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fix(std-io): make uint128 decimal formatting safe (#2924)

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* fix(std-io): make uint128 decimal formatting safe and add all-base
numeric coverage
---------

Co-authored-by: Christoffer Lerno <christoffer@aegik.com>
This commit is contained in:
Fernando López Guevara
2026-02-11 19:50:16 -03:00
committed by GitHub
parent 7665720264
commit f079fa82b2
5 changed files with 243 additions and 34 deletions
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35
lib/std/io/formatter_private.c3
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@@ -541,7 +541,6 @@ const char[201] DIGIT_PAIRS @private =
"08182838485868788898"
"09192939495969798999";
fn usz? Formatter.ntoa(&self, uint128 value, bool negative, uint base) @private
{
char[PRINTF_NTOA_BUFFER_SIZE] buf @noinit;
@@ -574,10 +573,10 @@ fn usz? Formatter.ntoa(&self, uint128 value, bool negative, uint base) @private
while (value >= 10)
{
if (len + 1 >= PRINTF_NTOA_BUFFER_SIZE) return INTERNAL_BUFFER_EXCEEDED~;
char digit = (char)(value % 100);
char digit = (char)(value % 100U);
buf[len:2] = DIGIT_PAIRS[2 * digit:2];
len += 2;
value /= 100;
value /= 100U;
}
if (value > 0)
{
@@ -593,16 +592,16 @@ fn usz? Formatter.ntoa(&self, uint128 value, bool negative, uint base) @private
value >>= 4;
}
while (value);
case 8:
do
{
if (len >= PRINTF_NTOA_BUFFER_SIZE) return INTERNAL_BUFFER_EXCEEDED~;
buf[len++] = '0' + (char)value & 0x7;
value >>= 3;
}
while (value);
default:
unreachable();
case 8:
do
{
if (len >= PRINTF_NTOA_BUFFER_SIZE) return INTERNAL_BUFFER_EXCEEDED~;
buf[len++] = '0' + (char)value & 0x7;
value >>= 3;
}
while (value);
default:
unreachable();
}
}
return self.ntoa_format((String)buf[:PRINTF_NTOA_BUFFER_SIZE], len, negative, base);
@@ -684,9 +683,9 @@ fn usz? Formatter.out_char(&self, any arg) @private
usz len = 1;
// pre padding
if (!self.flags.left)
{
len += self.pad(' ', self.width, len)!;
}
{
len += self.pad(' ', self.width, len)!;
}
// char output
Char32 c = types::any_to_int(arg, uint) ?? 0xFFFD;
@@ -708,8 +707,8 @@ fn usz? Formatter.out_char(&self, any arg) @private
self.out((char)(0x80 | (c & 0x3F)))!;
}
if (self.flags.left)
{
len += self.pad(' ', self.width, len)!;
{
len += self.pad(' ', self.width, len)!;
}
return len;
}