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/* llfslibext.c
Copyright 2010-2011 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
LuaTeX is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#include "ptexlib.h"
#include "lua/luatex-api.h"
#include <kpathsea/c-stat.h>
#include <kpathsea/c-dir.h>
#include <time.h>
#ifdef _WIN32
# include <windows.h>
#else
#endif
#ifdef _WIN32
static int get_short_name(lua_State * L)
{
long length = 0;
TCHAR *buffer = NULL;
const char *lpszPath = luaL_checkstring(L, 1);
length = GetShortPathName(lpszPath, NULL, 0);
if (length == 0) {
lua_pushnil(L);
lua_pushfstring(L, "operating system error: %d", (int) GetLastError());
return 2;
}
buffer = (TCHAR *) xmalloc(length * sizeof(TCHAR));
length = GetShortPathName(lpszPath, buffer, length);
if (length == 0) {
lua_pushnil(L);
lua_pushfstring(L, "operating system error: %d", (int) GetLastError());
return 2;
}
lua_pushlstring(L, (const char *) buffer, (size_t) length);
return 1;
}
static int read_link(lua_State * L)
{
lua_pushboolean(L, 0);
lua_pushliteral(L, "readlink not supported on this platform");
return 2;
}
#else
static int pusherror(lua_State * L, const char *info)
{
lua_pushnil(L);
if (info == NULL)
lua_pushstring(L, strerror(errno));
else
lua_pushfstring(L, "%s: %s", info, strerror(errno));
lua_pushinteger(L, errno);
return 3;
}
static int Preadlink(lua_State * L)
{
/** readlink(path) */
const char *path = luaL_checkstring(L, 1);
char *b = NULL;
int allocated = 128;
int n;
while (1) {
b = malloc(allocated);
if (!b)
return pusherror(L, path);
n = readlink(path, b, allocated);
if (n == -1) {
free(b);
return pusherror(L, path);
}
if (n < allocated)
break;
/* Not enough room, try bigger */
allocated *= 2;
free(b);
}
lua_pushlstring(L, b, n);
free(b);
return 1;
}
static int read_link(lua_State * L)
{
return Preadlink(L);
}
static int get_short_name(lua_State * L __attribute__ ((unused)))
{
/* simply do nothing */
return 1;
}
#endif
/*
** Get file information
*/
static int file_is_directory(lua_State * L)
{
struct stat info;
const char *file = luaL_checkstring(L, 1);
if (stat(file, &info)) {
lua_pushnil(L);
lua_pushfstring(L, "cannot obtain information from file `%s'", file);
return 2;
}
if (S_ISDIR(info.st_mode))
lua_pushboolean(L, 1);
else
lua_pushboolean(L, 0);
return 1;
}
static int file_is_file(lua_State * L)
{
struct stat info;
const char *file = luaL_checkstring(L, 1);
if (stat(file, &info)) {
lua_pushnil(L);
lua_pushfstring(L, "cannot obtain information from file `%s'", file);
return 2;
}
if (S_ISREG(info.st_mode))
lua_pushboolean(L, 1);
else
lua_pushboolean(L, 0);
return 1;
}
void open_lfslibext(lua_State * L)
{
lua_getglobal(L, "lfs");
lua_pushcfunction(L, file_is_directory);
lua_setfield(L, -2, "isdir");
lua_pushcfunction(L, file_is_file);
lua_setfield(L, -2, "isfile");
lua_pushcfunction(L, read_link);
lua_setfield(L, -2, "readlink");
lua_pushcfunction(L, get_short_name);
lua_setfield(L, -2, "shortname");
lua_pop(L, 1); /* pop the table */
}
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