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fix: [imp] fmt buffer failsafe

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mutouyun 2022-12-04 19:14:59 +08:00
parent 46a6228c34
commit ff39712e62
1 changed files with 3 additions and 0 deletions
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3
src/libimp/fmt.cpp
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@ -113,6 +113,9 @@ template <typename A /*a fundamental or pointer type*/>
int sprintf(fmt_context &ctx, span<char const> const &sfmt, A a) { int sprintf(fmt_context &ctx, span<char const> const &sfmt, A a) {
for (int sz = -1;;) { for (int sz = -1;;) {
auto sbuf = ctx.buffer(sz + 1); auto sbuf = ctx.buffer(sz + 1);
if (sbuf.size() < (sz + 1)) {
return -1;
}
sz = std::snprintf(sbuf.data(), sbuf.size(), sfmt.data(), a); sz = std::snprintf(sbuf.data(), sbuf.size(), sfmt.data(), a);
if (sz <= 0) { if (sz <= 0) {
return sz; return sz;