179 lines
3.2 KiB
C
179 lines
3.2 KiB
C
/*
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* fltpr.c - print floating point numbers
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*/
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/* $Header$ */
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#ifndef NOFLOAT
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#include <string.h>
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#include <stdarg.h>
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#include "loc_incl.h"
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static char *
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_pfloat(long double r, register char *s, int n, int flags)
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{
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register char *s1;
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int sign, dp;
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register int i;
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s1 = _fcvt(r, n, &dp, &sign);
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if (sign)
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*s++ = '-';
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else if (flags & FL_SIGN)
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*s++ = '+';
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else if (flags & FL_SPACE)
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*s++ = ' ';
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if (dp<=0)
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*s++ = '0';
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for (i=dp; i>0; i--)
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if (*s1) *s++ = *s1++;
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else *s++ = '0';
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if (((i=n) > 0) || (flags & FL_ALT))
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*s++ = '.';
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while (++dp <= 0) {
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if (--i<0)
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break;
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*s++ = '0';
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}
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while (--i >= 0)
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if (*s1) *s++ = *s1++;
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else *s++ = '0';
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return s;
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}
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static char *
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_pscien(long double r, register char *s, int n, int flags)
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{
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int sign, dp;
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register char *s1;
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s1 = _ecvt(r, n + 1, &dp, &sign);
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if (sign)
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*s++ = '-';
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else if (flags & FL_SIGN)
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*s++ = '+';
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else if (flags & FL_SPACE)
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*s++ = ' ';
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*s++ = *s1++;
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if ((n > 0) || (flags & FL_ALT))
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*s++ = '.';
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while (--n >= 0)
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if (*s1) *s++ = *s1++;
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else *s++ = '0';
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*s++ = 'e';
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if ( r != 0 ) --dp ;
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if ( dp<0 ) {
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*s++ = '-' ; dp= -dp ;
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} else {
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*s++ = '+' ;
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}
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if (dp >= 100) {
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*s++ = '0' + (dp / 100);
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dp %= 100;
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}
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*s++ = '0' + (dp/10);
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*s++ = '0' + (dp%10);
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return s;
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}
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#define NDIGINEXP(exp) (((exp) >= 100 || (exp) <= -100) ? 3 : 2)
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#define LOW_EXP -4
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#define USE_EXP(exp, ndigits) (((exp) < LOW_EXP + 1) || (exp >= ndigits + 1))
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static char *
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_gcvt(long double value, int ndigit, char *s, int flags)
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{
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int sign, dp;
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register char *s1, *s2;
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register int i;
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register int nndigit = ndigit;
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s1 = _ecvt(value, ndigit, &dp, &sign);
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s2 = s;
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if (sign) *s2++ = '-';
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else if (flags & FL_SIGN)
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*s2++ = '+';
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else if (flags & FL_SPACE)
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*s2++ = ' ';
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if (!(flags & FL_ALT))
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for (i = nndigit - 1; i > 0 && s1[i] == '0'; i--)
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nndigit--;
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if (USE_EXP(dp,ndigit)) {
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/* Use E format */
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dp--;
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*s2++ = *s1++;
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if ((nndigit > 1) || (flags & FL_ALT)) *s2++ = '.';
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while (--nndigit > 0) *s2++ = *s1++;
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*s2++ = 'e';
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if (dp < 0) {
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*s2++ = '-';
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dp = -dp;
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}
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else *s2++ = '+';
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s2 += NDIGINEXP(dp);
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*s2 = 0;
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for (i = NDIGINEXP(dp); i > 0; i--) {
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*--s2 = dp % 10 + '0';
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dp /= 10;
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}
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return s;
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}
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/* Use f format */
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if (dp <= 0) {
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if (*s1 != '0') {
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/* otherwise the whole number is 0 */
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*s2++ = '0';
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*s2++ = '.';
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}
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while (dp < 0) {
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dp++;
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*s2++ = '0';
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}
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}
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for (i = 1; i <= nndigit; i++) {
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*s2++ = *s1++;
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if (i == dp) *s2++ = '.';
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}
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if (i <= dp) {
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while (i++ <= dp) *s2++ = '0';
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*s2++ = '.';
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}
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if ((s2[-1]=='.') && !(flags & FL_ALT)) s2--;
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*s2 = '\0';
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return s;
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}
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char *
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_f_print(va_list *ap, int flags, char *s, char c, int precision)
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{
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register char *old_s = s;
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long double ld_val;
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if (flags & FL_LONGDOUBLE) ld_val = va_arg(*ap, long double);
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else ld_val = (long double) va_arg(*ap, double);
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switch(c) {
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case 'f':
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s = _pfloat(ld_val, s, precision, flags);
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break;
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case 'e':
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case 'E':
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s = _pscien(ld_val, s, precision , flags);
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break;
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case 'g':
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case 'G':
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s = _gcvt(ld_val, precision, s, flags);
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s += strlen(s);
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break;
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}
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if ( c == 'E' || c == 'G') {
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while (*old_s && *old_s != 'e') old_s++;
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if (*old_s == 'e') *old_s = 'E';
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}
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return s;
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}
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#endif /* NOFLOAT */
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