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#include "Python.h"
#include "f2c.h"

/*
  From the original manpage:
  XERBLA is an error handler for the LAPACK routines. 
  It is called by an LAPACK routine if an input parameter has an invalid value.
  A message is printed and execution stops.

  Instead of printing a message and stopping the execution, a
  ValueError is raised with the message.

  Parameters:
        srname: Subroutine name to use in error message, maximum six characters.
	        Spaces at the end are skipped.
	info: Number of the invalid parameter.
*/

int xerbla_(char *srname, integer *info)
{
        char format[] = "On entry to %.*s"			\
		" parameter number %d had an illegal value";
	char buf[70]; /* 6 for name, 4 for param. num. */
	
	int len = 0; /* length of subroutine name*/
	while( len<6 && srname[len]!='\0' )
		len++;
	while( len && srname[len-1]==' ' )
		len--;
	snprintf(buf, sizeof(buf), format, len, srname, *info);
	PyErr_SetString(PyExc_ValueError, buf);
	return 0;
}