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Fix -W parameter parsing

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This commit is contained in:
Rangi42
2025-07-19 15:43:54 -04:00
parent 14f5e16ae8
commit 250e08043b
5 changed files with 32 additions and 32 deletions
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32
src/diagnostics.cpp
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@@ -18,7 +18,7 @@ void WarningState::update(WarningState other) {
}
}
std::pair<WarningState, std::optional<uint8_t>> getInitialWarningState(std::string &flag) {
std::pair<WarningState, std::optional<uint32_t>> getInitialWarningState(std::string &flag) {
// Check for prefixes that affect what the flag does
WarningState state;
if (flag.starts_with("error=")) {
@@ -51,28 +51,22 @@ std::pair<WarningState, std::optional<uint8_t>> getInitialWarningState(std::stri
// Is the rest of the string a decimal number?
// We want to avoid `strtoul`'s whitespace and sign, so we parse manually
char const *ptr = flag.c_str() + equals + 1;
uint8_t param = 0;
bool warned = false;
uint32_t param = 0;
bool overflowed = false;
// The `if`'s condition above ensures that this will run at least once
do {
// If we don't have a digit, bail
if (*ptr < '0' || *ptr > '9') {
break;
}
// Avoid overflowing!
if (param > UINT8_MAX - (*ptr - '0')) {
if (!warned) {
warnx("Invalid warning flag \"%s\": capping parameter at 255", flag.c_str());
}
warned = true; // Only warn once, cap always
param = 255;
for (; *ptr >= '0' && *ptr <= '9'; ++ptr) {
if (overflowed) {
continue;
}
param = param * 10 + (*ptr - '0');
++ptr;
} while (*ptr);
uint32_t c = *ptr - '0';
if (param > (UINT32_MAX - c) / 10) {
overflowed = true;
param = UINT32_MAX;
continue;
}
param = param * 10 + c;
}
// If we reached the end of the string, truncate it at the '='
if (*ptr == '\0') {