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/**
* \file os_pathsearch.c
* \brief Locates a file, given a set of search paths.
* \author Copyright (c) 2002-2008 Jason Perkins and the Premake project
*
* \note This function is required by the bootstrapping code; it must be
* implemented here in the host and not scripted.
*/
#include <string.h>
#include "premake.h"
int os_pathsearch(lua_State* L)
{
int i;
for (i = 2; i <= lua_gettop(L); ++i)
{
const char* path;
if (lua_isnil(L, i))
continue;
path = luaL_checkstring(L, i);
do
{
const char* split;
/* look for the closest path separator ; or : */
/* can't use : on windows because it breaks on C:\path */
const char* semi = strchr(path, ';');
#if !defined(PLATFORM_WINDOWS)
const char* full = strchr(path, ':');
#else
const char* full = NULL;
#endif
if (!semi)
{
split = full;
}
else if (!full)
{
split = semi;
}
else
{
split = (semi < full) ? semi : full;
}
/* push this piece of the full search string onto the stack */
if (split)
{
lua_pushlstring(L, path, split - path);
}
else
{
lua_pushstring(L, path);
}
/* keep an extra copy around, so I can return it if I have a match */
lua_pushvalue(L, -1);
/* append the filename to make the full test path */
lua_pushstring(L, "/");
lua_pushvalue(L, 1);
lua_concat(L, 3);
/* test it - if it exists return the path */
if (do_isfile(lua_tostring(L, -1)))
{
lua_pop(L, 1);
return 1;
}
/* no match, set up the next try */
lua_pop(L, 2);
path = (split) ? split + 1 : NULL;
}
while (path);
}
return 0;
}
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