Fix clang-tidy bugprone-assignment-in-if-condition warnings

.clang-tidy

@@ -1,5 +1,3 @@
-Checks: '-*,
-         bugprone-*,
-         -bugprone-easily-swappable-parameters,
-         clang-analyzer-*,
-         performance-*'
+Checks: [-*,
+         bugprone-assignment-in-if-condition,
+]

src/Expr.cc

@@ -4082,13 +4082,16 @@ CallExpr::CallExpr(ExprPtr arg_func, ListExprPtr arg_args, bool in_hook, bool _i
              util::streq(((NameExpr*)func.get())->Id()->Name(), "fmt") &&
              // The following is needed because fmt might not yet
              // be bound as a name.
-             did_builtin_init && (func_val = func->Eval(nullptr)) ) {
+             did_builtin_init ) {
+            func_val = func->Eval(nullptr);
+            if ( func_val ) {
                 zeek::Func* f = func_val->AsFunc();
                 if ( f->GetKind() == Func::BUILTIN_FUNC && ! check_built_in_call((BuiltinFunc*)f, this) )
                     SetError();
             }
         }
     }
+}
 
 bool CallExpr::IsPure() const {
     if ( IsError() )

src/Var.cc

@@ -203,6 +203,7 @@ static void make_var(const IDPtr& id, TypePtr t, InitClass c, ExprPtr init, std:
     }
 
     if ( id->GetType() && id->GetType()->Tag() != TYPE_ERROR && ! id->IsBlank() ) {
+        // NOLINTNEXTLINE(bugprone-assignment-in-if-condition)
         if ( dt != VAR_REDEF && (! init || ! do_init || (! t && ! (t = init_type(init)))) ) {
             id->Error("already defined", init.get());
             return;

src/analyzer/protocol/ftp/functions.bif

@@ -160,9 +160,9 @@ function parse_ftp_pasv%(str: string%): ftp_port
 	const char* line = strchr(s, '(');
 	if ( line )
 		++line;	// move past '('
-	else if ( (line = strstr(s, "PORT")) )
+	else if ( line = strstr(s, "PORT"); line != nullptr )
 		line += 5;	// Skip over
-	else if ( (line = strchr(s, ',')) )
+	else if ( line = strchr(s, ','); line != nullptr )
 		{ // Look for comma-separated list.
 		while ( --line >= s && isdigit(*line) )
 			;	// Back up over preceding digits.

src/analyzer/protocol/http/HTTP.cc

@@ -1111,7 +1111,7 @@ const char* HTTP_Analyzer::PrefixMatch(const char* line, const char* end_of_line
 
 const char* HTTP_Analyzer::PrefixWordMatch(const char* line, const char* end_of_line, const char* prefix,
                                            bool ignore_case) {
-    if ( (line = PrefixMatch(line, end_of_line, prefix, ignore_case)) == nullptr )
+    if ( line = PrefixMatch(line, end_of_line, prefix, ignore_case); line == nullptr )
         return nullptr;
 
     const char* orig_line = line;

src/analyzer/protocol/ssl/SSL.cc

@@ -341,7 +341,7 @@ bool SSL_Analyzer::TryDecryptApplicationData(int len, const u_char* data, bool i
         decrypted.resize(decrypted_len);
 
         int res = 0;
-        if ( ! (res = EVP_DecryptFinal(ctx, NULL, &res)) ) {
+        if ( res = EVP_DecryptFinal(ctx, NULL, &res); res == 0 ) {
             DBG_LOG(DBG_ANALYZER, "Decryption failed with return code: %d. Invalid key?\n", res);
             EVP_CIPHER_CTX_free(ctx);
             return false;

src/module_util.cc

@@ -66,8 +66,8 @@ TEST_CASE("module_util normalized_module_name") {
 }
 
 string normalized_module_name(const char* module_name) {
-    int mod_len;
-    if ( (mod_len = strlen(module_name)) >= 2 && streq(module_name + mod_len - 2, "::") )
+    int mod_len = strlen(module_name);
+    if ( (mod_len >= 2) && streq(module_name + mod_len - 2, "::") != 0 )
         mod_len -= 2;
 
     return {module_name, static_cast<size_t>(mod_len)};

src/script_opt/CPP/RuntimeInitSupport.cc

@@ -211,9 +211,11 @@ IDPtr find_global__CPP(const char* g) {
 RecordTypePtr get_record_type__CPP(const char* record_type_name) {
     IDPtr existing_type;
 
-    if ( record_type_name && (existing_type = global_scope()->Find(record_type_name)) &&
-         existing_type->GetType()->Tag() == TYPE_RECORD )
+    if ( record_type_name ) {
+        IDPtr existing_type = global_scope()->Find(record_type_name);
+        if ( existing_type && existing_type->GetType()->Tag() == TYPE_RECORD )
             return cast_intrusive<RecordType>(existing_type->GetType());
+    }
 
     return make_intrusive<RecordType>(new type_decl_list());
 }

src/util.cc

@@ -93,8 +93,7 @@ std::string extract_ip(const std::string& i) {
     if ( s.size() > 1 && s.substr(0, 2) == "0x" )
         s.erase(0, 2);
 
-    size_t pos = 0;
-    if ( (pos = s.find(']')) != std::string::npos )
+    if ( size_t pos = s.find(']'); pos != std::string::npos )
         s = s.substr(0, pos);
 
     return s;
@@ -298,9 +297,9 @@ void hmac_md5(size_t size, const unsigned char* bytes, unsigned char digest[16])
 
 static bool read_random_seeds(const char* read_file, uint32_t* seed,
                               std::array<uint32_t, zeek::detail::KeyedHash::SEED_INIT_SIZE>& buf) {
-    FILE* f = nullptr;
+    FILE* f = fopen(read_file, "r");
 
-    if ( ! (f = fopen(read_file, "r")) ) {
+    if ( ! f ) {
         reporter->Warning("Could not open seed file '%s': %s", read_file, strerror(errno));
         return false;
     }
@@ -328,9 +327,9 @@ static bool read_random_seeds(const char* read_file, uint32_t* seed,
 
 static bool write_random_seeds(const char* write_file, uint32_t seed,
                                std::array<uint32_t, zeek::detail::KeyedHash::SEED_INIT_SIZE>& buf) {
-    FILE* f = nullptr;
+    FILE* f = fopen(write_file, "w+");
 
-    if ( ! (f = fopen(write_file, "w+")) ) {
+    if ( ! f ) {
         reporter->Warning("Could not create seed file '%s': %s", write_file, strerror(errno));
         return false;
     }

src/zeek-setup.cc

@@ -1018,7 +1018,7 @@ SetupResult setup(int argc, char** argv, Options* zopts) {
     }
 
     // Cooperate with nohup(1).
-    if ( (oldhandler = setsignal(SIGHUP, sig_handler)) != SIG_DFL )
+    if ( oldhandler = setsignal(SIGHUP, sig_handler); oldhandler != SIG_DFL )
         (void)setsignal(SIGHUP, oldhandler);
 
     // If we were priming the DNS cache (i.e. -P was passed as an argument), flush anything