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34 * from @(#)strtol.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: head/lib/libc/stdlib/strtoimax.c 251672 2013-06-13 00:19:30Z emaste $
43 #include "xlocale_private.h"
46 * Convert a string to an intmax_t integer.
48 * Assumes that the upper and lower case
49 * alphabets and digits are each contiguous.
52 strtoimax_l(const char * __restrict nptr, char ** __restrict endptr, int base,
63 * Skip white space and pick up leading +/- sign if any.
64 * If base is 0, allow 0x for hex and 0 for octal, else
65 * assume decimal; if base is already 16, allow 0x.
70 } while (isspace_l((unsigned char)c, locale));
79 if ((base == 0 || base == 16) &&
80 c == '0' && (*s == 'x' || *s == 'X') &&
81 ((s[1] >= '0' && s[1] <= '9') ||
82 (s[1] >= 'A' && s[1] <= 'F') ||
83 (s[1] >= 'a' && s[1] <= 'f'))) {
89 base = c == '0' ? 8 : 10;
91 if (base < 2 || base > 36)
95 * Compute the cutoff value between legal numbers and illegal
96 * numbers. That is the largest legal value, divided by the
97 * base. An input number that is greater than this value, if
98 * followed by a legal input character, is too big. One that
99 * is equal to this value may be valid or not; the limit
100 * between valid and invalid numbers is then based on the last
101 * digit. For instance, if the range for intmax_t is
102 * [-9223372036854775808..9223372036854775807] and the input base
103 * is 10, cutoff will be set to 922337203685477580 and cutlim to
104 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
105 * accumulated a value > 922337203685477580, or equal but the
106 * next digit is > 7 (or 8), the number is too big, and we will
107 * return a range error.
109 * Set 'any' if any `digits' consumed; make it negative to indicate
112 cutoff = neg ? (uintmax_t)-(INTMAX_MIN + INTMAX_MAX) + INTMAX_MAX
114 cutlim = cutoff % base;
116 for ( ; ; c = *s++) {
117 if (c >= '0' && c <= '9')
119 else if (c >= 'A' && c <= 'Z')
121 else if (c >= 'a' && c <= 'z')
127 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
136 acc = neg ? INTMAX_MIN : INTMAX_MAX;
144 *endptr = (char *)(any ? s - 1 : nptr);
148 strtoimax(const char * __restrict nptr, char ** __restrict endptr, int base)
150 return strtoimax_l(nptr, endptr, base, __get_locale());