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use memchr for searching for '%' in printf format string

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rimathia 2020-11-05 15:41:38 +01:00
parent a30b279bad
commit a2de072a58
1 changed files with 11 additions and 1 deletions
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12
include/fmt/printf.h
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@ -474,8 +474,18 @@ OutputIt basic_printf_context<OutputIt, Char>::format() {
const Char* end = parse_ctx_.end(); const Char* end = parse_ctx_.end();
auto it = start; auto it = start;
while (it != end) { while (it != end) {
if (end - it < 32) {
// Use a simple linear search instead of memchr for small strings.
it = std::find(it, end, '%');
} else {
if (!detail::find<false, Char>(it, end, '%', it)) {
it = end;
}
}
if (it == end) {
continue;
}
char_type c = *it++; char_type c = *it++;
if (c != '%') continue;
if (it != end && *it == c) { if (it != end && *it == c) {
out = std::copy(start, it, out); out = std::copy(start, it, out);
start = ++it; start = ++it;