femtolisp/llt/cplxprint.c

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2008-06-30 21:53:51 -04:00
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "ieee754.h"
#include "dtypes.h"
#include "utils.h"
void snprint_cplx(char *s, size_t cnt, double re, double im,
// args to pass on to snprint_real
int width, int dec,
int max_digs_rt, int max_digs_lf,
// print spaces around sign in a+bi
int spflag)
{
int fzr = (re==0) || rel_zero(re,im);
int fzi = (im==0) || rel_zero(im,re);
size_t len, sl;
size_t space = cnt;
s[0] = '\0';
if (isnan(im) && fzr) {
if (space < 2) return;
snprint_real(s, space-2, im, width, dec, max_digs_rt, max_digs_lf);
strcat(s, "i");
return;
}
if (!fzr || (fzr && fzi)) {
if (space < 4) return;
snprint_real(s, space-4, re, width, dec, max_digs_rt, max_digs_lf);
if ((im >= 0 || (isnan(im)&&!sign_bit(im))) && !fzi) {
if (spflag) {
strcat(s, " + ");
}
else {
strcat(s, "+");
}
}
else if (!fzi) {
im = -im;
if (spflag)
strcat(s, " - ");
else
strcat(s, "-");
}
}
if (!fzi) {
len = sl = strlen(s);
if (im == -1) {
while ((long)(len-sl) < (long)(width-2) && len < (space-3))
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s[len++] = ' ';
s[len] = '-';
s[len+1] = 'i';
s[len+2] = '\0';
}
else if (im == 1) {
while ((long)(len-sl) < (long)(width-1) && len < (space-2))
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s[len++] = ' ';
s[len] = 'i';
s[len+1] = '\0';
}
else {
snprint_real(s+len, space-len-2, im, width, dec,
max_digs_rt, max_digs_lf);
strcat(s, "i");
}
}
}