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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <ctype.h> 38 #include <errno.h> 39 #include <limits.h> 40 #include <wchar.h> 41 #include <wctype.h> 42 43 /* 44 * Convert a wide character string to an unsigned long integer. 45 */ 46 unsigned long 47 wcstoul(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base) 48 { 49 const wchar_t *s; 50 unsigned long acc; 51 wchar_t c; 52 unsigned long cutoff; 53 int neg, any, cutlim; 54 55 /* 56 * See strtol for comments as to the logic used. 57 */ 58 s = nptr; 59 do { 60 c = *s++; 61 } while (iswspace(c)); 62 if (c == L'-') { 63 neg = 1; 64 c = *s++; 65 } else { 66 neg = 0; 67 if (c == L'+') 68 c = *s++; 69 } 70 if ((base == 0 || base == 16) && 71 c == L'0' && (*s == L'x' || *s == L'X')) { 72 c = s[1]; 73 s += 2; 74 base = 16; 75 } 76 if (base == 0) 77 base = c == L'0' ? 8 : 10; 78 acc = any = 0; 79 if (base < 2 || base > 36) 80 goto noconv; 81 82 cutoff = ULONG_MAX / base; 83 cutlim = ULONG_MAX % base; 84 for ( ; ; c = *s++) { 85 #ifdef notyet 86 if (iswdigit(c)) 87 c = digittoint(c); 88 else 89 #endif 90 if (c >= L'0' && c <= L'9') 91 c -= L'0'; 92 else if (c >= L'A' && c <= L'Z') 93 c -= L'A' - 10; 94 else if (c >= L'a' && c <= L'z') 95 c -= L'a' - 10; 96 else 97 break; 98 if (c >= base) 99 break; 100 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 101 any = -1; 102 else { 103 any = 1; 104 acc *= base; 105 acc += c; 106 } 107 } 108 if (any < 0) { 109 acc = ULONG_MAX; 110 errno = ERANGE; 111 } else if (!any) { 112 noconv: 113 errno = EINVAL; 114 } else if (neg) 115 acc = -acc; 116 if (endptr != NULL) 117 *endptr = (wchar_t *)(any ? s - 1 : nptr); 118 return (acc); 119 } 120