#define liolib_c
#define LUA_LIB
#include "lprefix.h"
#include <ctype.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#if !defined(l_checkmode)
#define l_checkmode(mode) \
(*mode != '\0' && strchr("rwa", *(mode++)) != NULL && \
(*mode != '+' || ++mode) && \
(*mode != 'b' || ++mode) && \
(*mode == '\0'))
#endif
#if !defined(l_popen)
#if defined(LUA_USE_POSIX)
#define l_popen(L,c,m) (fflush(NULL), popen(c,m))
#define l_pclose(L,file) (pclose(file))
#elif defined(LUA_USE_WINDOWS)
#define l_popen(L,c,m) (_popen(c,m))
#define l_pclose(L,file) (_pclose(file))
#else
#define l_popen(L,c,m) \
((void)((void)c, m), \
luaL_error(L, "'popen' not supported"), \
(FILE*)0)
#define l_pclose(L,file) ((void)L, (void)file, -1)
#endif
#endif
#if !defined(l_getc)
#if defined(LUA_USE_POSIX)
#define l_getc(f) getc_unlocked(f)
#define l_lockfile(f) flockfile(f)
#define l_unlockfile(f) funlockfile(f)
#else
#define l_getc(f) getc(f)
#define l_lockfile(f) ((void)0)
#define l_unlockfile(f) ((void)0)
#endif
#endif
#if !defined(l_fseek)
#if defined(LUA_USE_POSIX)
#include <sys/types.h>
#define l_fseek(f,o,w) fseeko(f,o,w)
#define l_ftell(f) ftello(f)
#define l_seeknum off_t
#elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \
&& defined(_MSC_VER) && (_MSC_VER >= 1400)
#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 IOPREF_LEN (sizeof(IO_PREFIX)/sizeof(char) - 1)
#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);
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;
}
static LStream *newprefile (lua_State *L) {
LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
p->closef = NULL;
luaL_setmetatable(L, LUA_FILEHANDLE);
return p;
}
static int aux_close (lua_State *L) {
LStream *p = tolstream(L);
volatile lua_CFunction cf = p->closef;
p->closef = NULL;
return (*cf)(L);
}
static int io_close (lua_State *L) {
if (lua_isnone(L, 1))
lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT);
tofile(L);
return aux_close(L);
}
static int f_gc (lua_State *L) {
LStream *p = tolstream(L);
if (!isclosed(p) && p->f != NULL)
aux_close(L);
return 0;
}
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 '%s' (%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;
luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
p->f = fopen(filename, mode);
return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
}
static int io_pclose (lua_State *L) {
LStream *p = tolstream(L);
return luaL_execresult(L, l_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 = l_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 + IOPREF_LEN);
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);
lua_pushvalue(L, 1);
}
lua_setfield(L, LUA_REGISTRYINDEX, f);
}
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 n = lua_gettop(L) - 1;
lua_pushinteger(L, n);
lua_pushboolean(L, toclose);
lua_rotate(L, 2, 2);
lua_pushcclosure(L, io_readline, 3 + n);
}
static int f_lines (lua_State *L) {
tofile(L);
aux_lines(L, 0);
return 1;
}
static int io_lines (lua_State *L) {
int toclose;
if (lua_isnone(L, 1)) lua_pushnil(L);
if (lua_isnil(L, 1)) {
lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT);
lua_replace(L, 1);
tofile(L);
toclose = 0;
}
else {
const char *filename = luaL_checkstring(L, 1);
opencheck(L, filename, "r");
lua_replace(L, 1);
toclose = 1;
}
aux_lines(L, toclose);
return 1;
}
#define MAXRN 200
typedef struct {
FILE *f;
int c;
int n;
char buff[MAXRN + 1];
} RN;
static int nextc (RN *rn) {
if (rn->n >= MAXRN) {
rn->buff[0] = '\0';
return 0;
}
else {
rn->buff[rn->n++] = rn->c;
rn->c = l_getc(rn->f);
return 1;
}
}
static int test2 (RN *rn, const char *set) {
if (rn->c == set[0] || (rn->c == set[1] && rn->c != '\0'))
return nextc(rn);
else return 0;
}
static int readdigits (RN *rn, int hex) {
