1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD$ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/ctype.h> 42 #include <machine/limits.h> 43 44 /* 45 * Convert a string to an unsigned quad integer. 46 * 47 * Ignores `locale' stuff. Assumes that the upper and lower case 48 * alphabets and digits are each contiguous. 49 */ 50 u_quad_t 51 strtouq(const char *nptr, char **endptr, int base) 52 { 53 const char *s = nptr; 54 u_quad_t acc; 55 unsigned char c; 56 u_quad_t qbase, 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(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 qbase = (unsigned)base; 83 cutoff = (u_quad_t)UQUAD_MAX / qbase; 84 cutlim = (u_quad_t)UQUAD_MAX % qbase; 85 for (acc = 0, any = 0;; c = *s++) { 86 if (!isascii(c)) 87 break; 88 if (isdigit(c)) 89 c -= '0'; 90 else if (isalpha(c)) 91 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 92 else 93 break; 94 if (c >= base) 95 break; 96 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 97 any = -1; 98 else { 99 any = 1; 100 acc *= qbase; 101 acc += c; 102 } 103 } 104 if (any < 0) { 105 acc = UQUAD_MAX; 106 } else if (neg) 107 acc = -acc; 108 if (endptr != 0) 109 *((const char **)endptr) = any ? s - 1 : nptr; 110 return (acc); 111 } 112