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

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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)) {