strtouq.c

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    1 /*-
    2  * Copyright (c) 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Chris Torek.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/ctype.h>
   39 #include <sys/limits.h>
   40 
   41 /*
   42  * Convert a string to an unsigned quad integer.
   43  *
   44  * Ignores `locale' stuff.  Assumes that the upper and lower case
   45  * alphabets and digits are each contiguous.
   46  */
   47 u_quad_t
   48 strtouq(const char *nptr, char **endptr, int base)
   49 {
   50         const char *s = nptr;
   51         u_quad_t acc;
   52         unsigned char c;
   53         u_quad_t qbase, cutoff;
   54         int neg, any, cutlim;
   55 
   56         /*
   57          * See strtoq for comments as to the logic used.
   58          */
   59         s = nptr;
   60         do {
   61                 c = *s++;
   62         } while (isspace(c));
   63         if (c == '-') {
   64                 neg = 1;
   65                 c = *s++;
   66         } else {
   67                 neg = 0;
   68                 if (c == '+')
   69                         c = *s++;
   70         }
   71         if ((base == 0 || base == 16) &&
   72             c == '' && (*s == 'x' || *s == 'X')) {
   73                 c = s[1];
   74                 s += 2;
   75                 base = 16;
   76         }
   77         if (base == 0)
   78                 base = c == '' ? 8 : 10;
   79         qbase = (unsigned)base;
   80         cutoff = (u_quad_t)UQUAD_MAX / qbase;
   81         cutlim = (u_quad_t)UQUAD_MAX % qbase;
   82         for (acc = 0, any = 0;; c = *s++) {
   83                 if (!isascii(c))
   84                         break;
   85                 if (isdigit(c))
   86                         c -= '';
   87                 else if (isalpha(c))
   88                         c -= isupper(c) ? 'A' - 10 : 'a' - 10;
   89                 else
   90                         break;
   91                 if (c >= base)
   92                         break;
   93                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
   94                         any = -1;
   95                 else {
   96                         any = 1;
   97                         acc *= qbase;
   98                         acc += c;
   99                 }
  100         }
  101         if (any < 0) {
  102                 acc = UQUAD_MAX;
  103         } else if (neg)
  104                 acc = -acc;
  105         if (endptr != 0)
  106                 *((const char **)endptr) = any ? s - 1 : nptr;
  107         return (acc);
  108 }

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FreeBSD/Linux Kernel Cross Reference sys/libkern/strtouq.c

FreeBSD/Linux Kernel Cross Reference
sys/libkern/strtouq.c