gen/libsa/sprintf.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright 1993 NeXT, Inc.
  26  * All rights reserved.
  27  */
  28
  29 #import "libsa.h"
  30
  31 struct putc_info {
  32     char *str;
  33     char *last_str;
  34 };
  35
  36 static void
  37 sputc(
  38     int c,
  39     struct putc_info *pi
  40 )
  41 {
  42     if (pi->last_str)
  43         if (pi->str == pi->last_str) {
  44             *(pi->str) = '\0';
  45             return;
  46         }
  47     *(pi->str)++ = c;
  48 }
  49
  50 /*VARARGS1*/
  51 int sprintf(char *str, const char *fmt, ...)
  52 {
  53     va_list ap;
  54     struct putc_info pi;
  55
  56     va_start(ap, fmt);
  57     pi.str = str;
  58     pi.last_str = 0;
  59     prf(fmt, ap, sputc, &pi);
  60     *pi.str = '\0';
  61     va_end(ap);
  62     return 0;
  63 }
  64
  65 /*VARARGS1*/
  66 int slvprintf(char *str, int len, const char *fmt, va_list ap )
  67 {
  68     struct putc_info pi;
  69     pi.str = str;
  70     pi.last_str = str + len - 1;
  71     prf(fmt, ap, sputc, &pi);
  72     *pi.str = '\0';
  73     return (pi.str - str);
  74 }