diff options
Diffstat (limited to 'libc/stdio-common/printf_fphex.c')
| -rw-r--r-- | libc/stdio-common/printf_fphex.c | 40 |
1 files changed, 27 insertions, 13 deletions
diff --git a/libc/stdio-common/printf_fphex.c b/libc/stdio-common/printf_fphex.c index cd8a1f972..db01d053d 100644 --- a/libc/stdio-common/printf_fphex.c +++ b/libc/stdio-common/printf_fphex.c @@ -29,6 +29,8 @@ #include <_itowa.h> #include <locale/localeinfo.h> #include <gnu/option-groups.h> +#include <stdbool.h> +#include <rounding-mode.h> /* #define NDEBUG 1*/ /* Undefine this for debugging assertions. */ #include <assert.h> @@ -356,21 +358,33 @@ __printf_fphex (FILE *fp, --numend; } + bool do_round_away = false; + + if (precision != -1 && precision < numend - numstr) + { + char last_digit = precision > 0 ? numstr[precision - 1] : leading; + char next_digit = numstr[precision]; + int last_digit_value = (last_digit >= 'A' && last_digit <= 'F' + ? last_digit - 'A' + 10 + : (last_digit >= 'a' && last_digit <= 'f' + ? last_digit - 'a' + 10 + : last_digit - '0')); + int next_digit_value = (next_digit >= 'A' && next_digit <= 'F' + ? next_digit - 'A' + 10 + : (next_digit >= 'a' && next_digit <= 'f' + ? next_digit - 'a' + 10 + : next_digit - '0')); + bool more_bits = ((next_digit_value & 7) != 0 + || precision + 1 < numend - numstr); + int rounding_mode = get_rounding_mode (); + do_round_away = round_away (negative, last_digit_value & 1, + next_digit_value >= 8, more_bits, + rounding_mode); + } + if (precision == -1) precision = numend - numstr; - else if (precision < numend - numstr - && (numstr[precision] > '8' - || (('A' < '0' || 'a' < '0') - && numstr[precision] < '0') - || (numstr[precision] == '8' - && (precision + 1 < numend - numstr - /* Round to even. */ - || (precision > 0 - && ((numstr[precision - 1] & 1) - ^ (isdigit (numstr[precision - 1]) == 0))) - || (precision == 0 - && ((leading & 1) - ^ (isdigit (leading) == 0))))))) + else if (do_round_away) { /* Round up. */ int cnt = precision; |