Updated dem libs to support z units == 1 (feet).

This is not tested since I do not have data in feet to work with.

autogen.sh

@@ -1,17 +1,65 @@
 #!/bin/sh
 
-echo "Running aclocal"
-aclocal
+OSTYPE=`uname -s`
+MACHINE=`uname -m`
+AUTO_MAKE_VERSION=`automake --version | head -1 | awk '{print $4}' | sed -e 's/\.\([0-9]*\).*/\1/'`
+if test $AUTO_MAKE_VERSION -lt 15; then
+    echo ""
+    echo "You need to upgrade to automake version 1.5 or greater."
+    echo "Most distributions have packages available to install or you can"
+    echo "find the source for the most recent version at"
+    echo "ftp://ftp.gnu.org/gnu/automake"
+    exit 1
+fi
+
+echo "Host info: $OSTYPE $MACHINE"
+echo -n " automake: `automake --version | head -1 | awk '{print $4}'`"
+echo " ($AUTO_MAKE_VERSION)"
+echo ""
+
+ACLOCAL_OPTS=""
+if [ $AUTO_MAKE_VERSION -ge 14 ]; then
+    if [ $OSTYPE = "IRIX" -o $OSTYPE = "IRIX64" ]; then    echo " -I ."
+        ACLOCAL_OPTS="-I ."
+    fi
+fi
+echo "Running aclocal $ACLOCAL_OPTS"
+aclocal $ACLOCAL_OPTS
 
 echo "Running autoheader"
 autoheader
+if [ ! -e src/Include/config.h.in ]; then
+    echo "ERROR: autoheader didn't create simgear/simgear_config.h.in!"
+    exit 1
+fi    
 
-echo "Running automake"
-automake --add-missing
+echo -n "Running automake"
+if [ $OSTYPE = "IRIX" -o $OSTYPE = "IRIX64" ]; then
+    echo " --add-missing --include-deps"
+    automake --add-missing --include-deps
+else
+    echo " --add-missing"
+    automake --add-missing
+fi
 
 echo "Running autoconf"
 autoconf
 
+if [ ! -e configure ]; then
+    echo "ERROR: configure was not created!"
+    exit 1
+fi
+
+# fixup Makefiles for Irix
+if test "$OSTYPE" = "IRIX" -o "$OSTYPE" = "IRIX64"; then
+    echo "Fixing Makefiles for Irix"
+    for n in `find . -name Makefile.in`; do \
+        mv -f $n $n.ar-new; \
+        sed 's/$(AR) cru/$(AR) -o/g' $n.ar-new > $n; \
+        rm -f $n.ar-new; \
+    done;
+fi
+
 echo ""
 echo "======================================"
 

configure.ac

@@ -184,6 +184,7 @@ AC_CHECK_LIB(plibul, ulInit,,,)
 
 AM_CONDITIONAL(HAVE_XWINDOWS, test "x$ac_cv_lib_X11_XCreateWindow" = "xyes" )
 
+AC_LANG_PUSH(C++)
 dnl Check for "plib" without which we cannot go on
 AC_CHECK_HEADER(plib/pu.h)
 if test "x$ac_cv_header_plib_pu_h" != "xyes"; then
@@ -196,6 +197,7 @@ if test "x$ac_cv_header_plib_pu_h" != "xyes"; then
     echo "configure aborted."
     exit
 fi
+AC_LANG_POP
 
 dnl Check if Generic Polygon Clipping library is installed
 dnl (from http://www.cs.man.ac.uk/aig/staff/alan/software/)

src/Lib/DEM/dem.cxx

@@ -77,7 +77,9 @@ SG_USING_STD(endl);
 #endif //0
 
 
-FGDem::FGDem( void ) {
+FGDem::FGDem( void ) :
+    z_units(2)                  // meters
+{
     // cout << "class FGDem CONstructor called." << endl;
     dem_data = new float[DEM_SIZE_1][DEM_SIZE_1];
     output_data = new float[DEM_SIZE_1][DEM_SIZE_1];
@@ -240,8 +242,8 @@ FGDem::read_a_record() {
 
     // Units code; 2 represents meters as the unit of measure for
     // elevation coordinates throughout the file.
-    inum = next_int();
-    if ( inum != 2 ) {
+    z_units = inum = next_int();
+    if ( z_units != 1 && z_units != 2 ) {
 	cout << "    Unknown (Z) units code = " << inum << "!\n";
 	exit(-1);
     }
@@ -271,6 +273,11 @@ FGDem::read_a_record() {
     // Minimum/maximum elevations in meters
     dem_z1 = next_exp();
     dem_z2 = next_exp();
+    if ( z_units == 1 ) {
+        // convert to meters
+        dem_z1 *= SG_FEET_TO_METER;
+        dem_z2 *= SG_FEET_TO_METER;
+     }
     cout << "    Elevation range " << dem_z1 << " to " << dem_z2 << "\n";
 
     // Counterclockwise angle from the primary axis of ground
@@ -314,7 +321,6 @@ void
 FGDem::read_b_record( ) {
     string token;
     int i;
-    int last;
 
     // row / column id of this profile
     prof_row = next_int();
@@ -341,9 +347,14 @@ FGDem::read_b_record( ) {
     token = next_token();
 
     // One (usually) dimensional array (1,prof_num_rows) of elevations
-    last = 0;
+    float last = 0.0;
     for ( i = 0; i < prof_num_rows; i++ ) {
-	prof_data = next_int();
+	prof_data = (float)next_int();
+
+        if ( z_units == 1 ) {
+            // convert to meters
+            prof_data *= SG_FEET_TO_METER;
+        }
 
 	// a bit of sanity checking that is unfortunately necessary
 	if ( prof_data > 10000 ) { // meters

src/Lib/DEM/dem.hxx

@@ -73,12 +73,13 @@ private:
     int prof_col, prof_row;
     int prof_num_cols, prof_num_rows;
     double prof_x1, prof_y1;
-    int prof_data;
+    float prof_data;
 
     // temporary values for the class to use
     char option_name[32];
     int do_data;
     int cur_col, cur_row;
+    int z_units;                // 1 = feet, 2 = meters
 
     // return next token from input stream
     string next_token();