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py/formatfloat.c: Fix format of floating point numbers near 1.0. 

In particular, numbers which are less than 1.0 but which
round up to 1.0.

This also makes those numbers which round up to 1.0 to
print with e+00 rather than e-00 for those formats which
print exponents.

Addresses issue #1178.
This commit is contained in:
Dave Hylands 2015-04-12 00:36:00 -07:00 committed by Damien George
parent 8b7faa31e1
commit b21786947f
1 changed files with 8 additions and 2 deletions
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10
py/formatfloat.c
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@ -142,8 +142,14 @@ int mp_format_float(float f, char *buf, size_t buf_size, char fmt, int prec, cha
num.f *= *pos_pow;
}
}
char first_dig = '0';
char e_sign_char = '-';
if (num.f < 1.0F && num.f >= 0.9999995F) {
num.f = 1.0F;
first_dig = '1';
if (e == 0) {
e_sign_char = '+';
}
} else {
e++;
num.f *= 10.0F;
@ -155,7 +161,7 @@ int mp_format_float(float f, char *buf, size_t buf_size, char fmt, int prec, cha
if (fmt == 'f' || (fmt == 'g' && e <= 4)) {
fmt = 'f';
dec = -1;
*s++ = '0';
*s++ = first_dig;
if (prec + e + 1 > buf_remaining) {
prec = buf_remaining - e - 1;
@ -175,7 +181,7 @@ int mp_format_float(float f, char *buf, size_t buf_size, char fmt, int prec, cha
} else {
// For e & g formats, we'll be printing the exponent, so set the
// sign.
e_sign = '-';
e_sign = e_sign_char;
dec = 0;
if (prec > (buf_remaining - 6)) {