1 /* 2 * Copyright (c) 1990, 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <ctype.h> 34 #include <errno.h> 35 #include <limits.h> 36 #include <wchar.h> 37 #include <wctype.h> 38 39 /* 40 * Convert a wide character string to an unsigned long integer. 41 */ 42 unsigned long 43 wcstoul(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base) 44 { 45 const wchar_t *s; 46 unsigned long acc; 47 wchar_t c; 48 unsigned long cutoff; 49 int neg, any, cutlim; 50 51 /* 52 * See strtol for comments as to the logic used. 53 */ 54 s = nptr; 55 do { 56 c = *s++; 57 } while (iswspace(c)); 58 if (c == L'-') { 59 neg = 1; 60 c = *s++; 61 } else { 62 neg = 0; 63 if (c == L'+') 64 c = *s++; 65 } 66 if ((base == 0 || base == 16) && 67 c == L'0' && (*s == L'x' || *s == L'X')) { 68 c = s[1]; 69 s += 2; 70 base = 16; 71 } 72 if (base == 0) 73 base = c == L'0' ? 8 : 10; 74 acc = any = 0; 75 if (base < 2 || base > 36) 76 goto noconv; 77 78 cutoff = ULONG_MAX / base; 79 cutlim = ULONG_MAX % base; 80 for ( ; ; c = *s++) { 81 #ifdef notyet 82 if (iswdigit(c)) 83 c = digittoint(c); 84 else 85 #endif 86 if (c >= L'0' && c <= L'9') 87 c -= L'0'; 88 else if (c >= L'A' && c <= L'Z') 89 c -= L'A' - 10; 90 else if (c >= L'a' && c <= L'z') 91 c -= L'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 *= base; 101 acc += c; 102 } 103 } 104 if (any < 0) { 105 acc = ULONG_MAX; 106 errno = ERANGE; 107 } else if (!any) { 108 noconv: 109 errno = EINVAL; 110 } else if (neg) 111 acc = -acc; 112 if (endptr != NULL) 113 *endptr = (wchar_t *)(any ? s - 1 : nptr); 114 return (acc); 115 } 116