0,0 → 1,657 |
/* |
** $Id: liolib.c,v 2.108 2011/11/25 12:50:03 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" |
|
|
|
/* |
** {====================================================== |
** 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); |
int i = 0; |
/* check whether 'mode' matches '[rwa]%+?b?' */ |
if (!(mode[i] != '\0' && strchr("rwa", mode[i++]) != NULL && |
(mode[i] != '+' || ++i) && /* skip if char is '+' */ |
(mode[i] != 'b' || ++i) && /* skip if char is 'b' */ |
(mode[i] == '\0'))) |
return luaL_error(L, "invalid mode " LUA_QS |
" (should match " LUA_QL("[rwa]%%+?b?") ")", 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; |
} |
|