octtoint.c revision 290001 
1/*
2 * octtoint - convert an ascii string in octal to an unsigned
3 *	      long, with error checking
4 */
5#include <config.h>
6#include <stdio.h>
7#include <ctype.h>
8
9#include "ntp_stdlib.h"
10
11int
12octtoint(
13	const char *str,
14	u_long *ival
15	)
16{
17	register u_long u;
18	register const char *cp;
19
20	cp = str;
21
22	if (*cp == '\0')
23	    return 0;
24
25	u = 0;
26	while (*cp != '\0') {
27		if (!isdigit((unsigned char)*cp) || *cp == '8' || *cp == '9')
28		    return 0;
29		if (u >= 0x20000000)
30		    return 0;	/* overflow */
31		u <<= 3;
32		u += *cp++ - '0';	/* ascii dependent */
33	}
34	*ival = u;
35	return 1;
36}
37