2 * Copyright (c) 1990 The Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <net-snmp/net-snmp-config.h>
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char sccsid[] = "@(#)strtol.c 5.4 (Berkeley) 2/23/91";
38 #endif /* LIBC_SCCS and not lint */
52 * Convert a string to a long integer.
54 * Ignores `locale' stuff. Assumes that the upper and lower case
55 * alphabets and digits are each contiguous.
58 strtol(const char *nptr, char **endptr, int base)
64 int neg = 0, any, cutlim;
67 * Skip white space and pick up leading +/- sign if any. If base is 0,
68 * allow 0x for hex and 0 for octal, else assume decimal; if base is
69 * already 16, allow 0x.
79 if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X')) {
85 base = c == '0' ? 8 : 10;
88 * Compute the cutoff value between legal numbers and illegal numbers.
89 * That is the largest legal value, divided by the base. An input
90 * number that is greater than this value, if followed by a legal
91 * input character, is too big. One that is equal to this value may
92 * be valid or not; the limit between valid and invalid numbers is
93 * then based on the last digit. For instance, if the range for longs
94 * is [-2147483648..2147483647] and the input base is 10, cutoff will
95 * be set to 214748364 and cutlim to either 7 (neg==0) or 8 (neg==1),
96 * meaning that if we have accumulated a value > 214748364, or equal
97 * but the next digit is > 7 (or 8), the number is too big, and we
98 * will return a range error.
100 * Set any if any `digits' consumed; make it negative to indicate
103 cutoff = neg ? -(unsigned long) LONG_MIN : LONG_MAX;
104 cutlim = cutoff % (unsigned long) base;
105 cutoff /= (unsigned long) base;
106 for (acc = 0, any = 0;; c = *s++) {
110 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
115 if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim)
124 acc = neg ? LONG_MIN : LONG_MAX;
129 *endptr = any ? s - 1 : (char *) nptr;
133 #endif /* !HAVE_STRTOL */