The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/sscanf.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        sscanf.c,v $
   29  * Revision 2.3  93/03/26  17:54:53  mrt
   30  *      Lint.
   31  *      [93/03/23            af]
   32  * 
   33  * Revision 2.2  93/03/09  10:55:32  danner
   34  *      Created.
   35  *      [93/03/06  14:35:41  af]
   36  * 
   37  */
   38 /*
   39  *      File: sscanf.c
   40  *      Author: Alessandro Forin, Carnegie Mellon University
   41  *      Date:   3/93
   42  *
   43  *      Parse trivially simple strings
   44  */
   45 
   46 #include <mach/std_types.h>
   47 #if later
   48 #include <sys/stdargs.h>
   49 #else
   50 #include <sys/varargs.h>
   51 #endif
   52 
   53 /*
   54  * All I need is a miracle ...
   55  * to keep this from growing like all the other sscanf!
   56  */
   57 #if later
   58 int
   59 sscanf(
   60         register const unsigned char    *input,
   61         register const unsigned char    *fmt,
   62         ...)
   63 #else
   64 int
   65 sscanf( input, fmt, va_alist )
   66         unsigned char   *input;
   67         unsigned char   *fmt;
   68         va_dcl
   69 #endif
   70 {
   71         va_list         vp;
   72         register        int c;
   73         long            n;
   74         boolean_t       neg;
   75         const unsigned  char    *start = input;
   76 
   77 #if later
   78         va_start(vp, fmt);
   79 #else
   80         va_start(vp);
   81 #endif
   82 
   83         while (c = *fmt++) {
   84 
   85             if (c != '%' && c == *input) {
   86                 input++;
   87                 continue;
   88             }
   89 
   90             if (c != '%')
   91                 break;  /* mismatch */
   92 
   93             c = *fmt++;
   94 
   95             switch (c) {
   96 
   97             case 'd':
   98                 n = 0;
   99                 c = *input++;
  100 
  101                 neg =  c == '-';
  102                 if (neg) c = *input++;
  103 
  104                 while (c >= '' && c <= '9') {
  105                     n = n * 10 + (c - '');
  106                     c = *input++;
  107                 }
  108                 input--;        /* retract lookahead */
  109 
  110                 if (neg) n = -n;
  111 
  112                 /* done, store it away */
  113                 {
  114                         int     *p = va_arg(vp, int *);
  115                         *p = n;
  116                 }
  117 
  118                 break;
  119 
  120             default:
  121                 break;
  122             }
  123         }
  124 
  125         va_end(vp);     
  126 
  127         return (vm_offset_t)input - (vm_offset_t)start;
  128 }

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