Add replacement library files

lib/Makefile

@@ -0,0 +1,23 @@
+#
+# Extra functions which may not be available everywhere
+#
+
+include ../MCONFIG
+include ../MRULES
+
+all:	libxtra.a
+
+install:
+
+clean:
+	-rm -f *.a *.o
+
+spotless: clean
+	-rm -f *~
+
+libxtra.a: $(LIBOBJS)
+	-rm -f libxtra.a
+	$(AR) libxtra.a $(LIBOBJS)
+	$(RANLIB) libxtra.a
+
+

lib/bsdsignal.c

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+/*
+ * bsdsignal.c
+ *
+ * Use sigaction() to simulate BSD signal()
+ */
+
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+
+void bsd_signal(int signum, void (*handler)(int))
+{
+  struct sigaction action;
+
+  memset(&action, 0, sizeof action);
+  action.sa_handler = handler;
+  sigemptyset(&action.sa_mask);
+  action.sa_flags = SA_RESTART;
+  
+  sigaction(hander, action, NULL);
+}

lib/xmalloc.c

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+/*
+ * xmalloc.c
+ *
+ * Simple error-checking version of malloc()
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+void *xmalloc(size_t size)
+{
+  void *p = malloc(size);
+
+  if ( !p ) {
+    fprintf(stderr, "Out of memory!\n");
+    exit(128);
+  }
+
+  return p;
+}

lib/xstrdup.c

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+/*
+ * xstrdup.c
+ *
+ * Simple error-checking version of strdup()
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+char *xstrdup(const char *s)
+{
+  char *p = strdup(s);
+
+  if ( !p ) {
+    fprintf(stderr, "Out of memory!\n");
+    exit(128);
+  }
+
+  return p;
+}