Ultrix-3.1/src/libPW/patoi.c

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/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

static char Sccsid[]="@(#)patoi.c 3.0 4/22/86";
/*
	Function to convert ascii string to integer.  Converts
	positive numbers only.  Returns -1 if non-numeric
	character encountered.
*/

patoi(s)
register char *s;
{
	register int i;

	i = 0;
	while(*s >= '0' && *s <= '9') i = 10 * i + *s++ - '0';

	if(*s) return(-1);
	return(i);
}