Add the function chbufdup() to duplicate a chtype array

src/intf.c

@@ -1235,6 +1235,32 @@ int vprepstr (chtype *restrict chbuf, int chbufsize, chtype attr_norm,
 }
 
 
+/***********************************************************************/
+// chbufdup: Duplicate a chtype buffer
+
+chtype *chbufdup (const chtype *restrict chbuf, int chbufsize)
+{
+    const chtype *p;
+    int len;
+    chtype *ret;
+
+
+    // Determine chbuf length, including ending NUL
+    for (len = 1, p = chbuf; *p != '\0' && len <= chbufsize; p++, len++)
+	;
+
+    ret = malloc(len * sizeof(chtype));
+    if (ret == NULL) {
+	err_exit_nomem();
+    }
+
+    memcpy(ret, chbuf, len * sizeof(chtype));
+    ret[len - 1] = '\0';	// Terminating NUL, just in case not present
+
+    return ret;
+}
+
+
 /***********************************************************************/
 // pr_left: Print strings in chbuf left-aligned
 

src/intf.h

@@ -385,6 +385,20 @@ extern int vprepstr (chtype *restrict chbuf, int chbufsize, chtype attr_norm,
 		     const char *restrict format, va_list args);
 
 
+/*
+  Function:   chbufdup  - Duplicate a chtype buffer
+  Parameters: chbuf     - Buffer to duplicate
+              chbufsize - Number of chtype elements in chbuf
+  Returns:    chtype *  - Pointer to new duplicated buffer
+
+  This function returns a new buffer of type chtype * that contains a
+  copy of the string in chbuf.  No errors are returned: if sufficient
+  memory is not available, the program terminates with an "Out of memory"
+  message.
+*/
+extern chtype *chbufdup (const chtype *restrict chbuf, int chbufsize);
+
+
 /*
   Function:   pr_left  - Print strings in chbuf left-aligned
   Parameters: win      - Window to use (should be curwin)