1 /* $NetBSD: strtouq.c,v 1.14 2000/03/08 20:17:21 kleink 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 1.14 2000/03/08 20:17:21 kleink Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/types.h> 46 47 #include <assert.h> 48 #include <ctype.h> 49 #include <errno.h> 50 #include <limits.h> 51 #include <stdlib.h> 52 53 /* 54 * Convert a string to an unsigned quad integer. 55 * 56 * Ignores `locale' stuff. Assumes that the upper and lower case 57 * alphabets and digits are each contiguous. 58 */ 59 u_quad_t 60 strtouq(nptr, endptr, base) 61 const char *nptr; 62 char **endptr; 63 int base; 64 { 65 const char *s; 66 u_quad_t acc, cutoff; 67 int c; 68 int neg, any, cutlim; 69 70 _DIAGASSERT(nptr != NULL); 71 /* endptr may be NULL */ 72 73 #ifdef __GNUC__ 74 /* This outrageous construct just to shut up a GCC warning. */ 75 (void) &acc; 76 #endif 77 78 /* 79 * See strtoq for comments as to the logic used. 80 */ 81 s = nptr; 82 do { 83 c = (unsigned char) *s++; 84 } while (isspace(c)); 85 if (c == '-') { 86 neg = 1; 87 c = *s++; 88 } else { 89 neg = 0; 90 if (c == '+') 91 c = *s++; 92 } 93 if ((base == 0 || base == 16) && 94 c == '0' && (*s == 'x' || *s == 'X')) { 95 c = s[1]; 96 s += 2; 97 base = 16; 98 } 99 if (base == 0) 100 base = c == '0' ? 8 : 10; 101 102 cutoff = UQUAD_MAX / (u_quad_t)base; 103 cutlim = (int)(UQUAD_MAX % (u_quad_t)base); 104 for (acc = 0, any = 0;; c = (unsigned char) *s++) { 105 if (isdigit(c)) 106 c -= '0'; 107 else if (isalpha(c)) 108 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 109 else 110 break; 111 if (c >= base) 112 break; 113 if (any < 0) 114 continue; 115 if (acc > cutoff || (acc == cutoff && c > cutlim)) { 116 any = -1; 117 acc = UQUAD_MAX; 118 errno = ERANGE; 119 } else { 120 any = 1; 121 acc *= (u_quad_t)base; 122 acc += c; 123 } 124 } 125 if (neg && any > 0) 126 acc = -acc; 127 if (endptr != 0) 128 /* LINTED interface specification */ 129 *endptr = (char *)(any ? s - 1 : nptr); 130 return (acc); 131 } 132