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1 /*
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2 * Copyright (c) 1990 Regents of the University of California.
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3 * All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions
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7 * are met:
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 * 3. [rescinded 22 July 1999]
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14 * 4. Neither the name of the University nor the names of its contributors
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15 * may be used to endorse or promote products derived from this software
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16 * without specific prior written permission.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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28 * SUCH DAMAGE.
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29 */
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30
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31 #ifdef HAVE_CONFIG_H
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32 #include "config.h"
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33 #endif
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34 #ifdef HAVE_LIMITS_H
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35 #include <limits.h>
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36 #endif
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37 #ifdef HAVE_SYS_PARAM_H
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38 #include <sys/param.h>
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39 #endif
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40 #include <errno.h>
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41 #ifdef NEED_DECLARATION_ERRNO
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42 extern int errno;
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43 #endif
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44 #if 0
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45 #include <stdlib.h>
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46 #endif
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47 #include "ansidecl.h"
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48 #include "safe-ctype.h"
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49
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50 #ifndef ULONG_MAX
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51 #define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
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52 #endif
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53
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54 /*
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55 * Convert a string to an unsigned long integer.
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56 *
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57 * Ignores `locale' stuff. Assumes that the upper and lower case
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58 * alphabets and digits are each contiguous.
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59 */
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60 unsigned long
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61 strtoul(const char *nptr, char **endptr, register int base)
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62 {
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63 register const char *s = nptr;
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64 register unsigned long acc;
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65 register int c;
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66 register unsigned long cutoff;
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67 register int neg = 0, any, cutlim;
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68
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69 /*
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70 * See strtol for comments as to the logic used.
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71 */
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72 do {
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73 c = *s++;
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74 } while (ISSPACE(c));
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75 if (c == '-') {
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76 neg = 1;
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77 c = *s++;
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78 } else if (c == '+')
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79 c = *s++;
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80 if ((base == 0 || base == 16) &&
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81 c == '0' && (*s == 'x' || *s == 'X')) {
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82 c = s[1];
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83 s += 2;
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84 base = 16;
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85 }
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86 if (base == 0)
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87 base = c == '0' ? 8 : 10;
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88 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
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89 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
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90 for (acc = 0, any = 0;; c = *s++) {
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91 if (ISDIGIT(c))
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92 c -= '0';
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93 else if (ISALPHA(c))
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94 c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
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95 else
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96 break;
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97 if (c >= base)
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98 break;
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99 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
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100 any = -1;
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101 else {
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102 any = 1;
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103 acc *= base;
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104 acc += c;
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105 }
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106 }
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107 if (any < 0) {
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108 acc = ULONG_MAX;
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109 errno = ERANGE;
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110 } else if (neg)
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111 acc = -acc;
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112 if (endptr != 0)
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113 *endptr = (char *) (any ? s - 1 : nptr);
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114 return (acc);
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115 }
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