From 0b13b0b13de069a8089042efc4eacd25f3441e40 Mon Sep 17 00:00:00 2001 From: jkh Date: Tue, 25 Oct 1994 14:57:57 +0000 Subject: [PATCH] Add strtol() to libkern in support of some other work I'm doing. I just know I'm going to get flamed for adding for the miserable abortion that is libkern, but what am I supposed to do? At least I didn't drag in the ctype stuff! :-) --- sys/libkern/Makefile | 6 +- sys/libkern/strtol.c | 128 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 131 insertions(+), 3 deletions(-) create mode 100644 sys/libkern/strtol.c diff --git a/sys/libkern/Makefile b/sys/libkern/Makefile index c910523abff2..27164d848cb3 100644 --- a/sys/libkern/Makefile +++ b/sys/libkern/Makefile @@ -1,13 +1,13 @@ # @(#)Makefile 7.9 (Berkeley) 6/1/93 -# $Id: Makefile,v 1.2 1994/08/02 07:43:40 davidg Exp $ +# $Id: Makefile,v 1.3 1994/09/15 15:41:47 paul Exp $ LIB= kern CFLAGS+= -I${.CURDIR} -I${.CURDIR}/.. -DKERNEL SRCS= adddi3.c anddi3.c ashldi3.c ashrdi3.c bcmp.c cmpdi2.c divdi3.c \ ffs.c iordi3.c locc.c lshldi3.c lshrdi3.c mcount.c moddi3.c \ muldi3.c negdi2.c notdi2.c qdivrem.c random.c rindex.c scanc.c \ - skpc.c strcat.c strcmp.c strcpy.c strlen.c strncpy.c subdi3.c \ - ucmpdi2.c udivdi3.c umoddi3.c xordi3.c + skpc.c strcat.c strcmp.c strcpy.c strlen.c strncpy.c strtol.c \ + subdi3.c ucmpdi2.c udivdi3.c umoddi3.c xordi3.c .if exists(${.CURDIR}/${MACHINE}/Makefile.inc) .PATH: ${.CURDIR}/${MACHINE} diff --git a/sys/libkern/strtol.c b/sys/libkern/strtol.c new file mode 100644 index 000000000000..9c257dabf25e --- /dev/null +++ b/sys/libkern/strtol.c @@ -0,0 +1,128 @@ +/*- + * Copyright (c) 1990, 1993 + * 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 sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include +#include + + +/* + * Convert a string to a long integer. + * + * Ignores `locale' stuff. Assumes that the upper and lower case + * alphabets and digits are each contiguous. + * + * Slightly lobotomized for inclusion in libkern. + */ +long +strtol(nptr, endptr, base) + const char *nptr; + char **endptr; + register int base; +{ + register const char *s = nptr; + register unsigned long acc; + register int c; + register unsigned long cutoff; + register int neg = 0, 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. + */ + do { + c = *s++; + } while (c == ' ' || c == '\t'); + if (c == '-') { + neg = 1; + c = *s++; + } else 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 longs is + * [-2147483648..2147483647] and the input base is 10, + * cutoff will be set to 214748364 and cutlim to either + * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated + * a value > 214748364, 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 ? -(unsigned long)LONG_MIN : LONG_MAX; + cutlim = cutoff % (unsigned long)base; + cutoff /= (unsigned long)base; + for (acc = 0, any = 0;; c = *s++) { + if (c >= '0' && c <= '9') + c -= '0'; + else if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) + c -= (c >= 'A' && c <= 'Z') ? 'A' - 10 : 'a' - 10; + else + break; + if (c >= base) + break; + if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim) + any = -1; + else { + any = 1; + acc *= base; + acc += c; + } + } + if (any < 0) { + acc = neg ? LONG_MIN : LONG_MAX; + } else if (neg) + acc = -acc; + if (endptr != 0) + *endptr = (char *)(any ? s - 1 : nptr); + return (acc); +}