diff -r d59bea55db9b -r c445c931472f src/glpenv04.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/glpenv04.c	Mon Dec 06 13:09:21 2010 +0100
@@ -0,0 +1,124 @@
+/* glpenv04.c (error handling) */
+
+/***********************************************************************
+*  This code is part of GLPK (GNU Linear Programming Kit).
+*
+*  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+*  2009, 2010 Andrew Makhorin, Department for Applied Informatics,
+*  Moscow Aviation Institute, Moscow, Russia. All rights reserved.
+*  E-mail: <mao@gnu.org>.
+*
+*  GLPK is free software: you can redistribute it and/or modify it
+*  under the terms of the GNU General Public License as published by
+*  the Free Software Foundation, either version 3 of the License, or
+*  (at your option) any later version.
+*
+*  GLPK is distributed in the hope that it will be useful, but WITHOUT
+*  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+*  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+*  License for more details.
+*
+*  You should have received a copy of the GNU General Public License
+*  along with GLPK. If not, see <http://www.gnu.org/licenses/>.
+***********************************************************************/
+
+#include "glpapi.h"
+
+/***********************************************************************
+*  NAME
+*
+*  glp_error - display error message and terminate execution
+*
+*  SYNOPSIS
+*
+*  void glp_error(const char *fmt, ...);
+*
+*  DESCRIPTION
+*
+*  The routine glp_error (implemented as a macro) formats its
+*  parameters using the format control string fmt, writes the formatted
+*  message to the terminal, and abnormally terminates the program. */
+
+static void error(const char *fmt, ...)
+{     ENV *env = get_env_ptr();
+      va_list arg;
+      env->term_out = GLP_ON;
+      va_start(arg, fmt);
+      xvprintf(fmt, arg);
+      va_end(arg);
+      xprintf("Error detected in file %s at line %d\n", env->err_file,
+         env->err_line);
+      if (env->err_hook != NULL)
+         env->err_hook(env->err_info);
+      abort();
+      exit(EXIT_FAILURE);
+      /* no return */
+}
+
+_glp_error glp_error_(const char *file, int line)
+{     ENV *env = get_env_ptr();
+      env->err_file = file;
+      env->err_line = line;
+      return error;
+}
+
+/***********************************************************************
+*  NAME
+*
+*  glp_assert - check for logical condition
+*
+*  SYNOPSIS
+*
+*  #include "glplib.h"
+*  void glp_assert(int expr);
+*
+*  DESCRIPTION
+*
+*  The routine glp_assert (implemented as a macro) checks for a logical
+*  condition specified by the parameter expr. If the condition is false
+*  (i.e. the value of expr is zero), the routine writes a message to
+*  the terminal and abnormally terminates the program. */
+
+void glp_assert_(const char *expr, const char *file, int line)
+{     glp_error_(file, line)("Assertion failed: %s\n", expr);
+      /* no return */
+}
+
+/***********************************************************************
+*  NAME
+*
+*  glp_error_hook - install hook to intercept abnormal termination
+*
+*  SYNOPSIS
+*
+*  void glp_error_hook(void (*func)(void *info), void *info);
+*
+*  DESCRIPTION
+*
+*  The routine glp_error_hook installs a user-defined hook routine to
+*  intercept abnormal termination.
+*
+*  The parameter func specifies the user-defined hook routine. It is
+*  called from the routine glp_error before the latter calls the abort
+*  function to abnormally terminate the application program because of
+*  fatal error. The parameter info is a transit pointer, specified in
+*  the corresponding call to the routine glp_error_hook; it may be used
+*  to pass some information to the hook routine.
+*
+*  To uninstall the hook routine the parameters func and info should be
+*  specified as NULL. */
+
+void glp_error_hook(void (*func)(void *info), void *info)
+{     ENV *env = get_env_ptr();
+      if (func == NULL)
+      {  env->err_hook = NULL;
+         env->err_info = NULL;
+      }
+      else
+      {  env->err_hook = func;
+         env->err_info = info;
+      }
+      return;
+}
+
+/* eof */