Losslessly write double precision parameters.

rchristie · rchristie · commit 3c5d96ea9649 · 2015-02-24T16:22:28.000+13:00
Increase precision of double precision output to 17 significant figures (format %.17g) so lossless by default. https://tracker.physiomeproject.org/show_bug.cgi?id=3837
diff --git a/io/src/OutputStream.cpp b/io/src/OutputStream.cpp
@@ -174,7 +174,7 @@ FmlIoErrorNumber FileOutputStream::writeDouble( double value )
         return FML_IOERR_RESOURCE_CLOSED;
     }
 
-    int err = fprintf( file, "%.8g ", value );
+    int err = fprintf( file, "%.17g ", value );
 
     if( err < 0 )
     {
@@ -268,8 +268,9 @@ FmlIoErrorNumber StringOutputStream::writeDouble( double value )
     {
         return FML_IOERR_RESOURCE_CLOSED;
     }
-
-    buffer << value << " ";
+    char tmpValueString[50];
+    sprintf(tmpValueString, "%.17g ", value);
+    buffer << tmpValueString;
     
     return FML_IOERR_NO_ERROR;
 }

Original file line number	Diff line number	Diff line change
`@@ -174,7 +174,7 @@ FmlIoErrorNumber FileOutputStream::writeDouble( double value )`
`174`	`174`	`return FML_IOERR_RESOURCE_CLOSED;`
`175`	`175`	`}`
`176`	`176`
`177`		`- int err = fprintf( file, "%.8g ", value );`
	`177`	`+ int err = fprintf( file, "%.17g ", value );`
`178`	`178`
`179`	`179`	`if( err < 0 )`
`180`	`180`	`{`
`@@ -268,8 +268,9 @@ FmlIoErrorNumber StringOutputStream::writeDouble( double value )`
`268`	`268`	`{`
`269`	`269`	`return FML_IOERR_RESOURCE_CLOSED;`
`270`	`270`	`}`
`271`		`-`
`272`		`- buffer << value << " ";`
	`271`	`+ char tmpValueString[50];`
	`272`	`+ sprintf(tmpValueString, "%.17g ", value);`
	`273`	`+ buffer << tmpValueString;`
`273`	`274`
`274`	`275`	`return FML_IOERR_NO_ERROR;`
`275`	`276`	`}`