1 /* $Id: strtoul.c,v 1.2 2005/07/07 16:34:06 dron Exp $ */
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33 static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
34 __RCSID("$NetBSD: strtoul.c,v 1.16 2003/08/07 16:43:45 agc Exp $");
43 * Convert a string to an unsigned long integer.
45 * Ignores `locale' stuff. Assumes that the upper and lower case
46 * alphabets and digits are each contiguous.
49 strtoul(const char *nptr, char **endptr, int base)
52 unsigned long acc, cutoff;
57 * See strtol for comments as to the logic used.
61 c = (unsigned char) *s++;
71 if ((base == 0 || base == 16) &&
72 c == '0' && (*s == 'x' || *s == 'X')) {
78 base = c == '0' ? 8 : 10;
80 cutoff = ULONG_MAX / (unsigned long)base;
81 cutlim = (int)(ULONG_MAX % (unsigned long)base);
82 for (acc = 0, any = 0;; c = (unsigned char) *s++) {
86 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
93 if (acc > cutoff || (acc == cutoff && c > cutlim)) {
99 acc *= (unsigned long)base;
106 /* LINTED interface specification */
107 *endptr = (char *)(any ? s - 1 : nptr);