockfile(f) ((void)0)
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#define l_unlockfile(f) ((void)0)
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#endif
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#endif /* } */
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/*
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** {======================================================
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** l_fseek: configuration for longer offsets
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** =======================================================
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*/
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#if !defined(l_fseek) /* { */
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#if defined(LUA_USE_POSIX) /* { */
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#include <sys/types.h>
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#define l_fseek(f,o,w) fseeko(f,o,w)
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#define l_ftell(f) ftello(f)
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#define l_seeknum off_t
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#elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \
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&& defined(_MSC_VER) && (_MSC_VER >= 1400) /* }{ */
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/* Windows (but not DDK) and Visual C++ 2005 or higher */
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#define l_fseek(f,o,w) _fseeki64(f,o,w)
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#define l_ftell(f) _ftelli64(f)
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#define l_seeknum __int64
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#else /* }{ */
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/* ISO C definitions */
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#define l_fseek(f,o,w) fseek(f,o,w)
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#define l_ftell(f) ftell(f)
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#define l_seeknum long
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#endif /* } */
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#endif /* } */
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/* }====================================================== */
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#define IO_PREFIX "_IO_"
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#define IOPREF_LEN (sizeof(IO_PREFIX)/sizeof(char) - 1)
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#define IO_INPUT (IO_PREFIX "input")
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#define IO_OUTPUT (IO_PREFIX "output")
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typedef luaL_Stream LStream;
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#define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
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#define isclosed(p) ((p)->closef == NULL)
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static int io_type (lua_State *L) {
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LStream *p;
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luaL_checkany(L, 1);
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p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
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if (p == NULL)
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lua_pushnil(L); /* not a file */
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else if (isclosed(p))
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lua_pushliteral(L, "closed file");
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else
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lua_pushliteral(L, "file");
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return 1;
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}
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static int f_tostring (lua_State *L) {
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LStream *p = tolstream(L);
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if (isclosed(p))
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lua_pushliteral(L, "file (closed)");
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else
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lua_pushfstring(L, "file (%p)", p->f);
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return 1;
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}
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static FILE *tofile (lua_State *L) {
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LStream *p = tolstream(L);
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if (isclosed(p))
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luaL_error(L, "attempt to use a closed file");
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lua_assert(p->f);
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return p->f;
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}
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/*
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** When creating file handles, always creates a 'closed' file handle
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** before opening the actual file; so, if there is a memory error, the
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** handle is in a consistent state.
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*/
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static LStream *newprefile (lua_State *L) {
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LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
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p->closef = NULL; /* mark file handle as 'closed' */
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luaL_setmetatable(L, LUA_FILEHANDLE);
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return p;
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}
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/*
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** Calls the 'close' function from a file handle. The 'volatile' avoids
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** a bug in some versions of the Clang compiler (e.g., clang 3.0 for
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** 32 bits).
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*/
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static int aux_close (lua_State *L) {
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LStream *p = tolstream(L);
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volatile lua_CFunction cf = p->closef;
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p->closef = NULL; /* mark stream as closed */
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return (*cf)(L); /* close it */
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}
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static int io_close (lua_State *L) {
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if (lua_isnone(L, 1)) /* no argument? */
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lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use standard output */
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tofile(L); /* make sure argument is an open stream */
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return aux_close(L);
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}
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static int f_gc (lua_State *L) {
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LStream *p = tolstream(L);
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if (!isclosed(p) && p->f != NULL)
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aux_close(L); /* ignore closed and incompletely open files */
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return 0;
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}
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/*
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** function to close regular files
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*/
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static int io_fclose (lua_State *L) {
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LStream *p = tolstream(L);
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int res = fclose(p->f);
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return luaL_fileresult(L, (res == 0), NULL);
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}
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static LStream *newfile (lua_State *L) {
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LStream *p = newprefile(L);
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p->f = NULL;
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p->closef = &io_fclose;
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return p;
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}
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static void opencheck (lua_State *L, const char *fname, const char *mode) {
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LStream *p = newfile(L);
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p->f = fopen(fname, mode);
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if (p->f == NULL)
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luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));
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}
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static int io_open (lua_State *L) {
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const char *filename = luaL_checkstring(L, 1);
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const char *mode = luaL_optstring(L, 2, "r");
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LStream *p = newfile(L);
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const char *md = mode; /* to traverse/check mode */
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luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
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p->f = fopen(filename, mode);
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return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
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}
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/*
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** function to close 'popen' files
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*/
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static int io_pclose (lua_State *L) {
