Added new global macros for ERROR/WARNING/VERBOSE, use it

src/global.h

@@ -0,0 +1,20 @@
+
+#ifndef GLOBAL_H
+#define GLOBAL_H
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+extern int simulate;
+extern int noverify;
+extern int verbose;
+
+#define VERBOSE(format, ...) do { if ( verbose ) { fprintf(stderr, format, ##__VA_ARGS__); } } while (0)
+#define ERROR(errno, format, ...) do { fprintf(stderr, "Error: "); fprintf(stderr, format, ##__VA_ARGS__); if ( errno ) fprintf(stderr, ": %s\n", strerror(errno)); else fprintf(stderr, "\n"); } while (0)
+#define WARNING(format, ...) do { fprintf(stderr, "Warning: "); fprintf(stderr, format, ##__VA_ARGS__); fprintf(stderr, "\n"); } while (0)
+
+#define ALLOC_ERROR() do { ERROR(0, "Cannot allocate memory"); } while (0)
+#define ALLOC_ERROR_RETURN(...) do { ALLOC_ERROR(); return __VA_ARGS__; } while (0)
+
+#endif