fix(depth): avoid overflow when manually setting depth

Setting the depth to INTMAX was overflowing if strep calls was also set,
resulting in no log triggered.

clutchlog/clutchlog.h

@@ -32,6 +32,7 @@
     #define CLUTCHLOG_HAVE_UNIX_SYSINFO 1
 #else
     #define CLUTCHLOG_HAVE_UNIX_SYSINFO 0
+    // #pragma message("[clutchlog] no POSIX SYSINFO header")
 #endif
 
 //! True if the system can handle the `hfill` feature.
@@ -42,6 +43,7 @@
     #define CLUTCHLOG_HAVE_UNIX_SYSIOCTL 1
 #else
     #define CLUTCHLOG_HAVE_UNIX_SYSIOCTL 0
+    // #pragma message("[clutchlog] no POSIX SYSIOCTL header")
 #endif
 
 
@@ -52,7 +54,12 @@
     #ifndef NDEBUG
         //! Actually enable clutchlog features.
         #define WITH_CLUTCHLOG
+        // #pragma message("[clutchlog] automatically enabled")
+    // #else
+        // #pragma message("[clutchlog] automatically disabled")
     #endif
+// #else
+    // #pragma message("[clutchlog] manually enabled")
 #endif
 
 /**********************************************************************
@@ -171,6 +178,7 @@
     #define CLUTCHDUMP( LEVEL, CONTAINER, FILENAME ) do {/*nothing*/} while(0)
     #define CLUTCHFUNC( LEVEL, FUNC, ... )           do {/*nothing*/} while(0)
     #define CLUTCHCODE( LEVEL, CODE )                do {/*nothing*/} while(0)
+    // #pragma message("[clutchlog] fully disabled")
 #endif // WITH_CLUTCHLOG
 
 /**********************************************************************
@@ -999,7 +1007,9 @@ class clutchlog
 
 #if CLUTCHLOG_HAVE_UNIX_SYSINFO == 1
         //! Set the stack depth above which logs are not printed.
-        void depth(size_t d) {_depth = d;}
+        void depth(size_t d) {
+            _depth = std::min(d, std::numeric_limits<size_t>::max() - _strip_calls);
+        }
         //! Get the stack depth above which logs are not printed.
         size_t depth() const {return _depth;}
 
@@ -1333,7 +1343,10 @@ class clutchlog
             row = replace(row, "\\{level_short\\}", _level_short.at(stage));
 
 #if CLUTCHLOG_HAVE_UNIX_SYSINFO == 1
-            size_t actual_depth = depth - _strip_calls;
+            size_t actual_depth = 0;
+            if( _strip_calls < depth) {
+                actual_depth = depth - _strip_calls;
+            }
             row = replace(row, "\\{name\\}", name);
             row = replace(row, "\\{depth\\}", actual_depth);
 
@@ -1358,6 +1371,7 @@ class clutchlog
                 row = replace(row, "\\{depth_marks\\}", chevrons.str());
             }
 #endif
+
             row = replace(row, "\\{level_fmt\\}", _level_fmt.at(stage).str());
             row = replace(row, "\\{filehash_fmt\\}", fmt::hash(file, _filehash_fmts).str() );
             row = replace(row, "\\{funchash_fmt\\}", fmt::hash(func, _funchash_fmts).str() );