00001 /* 00002 * Copyright (C) 2004 by egnite Software GmbH. All rights reserved. 00003 * 00004 * Redistribution and use in source and binary forms, with or without 00005 * modification, are permitted provided that the following conditions 00006 * are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the copyright holders nor the names of 00014 * contributors may be used to endorse or promote products derived 00015 * from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS 00018 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00019 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00020 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE 00021 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00022 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00023 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 00024 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 00025 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00026 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00027 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00028 * SUCH DAMAGE. 00029 * 00030 * For additional information see http://www.ethernut.de/ 00031 * 00032 *- 00033 * Copyright (c) 1990 Regents of the University of California. 00034 * All rights reserved. 00035 * 00036 * Redistribution and use in source and binary forms, with or without 00037 * modification, are permitted provided that the following conditions 00038 * are met: 00039 * 1. Redistributions of source code must retain the above copyright 00040 * notice, this list of conditions and the following disclaimer. 00041 * 2. Redistributions in binary form must reproduce the above copyright 00042 * notice, this list of conditions and the following disclaimer in the 00043 * documentation and/or other materials provided with the distribution. 00044 * 3. Neither the name of the University nor the names of its contributors 00045 * may be used to endorse or promote products derived from this software 00046 * without specific prior written permission. 00047 * 00048 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00049 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00050 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00051 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00052 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00053 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00054 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00055 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00056 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00057 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00058 * SUCH DAMAGE. 00059 */ 00060 00061 /* 00062 * $Log: strtoul.c,v $ 00063 * Revision 1.3 2006/10/08 16:48:08 haraldkipp 00064 * Documentation fixed 00065 * 00066 * Revision 1.2 2005/08/02 17:46:47 haraldkipp 00067 * Major API documentation update. 00068 * 00069 * Revision 1.1 2004/09/08 10:23:35 haraldkipp 00070 * Generic C stdlib added 00071 * 00072 */ 00073 00074 #include <ctype.h> 00075 #include <errno.h> 00076 #include <limits.h> 00077 #include <stdlib.h> 00078 00083 00095 unsigned long strtoul(const char *nptr, char **endptr, int base) 00096 { 00097 register const char *s; 00098 register unsigned long acc, cutoff; 00099 register int c; 00100 register int neg, any, cutlim; 00101 00102 /* 00103 * See strtol for comments as to the logic used. 00104 */ 00105 s = nptr; 00106 do { 00107 c = (unsigned char) *s++; 00108 } while (isspace(c)); 00109 if (c == '-') { 00110 neg = 1; 00111 c = *s++; 00112 } else { 00113 neg = 0; 00114 if (c == '+') 00115 c = *s++; 00116 } 00117 if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X')) { 00118 c = s[1]; 00119 s += 2; 00120 base = 16; 00121 } 00122 if (base == 0) 00123 base = c == '0' ? 8 : 10; 00124 00125 cutoff = ULONG_MAX / (unsigned long) base; 00126 cutlim = ULONG_MAX % (unsigned long) base; 00127 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 00128 if (isdigit(c)) 00129 c -= '0'; 00130 else if (isalpha(c)) 00131 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 00132 else 00133 break; 00134 if (c >= base) 00135 break; 00136 if (any < 0) 00137 continue; 00138 if ((acc > cutoff || acc == cutoff) && c > cutlim) { 00139 any = -1; 00140 acc = ULONG_MAX; 00141 errno = ERANGE; 00142 } else { 00143 any = 1; 00144 acc *= (unsigned long) base; 00145 acc += c; 00146 } 00147 } 00148 if (neg && any > 0) 00149 acc = -acc; 00150 if (endptr != 0) 00151 *endptr = (char *) (any ? s - 1 : nptr); 00152 return (acc); 00153 } 00154