Changeset 106917 in vbox for trunk/src/VBox/Runtime/common/string/strncpy.cpp

Timestamp:

Nov 10, 2024 2:26:41 AM (3 months ago)

Author:

vboxsync

Message:

IPRT: Added C++ versions of bzero, memmove, strcmp & strncpy for win.arm64 to use in RuntimeR0 and other nocrt situations. jiraref:VBP-1442

File:

• trunk/src/VBox/Runtime/common/string/strncpy.cpp (copied) (copied from trunk/src/VBox/Runtime/common/string/strcpy.cpp ) (2 diffs)

trunk/src/VBox/Runtime/common/string/strncpy.cpp

@@ -1 +1 @@
 /* $Id$ */
 /** @file
- * IPRT - CRT Strings, strcpy().
+ * IPRT - CRT Strings, strncpy().
  */
 
@@ -49 +49 @@
  * @param   pszDst      Will contain a copy of pszSrc.
  * @param   pszSrc      Zero terminated string.
+ * @param   cbDst       Size of the destination buffer.
  */
 #ifdef IPRT_NO_CRT
-# undef strcpy
-char *RT_NOCRT(strcpy)(char *pszDst, const char *pszSrc)
+# undef strncpy
+char *RT_NOCRT(strncpy)(char *pszDst, const char *pszSrc, size_t cbDst)
 #else
-char *strcpy(char *pszDst, const char *pszSrc)
+char *strncpy(char *pszDst, const char *pszSrc, size_t cbDst)
 #endif
 {
-    char * const pszRet = pszDst;
-    while ((*pszDst = *pszSrc++) != '\0')
-        pszDst++;
+    size_t off = 0;
+    while (off < cbDst)
+    {
+        char const ch = *pszSrc;
+        pszDst[off++] = ch;
+        if (ch)
+        { /* likely */ }
+        else
+        {
+            /* (this zeroing is not very efficient) */
+            while (off < cbDst)
+                pszDst[off++] = '\0';
+            break;
+        }
+    }
 
-    return pszRet;
+    return pszDst;
 }
-RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(strcpy);
+RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(strncpy);