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strtoull.c revision 1.1 
      1 /*	$NetBSD: strtoull.c,v 1.1 2017/01/28 20:46:53 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Copyright (c) 2011 The FreeBSD Foundation
      8  * All rights reserved.
      9  * Portions of this software were developed by David Chisnall
     10  * under sponsorship from the FreeBSD Foundation.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <config.h>
     38 
     39 #include <string.h>
     40 
     41 #include <krb5/roken.h>
     42 
     43 /* #include <sys/cdefs.h> */
     44 
     45 #include <limits.h>
     46 #include <errno.h>
     47 #include <ctype.h>
     48 #include <stdlib.h>
     49 #include <stdint.h>
     50 
     51 /*
     52  * Convert a string to an unsigned long long integer.
     53  *
     54  * Assumes that the upper and lower case
     55  * alphabets and digits are each contiguous.
     56  */
     57 ROKEN_LIB_FUNCTION unsigned long long ROKEN_LIB_CALL
     58 strtoull(const char * nptr, char ** endptr, int base)
     59 {
     60     const char *s;
     61     unsigned long long acc;
     62     char c;
     63     unsigned long long cutoff;
     64     int neg, any, cutlim;
     65 
     66     /*
     67      * See strtoq for comments as to the logic used.
     68      */
     69     s = nptr;
     70     do {
     71 	c = *s++;
     72     } while (isspace((unsigned char)c));
     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         ((s[1] >= '0' && s[1] <= '9') ||
     84         (s[1] >= 'A' && s[1] <= 'F') ||
     85         (s[1] >= 'a' && s[1] <= 'f'))) {
     86 	c = s[1];
     87 	s += 2;
     88 	base = 16;
     89     }
     90     if (base == 0)
     91 	base = c == '0' ? 8 : 10;
     92     acc = any = 0;
     93     if (base < 2 || base > 36)
     94 	goto noconv;
     95 
     96     cutoff = ULLONG_MAX / base;
     97     cutlim = ULLONG_MAX % base;
     98     for ( ; ; c = *s++) {
     99 	if (c >= '0' && c <= '9')
    100 	    c -= '0';
    101 	else if (c >= 'A' && c <= 'Z')
    102 	    c -= 'A' - 10;
    103 	else if (c >= 'a' && c <= 'z')
    104 	    c -= 'a' - 10;
    105 	else
    106 	    break;
    107 	if (c >= base)
    108 	    break;
    109 	if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
    110 	    any = -1;
    111 	else {
    112 	    any = 1;
    113 	    acc *= base;
    114 	    acc += c;
    115 	}
    116     }
    117     if (any < 0) {
    118 	acc = ULLONG_MAX;
    119 	errno = ERANGE;
    120     } else if (!any) {
    121 noconv:
    122 	errno = EINVAL;
    123     } else if (neg)
    124 	acc = -acc;
    125     if (endptr != NULL)
    126 	*endptr = (char *)(any ? s - 1 : nptr);
    127     return (acc);
    128 }
    129 
    130