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Add strtol() to libkern in support of some other work I'm doing.

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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! :-)
This commit is contained in:
jkh 1994-10-25 14:57:57 +00:00
parent fff1957107
commit 0b13b0b13d
2 changed files with 131 additions and 3 deletions
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6
sys/libkern/Makefile
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@ -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}

128
sys/libkern/strtol.c Normal file
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@ -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 <sys/types.h>
#include <machine/limits.h>
/*
* 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);
}