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33 * @(#)strtoq.c 8.1 (Berkeley) 6/4/93
34 * $FreeBSD: src/lib/libc/stdlib/strtoll.c,v 1.5.2.1 2001/03/02 09:45:20 obrien Exp $
35 * $DragonFly: src/lib/libc/stdlib/strtoll.c,v 1.3 2003/09/06 08:10:46 asmodai Exp $
38 #include <sys/types.h>
46 * Convert a string to a long long integer.
48 * Ignores `locale' stuff. Assumes that the upper and lower case
49 * alphabets and digits are each contiguous.
52 strtoll(nptr, endptr, base)
58 unsigned long long acc;
60 unsigned long long qbase, cutoff;
64 * Skip white space and pick up leading +/- sign if any.
65 * If base is 0, allow 0x for hex and 0 for octal, else
66 * assume decimal; if base is already 16, allow 0x.
80 if ((base == 0 || base == 16) &&
81 c == '0' && (*s == 'x' || *s == 'X')) {
87 base = c == '0' ? 8 : 10;
90 * Compute the cutoff value between legal numbers and illegal
91 * numbers. That is the largest legal value, divided by the
92 * base. An input number that is greater than this value, if
93 * followed by a legal input character, is too big. One that
94 * is equal to this value may be valid or not; the limit
95 * between valid and invalid numbers is then based on the last
96 * digit. For instance, if the range for quads is
97 * [-9223372036854775808..9223372036854775807] and the input base
98 * is 10, cutoff will be set to 922337203685477580 and cutlim to
99 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
100 * accumulated a value > 922337203685477580, or equal but the
101 * next digit is > 7 (or 8), the number is too big, and we will
102 * return a range error.
104 * Set any if any `digits' consumed; make it negative to indicate
107 qbase = (unsigned)base;
108 cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX
110 cutlim = cutoff % qbase;
112 for (acc = 0, any = 0;; c = *s++) {
118 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
123 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
132 acc = neg ? LLONG_MIN : LLONG_MAX;
137 *endptr = (char *)(any ? s - 1 : nptr);