stdlib/strtoll-fbsd.c

   1 /*-
   2  * Copyright (c) 1992, 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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)strtoq.c    8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/stdlib/strtoll.c,v 1.19 2002/09/06 11:23:59 tjr Exp $");
  39
  40 #include "xlocale_private.h"
  41
  42 #include <limits.h>
  43 #include <errno.h>
  44 #include <ctype.h>
  45 #include <stdlib.h>
  46
  47 /*
  48  * Convert a string to a long long integer.
  49  *
  50  * Assumes that the upper and lower case
  51  * alphabets and digits are each contiguous.
  52  */
  53 long long
  54 strtoll_l(const char * __restrict nptr, char ** __restrict endptr, int base,
  55     locale_t loc)
  56 {
  57         const char *s;
  58         unsigned long long acc;
  59         char c;
  60         unsigned long long cutoff;
  61         int neg, any, cutlim;
  62
  63         NORMALIZE_LOCALE(loc);
  64         /*
  65          * Skip white space and pick up leading +/- sign if any.
  66          * If base is 0, allow 0x for hex and 0 for octal, else
  67          * assume decimal; if base is already 16, allow 0x.
  68          */
  69         s = nptr;
  70         do {
  71                 c = *s++;
  72         } while (isspace_l((unsigned char)c, loc));
  73         if (c == '-') {
  74                 neg = 1;
  75                 c = *s++;
  76         } else {
  77                 neg = 0;
  78                 if (c == '+')
  79                         c = *s++;
  80         }
  81         if ((base == 0 || base == 16) &&
  82             c == '0' && (*s == 'x' || *s == 'X')) {
  83                 c = s[1];
  84                 s += 2;
  85                 base = 16;
  86         }
  87         if (base == 0)
  88                 base = c == '0' ? 8 : 10;
  89         acc = any = 0;
  90         if (base < 2 || base > 36)
  91                 goto noconv;
  92
  93         /*
  94          * Compute the cutoff value between legal numbers and illegal
  95          * numbers.  That is the largest legal value, divided by the
  96          * base.  An input number that is greater than this value, if
  97          * followed by a legal input character, is too big.  One that
  98          * is equal to this value may be valid or not; the limit
  99          * between valid and invalid numbers is then based on the last
 100          * digit.  For instance, if the range for quads is
 101          * [-9223372036854775808..9223372036854775807] and the input base
 102          * is 10, cutoff will be set to 922337203685477580 and cutlim to
 103          * either 7 (neg==0) or 8 (neg==1), meaning that if we have
 104          * accumulated a value > 922337203685477580, or equal but the
 105          * next digit is > 7 (or 8), the number is too big, and we will
 106          * return a range error.
 107          *
 108          * Set 'any' if any `digits' consumed; make it negative to indicate
 109          * overflow.
 110          */
 111         cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX
 112             : LLONG_MAX;
 113         cutlim = cutoff % base;
 114         cutoff /= base;
 115         for ( ; ; c = *s++) {
 116                 if (c >= '0' && c <= '9')
 117                         c -= '0';
 118                 else if (c >= 'A' && c <= 'Z')
 119                         c -= 'A' - 10;
 120                 else if (c >= 'a' && c <= 'z')
 121                         c -= 'a' - 10;
 122                 else
 123                         break;
 124                 if (c >= base)
 125                         break;
 126                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 127                         any = -1;
 128                 else {
 129                         any = 1;
 130                         acc *= base;
 131                         acc += c;
 132                 }
 133         }
 134         if (any < 0) {
 135                 acc = neg ? LLONG_MIN : LLONG_MAX;
 136                 errno = ERANGE;
 137         } else if (!any) {
 138 noconv:
 139                 errno = EINVAL;
 140         } else if (neg)
 141                 acc = -acc;
 142         if (endptr != NULL)
 143                 *endptr = (char *)(any ? s - 1 : nptr);
 144         return (acc);
 145 }
 146
 147 long long
 148 strtoll(const char * __restrict nptr, char ** __restrict endptr, int base)
 149 {
 150         return strtoll_l(nptr, endptr, base, __current_locale());
 151 }