1 /* $NetBSD: strtouq.c,v 1.18 2005/11/29 03:12:00 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)strtouq.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: strtouq.c,v 1.18 2005/11/29 03:12:00 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <sys/types.h> 42 43 #include <assert.h> 44 #include <ctype.h> 45 #include <errno.h> 46 #include <limits.h> 47 #include <stdlib.h> 48 49 /* 50 * Convert a string to an unsigned quad integer. 51 * 52 * Ignores `locale' stuff. Assumes that the upper and lower case 53 * alphabets and digits are each contiguous. 54 */ 55 u_quad_t 56 strtouq(nptr, endptr, base) 57 const char *nptr; 58 char **endptr; 59 int base; 60 { 61 const char *s; 62 u_quad_t acc, cutoff; 63 int c; 64 int neg, any, cutlim; 65 66 _DIAGASSERT(nptr != NULL); 67 /* endptr may be NULL */ 68 69 /* 70 * See strtoq for comments as to the logic used. 71 */ 72 s = nptr; 73 do { 74 c = (unsigned char) *s++; 75 } while (isspace(c)); 76 if (c == '-') { 77 neg = 1; 78 c = *s++; 79 } else { 80 neg = 0; 81 if (c == '+') 82 c = *s++; 83 } 84 if ((base == 0 || base == 16) && 85 c == '0' && (*s == 'x' || *s == 'X')) { 86 c = s[1]; 87 s += 2; 88 base = 16; 89 } 90 if (base == 0) 91 base = c == '0' ? 8 : 10; 92 93 cutoff = UQUAD_MAX / (u_quad_t)base; 94 cutlim = (int)(UQUAD_MAX % (u_quad_t)base); 95 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 96 if (isdigit(c)) 97 c -= '0'; 98 else if (isalpha(c)) 99 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 100 else 101 break; 102 if (c >= base) 103 break; 104 if (any < 0) 105 continue; 106 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 107 any = -1; 108 acc = UQUAD_MAX; 109 errno = ERANGE; 110 } else { 111 any = 1; 112 acc *= (u_quad_t)base; 113 acc += c; 114 } 115 } 116 if (neg && any > 0) 117 acc = -acc; 118 if (endptr != 0) 119 *endptr = __UNCONST(any ? s - 1 : nptr); 120 return (acc); 121 } 122