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+/* $FreeBSD$ */
+/* $NetBSD: _strtol.h,v 1.2 2009/05/20 22:03:29 christos Exp $ */
+
+/*-
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Original version ID:
+ * NetBSD: src/lib/libc/locale/_wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp
+ */
+
+/*
+ * function template for strtol, strtoll and strtoimax.
+ *
+ * parameters:
+ * _FUNCNAME : function name
+ * __INT : return type
+ * __INT_MIN : lower limit of the return type
+ * __INT_MAX : upper limit of the return type
+ */
+
+__INT
+_FUNCNAME(const char *nptr, char **endptr, int base)
+{
+ const char *s;
+ __INT acc, cutoff;
+ unsigned char c;
+ int any, cutlim, i, neg;
+
+ /* check base value */
+ if (base && (base < 2 || base > 36)) {
+#if !defined(_KERNEL) && !defined(_STANDALONE)
+ errno = EINVAL;
+ if (endptr != NULL)
+ /* LINTED interface specification */
+ *endptr = __DECONST(void *, nptr);
+ return (0);
+#else
+ panic("%s: invalid base %d", __func__, base);
+#endif
+ }
+
+ /*
+ * Skip white space and pick up leading +/- sign if any.
+ * If base is 0, allow 0x for hex and 0 for octal, else
+ * assume decimal; if base is already 16, allow 0x.
+ */
+ s = nptr;
+ do {
+ c = *s++;
+ } while (isspace(c));
+ if (c == '-') {
+ neg = 1;
+ c = *s++;
+ } else {
+ neg = 0;
+ if (c == '+')
+ c = *s++;
+ }
+ if ((base == 0 || base == 16) &&
+ c == '0' && (*s == 'x' || *s == 'X')) {
+ c = s[1];
+ s += 2;
+ base = 16;
+ }
+ if (base == 0)
+ base = (c == '0' ? 8 : 10);
+
+ /*
+ * Compute the cutoff value between legal numbers and illegal
+ * numbers. That is the largest legal value, divided by the
+ * base. An input number that is greater than this value, if
+ * followed by a legal input character, is too big. One that
+ * is equal to this value may be valid or not; the limit
+ * between valid and invalid numbers is then based on the last
+ * digit. For instance, if the range for longs is
+ * [-2147483648..2147483647] and the input base is 10,
+ * cutoff will be set to 214748364 and cutlim to either
+ * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
+ * a value > 214748364, or equal but the next digit is > 7 (or 8),
+ * the number is too big, and we will return a range error.
+ *
+ * Set any if any `digits' consumed; make it negative to indicate
+ * overflow.
+ */
+ cutoff = (neg ? __INT_MIN : __INT_MAX);
+ cutlim = (int)(cutoff % base);
+ cutoff /= base;
+ if (neg) {
+ if (cutlim > 0) {
+ cutlim -= base;
+ cutoff += 1;
+ }
+ cutlim = -cutlim;
+ }
+ for (acc = 0, any = 0;; c = *s++) {
+ if (isdigit(c))
+ i = c - '0';
+ else if (isalpha(c))
+ i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
+ else
+ break;
+ if (i >= base)
+ break;
+ if (any < 0)
+ continue;
+ if (neg) {
+ if (acc < cutoff || (acc == cutoff && i > cutlim)) {
+ acc = __INT_MIN;
+#if !defined(_KERNEL) && !defined(_STANDALONE)
+ any = -1;
+ errno = ERANGE;
+#else
+ any = 0;
+ break;
+#endif
+ } else {
+ any = 1;
+ acc *= base;
+ acc -= i;
+ }
+ } else {
+ if (acc > cutoff || (acc == cutoff && i > cutlim)) {
+ acc = __INT_MAX;
+#if !defined(_KERNEL) && !defined(_STANDALONE)
+ any = -1;
+ errno = ERANGE;
+#else
+ any = 0;
+ break;
+#endif
+ } else {
+ any = 1;
+ acc *= base;
+ acc += i;
+ }
+ }
+ }
+ if (endptr != NULL)
+ /* LINTED interface specification */
+ *endptr = __DECONST(void *, any ? s - 1 : nptr);
+ return(acc);
+}
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