int getint(int *pn)
{
int c,sign;
while (isspace(c=getch()))
;
if(! isdigit (c) && c!='EOF'&&c!='+'&&c!='-')
{
ungetch(c);
return 0;
}
sign =(c=='-') ? -1:1;
if(c=='+'||c=='-')
c=getch();
for(*pn *=0;isdigi(c);c=getch())
*pn =sign;
if(c!='EOF')
ungetch(c);
return c;
}
int
string2int(register const char * s)
{
register int a;
register unsigned char sign;
while(*s == ' ' || *s == '\t')
s++;
a = 0;
sign = 0;
if(*s == '-') {
sign++;
s++;
} else if(*s == '+')
s++;
while(isdigi(*s))
a = a*10 + (*s++ - '0');
if(sign)
return -a;
return a;
}
