Address clang-tidy 18 warnings (#2428)

.clang-tidy

@@ -61,6 +61,7 @@ Checks: '
     -performance-no-int-to-ptr,
     portability-*,
     readability-*,
+    -readability-avoid-nested-conditional-operator,
     -readability-braces-around-statements,
     -readability-else-after-return,
     -readability-function-cognitive-complexity,

src/curl.cpp

@@ -609,7 +609,7 @@ size_t S3fsCurl::ReadCallback(void* ptr, size_t size, size_t nmemb, void* userp)
     memcpy(ptr, pCurl->postdata, copysize);
 
     pCurl->postdata_remaining = (pCurl->postdata_remaining > static_cast<off_t>(copysize) ? (pCurl->postdata_remaining - copysize) : 0);
-    pCurl->postdata          += static_cast<size_t>(copysize);
+    pCurl->postdata          += copysize;
 
     return copysize;
 }
@@ -963,7 +963,7 @@ bool S3fsCurl::GetSseKey(std::string& md5, std::string& ssekey)
 
 bool S3fsCurl::GetSseKeyMd5(size_t pos, std::string& md5)
 {
-    if(S3fsCurl::sseckeys.size() <= static_cast<size_t>(pos)){
+    if(S3fsCurl::sseckeys.size() <= pos){
         return false;
     }
     size_t cnt = 0;
@@ -1526,7 +1526,7 @@ int S3fsCurl::ParallelMixMultipartUploadRequest(const char* tpath, headers_t& me
             for(off_t i = 0, bytes = 0; i < iter->bytes; i += bytes){
                 std::unique_ptr<S3fsCurl> s3fscurl_para(new S3fsCurl(true));
 
-                bytes = std::min(static_cast<off_t>(GetMultipartCopySize()), iter->bytes - i);
+                bytes = std::min(GetMultipartCopySize(), iter->bytes - i);
                 /* every part should be larger than MIN_MULTIPART_SIZE and smaller than FIVE_GB */
                 off_t remain_bytes = iter->bytes - i - bytes;
 
@@ -3447,7 +3447,7 @@ int S3fsCurl::PutRequest(const char* tpath, headers_t& meta, int fd)
         std::string strMD5;
         if(-1 != fd){
             strMD5 = s3fs_get_content_md5(fd);
-            if(0 == strMD5.length()){
+            if(strMD5.empty()){
                 S3FS_PRN_ERR("Failed to make MD5.");
                 return -EIO;
             }

src/fdcache_entity.cpp

@@ -1180,10 +1180,10 @@ int FdEntity::NoCacheLoadAndPost(PseudoFdInfo* pseudo_obj, off_t start, off_t si
             break;
         }
         // download each multipart size(default 10MB) in unit
-        for(off_t oneread = 0, totalread = (iter->offset < start ? start : 0); totalread < static_cast<off_t>(iter->bytes); totalread += oneread){
+        for(off_t oneread = 0, totalread = (iter->offset < start ? start : 0); totalread < iter->bytes; totalread += oneread){
             int   upload_fd = physical_fd;
             off_t offset    = iter->offset + totalread;
-            oneread         = std::min(static_cast<off_t>(iter->bytes) - totalread, S3fsCurl::GetMultipartSize());
+            oneread         = std::min(iter->bytes - totalread, S3fsCurl::GetMultipartSize());
 
             // check rest size is over minimum part size
             //

src/s3fs.cpp

@@ -60,7 +60,7 @@
 #define ENOATTR                   ENODATA
 #endif
 
-enum class dirtype {
+enum class dirtype : int8_t {
     UNKNOWN = -1,
     NEW = 0,
     OLD = 1,
@@ -4040,7 +4040,7 @@ static int s3fs_getxattr(const char* path, const char* name, char* value, size_t
     const char* pvalue = xiter->second.c_str();
 
     if(0 < size){
-        if(static_cast<size_t>(size) < length){
+        if(size < length){
             // over buffer size
             return -ERANGE;
         }
@@ -4296,12 +4296,12 @@ static void* s3fs_init(struct fuse_conn_info* conn)
 
     // Investigate system capabilities
     #ifndef __APPLE__
-    if((unsigned int)conn->capable & FUSE_CAP_ATOMIC_O_TRUNC){
+    if(conn->capable & FUSE_CAP_ATOMIC_O_TRUNC){
          conn->want |= FUSE_CAP_ATOMIC_O_TRUNC;
     }
     #endif
 
-    if((unsigned int)conn->capable & FUSE_CAP_BIG_WRITES){
+    if(conn->capable & FUSE_CAP_BIG_WRITES){
          conn->want |= FUSE_CAP_BIG_WRITES;
     }
 
@@ -4725,7 +4725,7 @@ static fsblkcnt_t parse_bucket_size(char* max_size)
         if(!isdigit(*ptr)){
             return 0;   // wrong number
         }
-        n_bytes = static_cast<unsigned long long>(strtoull(max_size, nullptr, 10));
+        n_bytes = strtoull(max_size, nullptr, 10);
         if((INT64_MAX / scale) < n_bytes){
             return 0;   // overflow
         }
@@ -5199,7 +5199,7 @@ static int my_fuse_opt_proc(void* data, const char* arg, int key, struct fuse_ar
             return 0;
         }
         else if(is_prefix(arg, "multipart_size=")){
-            off_t size = static_cast<off_t>(cvt_strtoofft(strchr(arg, '=') + sizeof(char), /*base=*/ 10));
+            off_t size = cvt_strtoofft(strchr(arg, '=') + sizeof(char), /*base=*/ 10);
             if(!S3fsCurl::SetMultipartSize(size)){
                 S3FS_PRN_EXIT("multipart_size option must be at least 5 MB.");
                 return -1;
@@ -5207,7 +5207,7 @@ static int my_fuse_opt_proc(void* data, const char* arg, int key, struct fuse_ar
             return 0;
         }
         else if(is_prefix(arg, "multipart_copy_size=")){
-            off_t size = static_cast<off_t>(cvt_strtoofft(strchr(arg, '=') + sizeof(char), /*base=*/ 10));
+            off_t size = cvt_strtoofft(strchr(arg, '=') + sizeof(char), /*base=*/ 10);
             if(!S3fsCurl::SetMultipartCopySize(size)){
                 S3FS_PRN_EXIT("multipart_copy_size option must be at least 5 MB.");
                 return -1;
@@ -5215,7 +5215,7 @@ static int my_fuse_opt_proc(void* data, const char* arg, int key, struct fuse_ar
             return 0;
         }
         else if(is_prefix(arg, "max_dirty_data=")){
-            off_t size = static_cast<off_t>(cvt_strtoofft(strchr(arg, '=') + sizeof(char), /*base=*/ 10));
+            off_t size = cvt_strtoofft(strchr(arg, '=') + sizeof(char), /*base=*/ 10);
             if(size >= 50){
                 size *= 1024 * 1024;
             }else if(size != -1){

src/s3objlist.cpp

@@ -197,7 +197,7 @@ bool S3ObjList::GetLastName(std::string& lastname) const
     bool result = false;
     lastname = "";
     for(s3obj_t::const_iterator iter = objects.begin(); iter != objects.end(); ++iter){
-        if((*iter).second.orgname.length()){
+        if(!iter->second.orgname.empty()){
             if(lastname.compare(iter->second.orgname) < 0){
                 lastname = (*iter).second.orgname;
                 result = true;