core: move floating point functions to own header file

This were in subsurface-string.h for unknown reasons.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

core/CMakeLists.txt

@@ -165,6 +165,7 @@ set(SUBSURFACE_CORE_LIB_SRCS
 	string-format.h
 	string-format.cpp
 	strtod.c
+	subsurface-float.h
 	subsurface-string.h
 	subsurfacestartup.c
 	subsurfacestartup.h

core/libdivecomputer.c

@@ -15,6 +15,7 @@
 #include "gettext.h"
 #include "divesite.h"
 #include "sample.h"
+#include "subsurface-float.h"
 #include "subsurface-string.h"
 #include "device.h"
 #include "dive.h"

core/parse-xml.c

@@ -24,8 +24,9 @@
 #include "dive.h"
 #include "divesite.h"
 #include "errorhelper.h"
-#include "subsurface-string.h"
 #include "parse.h"
+#include "subsurface-float.h"
+#include "subsurface-string.h"
 #include "subsurface-time.h"
 #include "trip.h"
 #include "device.h"

core/settings/qPrefDisplay.cpp

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
-#include "core/subsurface-string.h"
 #include "qPrefDisplay.h"
 #include "qPrefPrivate.h"
+#include "core/subsurface-float.h"
 
 #include <QApplication>
 #include <QFont>

core/settings/qPrefPrivate.cpp

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "qPrefPrivate.h"
-#include "core/subsurface-string.h"
+#include "core/subsurface-float.h"
 
 #include <QSettings>
 

core/subsurface-float.h

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef SUBSURFACE_FLOAT_H
+#define SUBSURFACE_FLOAT_H
+
+#include <math.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline bool nearly_equal(double a, double b)
+{
+	return fabs(a - b) <= 1e-6 * fmax(fabs(a), fabs(b));
+}
+
+static inline bool nearly_0(double fp)
+{
+	return fabs(fp) <= 1e-6;
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif // SUBSURFACE_FLOAT_H

core/subsurface-string.h

@@ -5,7 +5,6 @@
 #include <stdbool.h>
 #include <string.h>
 #include <time.h>
-#include <math.h>
 
 // shared generic definitions and macros
 // mostly about strings, but a couple of math macros are here as well
@@ -27,16 +26,6 @@
 extern "C" {
 #endif
 
-static inline bool nearly_equal(double a, double b)
-{
-	return fabs(a - b) <= 1e-6 * fmax(fabs(a), fabs(b));
-}
-
-static inline bool nearly_0(double fp)
-{
-	return fabs(fp) <= 1e-6;
-}
-
 // string handling
 
 static inline bool same_string(const char *a, const char *b)