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+/*  $Id$
+**
+**  Utility functions.
+**
+**  This is a variety of utility functions that are used internally by the
+**  wallet client.  Many of them came originally from INN.
+**
+**  Written by Russ Allbery <rra@stanford.edu>
+**  Copyright 2002, 2003, 2004, 2005, 2006, 2007
+**      Board of Trustees, Leland Stanford Jr. University
+**  Copyright (c) 2004, 2005, 2006, 2007
+**      by Internet Systems Consortium, Inc. ("ISC")
+**  Copyright (c) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
+**      2002, 2003 by The Internet Software Consortium and Rich Salz
+**
+**  See README for licensing terms.
+*/
+
+#ifndef UTIL_UTIL_H
+#define UTIL_UTIL_H 1
+
+#include <config.h>
+#include <portable/gssapi.h>
+
+#include <stdarg.h>
+#include <sys/types.h>
+
+/* __attribute__ is available in gcc 2.5 and later, but only with gcc 2.7
+   could you use the __format__ form of the attributes, which is what we use
+   (to avoid confusion with other macros). */
+#ifndef __attribute__
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
+#  define __attribute__(spec)   /* empty */
+# endif
+#endif
+
+/* Used for unused parameters to silence gcc warnings. */
+#define UNUSED  __attribute__((__unused__))
+
+/* BEGIN_DECLS is used at the beginning of declarations so that C++
+   compilers don't mangle their names.  END_DECLS is used at the end. */
+#undef BEGIN_DECLS
+#undef END_DECLS
+#ifdef __cplusplus
+# define BEGIN_DECLS    extern "C" {
+# define END_DECLS      }
+#else
+# define BEGIN_DECLS    /* empty */
+# define END_DECLS      /* empty */
+#endif
+
+BEGIN_DECLS
+
+/* Forward declarations to avoid includes. */
+struct addrinfo;
+struct iovec;
+struct sockaddr;
+
+/* Concatenate NULL-terminated strings into a newly allocated string. */
+extern char *concat(const char *first, ...);
+
+/* Given a base path and a file name, create a newly allocated path string.
+   The name will be appended to base with a / between them.  Exceptionally, if
+   name begins with a slash, it will be strdup'd and returned as-is. */
+extern char *concatpath(const char *base, const char *name);
+
+/* The reporting functions.  The ones prefaced by "sys" add a colon, a space,
+   and the results of strerror(errno) to the output and are intended for
+   reporting failures of system calls. */
+extern void debug(const char *, ...)
+    __attribute__((__format__(printf, 1, 2)));
+extern void notice(const char *, ...)
+    __attribute__((__format__(printf, 1, 2)));
+extern void sysnotice(const char *, ...)
+    __attribute__((__format__(printf, 1, 2)));
+extern void warn(const char *, ...)
+    __attribute__((__format__(printf, 1, 2)));
+extern void syswarn(const char *, ...)
+    __attribute__((__format__(printf, 1, 2)));
+extern void die(const char *, ...)
+    __attribute__((__noreturn__, __format__(printf, 1, 2)));
+extern void sysdie(const char *, ...)
+    __attribute__((__noreturn__, __format__(printf, 1, 2)));
+
+/* Set the handlers for various message functions.  All of these functions
+   take a count of the number of handlers and then function pointers for each
+   of those handlers.  These functions are not thread-safe; they set global
+   variables. */
+extern void message_handlers_debug(int count, ...);
+extern void message_handlers_notice(int count, ...);
+extern void message_handlers_warn(int count, ...);
+extern void message_handlers_die(int count, ...);
+
+/* Some useful handlers, intended to be passed to message_handlers_*.  All
+   handlers take the length of the formatted message, the format, a variadic
+   argument list, and the errno setting if any. */
+extern void message_log_stdout(int, const char *, va_list, int);
+extern void message_log_stderr(int, const char *, va_list, int);
+extern void message_log_syslog_debug(int, const char *, va_list, int);
+extern void message_log_syslog_info(int, const char *, va_list, int);
+extern void message_log_syslog_notice(int, const char *, va_list, int);
+extern void message_log_syslog_warning(int, const char *, va_list, int);
+extern void message_log_syslog_err(int, const char *, va_list, int);
+extern void message_log_syslog_crit(int, const char *, va_list, int);
+
+/* The type of a message handler. */
+typedef void (*message_handler_func)(int, const char *, va_list, int);
+
+/* If non-NULL, called before exit and its return value passed to exit. */
+extern int (*message_fatal_cleanup)(void);
+
+/* If non-NULL, prepended (followed by ": ") to all messages printed by either
+   message_log_stdout or message_log_stderr. */
+extern const char *message_program_name;
+
+/* The functions are actually macros so that we can pick up the file and line
+   number information for debugging error messages without the user having to
+   pass those in every time. */
+#define xcalloc(n, size)        x_calloc((n), (size), __FILE__, __LINE__)
+#define xmalloc(size)           x_malloc((size), __FILE__, __LINE__)
+#define xrealloc(p, size)       x_realloc((p), (size), __FILE__, __LINE__)
+#define xstrdup(p)              x_strdup((p), __FILE__, __LINE__)
+#define xstrndup(p, size)       x_strndup((p), (size), __FILE__, __LINE__)
+#define xvasprintf(p, f, a)     x_vasprintf((p), (f), (a), __FILE__, __LINE__)
+
+/* asprintf is a special case since it takes variable arguments.  If we have
+   support for variadic macros, we can still pass in the file and line and
+   just need to put them somewhere else in the argument list than last.
+   Otherwise, just call x_asprintf directly.  This means that the number of
+   arguments x_asprintf takes must vary depending on whether variadic macros
+   are supported. */
+#ifdef HAVE_C99_VAMACROS
+# define xasprintf(p, f, ...) \
+    x_asprintf((p), __FILE__, __LINE__, (f), __VA_ARGS__)
+#elif HAVE_GNU_VAMACROS
+# define xasprintf(p, f, args...) \
+    x_asprintf((p), __FILE__, __LINE__, (f), args)
+#else
+# define xasprintf x_asprintf
+#endif
+
+/* Last two arguments are always file and line number.  These are internal
+   implementations that should not be called directly.  ISO C99 says that
+   identifiers beginning with _ and a lowercase letter are reserved for
+   identifiers of file scope, so while the position of libraries in the
+   standard isn't clear, it's probably not entirely kosher to use _xmalloc
+   here.  Use x_malloc instead. */
+extern void *x_calloc(size_t, size_t, const char *, int);
+extern void *x_malloc(size_t, const char *, int);
+extern void *x_realloc(void *, size_t, const char *, int);
+extern char *x_strdup(const char *, const char *, int);
+extern char *x_strndup(const char *, size_t, const char *, int);
+extern int x_vasprintf(char **, const char *, va_list, const char *, int);
+
+/* asprintf special case. */
+#if HAVE_C99_VAMACROS || HAVE_GNU_VAMACROS
+extern int x_asprintf(char **, const char *, int, const char *, ...);
+#else
+extern int x_asprintf(char **, const char *, ...);
+#endif
+
+/* Failure handler takes the function, the size, the file, and the line. */
+typedef void (*xmalloc_handler_type)(const char *, size_t, const char *, int);
+
+/* The default error handler. */
+void xmalloc_fail(const char *, size_t, const char *, int);
+
+/* Assign to this variable to choose a handler other than the default, which
+   just calls sysdie. */
+extern xmalloc_handler_type xmalloc_error_handler;
+
+END_DECLS
+
+#endif /* UTIL_UTIL_H */