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FFstrbuf: optimises ffStrbufEnsureFreeNoCheck

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This commit is contained in:
李通洲
2026-07-07 19:15:36 +08:00
parent 11d77e0d09
commit 6358bd7844
2 changed files with 33 additions and 6 deletions
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src/common/impl/FFstrbuf.c
+7 -6
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@@ -64,13 +64,14 @@ FFstrbuf ffStrbufCreateF(const char* format, ...) {
}
void ffStrbufEnsureFreeNoCheck(FFstrbuf* strbuf, uint32_t free) {
uint32_t allocate = strbuf->allocated;
if (allocate < FASTFETCH_STRBUF_DEFAULT_ALLOC) {
uint32_t allocate = strbuf->length + free;
if (allocate < FASTFETCH_STRBUF_DEFAULT_ALLOC) { // `<` for null terminator
allocate = FASTFETCH_STRBUF_DEFAULT_ALLOC;
}
while ((strbuf->length + free + 1) > allocate) { // + 1 for the null byte
allocate *= 2;
} else {
// Round up to the next power of 2.
// If the value is already a power of 2, it will be rounded up to the next power of 2.
assert(allocate < (UINT32_MAX >> 1));
allocate = 1U << (32 - __builtin_clz(allocate));
}
if (strbuf->allocated == 0) {