1 /**
2 * \file os_pathsearch.c
3 * \brief Locates a file, given a set of search paths.
4 * \author Copyright (c) 2002-2008 Jason Perkins and the Premake project
5 *
6 * \note This function is required by the bootstrapping code; it must be
7 * implemented here in the host and not scripted.
8 */
9
10 #include <string.h>
11 #include "premake.h"
12
13
os_pathsearch(lua_State * L)14 int os_pathsearch(lua_State* L)
15 {
16 int i;
17 for (i = 2; i <= lua_gettop(L); ++i)
18 {
19 const char* path;
20
21 if (lua_isnil(L, i))
22 continue;
23
24 path = luaL_checkstring(L, i);
25 do
26 {
27 const char* split;
28
29 /* look for the closest path separator ; or : */
30 /* can't use : on windows because it breaks on C:\path */
31 const char* semi = strchr(path, ';');
32 #if !defined(PLATFORM_WINDOWS)
33 const char* full = strchr(path, ':');
34 #else
35 const char* full = NULL;
36 #endif
37
38 if (!semi)
39 {
40 split = full;
41 }
42 else if (!full)
43 {
44 split = semi;
45 }
46 else
47 {
48 split = (semi < full) ? semi : full;
49 }
50
51 /* push this piece of the full search string onto the stack */
52 if (split)
53 {
54 lua_pushlstring(L, path, split - path);
55 }
56 else
57 {
58 lua_pushstring(L, path);
59 }
60
61 /* keep an extra copy around, so I can return it if I have a match */
62 lua_pushvalue(L, -1);
63
64 /* append the filename to make the full test path */
65 lua_pushstring(L, "/");
66 lua_pushvalue(L, 1);
67 lua_concat(L, 3);
68
69 /* test it - if it exists return the path */
70 if (do_isfile(lua_tostring(L, -1)))
71 {
72 lua_pop(L, 1);
73 return 1;
74 }
75
76 /* no match, set up the next try */
77 lua_pop(L, 2);
78 path = (split) ? split + 1 : NULL;
79 }
80 while (path);
81 }
82
83 return 0;
84 }
85