1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 20 * 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 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 35 #include <limits.h> 36 #include <errno.h> 37 #include <ctype.h> 38 #include <stdlib.h> 39 40 #include <errno_private.h> 41 42 43 /* 44 * Convert a string to an unsigned long long integer. 45 * 46 * Assumes that the upper and lower case 47 * alphabets and digits are each contiguous. 48 */ 49 50 unsigned long long 51 strtoull(const char * __restrict nptr, char ** __restrict endptr, int base) 52 { 53 const char *s; 54 unsigned long long acc; 55 char c; 56 unsigned long long cutoff; 57 int neg, any, cutlim; 58 59 /* 60 * See strtoq for comments as to the logic used. 61 */ 62 s = nptr; 63 do { 64 c = *s++; 65 } while (isspace((unsigned char)c)); 66 if (c == '-') { 67 neg = 1; 68 c = *s++; 69 } else { 70 neg = 0; 71 if (c == '+') 72 c = *s++; 73 } 74 if ((base == 0 || base == 16) && 75 c == '0' && (*s == 'x' || *s == 'X')) { 76 c = s[1]; 77 s += 2; 78 base = 16; 79 } 80 if (base == 0) 81 base = c == '0' ? 8 : 10; 82 acc = any = 0; 83 if (base < 2 || base > 36) 84 goto noconv; 85 86 cutoff = ULONGLONG_MAX / base; 87 cutlim = ULONGLONG_MAX % base; 88 for ( ; ; c = *s++) { 89 if (c >= '0' && c <= '9') 90 c -= '0'; 91 else if (c >= 'A' && c <= 'Z') 92 c -= 'A' - 10; 93 else if (c >= 'a' && c <= 'z') 94 c -= 'a' - 10; 95 else 96 break; 97 if (c >= base) 98 break; 99 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 100 any = -1; 101 else { 102 any = 1; 103 acc *= base; 104 acc += c; 105 } 106 } 107 if (any < 0) { 108 acc = ULONGLONG_MAX; 109 __set_errno(ERANGE); 110 } else if (!any) { 111 noconv: 112 __set_errno(EINVAL); 113 } else if (neg) 114 acc = -acc; 115 if (endptr != NULL) 116 *endptr = (char *)(any ? s - 1 : nptr); 117 118 return acc; 119 } 120 121 122 unsigned long long __strtoull_internal(const char *number, char **_end, int base, int group); 123 124 unsigned long long 125 __strtoull_internal(const char *number, char **_end, int base, int group) 126 { 127 // ToDo: group is currently not supported! 128 (void)group; 129 130 return strtoull(number, _end, base); 131 } 132 133