sync code with last improvements from OpenBSD

xserver/hw/xwin/winclipboard/textconv.c

@@ -0,0 +1,142 @@
+/*
+ *Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
+ *
+ *Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ *"Software"), to deal in the Software without restriction, including
+ *without limitation the rights to use, copy, modify, merge, publish,
+ *distribute, sublicense, and/or sell copies of the Software, and to
+ *permit persons to whom the Software is furnished to do so, subject to
+ *the following conditions:
+ *
+ *The above copyright notice and this permission notice shall be
+ *included in all copies or substantial portions of the Software.
+ *
+ *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
+ *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ *Except as contained in this notice, the name of Harold L Hunt II
+ *shall not be used in advertising or otherwise to promote the sale, use
+ *or other dealings in this Software without prior written authorization
+ *from Harold L Hunt II.
+ *
+ * Authors:	Harold L Hunt II
+ */
+
+#ifdef HAVE_XWIN_CONFIG_H
+#include <xwin-config.h>
+#endif
+
+#include <stdlib.h>
+#include "internal.h"
+
+/*
+ * Convert \r\n to \n
+ *
+ * NOTE: This was heavily inspired by, Cygwin's
+ * winsup/cygwin/fhandler.cc/fhandler_base::read ()
+ */
+
+void
+winClipboardDOStoUNIX(char *pszSrc, int iLength)
+{
+    char *pszDest = pszSrc;
+    char *pszEnd = pszSrc + iLength;
+
+    /* Loop until the last character */
+    while (pszSrc < pszEnd) {
+        /* Copy the current source character to current destination character */
+        *pszDest = *pszSrc;
+
+        /* Advance to the next source character */
+        pszSrc++;
+
+        /* Don't advance the destination character if we need to drop an \r */
+        if (*pszDest != '\r' || *pszSrc != '\n')
+            pszDest++;
+    }
+
+    /* Move the terminating null */
+    *pszDest = '\0';
+}
+
+/*
+ * Convert \n to \r\n
+ */
+
+void
+winClipboardUNIXtoDOS(char **ppszData, int iLength)
+{
+    int iNewlineCount = 0;
+    char *pszSrc = *ppszData;
+    char *pszEnd = pszSrc + iLength;
+    char *pszDest = NULL, *pszDestBegin = NULL;
+
+    winDebug("UNIXtoDOS () - Original data:'%s'\n", *ppszData);
+
+    /* Count \n characters without leading \r */
+    while (pszSrc < pszEnd) {
+        /* Skip ahead two character if found set of \r\n */
+        if (*pszSrc == '\r' && pszSrc + 1 < pszEnd && *(pszSrc + 1) == '\n') {
+            pszSrc += 2;
+            continue;
+        }
+
+        /* Increment the count if found naked \n */
+        if (*pszSrc == '\n') {
+            iNewlineCount++;
+        }
+
+        pszSrc++;
+    }
+
+    /* Return if no naked \n's */
+    if (iNewlineCount == 0)
+        return;
+
+    /* Allocate a new string */
+    pszDestBegin = pszDest = malloc(iLength + iNewlineCount + 1);
+
+    /* Set source pointer to beginning of data string */
+    pszSrc = *ppszData;
+
+    /* Loop through all characters in source string */
+    while (pszSrc < pszEnd) {
+        /* Copy line endings that are already valid */
+        if (*pszSrc == '\r' && pszSrc + 1 < pszEnd && *(pszSrc + 1) == '\n') {
+            *pszDest = *pszSrc;
+            *(pszDest + 1) = *(pszSrc + 1);
+            pszDest += 2;
+            pszSrc += 2;
+            continue;
+        }
+
+        /* Add \r to naked \n's */
+        if (*pszSrc == '\n') {
+            *pszDest = '\r';
+            *(pszDest + 1) = *pszSrc;
+            pszDest += 2;
+            pszSrc += 1;
+            continue;
+        }
+
+        /* Copy normal characters */
+        *pszDest = *pszSrc;
+        pszSrc++;
+        pszDest++;
+    }
+
+    /* Put terminating null at end of new string */
+    *pszDest = '\0';
+
+    /* Swap string pointers */
+    free(*ppszData);
+    *ppszData = pszDestBegin;
+
+    winDebug("UNIXtoDOS () - Final string:'%s'\n", pszDestBegin);
+}