56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
/* $Header$ */
|
|
|
|
#include <ctype.h>
|
|
|
|
long int
|
|
strtol(nptr, endptr, base)
|
|
register char *nptr;
|
|
char **endptr;
|
|
{
|
|
register int v;
|
|
register long val = 0;
|
|
register int c;
|
|
int sign = 1;
|
|
char *startnptr = nptr, *nrstart;
|
|
|
|
if (endptr) *endptr = (char *)nptr;
|
|
while (isspace(*nptr)) nptr++;
|
|
c = *nptr;
|
|
|
|
if (c == '-' || c == '+') {
|
|
if (c == '-') sign = -1;
|
|
nptr++;
|
|
}
|
|
nrstart = nptr; /* start of the number */
|
|
|
|
/* When base is 0, the syntax determines the actual base */
|
|
if (base == 0)
|
|
if (*nptr == '0')
|
|
if (*++nptr == 'x' || *nptr == 'X') {
|
|
base = 16;
|
|
nptr++;
|
|
}
|
|
else base = 8;
|
|
else base = 10;
|
|
else if (base==16 && *nptr=='0' && (*++nptr =='x' || *nptr =='X'))
|
|
nptr++;
|
|
|
|
while (isdigit(c = *nptr) || isalpha(c)) {
|
|
if (isalpha(c))
|
|
v = 10 + (isupper(c) ? c - 'A' : c - 'a');
|
|
else
|
|
v = c - '0';
|
|
if (v >= base) break;
|
|
val = (val * base) + v;
|
|
nptr++;
|
|
}
|
|
if (endptr) {
|
|
if (nrstart == nptr) *endptr = (char *)startnptr;
|
|
else *endptr = (char *)nptr;
|
|
}
|
|
return (long) sign * val;
|
|
}
|