/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "primpl.h"

#include <string.h>

/*

** fprintf to a PRFileDesc

*/

PR_IMPLEMENT(PRUint32) PR_fprintf(PRFileDesc* fd, const char *fmt, ...)

{

    va_list ap;

    PRUint32 rv;

    va_start(ap, fmt);

    rv = PR_vfprintf(fd, fmt, ap);

    va_end(ap);

    return rv;

}

PR_IMPLEMENT(PRUint32) PR_vfprintf(PRFileDesc* fd, const char *fmt, va_list ap)

{

    /* XXX this could be better */

    PRUint32 rv, len;

    char* msg = PR_vsmprintf(fmt, ap);

    if (NULL == msg) {

        return -1;

    }

    len = strlen(msg);

#ifdef XP_OS2

    /*

     * OS/2 really needs a \r for every \n.

     * In the future we should try to use scatter-gather instead of a

     * succession of PR_Write.

     */

    if (isatty(PR_FileDesc2NativeHandle(fd))) {

        PRUint32 last = 0, idx;

        PRInt32 tmp;

        rv = 0;

        for (idx = 0; idx < len+1; idx++) {

            if ((idx - last > 0) && (('\n' == msg[idx]) || (idx == len))) {

                tmp = PR_Write(fd, msg + last, idx - last);

                if (tmp >= 0) {

                    rv += tmp;

                }

                last = idx;

            }

            /*

             * if current character is \n, and

             * previous character isn't \r, and

             * next character isn't \r

             */

            if (('\n' == msg[idx]) &&

                ((0 == idx) || ('\r' != msg[idx-1])) &&

                ('\r' != msg[idx+1])) {

                /* add extra \r */

                tmp = PR_Write(fd, "\r", 1);

                if (tmp >= 0) {

                    rv += tmp;

                }

            }

        }

    } else {

        rv = PR_Write(fd, msg, len);

    }

#else

    rv = PR_Write(fd, msg, len);

#endif

    PR_DELETE(msg);

    return rv;

}