Provide a better ./configure script

configure

@@ -2,51 +2,89 @@
 
 OS=`uname -s`
 DEBUG=0
+PREFIX=/usr/local
 
-create_linux_config_h() {
+config_h_append_generic_endian() {
-    cat <<EOF > src/config.h
+    cat <<EOF >> "$1"
-#ifndef _CONFIG_H
+
-#define _CONFIG_H
+/*
+ * Generic compatibility
+ */
 #include <endian.h>
-#endif /* _CONFIG_H */
 EOF
 }
 
-create_darwin_config_h() {
+config_h_append_darwin_endian() {
-    cat <<EOF > src/config.h
+    cat <<EOF >> "$1"
+
+/*
+ * Darwin compatibility
+ */
+#include <libkern/OSByteOrder.h>
+
+#define htobe16(n) OSSwapHostToBigInt16(n)
+#define htole16(n) OSSwapHostToLittleInt16(n)
+#define be16toh(n) OSSwapBigToHostInt16(n)
+#define le16toh(n) OSSwapLittleToHostInt16(n)
+
+#define htobe32(n) OSSwapHostToBigInt32(n)
+#define htole32(n) OSSwapHostToLittleInt32(n)
+#define be32toh(n) OSSwapBigToHostInt32(n)
+#define le32toh(n) OSSwapLittleToHostInt32(n)
+
+#define htobe64(n) OSSwapHostToBigInt64(n)
+#define htole64(n) OSSwapHostToLittleInt64(n)
+#define be64toh(n) OSSwapBigToHostInt64(n)
+#define le64toh(n) OSSwapLittleToHostInt64(n)
+EOF
+}
+
+config_h_append_bsd_pty() {
+    cat <<EOF >> "$1"
+
+/*
+ * BSD openpty(3) compatibility
+ */
+#include <util.h>
+EOF
+}
+
+config_h_append_linux_pty() {
+    cat <<EOF >> "$1"
+
+/*
+ * Linux openpty(3) compatibility
+ */
+#include <pty.h>
+EOF
+}
+
+config_h_create() {
+    cat <<EOF > "$1"
 #ifndef _CONFIG_H
 #define _CONFIG_H
-#include <architecture/byte_order.h>
-
-#ifdef __LITTLE_ENDIAN__
-#define __DO_SWAP_BYTES
-#endif /* _DO_SWAP_BYTES */
-#endif /* _CONFIG_H */
 EOF
-}
 
-create_common_build_mk() {
+    if [ "$OS" = "Darwin" ]; then
-    if [ "$DEBUG" = 1 ]; then
+        config_h_append_darwin_endian "$1"
-        cat <<'EOF' > mk/build.mk
-CGFLAGS		= -g -fno-inline
-EOF
     else
-		cat <<'EOF' > mk/build.mk
+        config_h_append_generic_endian "$1"
-CGFLAGS		=
-EOF
     fi
 
-	cat <<'EOF' >> mk/build.mk
+    if [ "$OS" = "Linux" ]; then
-CWFLAGS		= -Wall
+        config_h_append_linux_pty "$1"
-COFLAGS		= -O2
+    else
-CFLAGS		= $(CGFLAGS) $(CWFLAGS) $(COFLAGS)
+        config_h_append_bsd_pty "$1"
+    fi
+
+    cat <<EOF >> "$1"
+
+#endif /* _CONFIG_H */
 EOF
 }
 
-create_linux_build_mk() {
+build_mk_append_generic() {
-    create_common_build_mk $@
+    cat <<'EOF' >> "$1"
-
-    cat <<'EOF' >> mk/build.mk
 LLFLAGS		= -shared -Wl,-soname=$(SONAME)
 
 STATIC		= lib$(LIBNAME).a
@@ -55,14 +93,33 @@ SONAME_SHORT	= lib$(LIBNAME).so
 SONAME		= $(SONAME_SHORT).$(VERSION_MAJOR)
 SONAME_FULL	= $(SONAME_SHORT).$(VERSION)
 
-PREFIX      = /usr/local
+EOF
+
+    cat <<EOF >> "$1"
+PREFIX		= $PREFIX
 EOF
 }
 
-create_darwin_build_mk() {
+build_mk_append_man_generic() {
-    create_common_build_mk $@
+    cat <<'EOF' >> "$1"
+MANDIR		= $(PREFIX)/share/man
+EOF
+}
 
-    cat <<'EOF' >> mk/build.mk
+build_mk_append_man_bsd() {
+    if [ "$PREFIX" = "/usr" ]; then
+        local mandir='$(PREFIX)/share/man'
+    else
+        local mandir='$(PREFIX)/man'
+    fi
+
+    cat <<EOF >> "$1"
+MANDIR		= $mandir
+EOF
+}
+
+build_mk_append_darwin() {
+    cat <<'EOF' >> "$1"
 LLFLAGS		= -dynamiclib -current_version $(VERSION)
 
 STATIC      = lib$(LIBNAME).a
@@ -71,15 +128,76 @@ SONAME_SHORT	= lib$(LIBNAME).dylib
 SONAME		= lib$(LIBNAME).$(VERSION_MAJOR).dylib
 SONAME_FULL	= lib$(LIBNAME).$(VERSION).dylib
 
-PREFIX      = /usr/local
 EOF
+
+    cat <<EOF >> "$1"
+PREFIX      = $PREFIX
+EOF
+}
+
+build_mk_create() {
+    if [ "$DEBUG" = 1 ]; then
+        cat <<'EOF' > "$1"
+CGFLAGS		= -g -fno-inline
+EOF
+    else
+        cat <<'EOF' > "$1"
+CGFLAGS		=
+EOF
+    fi
+
+    if [ "$OS" = "Darwin" ]; then
+        build_mk_append_darwin "$1"
+    else
+        build_mk_append_generic "$1"
+    fi
+
+    case $OS in
+        FreeBSD|NetBSD|OpenBSD)
+            build_mk_append_man_bsd "$1"
+        ;;
+
+        *)
+            build_mk_append_man_generic "$1"
+        ;;
+    esac
+
+    cat <<'EOF' >> "$1"
+CWFLAGS		= -Wall
+COFLAGS		= -O2
+CFLAGS		= $(CGFLAGS) $(CWFLAGS) $(COFLAGS)
+
+AR		= $(CROSS)ar
+RANLIB		= $(CROSS)ranlib
+
+RM		= /bin/rm
+LN		= /bin/ln
+RMDIR		= /bin/rmdir
+INSTALL		= /usr/bin/install
+EOF
+}
+
+parse_opt() {
+    local _IFS="$IFS"
+
+    IFS="="
+
+    set -- $1
+
+    echo $2
+
+    IFS="$_IFS"
 }
 
 for arg in $@; do
     case $arg in
-        "--enable-debug")
+        --enable-debug)
             DEBUG=1
         ;;
+
+        --prefix=*)
+            PREFIX="`parse_opt "$arg"`"
+        ;;
     esac
 done
 
@@ -87,14 +205,5 @@ if [ ! -d "mk" ]; then
     mkdir -m 0755 mk
 fi
 
-case $OS in
+config_h_create "src/config.h"
-    Linux)
+build_mk_create "mk/build.mk"
-        create_linux_config_h
-		create_linux_build_mk
-    ;;
-
-    Darwin)
-        create_darwin_config_h
-		create_darwin_build_mk
-    ;;
-esac