/*- * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. */ #if defined(LIBC_SCCS) && !defined(lint) static char rcsid[] = "$OpenBSD: strtoq.c,v 1.4 1996/08/19 08:33:52 tholo Exp $"; #endif /* LIBC_SCCS and not lint */ #include <sys/types.h> #include <ctype.h> #include <errno.h> #include <limits.h> #include <stdlib.h> /* * Convert a string to a quad integer. * * Ignores `locale' stuff. Assumes that the upper and lower case * alphabets and digits are each contiguous. */ quad_t strtoq(nptr, endptr, base) const char *nptr; char **endptr; register int base; { register const char *s; register quad_t acc, cutoff; register int c; register int neg, any, cutlim; /* * Skip white space and pick up leading +/- sign if any. * If base is 0, allow 0x for hex and 0 for octal, else * assume decimal; if base is already 16, allow 0x. */ 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')) { c = s[1]; s += 2; base = 16; } if (base == 0) base = c == '0' ? 8 : 10; /* * Compute the cutoff value between legal numbers and illegal * numbers. That is the largest legal value, divided by the * base. An input number that is greater than this value, if * followed by a legal input character, is too big. One that * is equal to this value may be valid or not; the limit * between valid and invalid numbers is then based on the last * digit. For instance, if the range for quads is * [-9223372036854775808..9223372036854775807] and the input base * is 10, cutoff will be set to 922337203685477580 and cutlim to * either 7 (neg==0) or 8 (neg==1), meaning that if we have * accumulated a value > 922337203685477580, or equal but the * next digit is > 7 (or 8), the number is too big, and we will * return a range error. * * Set any if any `digits' consumed; make it negative to indicate * overflow. */ cutoff = neg ? QUAD_MIN : QUAD_MAX; cutlim = cutoff % base; cutoff /= base; if (neg) { if (cutlim > 0) { cutlim -= base; cutoff += 1; } cutlim = -cutlim; } 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 (neg) { if (acc < cutoff || acc == cutoff && c > cutlim) { any = -1; acc = QUAD_MIN; errno = ERANGE; } else { any = 1; acc *= base; acc -= c; } } else { if (acc > cutoff || acc == cutoff && c > cutlim) { any = -1; acc = QUAD_MAX; errno = ERANGE; } else { any = 1; acc *= base; acc += c; } } } if (endptr != 0) *endptr = (char *) (any ? s - 1 : nptr); return (acc); }