xref: /xsrc/external/mit/xorg-server/dist/hw/xwin/winclipboard/textconv.c

/*
 *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);
}