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Annotation of embedaddon/ntp/lib/isc/strtoul.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
                      3:  * Copyright (C) 2003  Internet Software Consortium.
                      4:  *
                      5:  * Permission to use, copy, modify, and/or distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
                     10:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
                     11:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
                     12:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
                     13:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
                     14:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
                     15:  * PERFORMANCE OF THIS SOFTWARE.
                     16:  */
                     17: 
                     18: /*
                     19:  * Copyright (c) 1990, 1993
                     20:  *     The Regents of the University of California.  All rights reserved.
                     21:  *
                     22:  * Redistribution and use in source and binary forms, with or without
                     23:  * modification, are permitted provided that the following conditions
                     24:  * are met:
                     25:  * 1. Redistributions of source code must retain the above copyright
                     26:  *    notice, this list of conditions and the following disclaimer.
                     27:  * 2. Redistributions in binary form must reproduce the above copyright
                     28:  *    notice, this list of conditions and the following disclaimer in the
                     29:  *    documentation and/or other materials provided with the distribution.
                     30:  * 3. All advertising materials mentioning features or use of this software
                     31:  *    must display the following acknowledgement:
                     32:  *     This product includes software developed by the University of
                     33:  *     California, Berkeley and its contributors.
                     34:  * 4. Neither the name of the University nor the names of its contributors
                     35:  *    may be used to endorse or promote products derived from this software
                     36:  *    without specific prior written permission.
                     37:  *
                     38:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     39:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     40:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     41:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     42:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     43:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     44:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     45:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     46:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     47:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     48:  * SUCH DAMAGE.
                     49:  */
                     50: 
                     51: /*! \file */
                     52: #if defined(LIBC_SCCS) && !defined(lint)
                     53: static char sccsid[] = "@(#)strtoul.c  8.1 (Berkeley) 6/4/93";
                     54: #endif /* LIBC_SCCS and not lint */
                     55: 
                     56: /* $Id: strtoul.c,v 1.7 2007/06/19 23:47:17 tbox Exp $ */
                     57: 
                     58: #include <config.h>
                     59: 
                     60: #include <limits.h>
                     61: #include <ctype.h>
                     62: #include <errno.h>
                     63: 
                     64: #include <isc/stdlib.h>
                     65: #include <isc/util.h>
                     66: 
                     67: /*!
                     68:  * Convert a string to an unsigned long integer.
                     69:  *
                     70:  * Ignores `locale' stuff.  Assumes that the upper and lower case
                     71:  * alphabets and digits are each contiguous.
                     72:  */
                     73: unsigned long
                     74: isc_strtoul(const char *nptr, char **endptr, int base) {
                     75:        const char *s = nptr;
                     76:        unsigned long acc;
                     77:        unsigned char c;
                     78:        unsigned long cutoff;
                     79:        int neg = 0, any, cutlim;
                     80: 
                     81:        /*
                     82:         * See strtol for comments as to the logic used.
                     83:         */
                     84:        do {
                     85:                c = *s++;
                     86:        } while (isspace(c));
                     87:        if (c == '-') {
                     88:                neg = 1;
                     89:                c = *s++;
                     90:        } else if (c == '+')
                     91:                c = *s++;
                     92:        if ((base == 0 || base == 16) &&
                     93:            c == '0' && (*s == 'x' || *s == 'X')) {
                     94:                c = s[1];
                     95:                s += 2;
                     96:                base = 16;
                     97:        }
                     98:        if (base == 0)
                     99:                base = c == '0' ? 8 : 10;
                    100:        cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
                    101:        cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
                    102:        for (acc = 0, any = 0;; c = *s++) {
                    103:                if (!isascii(c))
                    104:                        break;
                    105:                if (isdigit(c))
                    106:                        c -= '0';
                    107:                else if (isalpha(c))
                    108:                        c -= isupper(c) ? 'A' - 10 : 'a' - 10;
                    109:                else
                    110:                        break;
                    111:                if (c >= base)
                    112:                        break;
                    113:                if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
                    114:                        any = -1;
                    115:                else {
                    116:                        any = 1;
                    117:                        acc *= base;
                    118:                        acc += c;
                    119:                }
                    120:        }
                    121:        if (any < 0) {
                    122:                acc = ULONG_MAX;
                    123:                errno = ERANGE;
                    124:        } else if (neg)
                    125:                acc = -acc;
                    126:        if (endptr != 0)
                    127:                DE_CONST(any ? s - 1 : nptr, *endptr);
                    128:        return (acc);
                    129: }