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Least stack-usage self-contained ftostr32np()

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This is the optimal code for a self-contained formatter, although the
original code is crafty in being smaller and simpler, and can be
evaluated as using the original output as a scratch pad for state,
making the final formatter more straightforward. While this code is
longer, all code-paths are minimal.
This commit is contained in:
Scott Lahteine 2014-12-08 01:43:44 -08:00
parent f390b3f314
commit f80a602783
1 changed files with 41 additions and 8 deletions
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49
Marlin/ultralcd.cpp
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@ -1445,16 +1445,49 @@ char *ftostr12ns(const float &x)
// convert float to space-padded string with -_23.4_ format // convert float to space-padded string with -_23.4_ format
char *ftostr32np(const float &x) { char *ftostr32np(const float &x) {
char *c = ftostr32(x); long xx = abs(x * 100);
if (c[0] == '0' || c[0] == '-') { uint8_t dig;
if (c[0] == '0') c[0] = ' ';
if (c[1] == '0') c[1] = ' '; if (x < 0) { // negative val = -_0
conv[0] = '-';
dig = (xx / 1000) % 10;
conv[1] = dig ? '0' + dig : ' ';
} }
if (c[5] == '0') { else { // positive val = __0
c[5] = ' '; dig = (xx / 10000) % 10;
if (c[4] == '0') c[4] = c[3] = ' '; if (dig) {
conv[0] = '0' + dig;
conv[1] = '0' + (xx / 1000) % 10;
}
else {
conv[0] = ' ';
dig = (xx / 1000) % 10;
conv[1] = dig ? '0' + dig : ' ';
}
} }
return c;
conv[2] = '0' + (xx / 100) % 10; // lsd always
dig = xx % 10;
if (dig) { // 2 decimal places
conv[5] = '0' + dig;
dig = (xx / 10) % 10;
conv[4] = '0' + dig;
conv[3] = '.';
}
else { // 1 or 0 decimal place
dig = (xx / 10) % 10;
if (dig) {
conv[4] = '0' + dig;
conv[3] = '.';
}
else {
conv[3] = conv[4] = ' ';
}
conv[5] = ' ';
}
conv[6] = '\0';
return conv;
} }
char *itostr31(const int &xx) char *itostr31(const int &xx)