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`lua.c' also needs the default path, so auxlib should provide it

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Roberto Ierusalimschy
2004-07-01 11:26:28 -03:00
parent 96917ff42a
commit 80ec81926c
3 changed files with 23 additions and 29 deletions
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22
lauxlib.c
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@@ -1,5 +1,5 @@
/*
** $Id: lauxlib.c,v 1.117 2004/06/21 20:05:29 roberto Exp roberto $
** $Id: lauxlib.c,v 1.118 2004/06/29 16:57:56 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@@ -341,6 +341,15 @@ LUALIB_API int luaL_getn (lua_State *L, int t) {
/* }====================================================== */
static const char *getpath (lua_State *L) {
const char *path;
lua_getglobal(L, LUA_PATH); /* try global variable */
path = lua_tostring(L, -1);
if (path) return path;
path = getenv(LUA_PATH); /* else try environment variable */
if (path) return path;
return LUA_PATH_DEFAULT; /* else use default */
}
static const char *pushnexttemplate (lua_State *L, const char *path) {
@@ -354,8 +363,8 @@ static const char *pushnexttemplate (lua_State *L, const char *path) {
}
static const char *gsub (lua_State *L, const char *s, const char *p,
const char *r) {
static const char *luaL_gsub (lua_State *L, const char *s,
const char *p, const char *r) {
const char *wild;
int l = strlen(p);
luaL_Buffer b;
@@ -363,7 +372,7 @@ static const char *gsub (lua_State *L, const char *s, const char *p,
while ((wild = strstr(s, p)) != NULL) {
luaL_addlstring(&b, s, wild - s); /* push prefix */
luaL_addstring(&b, r); /* push replacement in place of pattern */
s = wild + l; /* continue after p */
s = wild + l; /* continue after `p' */
}
luaL_addstring(&b, s); /* push last suffix (`n' already includes this) */
luaL_pushresult(&b);
@@ -375,17 +384,20 @@ LUALIB_API const char *luaL_searchpath (lua_State *L, const char *name,
const char *path) {
FILE *f;
const char *p = path;
if (p == NULL) p = getpath(L);
else lua_pushnil(L); /* to balance item pushed by `getpath' */
for (;;) {
const char *fname;
if ((p = pushnexttemplate(L, p)) == NULL) {
lua_pushfstring(L, "no readable `%s' in path `%s'", name, path);
return NULL;
}
fname = gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
fname = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
lua_remove(L, -2); /* remove path template */
f = fopen(fname, "r"); /* try to read it */
if (f) {
fclose(f);
lua_remove(L, -2); /* remove path */
return fname;
}
lua_pop(L, 1); /* remove file name */