error-msg.c

/* Error message printing. */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

#include "error-msg.h"

/* The name of the program running and of the source file the program
   is reading from.  The default values are just for debugging. */

static const char * program_name = "PROGRAM NAME UNDEFINED";
static const char * source_name = "SOURCE NAME UNDEFINED";
int * source_line = NULL;

#define DO_PRINT(file)				\
    va_start (a, format);			\
    vfprintf (file, format, a);			\
    fprintf (file, ".\n");			\
    va_end (a)


/* Print a warning message with a line number.  */

void PRINT_FORMAT (2, 3)
    lwarning (unsigned line_number, const char * format, ...)
{
    va_list a;

    fprintf (stderr, "%s:%u: warning: ", source_name, line_number);

    DO_PRINT (stderr);
}

/* Print an error message for a specified line and then exit */

NO_RETURN PRINT_FORMAT (1, 2)
line_error (const char * format, ... )
{
    va_list a;

    fprintf (stderr, "%s:%u: error: ", source_name, * source_line);

    DO_PRINT (stderr);

    // exit ok
    exit (EXIT_FAILURE);
}

/* Print a warning message with a line number.  */

void PRINT_FORMAT (1, 2)
    line_warning (const char * format, ... )
{
    va_list a;

    fprintf (stderr, "%s:%u: warning: ", source_name, * source_line);

    DO_PRINT (stderr);
}

/* Print a warning message with a line number.  */

void PRINT_FORMAT (1, 2)
line_info (const char * format, ... )
{
    va_list a;

    fprintf (stdout, "%s:%u: ", source_name, * source_line);

    DO_PRINT (stdout);
}

/* Print the specified error message and exit. */

NO_RETURN PRINT_FORMAT (1, 2)
error (const char * format, ... )
{
    va_list a;

    fprintf ( stderr, "%s: error: ", program_name );

    DO_PRINT (stderr);

    // exit ok
    exit (EXIT_FAILURE);
}

/* Print a warning message. */

void PRINT_FORMAT (1, 2)
warning (const char * format, ... )
{
    va_list a;

    fprintf ( stderr, "%s: warning: ", program_name );
  
    DO_PRINT (stderr);
}

/* Print an internal error message.  This is for the case that
   something that should never happen occurs, such as a `default:' in
   a switch statement that is used to catch errors. */

NO_RETURN  PRINT_FORMAT (3, 4)
bug (const char * file, unsigned line, const char * format, ... )
{
    va_list a;

    fprintf ( stderr, "%s:%s:%u: internal error: ", 
	      program_name, file, line );
    fprintf ( stderr, "%s:%s:%u: internal error: ", 
	      program_name, file, line );

    DO_PRINT (stderr);

    // exit ok
    exit (EXIT_FAILURE);
}

void
set_program_name (const char * name)
{
    program_name = name;
}