newlib/libc/stdlib/strtoumax.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Copyright (c) 2011 The FreeBSD Foundation
   6  * All rights reserved.
   7  * Portions of this software were developed by David Chisnall
   8  * under sponsorship from the FreeBSD Foundation.
   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 #if defined(LIBC_SCCS) && !defined(lint)
  36 static char sccsid[] = "from @(#)strtoul.c      8.1 (Berkeley) 6/4/93";
  37 #endif /* LIBC_SCCS and not lint */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD: head/lib/libc/stdlib/strtoumax.c 251672 2013-06-13 00:19:30Z emaste $");
  40
  41 #include <ctype.h>
  42 #include <errno.h>
  43 #include <stdlib.h>
  44 #include <inttypes.h>
  45 #include <stdint.h>
  46 #include <reent.h>
  47 #include "../locale/setlocale.h"
  48
  49 /*
  50  * Convert a string to a uintmax_t integer.
  51  *
  52  * Assumes that the upper and lower case
  53  * alphabets and digits are each contiguous.
  54  */
  55
  56 /*
  57  *Reentrant version of strtoumax.
  58  */
  59 static uintmax_t
  60 _strtoumax_l(struct _reent *rptr, const char * __restrict nptr,
  61              char ** __restrict endptr, int base, locale_t loc)
  62 {
  63         const char *s = nptr;
  64         uintmax_t acc;
  65         char c;
  66         uintmax_t cutoff;
  67         int neg = 0, any, cutlim;
  68
  69         /*
  70          * See strtoimax for comments as to the logic used.
  71          */
  72         do {
  73                 c = *s++;
  74         } while (isspace_l(c, loc));
  75         if (c == '-') {
  76                 neg = 1;
  77                 c = *s++;
  78         } else {
  79                 neg = 0;
  80                 if (c == '+')
  81                         c = *s++;
  82         }
  83         if ((base == 0 || base == 16) &&
  84             c == '0' && (*s == 'x' || *s == 'X')) {
  85                 c = s[1];
  86                 s += 2;
  87                 base = 16;
  88         }
  89         if (base == 0)
  90                 base = c == '0' ? 8 : 10;
  91         acc = any = 0;
  92         if (base < 2 || base > 36)
  93                 goto noconv;
  94
  95         cutoff = UINTMAX_MAX / base;
  96         cutlim = UINTMAX_MAX % base;
  97         for ( ; ; c = *s++) {
  98                 if (c >= '0' && c <= '9')
  99                         c -= '0';
 100                 else if (c >= 'A' && c <= 'Z')
 101                         c -= 'A' - 10;
 102                 else if (c >= 'a' && c <= 'z')
 103                         c -= 'a' - 10;
 104                 else
 105                         break;
 106                 if (c >= base)
 107                         break;
 108                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 109                         any = -1;
 110                 else {
 111                         any = 1;
 112                         acc *= base;
 113                         acc += c;
 114                 }
 115         }
 116         if (any < 0) {
 117                 acc = UINTMAX_MAX;
 118                 _REENT_ERRNO(rptr) = ERANGE;
 119         } else if (!any) {
 120 noconv:
 121                 _REENT_ERRNO(rptr) = EINVAL;
 122         } else if (neg)
 123                 acc = -acc;
 124         if (endptr != NULL)
 125                 *endptr = (char *)(any ? s - 1 : nptr);
 126         return (acc);
 127 }
 128
 129 uintmax_t
 130 _strtoumax_r(struct _reent *rptr, const char *__restrict nptr,
 131              char **__restrict endptr, int base)
 132 {
 133         return _strtoumax_l(rptr, nptr, endptr, base, __get_current_locale());
 134 }
 135
 136 #ifndef _REENT_ONLY
 137
 138 uintmax_t
 139 strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base,
 140             locale_t loc)
 141 {
 142         return _strtoumax_l(_REENT, nptr, endptr, base, loc);
 143 }
 144
 145 uintmax_t
 146 strtoumax(const char* __restrict nptr, char** __restrict endptr, int base)
 147 {
 148         return _strtoumax_l(_REENT, nptr, endptr, base, __get_current_locale());
 149 }
 150
 151 #endif