int count = 0;
while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))
count++;
return count;
}
static int read_number (lua_State *L, FILE *f) {
RN rn;
int count = 0;
int hex = 0;
char decp[2];
rn.f = f; rn.n = 0;
decp[0] = lua_getlocaledecpoint();
decp[1] = '\0';
l_lockfile(rn.f);
do { rn.c = l_getc(rn.f); } while (isspace(rn.c));
test2(&rn, "-+");
if (test2(&rn, "0")) {
if (test2(&rn, "xX")) hex = 1;
else count = 1;
}
count += readdigits(&rn, hex);
if (test2(&rn, decp))
count += readdigits(&rn, hex);
if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) {
test2(&rn, "-+");
readdigits(&rn, 0);
}
ungetc(rn.c, rn.f);
l_unlockfile(rn.f);
rn.buff[rn.n] = '\0';
if (lua_stringtonumber(L, rn.buff))
return 1;
else {
lua_pushnil(L);
return 0;
}
}
static int test_eof (lua_State *L, FILE *f) {
int c = getc(f);
ungetc(c, f);
lua_pushliteral(L, "");
return (c != EOF);
}
static int read_line (lua_State *L, FILE *f, int chop) {
luaL_Buffer b;
int c = '\0';
luaL_buffinit(L, &b);
while (c != EOF && c != '\n') {
char *buff = luaL_prepbuffer(&b);
int i = 0;
l_lockfile(f);
while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')
buff[i++] = c;
l_unlockfile(f);
luaL_addsize(&b, i);
}
if (!chop && c == '\n')
luaL_addchar(&b, c);
luaL_pushresult(&b);
return (c == '\n' || lua_rawlen(L, -1) > 0);
}
static void read_all (lua_State *L, FILE *f) {
size_t nr;
luaL_Buffer b;
luaL_buffinit(L, &b);
do {
char *p = luaL_prepbuffsize(&b, LUAL_BUFFERSIZE);
nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);
luaL_addsize(&b, nr);
} while (nr == LUAL_BUFFERSIZE);
luaL_pushresult(&b);
}
static int read_chars (lua_State *L, FILE *f, size_t n) {
size_t nr;
char *p;
luaL_Buffer b;
luaL_buffinit(L, &b);
p = luaL_prepbuffsize(&b, n);
nr = fread(p, sizeof(char), n, f);
luaL_addsize(&b, nr);
luaL_pushresult(&b);
return (nr > 0);
}
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) {
success = read_line(L, f, 1);
n = first+1;
}
else {
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++;
switch (*p) {
case 'n':
success = read_number(L, f);
break;
case 'l':
success = read_line(L, f, 1);
break;
case 'L':
success = read_line(L, f, 0);
break;
case 'a':
read_all(L, f);
success = 1;
break;
default:
return luaL_argerror(L, n, "invalid format");
}
}
}
}
if (ferror(f))
return luaL_fileresult(L, 0, NULL);
if (!success) {
lua_pop(L, 1);
lua_pushnil(L);
}
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))
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++)
lua_pushvalue(L, lua_upvalueindex(3 + i));
n = g_read(L, p->f, 2);
lua_assert(n > 0);
if (lua_toboolean(L, -n))
return n;
else {
if (n > 1) {
return luaL_error(L, "%s", lua_tostring(L, -n + 1));
}
if (lua_toboolean(L, lua_upvalueindex(3))) {
lua_settop(L, 0);
lua_pushvalue(L, lua_upvalueindex(1));
aux_close(L);
}
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) {
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;
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);
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);
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);
}
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}
};
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);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
luaL_setfuncs(L, flib, 0);
lua_pop(L, 1);
}
static int io_noclose (lua_State *L) {
LStream *p = tolstream(L);
p->closef = &io_noclose;
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);
}
lua_setfield(L, -2, fname);
}
LUAMOD_API int luaopen_io (lua_State *L) {
luaL_newlib(L, iolib);
createmeta(L);
createstdfile(L, stdin, IO_INPUT, "stdin");
createstdfile(L, stdout, IO_OUTPUT, "stdout");
createstdfile(L, stderr, NULL, "stderr");
return 1;
}