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LStream *p = tolstream(L);
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return luaL_execresult(L, l_pclose(L, p->f));
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}
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static int io_popen (lua_State *L) {
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const char *filename = luaL_checkstring(L, 1);
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const char *mode = luaL_optstring(L, 2, "r");
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LStream *p = newprefile(L);
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p->f = l_popen(L, filename, mode);
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p->closef = &io_pclose;
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return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
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}
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static int io_tmpfile (lua_State *L) {
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LStream *p = newfile(L);
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p->f = tmpfile();
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return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
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}
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static FILE *getiofile (lua_State *L, const char *findex) {
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LStream *p;
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lua_getfield(L, LUA_REGISTRYINDEX, findex);
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p = (LStream *)lua_touserdata(L, -1);
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if (isclosed(p))
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luaL_error(L, "standard %s file is closed", findex + IOPREF_LEN);
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return p->f;
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}
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static int g_iofile (lua_State *L, const char *f, const char *mode) {
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if (!lua_isnoneornil(L, 1)) {
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const char *filename = lua_tostring(L, 1);
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if (filename)
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opencheck(L, filename, mode);
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else {
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tofile(L); /* check that it's a valid file handle */
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lua_pushvalue(L, 1);
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}
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lua_setfield(L, LUA_REGISTRYINDEX, f);
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}
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/* return current value */
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lua_getfield(L, LUA_REGISTRYINDEX, f);
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return 1;
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}
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static int io_input (lua_State *L) {
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return g_iofile(L, IO_INPUT, "r");
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}
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static int io_output (lua_State *L) {
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return g_iofile(L, IO_OUTPUT, "w");
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}
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static int io_readline (lua_State *L);
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/*
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** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit
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** in the limit for upvalues of a closure)
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*/
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#define MAXARGLINE 250
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static void aux_lines (lua_State *L, int toclose) {
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int n = lua_gettop(L) - 1; /* number of arguments to read */
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luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
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lua_pushinteger(L, n); /* number of arguments to read */
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lua_pushboolean(L, toclose); /* close/not close file when finished */
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lua_rotate(L, 2, 2); /* move 'n' and 'toclose' to their positions */
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lua_pushcclosure(L, io_readline, 3 + n);
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}
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static int f_lines (lua_State *L) {
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tofile(L); /* check that it's a valid file handle */
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aux_lines(L, 0);
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return 1;
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}
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static int io_lines (lua_State *L) {
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int toclose;
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if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */
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if (lua_isnil(L, 1)) { /* no file name? */
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lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */
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lua_replace(L, 1); /* put it at index 1 */
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tofile(L); /* check that it's a valid file handle */
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toclose = 0; /* do not close it after iteration */
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}
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else { /* open a new file */
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const char *filename = luaL_checkstring(L, 1);
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opencheck(L, filename, "r");
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lua_replace(L, 1); /* put file at index 1 */
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toclose = 1; /* close it after iteration */
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}
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aux_lines(L, toclose);
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return 1;
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}
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/*
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** {======================================================
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** READ
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** =======================================================
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*/
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/* maximum length of a numeral */
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#if !defined (L_MAXLENNUM)
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#define L_MAXLENNUM 200
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#endif
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/* auxiliary structure used by 'read_number' */
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typedef struct {
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FILE *f; /* file being read */
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int c; /* current character (look ahead) */
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int n; /* number of elements in buffer 'buff' */
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char buff[L_MAXLENNUM + 1]; /* +1 for ending '\0' */
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} RN;
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/*
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** Add current char to buffer (if not out of space) and read next one
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*/
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static int nextc (RN *rn) {
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if (rn->n >= L_MAXLENNUM) { /* buffer overflow? */
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rn->buff[0] = '\0'; /* invalidate result */
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return 0; /* fail */
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}
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else {
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rn->buff[rn->n++] = rn->c; /* save current char */
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rn->c = l_getc(rn->f); /* read next one */
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return 1;
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}
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}
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/*
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** Accept current char if it is in 'set' (of size 2)
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*/
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static int test2 (RN *rn, const char *set) {
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if (rn->c == set[0] || rn->c == set[1])
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return nextc(rn);
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else return 0;
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}
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/*
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** Read a sequence of (hex)digits
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*/
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static int readdigits (RN *rn, int hex) {
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int count = 0;
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while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))
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count++;
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return count;
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}
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/*
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** Read a number: first reads a valid prefix of a numeral into a buffer.
