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| author | Emanuel Sprung <emanuel.sprung@gmail.com> | 2020-04-06 23:27:15 +0200 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2020-04-07 09:02:02 +0200 |
| commit | 154dcd1ed61243a7e8b0b54a75c27034298e4d1d (patch) | |
| tree | 03d97008ea97481bd9010980741d39f9a7e9dea7 /AK | |
| parent | 22f20cd51daebbeedf98b39ca2e5649051b0a016 (diff) | |
| download | serenity-154dcd1ed61243a7e8b0b54a75c27034298e4d1d.zip | |
AK: Allow %m.nf specifier for double/float in printf to set fraction with
This patch adds the missing part for the printf of double values to specify
the length of the fraction part. For GVariant, a default of %.2 is used.
Diffstat (limited to 'AK')
| -rw-r--r-- | AK/PrintfImplementation.h | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/AK/PrintfImplementation.h b/AK/PrintfImplementation.h index cab0e735b5..b46fff6c1a 100644 --- a/AK/PrintfImplementation.h +++ b/AK/PrintfImplementation.h @@ -178,7 +178,7 @@ template<typename PutChFunc> } template<typename PutChFunc> -[[gnu::always_inline]] inline int print_double(PutChFunc putch, char*& bufptr, double number, bool leftPad, bool zeroPad, u32 fieldWidth) +[[gnu::always_inline]] inline int print_double(PutChFunc putch, char*& bufptr, double number, bool leftPad, bool zeroPad, u32 fieldWidth, u32 fraction_length = 6) { int length = 0; @@ -192,9 +192,11 @@ template<typename PutChFunc> putch(bufptr, '.'); length++; double fraction = number - (i64)number; - // FIXME: Allow other fractions - fraction = fraction * 1000000; - return length + print_u64(putch, bufptr, (i64)fraction, leftPad, true, 6); + + for (u32 i = 0; i < fraction_length; ++i) + fraction = fraction * 10; + + return length + print_u64(putch, bufptr, (i64)fraction, false, true, fraction_length); } template<typename PutChFunc> @@ -295,6 +297,7 @@ template<typename PutChFunc> bool zeroPad = false; bool dot = false; unsigned fieldWidth = 0; + unsigned fraction_length = 0; unsigned long_qualifiers = 0; bool size_qualifier = false; (void)size_qualifier; @@ -324,10 +327,17 @@ template<typename PutChFunc> goto one_more; } if (*p >= '0' && *p <= '9') { - fieldWidth *= 10; - fieldWidth += *p - '0'; - if (*(p + 1)) - goto one_more; + if (!dot) { + fieldWidth *= 10; + fieldWidth += *p - '0'; + if (*(p + 1)) + goto one_more; + } else { + fraction_length *= 10; + fraction_length += *p - '0'; + if (*(p + 1)) + goto one_more; + } } if (*p == '*') { fieldWidth = va_arg(ap, int); @@ -381,7 +391,7 @@ template<typename PutChFunc> #if !defined(BOOTSTRAPPER) && !defined(KERNEL) case 'g': case 'f': - ret += print_double(putch, bufptr, va_arg(ap, double), left_pad, zeroPad, fieldWidth); + ret += print_double(putch, bufptr, va_arg(ap, double), left_pad, zeroPad, fieldWidth, fraction_length); break; #endif |