This is papersiz.c in view mode; [Download] [Up]
/*
* This function calculates approximately (whole + num/den) * sf.
* No need for real extreme accuracy; one twenty thousandth of an
* inch should be sufficient.
*
* No `sf' parameter means to use an old one; inches are assumed
* originally.
*
* Assumptions:
*
* 0 <= num < den <= 20000
* 0 <= whole
*/
void error() ;
static long scale(whole, num, den, sf)
long whole, num, den, sf ;
{
long v ;
v = whole * sf + num * (sf / den) ;
if (v / sf != whole || v < 0 || v > 0x40000000L)
error("! arithmetic overflow in parameter") ;
sf = sf % den ;
v += (sf * num * 2 + den) / (2 * den) ;
return(v) ;
}
/*
* Convert a sequence of digits into a long; return -1 if no digits.
* Advance the passed pointer as well.
*/
static long myatol(s)
char **s ;
{
register char *p ;
register long result ;
result = 0 ;
p = *s ;
while ('0' <= *p && *p <= '9') {
if (result > 100000000)
error("! arithmetic overflow in parameter") ;
result = 10 * result + *p++ - '0' ;
}
if (p == *s) {
error("expected number! returning 10") ;
return 10 ;
} else {
*s = p ;
return(result) ;
}
}
/*
* Get a dimension, allowing all the various extensions, and
* defaults. Returns a value in scaled points.
*/
static long scalevals[] = { 1864680L, 65536L, 786432L, 186468L,
1L, 65782L, 70124L, 841489L, 4736286L } ;
static char *scalenames = "cmptpcmmspbpddccin" ;
long myatodim(s)
char **s ;
{
register long w, num, den, sc ;
register char *q ;
char *p ;
int negative = 0, i ;
p = *s ;
if (**s == '-') {
p++ ;
negative = 1 ;
}
w = myatol(&p) ;
if (w < 0) {
error("number too large; 1000 used") ;
w = 1000 ;
}
num = 0 ;
den = 1 ;
if (*p == '.') {
p++ ;
while ('0' <= *p && *p <= '9') {
if (den <= 1000) {
den *= 10 ;
num = num * 10 + *p - '0' ;
} else if (den == 10000) {
den *= 2 ;
num = num * 2 + (*p - '0') / 5 ;
}
p++ ;
}
}
while (*p == ' ')
p++ ;
for (i=0, q=scalenames; ; i++, q += 2)
if (*q == 0) {
error("expected units! assuming inches.") ;
sc = scalevals[8] ;
break ;
} else if (*p == *q && p[1] == q[1]) {
sc = scalevals[i] ;
p += 2 ;
break ;
}
w = scale(w, num, den, sc) ;
*s = p ;
return(negative?-w:w) ;
}
/*
* The routine where we handle the paper size special. We need to pass in
* the string after the `papersize=' specification.
*/
void handlepapersize(p, x, y)
char *p ;
long *x, *y ;
{
while (*p == ' ')
p++ ;
*x = myatodim(&p) ;
while (*p == ' ' || *p == ',')
p++ ;
*y = myatodim(&p) ;
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.