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

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32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)strtouq.c 8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37
38#ifndef lint
39static const char rcsid[] =
40 "$FreeBSD: head/lib/libc/stdlib/strtoull.c 73152 2001-02-27 13:33:07Z obrien $";
41#endif
42
43#include <sys/types.h>
44
45#include <limits.h>
46#include <errno.h>
47#include <ctype.h>
48#include <stdlib.h>
49
50/*
51 * Convert a string to an unsigned long long integer.
52 *
53 * Ignores `locale' stuff. Assumes that the upper and lower case
54 * alphabets and digits are each contiguous.
55 */
56unsigned long long
57strtoull(nptr, endptr, base)
58 const char *nptr;
59 char **endptr;
60 register int base;
61{
62 register const char *s = nptr;
63 register unsigned long long acc;
64 register unsigned char c;
65 register unsigned long long qbase, cutoff;
66 register int neg, any, cutlim;
67
68 /*
69 * See strtoq for comments as to the logic used.
70 */
71 s = nptr;
72 do {
73 c = *s++;

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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 qbase = (unsigned)base;
92 cutoff = (unsigned long long)ULLONG_MAX / qbase;
93 cutlim = (unsigned long long)ULLONG_MAX % qbase;
94 for (acc = 0, any = 0;; c = *s++) {
95 if (!isascii(c))
96 break;
97 if (isdigit(c))
98 c -= '0';
99 else if (isalpha(c))
100 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
101 else
102 break;
103 if (c >= base)
104 break;
105 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
106 any = -1;
107 else {
108 any = 1;
109 acc *= qbase;
110 acc += c;
111 }
112 }
113 if (any < 0) {
114 acc = ULLONG_MAX;
115 errno = ERANGE;
116 } else if (neg)
117 acc = -acc;
118 if (endptr != 0)
119 *endptr = (char *)(any ? s - 1 : nptr);
120 return (acc);
121}