/* $OpenBSD: strtoumax.c,v 1.4 2017/07/06 16:23:11 millert Exp $ */ /* * Copyright (c) 1992 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include /* * Convert a string to a uintmax_t. * * Ignores `locale' stuff. Assumes that the upper and lower case * alphabets and digits are each contiguous. */ uintmax_t strtoumax(const char *nptr, char **endptr, int base) { const char *s; uintmax_t acc, cutoff; int c; int neg, any, cutlim; /* * See strtoimax for comments as to the logic used. */ if (base < 0 || base == 1 || base > 36) { if (endptr != 0) *endptr = (char *)nptr; errno = EINVAL; return 0; } s = nptr; do { c = (unsigned char) *s++; } while (isspace(c)); if (c == '-') { neg = 1; c = *s++; } else { neg = 0; if (c == '+') c = *s++; } if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X') && isxdigit((unsigned char)s[1])) { c = s[1]; s += 2; base = 16; } if (base == 0) base = c == '0' ? 8 : 10; cutoff = UINTMAX_MAX / (uintmax_t)base; cutlim = UINTMAX_MAX % (uintmax_t)base; for (acc = 0, any = 0;; c = (unsigned char) *s++) { if (isdigit(c)) c -= '0'; else if (isalpha(c)) c -= isupper(c) ? 'A' - 10 : 'a' - 10; else break; if (c >= base) break; if (any < 0) continue; if (acc > cutoff || (acc == cutoff && c > cutlim)) { any = -1; acc = UINTMAX_MAX; errno = ERANGE; } else { any = 1; acc *= (uintmax_t)base; acc += c; } } if (neg && any > 0) acc = -acc; if (endptr != 0) *endptr = (char *) (any ? s - 1 : nptr); return (acc); } DEF_STRONG(strtoumax);