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Add strtol & strtoul to kernel. Derived from libc versions.

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This commit is contained in:
Poul-Henning Kamp 1999-11-01 15:04:04 +00:00
parent ce4a64f787
commit bf9deaba10
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=52757
2 changed files with 160 additions and 1 deletions
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157
sys/kern/subr_scanf.c
View File

@ -35,6 +35,8 @@
*
* $FreeBSD$
* From: Id: vfscanf.c,v 1.13 1998/09/25 12:20:27 obrien Exp
* From: static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93";
* From: static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
*/
#include <sys/param.h>
@ -790,3 +792,158 @@ strtoq(const char *nptr, const char **endptr, int base)
*endptr = (const char *)(any ? s - 1 : nptr);
return (acc);
}
/*
* Convert a string to a long integer.
*
* Ignores `locale' stuff. Assumes that the upper and lower case
* alphabets and digits are each contiguous.
*/
long
strtol(nptr, endptr, base)
const char *nptr;
const char **endptr;
int base;
{
const char *s = nptr;
unsigned long acc;
unsigned char c;
unsigned long cutoff;
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 (isspace(c));
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 (!isascii(c))
break;
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 || 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 = (const char *)(any ? s - 1 : nptr);
return (acc);
}
/*
* Convert a string to an unsigned long integer.
*
* Ignores `locale' stuff. Assumes that the upper and lower case
* alphabets and digits are each contiguous.
*/
unsigned long
strtoul(nptr, endptr, base)
const char *nptr;
const char **endptr;
int base;
{
const char *s = nptr;
unsigned long acc;
unsigned char c;
unsigned long cutoff;
int neg = 0, any, cutlim;
/*
* See strtol for comments as to the logic used.
*/
do {
c = *s++;
} while (isspace(c));
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;
cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
for (acc = 0, any = 0;; c = *s++) {
if (!isascii(c))
break;
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 || acc > cutoff || (acc == cutoff && c > cutlim))
any = -1;
else {
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0) {
acc = ULONG_MAX;
} else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (const char *)(any ? s - 1 : nptr);
return (acc);
}

4
sys/sys/systm.h
View File

@ -119,8 +119,10 @@ int vsprintf __P((char *buf, const char *, _BSD_VA_LIST_)) __printflike(2, 0
int ttyprintf __P((struct tty *, const char *, ...)) __printflike(2, 3);
int sscanf __P((const char *, char const *, ...));
int vsscanf __P((const char *, char const *, _BSD_VA_LIST_));
u_quad_t strtouq __P((const char *, const char **, int));
long strtol __P((const char *, const char **, int base));
u_long strtoul __P((const char *, const char **, int base));
quad_t strtoq __P((const char *, const char **, int base));
u_quad_t strtouq __P((const char *, const char **, int base));
void bcopy __P((const void *from, void *to, size_t len));
void ovbcopy __P((const void *from, void *to, size_t len));