Damn Xan, you code like a BEAST O:)

Makefile

@@ -0,0 +1,5 @@
+all:
+	$(MAKE) -C src all
+
+clean:
+	$(MAKE) -C src clean

configure

@@ -0,0 +1,95 @@
+#! /bin/sh
+
+OS=`uname -s`
+PREFIX=/usr/local
+DEBUG=0
+
+create_linux_config_h() {
+    cat <<EOF > src/config.h
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include <endian.h>
+#define PATTY_INSTALL_PREFIX "$PREFIX"
+#endif /* _CONFIG_H */
+EOF
+}
+
+create_darwin_config_h() {
+    cat <<EOF > src/config.h
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include <architecture/byte_order.h>
+
+#ifdef __LITTLE_ENDIAN__
+#define __DO_SWAP_BYTES
+#endif /* _DO_SWAP_BYTES */
+#define PATTY_INSTALL_PREFIX "$PREFIX"
+#endif /* _CONFIG_H */
+EOF
+}
+
+create_common_build_mk() {
+    if [ "$DEBUG" = 1 ]; then
+        cat <<EOF > mk/build.mk
+PREFIX		= $PREFIX
+
+CGFLAGS		= -g -fno-inline
+EOF
+	else
+		cat <<EOF > mk/build.mk
+PREFIX		= $PREFIX
+
+CGFLAGS		=
+EOF
+    fi
+}
+
+create_linux_build_mk() {
+    create_common_build_mk $@
+
+    cat <<'EOF' >> mk/build.mk
+LLFLAGS		= -shared -Wl,-soname=$(SONAME)
+
+SONAME_SHORT	= lib$(LIBNAME).so
+SONAME		= $(SONAME_SHORT).$(VERSION_MAJOR)
+SONAME_FULL	= $(SONAME_SHORT).$(VERSION)
+EOF
+}
+
+create_darwin_build_mk() {
+    create_common_build_mk $@
+
+    cat <<'EOF' >> mk/build.mk
+LLFLAGS		= -dynamiclib -current_version $(VERSION)
+
+STATIC      = lib$(LIBNAME).a
+
+SONAME_SHORT	= $(LIBNAME).dylib
+SONAME		= lib$(LIBNAME).$(VERSION_MAJOR).dylib
+SONAME_FULL	= lib$(LIBNAME).$(VERSION).dylib
+EOF
+}
+
+for arg in $@; do
+    case $arg in
+        "--enable-debug")
+            DEBUG=1
+        ;;
+    esac
+done
+
+if [ ! -d "mk" ]; then
+    mkdir -m 0755 mk
+fi
+
+case $OS in
+    Linux)
+        create_linux_config_h
+		create_linux_build_mk
+    ;;
+
+    Darwin)
+        create_darwin_config_h
+		create_darwin_build_mk
+    ;;
+esac

include/patty/kiss.h

@@ -25,8 +25,8 @@ enum patty_kiss_command {
     PATTY_KISS_RETURN      = 0xff
 };
 
-int patty_kiss_read(int fd, void *buf, size_t *len, int *channel);
+ssize_t patty_kiss_read(int fd, void *buf, size_t len, int *port);
 
-int patty_kiss_write(int fd, const void *buf, size_t len, int channel);
+ssize_t patty_kiss_write(int fd, const void *buf, size_t len, int port);
 
 #endif /* _PATTY_KISS_H */

src/Makefile

@@ -0,0 +1,29 @@
+include ../mk/build.mk
+
+INCLUDE_PATH	= ../include
+HEADER_SUBDIR	= birch
+
+CC		= $(CROSS)cc
+CFLAGS		= $(CGFLAGS) -fPIC -Wall -O2 -I$(INCLUDE_PATH)
+LDFLAGS		=
+
+HEADERS		= kiss.h ax25.h
+OBJS		= kiss.o
+
+PROGRAM		=
+
+AR		= $(CROSS)ar
+RANLIB		= $(CROSS)ranlib
+
+RM		= /bin/rm
+LN		= /bin/ln
+RMDIR		= /bin/rmdir
+INSTALL		= /usr/bin/install
+
+all: $(OBJS)
+
+$(OBJS): %.o: %.c $(HEADERS_BUILD)
+	$(CC) $(CFLAGS) -c $<
+
+clean:
+	$(RM) -f $(OBJS)

src/kiss.c

@@ -1,3 +1,8 @@
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <errno.h>
+
 #include <patty/kiss.h>
 
 enum kiss_flags {
@@ -19,7 +24,7 @@ ssize_t patty_kiss_read(int fd, void *buf, size_t len, int *port) {
     for (i=0; i<len; i++) {
         unsigned char c = ((char *)buf)[i];
 
-        if (flags & KISS_FRAME == 0) {
+        if ((flags & KISS_FRAME) == 0) {
             if (c == PATTY_KISS_FEND) {
                 flags |= KISS_FRAME;
             }
@@ -60,7 +65,7 @@ ssize_t patty_kiss_read(int fd, void *buf, size_t len, int *port) {
              * the high nybble to be the radio port number from which the
              * packet originated.
              */
-            if (c & 0x0f == 0) {
+            if ((c & 0x0f) == 0) {
                 *port = (c & 0xf0) >> 4;
 
                 continue;
@@ -94,13 +99,12 @@ ssize_t patty_kiss_write(int fd, const void *buf, size_t len, int port) {
         goto error_io;
     }
 
-    if (write_command(PATTY_KISS_DATA, port) < 0) {
+    if (write_command(fd, PATTY_KISS_DATA, port) < 0) {
         goto error_io;
     }
 
     for (i=0; i<len; i++) {
         unsigned char c = ((unsigned char *)buf)[i];
-        ssize_t res = 0;
         unsigned char *escape = NULL;
 
         switch (c) {
@@ -114,7 +118,12 @@ ssize_t patty_kiss_write(int fd, const void *buf, size_t len, int port) {
 
             default: {
                 end = i;
-                res = write(fd, &c, 1); break;
+
+                if (write(fd, &c, 1) < 0) {
+                    goto error_io;
+                }
+
+                break;
             }
         }