From fc4154b166a9c2c41c18a1007c39ebeff265d465 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Mon, 31 Jan 2022 10:12:42 -0500
Subject: [PATCH] doscalls: fixes to DosQueryPathInfo(x, FIL_QUERYFULLNAME,
 ...).

This gets unzip.exe (and self-extracting zip files) to mostly work.
---
 native/doscalls.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/native/doscalls.c b/native/doscalls.c
index f46aa9e..c601870 100644
--- a/native/doscalls.c
+++ b/native/doscalls.c
@@ -1149,14 +1149,21 @@ static APIRET queryPathInfoEaSize(PSZ unixPath, PVOID pInfoBuf, ULONG cbInfoBuf)
 static APIRET queryPathInfoFullName(PSZ unixPath, PVOID pInfoBuf, ULONG cbInfoBuf)
 {
     char *real = realpath(unixPath, NULL);
-    if (real == NULL)
-        return ERROR_NOT_ENOUGH_MEMORY;  // !!! FIXME: no
+    if (real == NULL) {
+        // !!! FIXME: what _should_ this do if file doesn't exist? If parent directory doesn't?
+        real = strdup(unixPath);  // could be file doesn't exist, but this still needs to return something...
+        if (real == NULL) {
+            return ERROR_NOT_ENOUGH_MEMORY;  // !!! FIXME: no
+        }
+    }
 
-    if ((strlen(real) + 3) < cbInfoBuf) {
+    if ((strlen(real) + 3) >= cbInfoBuf) {
         free(real);
         return ERROR_BUFFER_OVERFLOW;
-    } // if
+    }
 
+    // !!! FIXME: this needs to map to drive letters defined in a config
+    // !!! FIXME:  eventually.
     char *dst = (char *) pInfoBuf;
     *(dst++) = 'C';
     *(dst++) = ':';
@@ -1167,7 +1174,7 @@ static APIRET queryPathInfoFullName(PSZ unixPath, PVOID pInfoBuf, ULONG cbInfoBu
         if (*dst == '/')
             *dst = '\\';
         dst++;
-    } // while
+    }
 
     return NO_ERROR;
 } // queryPathInfoFullName