gen/libsa/sprintf.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright 1993 NeXT, Inc.
  27  * All rights reserved.
  28  */
  29
  30 #import "libsa.h"
  31
  32 struct putc_info {
  33     char *str;
  34     char *last_str;
  35 };
  36
  37 static void
  38 sputc(
  39     int c,
  40     struct putc_info *pi
  41 )
  42 {
  43     if (pi->last_str)
  44         if (pi->str == pi->last_str) {
  45             *(pi->str) = '\0';
  46             return;
  47         }
  48     *(pi->str)++ = c;
  49 }
  50
  51 /*VARARGS1*/
  52 int sprintf(char *str, const char *fmt, ...)
  53 {
  54     va_list ap;
  55     struct putc_info pi;
  56
  57     va_start(ap, fmt);
  58     pi.str = str;
  59     pi.last_str = 0;
  60     prf(fmt, ap, sputc, &pi);
  61     *pi.str = '\0';
  62     va_end(ap);
  63     return 0;
  64 }
  65
  66 /*VARARGS1*/
  67 int slvprintf(char *str, int len, const char *fmt, va_list ap )
  68 {
  69     struct putc_info pi;
  70     pi.str = str;
  71     pi.last_str = str + len - 1;
  72     prf(fmt, ap, sputc, &pi);
  73     *pi.str = '\0';
  74     return (pi.str - str);
  75 }