bsp/drv/lib/strtoul.c

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This source file includes following definitions.
strtoul
   1 /*
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 
  30 #include <ddi.h>
  31 #include <machine/limits.h>
  32 
  33 /*
  34  * Convert a string to an unsigned long integer.
  35  *
  36  * Ignores `locale' stuff.  Assumes that the upper and lower case
  37  * alphabets and digits are each contiguous.
  38  *
  39  * return ULONG_MAX if error.
  40  */
  41 unsigned long
  42 strtoul(const char *nptr, char **endptr, int base)
  43 {
  44         const char *s;
  45         unsigned long acc, cutoff;
  46         int c;
  47         int neg, any, cutlim;
  48 
  49         /*
  50          * See strtol for comments as to the logic used.
  51          */
  52         s = nptr;
  53         do {
  54                 c = (unsigned char) *s++;
  55         } while (isspace(c));
  56         if (c == '-') {
  57                 neg = 1;
  58                 c = *s++;
  59         } else {
  60                 neg = 0;
  61                 if (c == '+')
  62                         c = *s++;
  63         }
  64         if ((base == 0 || base == 16) &&
  65             c == '0' && (*s == 'x' || *s == 'X')) {
  66                 c = s[1];
  67                 s += 2;
  68                 base = 16;
  69         }
  70         if (base == 0)
  71                 base = c == '0' ? 8 : 10;
  72 
  73         cutoff = ULONG_MAX / base;
  74         cutlim = (int)(ULONG_MAX % (unsigned long)base);
  75         for (acc = 0, any = 0;; c = (unsigned char) *s++) {
  76                 if (isdigit(c))
  77                         c -= '0';
  78                 else if (isalpha(c))
  79                         c -= isupper(c) ? 'A' - 10 : 'a' - 10;
  80                 else
  81                         break;
  82                 if (c >= base)
  83                         break;
  84                 if (any < 0)
  85                         continue;
  86                 if (acc > cutoff || (acc == cutoff && c > cutlim)) {
  87                         any = -1;
  88                         acc = ULONG_MAX;
  89                 } else {
  90                         any = 1;
  91                         acc *= (unsigned long)base;
  92                         acc += c;
  93                 }
  94         }
  95         if (neg && any > 0)
  96                 acc = -acc;
  97         if (endptr != 0)
  98                 /* LINTED interface specification */
  99                 *endptr = (char *)(any ? s - 1 : nptr);
 100         return (acc);
 101 }
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root/bsp/drv/lib/strtoul.c

DEFINITIONS
