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tree-wide: Replace exp10() with our own impl

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exp10() has a symbol version > 2.34 on latest glibc. To allow 
dropping our baseline required glibc runtime version to <= 2.34, 
let's add our own version to prevent pulling in the newer symbol 
from glibc.
This commit is contained in:
Daan De Meyer
2026-05-20 11:03:27 +02:00
committed by Daan De Meyer
parent 27e0bba966
commit d52c8f2068
7 changed files with 75 additions and 8 deletions
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src/libsystemd/sd-json/sd-json.c
+5 -1
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@@ -2801,7 +2801,11 @@ static int json_parse_number(const char **p, JsonValue *ret) {
*p = c;
if (is_real) {
ret->real = ((negative ? -1.0 : 1.0) * (x + (y / shift))) * exp10((exponent_negative ? -1.0 : 1.0) * exponent);
/* Clamp before casting to int — a JSON input with an absurdly large exponent could
* otherwise trigger undefined behaviour in the double→int conversion. xexp10i()
* itself saturates anything beyond ~10^308, so clamping at INT_MAX is harmless. */
int e = exponent > (double) INT_MAX ? INT_MAX : (int) exponent;
ret->real = ((negative ? -1.0 : 1.0) * (x + (y / shift))) * xexp10i(exponent_negative ? -e : e);
return JSON_TOKEN_REAL;
} else if (negative) {
ret->integer = i;