where: Implement search with default options.

programs/where/Makefile.in

 MODULE    = where.exe
+IMPORTS   = shlwapi
 
 EXTRADLLFLAGS = -mconsole -municode
 

programs/where/main.c

 /*
  * Copyright 2020 Louis Lenders
+ * Copyright 2024 Alex Henrie
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -16,18 +17,106 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#include <windows.h>
+#include <fileapi.h>
+#include <shlwapi.h>
+
 #include "wine/debug.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(where);
 
+static BOOL found;
+
+static void search(const WCHAR *search_path, const WCHAR *pattern)
+{
+    static const WCHAR *extensions[] = {L"", L".bat", L".cmd", L".com", L".exe"};
+    WCHAR glob[MAX_PATH];
+    WCHAR match_path[MAX_PATH];
+    WIN32_FIND_DATAW match;
+    HANDLE handle;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(extensions); i++)
+    {
+        if (wcslen(search_path) + 1 + wcslen(pattern) + wcslen(extensions[i]) + 1 > ARRAY_SIZE(glob))
+        {
+            ERR("Path too long\n");
+            return;
+        }
+        /* Treat the extension as part of the pattern */
+        wcscpy(glob, search_path);
+        wcscat(glob, L"\\");
+        wcscat(glob, pattern);
+        wcscat(glob, extensions[i]);
+
+        handle = FindFirstFileExW(glob, FindExInfoBasic, &match, 0, NULL, 0);
+        if (handle != INVALID_HANDLE_VALUE)
+        {
+            do
+            {
+                if (PathCombineW(match_path, search_path, match.cFileName))
+                {
+                    printf("%ls\n", match_path);
+                    found = TRUE;
+                }
+            }
+            while (FindNextFileW(handle, &match));
+            FindClose(handle);
+        }
+    }
+}
+
 int __cdecl wmain(int argc, WCHAR *argv[])
 {
+    WCHAR *pattern, *colon, *search_paths, *search_path, *next_search_path;
     int i;
 
-    WINE_FIXME("stub:");
     for (i = 0; i < argc; i++)
-        WINE_FIXME(" %s", wine_dbgstr_w(argv[i]));
-    WINE_FIXME("\n");
+    {
+        if (argv[i][0] == '/')
+        {
+            FIXME("Unsupported option %ls\n", argv[i]);
+            return 1;
+        }
+    }
+
+    for (i = 1; i < argc; i++)
+    {
+        pattern = argv[i];
+        colon = wcsrchr(pattern, ':');
+
+        /* Check for a set of search paths prepended to the pattern */
+        if (colon)
+        {
+            *colon = 0;
+            search_paths = pattern;
+            pattern = colon + 1;
+        }
+        else
+        {
+            search_paths = _wgetenv(L"PATH");
+        }
+
+        if (wcspbrk(pattern, L"\\/\r\n")) continue; /* Silently ignore invalid patterns */
+
+        if (!colon)
+        {
+            /* If the search paths were not explicitly specified, search the current directory first */
+            WCHAR current_dir[MAX_PATH];
+            if (GetCurrentDirectoryW(ARRAY_SIZE(current_dir), current_dir))
+                search(current_dir, pattern);
+        }
+
+        next_search_path = wcsdup(search_paths);
+        while ((search_path = wcstok(NULL, L";", &next_search_path)))
+            search(search_path, pattern);
+    }
+
+    if (!found)
+    {
+        fputs("File not found\n", stderr);
+        return 1;
+    }
 
     return 0;
 }