The Design and Implementation of the FreeBSD Operating System, Second Edition
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD10  -  FREEBSD9  -  FREEBSD92  -  FREEBSD91  -  FREEBSD90  -  FREEBSD8  -  FREEBSD82  -  FREEBSD81  -  FREEBSD80  -  FREEBSD7  -  FREEBSD74  -  FREEBSD73  -  FREEBSD72  -  FREEBSD71  -  FREEBSD70  -  FREEBSD6  -  FREEBSD64  -  FREEBSD63  -  FREEBSD62  -  FREEBSD61  -  FREEBSD60  -  FREEBSD5  -  FREEBSD55  -  FREEBSD54  -  FREEBSD53  -  FREEBSD52  -  FREEBSD51  -  FREEBSD50  -  FREEBSD4  -  FREEBSD3  -  FREEBSD22  -  cheribsd  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1  -  FREEBSD-LIBC  -  FREEBSD8-LIBC  -  FREEBSD7-LIBC  -  FREEBSD6-LIBC  -  GLIBC27 
SearchContext: -  none  -  3  -  10 

    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  * 3. 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  * $FreeBSD: src/sys/libkern/strtouq.c,v 1.3 1999/12/01 22:56:51 archie Exp $
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/ctype.h>
   38 #include <machine/limits.h>
   39 
   40 /*
   41  * Convert a string to an unsigned quad integer.
   42  *
   43  * Ignores `locale' stuff.  Assumes that the upper and lower case
   44  * alphabets and digits are each contiguous.
   45  */
   46 u_quad_t
   47 strtouq(const char *nptr, char **endptr, int base)
   48 {
   49         const char *s;
   50         u_quad_t acc;
   51         unsigned char c;
   52         u_quad_t qbase, cutoff;
   53         int neg, any, cutlim;
   54 
   55         /*
   56          * See strtoq for comments as to the logic used.
   57          */
   58         s = nptr;
   59         do {
   60                 c = *s++;
   61         } while (isspace(c));
   62         if (c == '-') {
   63                 neg = 1;
   64                 c = *s++;
   65         } else {
   66                 neg = 0;
   67                 if (c == '+')
   68                         c = *s++;
   69         }
   70         if ((base == 0 || base == 16) &&
   71             c == '' && (*s == 'x' || *s == 'X')) {
   72                 c = s[1];
   73                 s += 2;
   74                 base = 16;
   75         }
   76         if (base == 0)
   77                 base = c == '' ? 8 : 10;
   78         qbase = (unsigned)base;
   79         cutoff = (u_quad_t)UQUAD_MAX / qbase;
   80         cutlim = (u_quad_t)UQUAD_MAX % qbase;
   81         for (acc = 0, any = 0;; c = *s++) {
   82                 if (!isascii(c))
   83                         break;
   84                 if (isdigit(c))
   85                         c -= '';
   86                 else if (isalpha(c))
   87                         c -= isupper(c) ? 'A' - 10 : 'a' - 10;
   88                 else
   89                         break;
   90                 if (c >= base)
   91                         break;
   92                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
   93                         any = -1;
   94                 else {
   95                         any = 1;
   96                         acc *= qbase;
   97                         acc += c;
   98                 }
   99         }
  100         if (any < 0) {
  101                 acc = UQUAD_MAX;
  102         } else if (neg)
  103                 acc = -acc;
  104         if (endptr != NULL)
  105                 *((const char **)(void *)endptr) = any ? s - 1 : nptr;
  106         return (acc);
  107 }

Cache object: 33fe4dfa0e484e8d33e18ac813bd1e1a


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.