1 /* $NetBSD: strtouq.c,v 1.13 1999/09/20 04:39:42 lukem 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)strtouq.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: strtouq.c,v 1.13 1999/09/20 04:39:42 lukem Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 48 #include <assert.h> 49 #include <ctype.h> 50 #include <errno.h> 51 #include <limits.h> 52 #include <stdlib.h> 53 54 #ifdef __weak_alias 55 __weak_alias(strtouq, _strtouq) 56 #endif 57 58 /* 59 * Convert a string to an unsigned quad integer. 60 * 61 * Ignores `locale' stuff. Assumes that the upper and lower case 62 * alphabets and digits are each contiguous. 63 */ 64 u_quad_t 65 _strtouq(nptr, endptr, base) 66 const char *nptr; 67 char **endptr; 68 int base; 69 { 70 const char *s; 71 u_quad_t acc, cutoff; 72 int c; 73 int neg, any, cutlim; 74 75 _DIAGASSERT(nptr != NULL); 76 /* endptr may be NULL */ 77 78 #ifdef __GNUC__ 79 /* This outrageous construct just to shut up a GCC warning. */ 80 (void) &acc; 81 #endif 82 83 /* 84 * See strtoq for comments as to the logic used. 85 */ 86 s = nptr; 87 do { 88 c = (unsigned char) *s++; 89 } while (isspace(c)); 90 if (c == '-') { 91 neg = 1; 92 c = *s++; 93 } else { 94 neg = 0; 95 if (c == '+') 96 c = *s++; 97 } 98 if ((base == 0 || base == 16) && 99 c == '0' && (*s == 'x' || *s == 'X')) { 100 c = s[1]; 101 s += 2; 102 base = 16; 103 } 104 if (base == 0) 105 base = c == '0' ? 8 : 10; 106 107 cutoff = UQUAD_MAX / (u_quad_t)base; 108 cutlim = (int)(UQUAD_MAX % (u_quad_t)base); 109 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 110 if (isdigit(c)) 111 c -= '0'; 112 else if (isalpha(c)) 113 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 114 else 115 break; 116 if (c >= base) 117 break; 118 if (any < 0) 119 continue; 120 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 121 any = -1; 122 acc = UQUAD_MAX; 123 errno = ERANGE; 124 } else { 125 any = 1; 126 acc *= (u_quad_t)base; 127 acc += c; 128 } 129 } 130 if (neg && any > 0) 131 acc = -acc; 132 if (endptr != 0) 133 /* LINTED interface specification */ 134 *endptr = (char *)(any ? s - 1 : nptr); 135 return (acc); 136 } 137