[unix-history] / contrib / xntpd / lib / atouint.c

/* atouint.c,v 3.1 1993/07/06 01:07:42 jbj Exp
 * atouint - convert an ascii string to an unsigned long, with error checking
 */
#include <sys/types.h>
#include <ctype.h>

#include "ntp_types.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;
}
Commit	Line	Data
09169146 GW	1	/* atouint.c,v 3.1 1993/07/06 01:07:42 jbj Exp
	2	* atouint - convert an ascii string to an unsigned long, with error checking
	3	*/
	4	#include <sys/types.h>
	5	#include <ctype.h>
	6
	7	#include "ntp_types.h"
	8
	9	int
	10	atouint(str, uval)
	11	const char *str;
	12	U_LONG *uval;
	13	{
	14	register U_LONG u;
	15	register const char *cp;
	16
	17	cp = str;
	18	if (*cp == '\0')
	19	return 0;
	20
	21	u = 0;
	22	while (*cp != '\0') {
	23	if (!isdigit(*cp))
	24	return 0;
	25	if (u > 429496729 \|\| (u == 429496729 && *cp >= '6'))
	26	return 0; /* overflow */
	27	u = (u << 3) + (u << 1);
	28	u += cp++ - '0'; / ascii dependent */
	29	}
	30
	31	*uval = u;
	32	return 1;
	33	}