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Workaround -Wstringop-overflow

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This commit is contained in:
Victor Zverovich 2024-08-24 07:46:44 -07:00
parent c59ee969f3
commit 0379bf3a5d
1 changed files with 14 additions and 11 deletions
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25
include/fmt/format.h
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@ -665,6 +665,7 @@ FMT_CONSTEXPR void for_each_codepoint(string_view s, F f) {
string_view(ptr, error ? 1 : to_unsigned(end - buf_ptr))); string_view(ptr, error ? 1 : to_unsigned(end - buf_ptr)));
return result ? (error ? buf_ptr + 1 : end) : nullptr; return result ? (error ? buf_ptr + 1 : end) : nullptr;
}; };
auto p = s.data(); auto p = s.data();
const size_t block_size = 4; // utf8_decode always reads blocks of 4 chars. const size_t block_size = 4; // utf8_decode always reads blocks of 4 chars.
if (s.size() >= block_size) { if (s.size() >= block_size) {
@ -673,17 +674,19 @@ FMT_CONSTEXPR void for_each_codepoint(string_view s, F f) {
if (!p) return; if (!p) return;
} }
} }
if (auto num_chars_left = s.data() + s.size() - p) { auto num_chars_left = to_unsigned(s.data() + s.size() - p);
char buf[2 * block_size - 1] = {}; if (num_chars_left == 0) return;
copy<char>(p, p + num_chars_left, buf);
const char* buf_ptr = buf; FMT_ASSERT(num_chars_left < block_size, "");
do { char buf[2 * block_size - 1] = {};
auto end = decode(buf_ptr, p); copy<char>(p, p + num_chars_left, buf);
if (!end) return; const char* buf_ptr = buf;
p += end - buf_ptr; do {
buf_ptr = end; auto end = decode(buf_ptr, p);
} while (buf_ptr - buf < num_chars_left); if (!end) return;
} p += end - buf_ptr;
buf_ptr = end;
} while (buf_ptr < buf + num_chars_left);
} }
template <typename Char> template <typename Char>