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prstdio.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "primpl.h"
00039 
00040 #include <string.h>
00041 
00042 /*
00043 ** fprintf to a PRFileDesc
00044 */
00045 PR_IMPLEMENT(PRUint32) PR_fprintf(PRFileDesc* fd, const char *fmt, ...)
00046 {
00047     va_list ap;
00048     PRUint32 rv;
00049 
00050     va_start(ap, fmt);
00051     rv = PR_vfprintf(fd, fmt, ap);
00052     va_end(ap);
00053     return rv;
00054 }
00055 
00056 PR_IMPLEMENT(PRUint32) PR_vfprintf(PRFileDesc* fd, const char *fmt, va_list ap)
00057 {
00058     /* XXX this could be better */
00059     PRUint32 rv, len;
00060     char* msg = PR_vsmprintf(fmt, ap);
00061     len = strlen(msg);
00062 #ifdef XP_OS2
00063     /*
00064      * OS/2 really needs a \r for every \n.
00065      * In the future we should try to use scatter-gather instead of a
00066      * succession of PR_Write.
00067      */
00068     if (isatty(PR_FileDesc2NativeHandle(fd))) {
00069         PRUint32 last = 0, idx;
00070         PRInt32 tmp;
00071         rv = 0;
00072         for (idx = 0; idx < len+1; idx++) {
00073             if ((idx - last > 0) && (('\n' == msg[idx]) || (idx == len))) {
00074                 tmp = PR_Write(fd, msg + last, idx - last);
00075                 if (tmp >= 0) {
00076                     rv += tmp;
00077                 }
00078                 last = idx;
00079             }
00080             /*
00081              * if current character is \n, and
00082              * previous character isn't \r, and
00083              * next character isn't \r
00084              */
00085             if (('\n' == msg[idx]) &&
00086                 ((0 == idx) || ('\r' != msg[idx-1])) &&
00087                 ('\r' != msg[idx+1])) {
00088                 /* add extra \r */
00089                 tmp = PR_Write(fd, "\r", 1);
00090                 if (tmp >= 0) {
00091                     rv += tmp;
00092                 }
00093             }
00094         }
00095     } else {
00096         rv = PR_Write(fd, msg, len);
00097     }
00098 #else
00099     rv = PR_Write(fd, msg, len);
00100 #endif
00101     PR_DELETE(msg);
00102     return rv;
00103 }