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** Then it calls 'lua_stringtonumber' to check whether the format is
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** correct and to convert it to a Lua number
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*/
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static int read_number (lua_State *L, FILE *f) {
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RN rn;
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int count = 0;
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int hex = 0;
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char decp[2];
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rn.f = f; rn.n = 0;
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decp[0] = lua_getlocaledecpoint(); /* get decimal point from locale */
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decp[1] = '.'; /* always accept a dot */
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l_lockfile(rn.f);
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do { rn.c = l_getc(rn.f); } while (isspace(rn.c)); /* skip spaces */
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test2(&rn, "-+"); /* optional signal */
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if (test2(&rn, "00")) {
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if (test2(&rn, "xX")) hex = 1; /* numeral is hexadecimal */
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else count = 1; /* count initial '0' as a valid digit */
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}
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count += readdigits(&rn, hex); /* integral part */
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if (test2(&rn, decp)) /* decimal point? */
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count += readdigits(&rn, hex); /* fractional part */
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if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) { /* exponent mark? */
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test2(&rn, "-+"); /* exponent signal */
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readdigits(&rn, 0); /* exponent digits */
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}
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ungetc(rn.c, rn.f); /* unread look-ahead char */
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l_unlockfile(rn.f);
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rn.buff[rn.n] = '\0'; /* finish string */
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if (lua_stringtonumber(L, rn.buff)) /* is this a valid number? */
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return 1; /* ok */
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else { /* invalid format */
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lua_pushnil(L); /* "result" to be removed */
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return 0; /* read fails */
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}
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}
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static int test_eof (lua_State *L, FILE *f) {
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int c = getc(f);
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ungetc(c, f); /* no-op when c == EOF */
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lua_pushliteral(L, "");
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return (c != EOF);
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}
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static int read_line (lua_State *L, FILE *f, int chop) {
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luaL_Buffer b;
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int c = '\0';
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luaL_buffinit(L, &b);
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while (c != EOF && c != '\n') { /* repeat until end of line */
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char *buff = luaL_prepbuffer(&b); /* preallocate buffer */
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int i = 0;
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l_lockfile(f); /* no memory errors can happen inside the lock */
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while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')
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buff[i++] = c;
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l_unlockfile(f);
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luaL_addsize(&b, i);
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}
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if (!chop && c == '\n') /* want a newline and have one? */
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luaL_addchar(&b, c); /* add ending newline to result */
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luaL_pushresult(&b); /* close buffer */
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/* return ok if read something (either a newline or something else) */
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return (c == '\n' || lua_rawlen(L, -1) > 0);
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}
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static void read_all (lua_State *L, FILE *f) {
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size_t nr;
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luaL_Buffer b;
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luaL_buffinit(L, &b);
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do { /* read file in chunks of LUAL_BUFFERSIZE bytes */
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char *p = luaL_prepbuffer(&b);
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nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);
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luaL_addsize(&b, nr);
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} while (nr == LUAL_BUFFERSIZE);
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luaL_pushresult(&b); /* close buffer */
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}
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static int read_chars (lua_State *L, FILE *f, size_t n) {
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size_t nr; /* number of chars actually read */
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char *p;
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luaL_Buffer b;
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luaL_buffinit(L, &b);
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p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */
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nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */
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luaL_addsize(&b, nr);
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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)luaL_checkinteger(L, n);
|
|
success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
|
|
}
|
|
else {
|
|
const char *p = luaL_checkstring(L, n);
|
|
if (*p == '*') p++; /* skip optional '*' (for compatibility) */
|
|
switch (*p) {
|
|
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);
|
|
luaL_checkstack(L, n, "too many arguments");
|
|
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_toboolean(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 */
|
|
int len = lua_isinteger(L, arg)
|
|
? fprintf(f, LUA_INTEGER_FMT, lua_tointeger(L, arg))
|
|
: fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg));
|
|
status = status && (len > 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_Integer p3 = luaL_optinteger(L, 3, 0);
|
|
l_seeknum offset = (l_seeknum)p3;
|
|
luaL_argcheck(L, (lua_Integer)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_pushinteger(L, (lua_Integer)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], (size_t)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;
|
|
}
|
|
|