strtouq.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Chris Torek.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/ctype.h>
   41 #include <sys/limits.h>
   42 
   43 /*
   44  * Convert a string to an unsigned quad integer.
   45  *
   46  * Ignores `locale' stuff.  Assumes that the upper and lower case
   47  * alphabets and digits are each contiguous.
   48  */
   49 u_quad_t
   50 strtouq(const char *nptr, char **endptr, int base)
   51 {
   52         const char *s = nptr;
   53         u_quad_t acc;
   54         unsigned char c;
   55         u_quad_t qbase, cutoff;
   56         int neg, any, cutlim;
   57 
   58         /*
   59          * See strtoq for comments as to the logic used.
   60          */
   61         do {
   62                 c = *s++;
   63         } while (isspace(c));
   64         if (c == '-') {
   65                 neg = 1;
   66                 c = *s++;
   67         } else {
   68                 neg = 0;
   69                 if (c == '+')
   70                         c = *s++;
   71         }
   72         if ((base == 0 || base == 16) &&
   73             c == '' && (*s == 'x' || *s == 'X')) {
   74                 c = s[1];
   75                 s += 2;
   76                 base = 16;
   77         }
   78         if (base == 0)
   79                 base = c == '' ? 8 : 10;
   80         qbase = (unsigned)base;
   81         cutoff = (u_quad_t)UQUAD_MAX / qbase;
   82         cutlim = (u_quad_t)UQUAD_MAX % qbase;
   83         for (acc = 0, any = 0;; c = *s++) {
   84                 if (!isascii(c))
   85                         break;
   86                 if (isdigit(c))
   87                         c -= '';
   88                 else if (isalpha(c))
   89                         c -= isupper(c) ? 'A' - 10 : 'a' - 10;
   90                 else
   91                         break;
   92                 if (c >= base)
   93                         break;
   94                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
   95                         any = -1;
   96                 else {
   97                         any = 1;
   98                         acc *= qbase;
   99                         acc += c;
  100                 }
  101         }
  102         if (any < 0) {
  103                 acc = UQUAD_MAX;
  104         } else if (neg)
  105                 acc = -acc;
  106         if (endptr != NULL)
  107                 *endptr = __DECONST(char *, any ? s - 1 : nptr);
  108         return (acc);
  109 }

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

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sys/libkern/strtouq.c