spectrans/parser/errlog.c

	errlog.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 *  errlog -- error logging facility for application programs
 */

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

/*  Statics (this object is not threadable). */
static int Severity;
static struct location {
    char *l_file;
    int l_lineno;
    char *l_tag;
    char *l_line;
} Location;

/* Indentation */
static int  Trace_indent;
/* XXX YES, its 80 spaces !@#$%^ */
static char Trace_padding[] =
    "                                              "
    "                                  ";

#define INDENT &Trace_padding[80-(Trace_indent*4)]
#define PRINTHDR    INPUT

/*
 * errlog -- simulate the syslog printf-like interface, but
 *  with a first argument oriented toward reporting
 *  application errors.
 */
/*VARARGS2*/
void
errlog(const int descriptor, const char *format, ...)
{
    va_list ap;

    va_start(ap, format);
    if ((Severity < (descriptor & FATAL)) &&
        ((descriptor & FATAL) != FATAL)) {
        /* We don't need to say/do anything. */
        return;
    }

    /* Produce the message. */
    (void) fflush(stdout); /* Synchronize streams. */
    if ((descriptor & PRINTHDR) != 0) {
        if (Location.l_file == NULL) {
            (void) fprintf(stderr, "programmer error, logerr "
                "told to print file, line number, "
                "but file was not set.\n");
        } else {
            (void) fprintf(stderr, "\"%s\", line %d: ",
                Location.l_file, Location.l_lineno);
        }
    }

    /* Indent/outdent. */
    if (descriptor & INDENTED) {
        (void) fprintf(stderr, "%s", INDENT);
        Trace_indent = (Trace_indent < 20)? Trace_indent + 1: 20;
    } else if (descriptor & OUTDENTED) {
        Trace_indent = (Trace_indent > 0)? Trace_indent - 1: 0;
        (void) fprintf(stderr, "%s", INDENT);
    } else {
        (void) fprintf(stderr, "%s", INDENT);
    }

    /* Print the stuff we did all this for. */
    (void) vfprintf(stderr, format, ap);

    if ((descriptor & INPUT) && Location.l_line != NULL) {
        /* Emit trailers. Formatting TBD. */
        (void) putc('\n', stderr);
        (void) fprintf(stderr, "\tLine was: %s %s",
            Location.l_tag, Location.l_line);
    }
    (void) putc('\n', stderr);
    (void) fflush(stderr); /* No-op on Solaris. */

    if ((descriptor & FATAL) == FATAL) {
        /* Say goodbye! */
        exit(1);
    }
    va_end(ap);
}

/*
 * seterrline -- tell errlog what the context of the error is.
 */
void
seterrline(const int lineno, const char *file,
    const char *tag, const char *line)
{
    Location.l_lineno = lineno;
    Location.l_file = (char *)file;
    Location.l_tag = (char *)tag;
    Location.l_line = (char *)line;
}

/*
 * seterrseverity -- set the severity/loudness variable.
 *  This is traditionally the ``Verbosity'' level.
 */
void
seterrseverity(const int loudness)
{
    Severity = (loudness & FATAL);
}