37 lines
633 B
C
37 lines
633 B
C
/* $NetBSD: atouint.c,v 1.2 1998/01/09 03:15:52 perry Exp $ */
|
|
|
|
/*
|
|
* atouint - convert an ascii string to an unsigned long, with error checking
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <ctype.h>
|
|
|
|
#include "ntp_types.h"
|
|
#include "ntp_stdlib.h"
|
|
|
|
int
|
|
atouint(str, uval)
|
|
const char *str;
|
|
u_long *uval;
|
|
{
|
|
register u_long u;
|
|
register const char *cp;
|
|
|
|
cp = str;
|
|
if (*cp == '\0')
|
|
return 0;
|
|
|
|
u = 0;
|
|
while (*cp != '\0') {
|
|
if (!isdigit(*cp))
|
|
return 0;
|
|
if (u > 429496729 || (u == 429496729 && *cp >= '6'))
|
|
return 0; /* overflow */
|
|
u = (u << 3) + (u << 1);
|
|
u += *cp++ - '0'; /* ascii dependent */
|
|
}
|
|
|
|
*uval = u;
|
|
return 1;
|
|
}
|