Global: fixes -ffast-math compatibility

Unifies unset double handling using `-DBL_MAX` sentinel

Fixes #1894

src/common/format.c

@@ -113,8 +113,8 @@ static inline void appendInvalidPlaceholder(FFstrbuf* buffer, const char* start,
 static inline bool formatArgSet(const FFformatarg* arg)
 {
     return arg->value != NULL && (
-        (arg->type == FF_FORMAT_ARG_TYPE_DOUBLE && *(double*)arg->value > 0.0) || //Also is false for NaN
-        (arg->type == FF_FORMAT_ARG_TYPE_FLOAT && *(float*)arg->value > 0.0) || //Also is false for NaN
+        (arg->type == FF_FORMAT_ARG_TYPE_DOUBLE && *(double*)arg->value > 0.0) ||
+        (arg->type == FF_FORMAT_ARG_TYPE_FLOAT && *(float*)arg->value > 0.0) ||
         (arg->type == FF_FORMAT_ARG_TYPE_INT && *(int*)arg->value > 0) ||
         (arg->type == FF_FORMAT_ARG_TYPE_STRBUF && ((FFstrbuf*)arg->value)->length > 0) ||
         (arg->type == FF_FORMAT_ARG_TYPE_STRING && ffStrSet((char*)arg->value)) ||

src/common/percent.c

@@ -72,9 +72,9 @@ void ffPercentAppendBar(FFstrbuf* buffer, double percent, FFPercentageModuleConf
         ffStrbufAppend(buffer, &options->barBorderLeft);
     }
 
-    if (percent != percent)
+    if (percent == -DBL_MAX)
     {
-        // No color config for NaN, use total color for simplification
+        // Use total color for simplification
         if(!options->pipe && options->barColorTotal.length > 0)
             ffStrbufAppendS(buffer, "\e[" FF_COLOR_FG_LIGHT_BLACK "m");
 
@@ -187,7 +187,7 @@ void ffPercentAppendNum(FFstrbuf* buffer, double percent, FFPercentageModuleConf
         const char* colorYellow = options->percentColorYellow.chars;
         const char* colorRed = options->percentColorRed.chars;
 
-        if(percent != percent)
+        if(percent == -DBL_MAX)
             ffStrbufAppendS(buffer, "\e[" FF_COLOR_FG_LIGHT_BLACK "m");
         else if(green <= yellow)
         {

src/common/temps.c

@@ -5,7 +5,7 @@
 
 void ffTempsAppendNum(double celsius, FFstrbuf* buffer, FFColorRangeConfig config, const FFModuleArgs* module)
 {
-    if (celsius != celsius) // ignores NaN
+    if (celsius == -DBL_MAX) // ignores invalid value
         return;
 
     const FFOptionsDisplay* options = &instance.config.display;