6973bf5482
* libF77/configure.in: Define IEEE_COMPLEX_DIVIDE. * libF77/[cz]_div.c: Arrange for compilation under -DIEEE_COMPLEX_DIVIDE to make these routines avoid calling sig_die when the denominator vanishes. * libF77/s_rnge.c: Add casts for the case of sizeof(ftnint) == sizeof(int) < sizeof(long). * libI77/endfile.c: Set state to writing (b->uwrt = 1) when an endfile statement requires copying the file Also, supply a missing (long) cast in the sprintf call. * libI77/sfe.c: Add #ifdef ALWAYS_FLUSH logic, for formatted I/O. From-SVN: r32496
45 lines
840 B
C
45 lines
840 B
C
#include "f2c.h"
|
|
|
|
#ifdef KR_headers
|
|
extern VOID sig_die();
|
|
VOID z_div(c, a, b) doublecomplex *a, *b, *c;
|
|
#else
|
|
extern void sig_die(char*, int);
|
|
void z_div(doublecomplex *c, doublecomplex *a, doublecomplex *b)
|
|
#endif
|
|
{
|
|
double ratio, den;
|
|
double abr, abi, cr;
|
|
|
|
if( (abr = b->r) < 0.)
|
|
abr = - abr;
|
|
if( (abi = b->i) < 0.)
|
|
abi = - abi;
|
|
if( abr <= abi )
|
|
{
|
|
if(abi == 0) {
|
|
#ifdef IEEE_COMPLEX_DIVIDE
|
|
if (a->i != 0 || a->r != 0)
|
|
abi = 1.;
|
|
c->i = c->r = abi / abr;
|
|
return;
|
|
#else
|
|
sig_die("complex division by zero", 1);
|
|
#endif
|
|
}
|
|
ratio = b->r / b->i ;
|
|
den = b->i * (1 + ratio*ratio);
|
|
cr = (a->r*ratio + a->i) / den;
|
|
c->i = (a->i*ratio - a->r) / den;
|
|
}
|
|
|
|
else
|
|
{
|
|
ratio = b->i / b->r ;
|
|
den = b->r * (1 + ratio*ratio);
|
|
cr = (a->r + a->i*ratio) / den;
|
|
c->i = (a->i - a->r*ratio) / den;
|
|
}
|
|
c->r = cr;
|
|
}
|