From cb893d618cd884b61e96e626c9406cbeac718683 Mon Sep 17 00:00:00 2001
From: Mario Fetka <mario.fetka@gmail.com>
Date: Sat, 23 May 2026 22:25:49 +0200
Subject: [PATCH] dostools flag

---
 c32ncp.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 64 insertions(+), 13 deletions(-)

diff --git a/c32ncp.c b/c32ncp.c
index a53e0c3..128e3ea 100644
--- a/c32ncp.c
+++ b/c32ncp.c
@@ -29,22 +29,72 @@ static uint32 c32_get_dword_lh(uint8 *p)
          ((uint32)p[3] << 24));
 }
 
-static int c32_build_handle_path(uint8 *p, uint8 dhandle, const char *name)
+static UI c32_build_handle_path(uint8 *buf, uint8 dhandle,
+                                uint16 dirbase, uint8 style,
+                                int count,
+                                const char *c1, const char *c2, const char *c3)
 {
-  int nlen;
+  uint8 *p;
+  int l;
+  UI used;
 
-  nlen = strlen(name);
-  if (nlen > 255)
-    nlen = 255;
+  /*
+   * DeveloperNet/ncpdos16 path structure used by NCP87/S6 through
+   * Client32 COMPATNcpRequestReply.
+   *
+   * This is the exact shape verified by TESTS NCP87C32AUTO:
+   *   00 02 00 00 00 00 01 09 4C 4F 47 49 4E 2E 45 58 45
+   *
+   * Meaning:
+   *   word[1] = short dir handle
+   *   word[3] = dir base
+   *   byte[5] = dirstyle
+   *   byte[6] = component count
+   *   then len/name components
+   *
+   * The old/simple struct used by the INT 21h F257 fallback is not accepted
+   * by this Client32 path.
+   */
+  memset(buf, 0, 0x140);
 
-  *p++ = dhandle;
-  c32_put_dword_lh(p, 0L); p += 4;
-  *p++ = 0;                 /* dirstyle = short dir handle */
-  *p++ = 1;                 /* one path component */
-  *p++ = (uint8)nlen;
-  memcpy(p, name, nlen);
+  if (dhandle) {
+    c32_put_word_lh(buf + 1, (uint16)dhandle);
+    c32_put_word_lh(buf + 3, dirbase);
+    buf[5] = style;
+  } else {
+    buf[5] = 0xff;
+  }
 
-  return(1 + 4 + 1 + 1 + 1 + nlen);
+  p = buf + 6;
+  *p++ = (uint8)count;
+
+  if (count > 0 && c1) {
+    l = strlen(c1);
+    if (l > 255) l = 255;
+    *p++ = (uint8)l;
+    memcpy(p, c1, l);
+    p += l;
+  }
+
+  if (count > 1 && c2) {
+    l = strlen(c2);
+    if (l > 255) l = 255;
+    *p++ = (uint8)l;
+    memcpy(p, c2, l);
+    p += l;
+  }
+
+  if (count > 2 && c3) {
+    l = strlen(c3);
+    if (l > 255) l = 255;
+    *p++ = (uint8)l;
+    memcpy(p, c3, l);
+    p += l;
+  }
+
+  used = (UI)(p - buf);
+  c32_put_word_lh(buf + 0x13c, used);
+  return(used);
 }
 
 /*
@@ -133,7 +183,8 @@ int c32_ncp87_obtain_rim_attributes(const char *name,
   c32_put_word_lh(hdr + 3, 0x0006);        /* SA_ALL */
   c32_put_dword_lh(hdr + 5, 0x00000004UL); /* RIM_ATTRIBUTES */
 
-  path_len = c32_build_handle_path(path, (uint8)dir_handle, name);
+  path_len = c32_build_handle_path(path, (uint8)dir_handle, 0, 0, 1,
+                                    name, NULL, NULL);
 
   memset(rep0, 0, sizeof(rep0));
   memset(rep1, 0, sizeof(rep1));