debug.c

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static char rcsid[] = "debug.c,v 1.20 1996/01/04 22:13:41 duane Exp";
/*
 *  debug.c - debugging logging facilities.
 *
 *  Darren Hardy, [e-mail], February 1995
 * 
 *  Allows debugging by section and by level.  For example,
 *
 *      debug_reset()
 *      debug_enable(1, 9);                     enable section 1, level 9 
 *      debug_enable(2, 1);                     enable section 2, level 1
 *      Debug(1,8,("Looking up data...\n"));            printed
 *      Debug(3,1,("Looking up volume %d...\n", i));    not printed
 *      Debug(2,1,("Looking up volume...\n"));          printed
 *
 *  The debug enable calls should be done by the main program.  All
 *  debugging output is printed by the 'log' function.
 *
 *  Debug() is a macro, so you need to enclose the Log() args in ()'s.
 *
 *  ----------------------------------------------------------------------
 *  Copyright (c) 1994, 1995.  All rights reserved.
 *  
 *    The Harvest software was developed by the Internet Research Task
 *    Force Research Group on Resource Discovery (IRTF-RD):
 *  
 *          Mic Bowman of Transarc Corporation.
 *          Peter Danzig of the University of Southern California.
 *          Darren R. Hardy of the University of Colorado at Boulder.
 *          Udi Manber of the University of Arizona.
 *          Michael F. Schwartz of the University of Colorado at Boulder.
 *          Duane Wessels of the University of Colorado at Boulder.
 *  
 *    This copyright notice applies to software in the Harvest
 *    ``src/'' directory only.  Users should consult the individual
 *    copyright notices in the ``components/'' subdirectories for
 *    copyright information about other software bundled with the
 *    Harvest source code distribution.
 *  
 *  TERMS OF USE
 *    
 *    The Harvest software may be used and re-distributed without
 *    charge, provided that the software origin and research team are
 *    cited in any use of the system.  Most commonly this is
 *    accomplished by including a link to the Harvest Home Page
 *    (http://harvest.cs.colorado.edu/) from the query page of any
 *    Broker you deploy, as well as in the query result pages.  These
 *    links are generated automatically by the standard Broker
 *    software distribution.
 *    
 *    The Harvest software is provided ``as is'', without express or
 *    implied warranty, and with no support nor obligation to assist
 *    in its use, correction, modification or enhancement.  We assume
 *    no liability with respect to the infringement of copyrights,
 *    trade secrets, or any patents, and are not responsible for
 *    consequential damages.  Proper use of the Harvest software is
 *    entirely the responsibility of the user.
 *  
 *  DERIVATIVE WORKS
 *  
 *    Users may make derivative works from the Harvest software, subject 
 *    to the following constraints:
 *  
 *      - You must include the above copyright notice and these 
 *        accompanying paragraphs in all forms of derivative works, 
 *        and any documentation and other materials related to such 
 *        distribution and use acknowledge that the software was 
 *        developed at the above institutions.
 *  
 *      - You must notify IRTF-RD regarding your distribution of 
 *        the derivative work.
 *  
 *      - You must clearly notify users that your are distributing 
 *        a modified version and not the original Harvest software.
 *  
 *      - Any derivative product is also subject to these copyright 
 *        and use restrictions.
 *  
 *    Note that the Harvest software is NOT in the public domain.  We
 *    retain copyright, as specified above.
 *  
 *  HISTORY OF FREE SOFTWARE STATUS
 *  
 *    Originally we required sites to license the software in cases
 *    where they were going to build commercial products/services
 *    around Harvest.  In June 1995 we changed this policy.  We now
 *    allow people to use the core Harvest software (the code found in
 *    the Harvest ``src/'' directory) for free.  We made this change
 *    in the interest of encouraging the widest possible deployment of
 *    the technology.  The Harvest software is really a reference
 *    implementation of a set of protocols and formats, some of which
 *    we intend to standardize.  We encourage commercial
 *    re-implementations of code complying to this set of standards.  
 *  
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define MAIN
#include "util.h"

int Harvest_debug_levels[MAX_DEBUG_LEVELS];
int Harvest_do_debug = 0;

/*
 *  debug_reset() - Reset debugging routines.
 */
void debug_reset()
{
    int i;

    for (i = 0; i < MAX_DEBUG_LEVELS; i++)
	Harvest_debug_levels[i] = -1;
    Harvest_do_debug = 0;
}

/*
 *  debug_enable() - Enables debugging output for section s, level l.
 */
void debug_enable(s, l)
     int s, l;
{
#ifdef USE_NO_DEBUGGING
    return;
#else
    if (s > MAX_DEBUG_LEVELS || s < 0)
	return;
    Harvest_debug_levels[s] = l;
    Harvest_do_debug = 1;
    Log("Enabling debugging for Section %d, level %d.\n", s, l == -2 ? 99 : l);
#endif
}
/*
 *  debug_disable() - Disables debugging output for section s, level l.
 */
void debug_disable(s)
     int s;
{
    if (s > MAX_DEBUG_LEVELS || s < 0)
	return;
    Log("Disabling debugging for Section %d.\n", s);
    Harvest_debug_levels[s] = -1;
}

/*
 *  debug_ok() - Returns non-zero if the caller is debugging the
 *  given section and level.  If level is -2, then all debugging is used.
 *  In general, level 1 should be minimal and level 9 the max.
 */
int debug_ok(s, lev)
     int s, lev;
{
#ifdef USE_NO_DEBUGGING
    return 0;
#else
    /* totally disabled */
    if (Harvest_do_debug == 0)
	return 0;
    /* section out of range */
    if (s < 0 || s > MAX_DEBUG_LEVELS)
	return 0;
    /* -1 means disabled for that section */
    if (Harvest_debug_levels[s] == -1)
	return 0;
    /* -2 means fully enabled for that section */
    if (Harvest_debug_levels[s] == -2)
	return 1;
    /* enabled if lev is less than or equal to section level */
    if (lev <= Harvest_debug_levels[s])
	return 1;
    return 0;
#endif
}

/*
 *  debug_flag() - Processes a -D flag and runs debug_enable()
 *  Flags are of the form:
 *      -Ds     Enable debugging for section s
 *      -D-s    Disable debugging for section s
 *      -Ds,l   Enable debugging for section s, level l
 *      -DALL   Everything enabled
 */
void debug_flag(flag)
     char *flag;
{
    int s = -1, l = -2, i;
    char *p = NULL;

    if (flag == NULL || strncmp(flag, "-D", 2) != 0)
	return;

    if (!strcmp(flag, "-DALL")) {
	for (i = 0; i < MAX_DEBUG_LEVELS; i++) {
	    debug_enable(i, -2);
	}
	return;
    }
    p = flag;
    p += 2;			/* skip -D */

    s = atoi(p);
    while (*p && *p != ',')
	p++;
    if (*p)
	l = atoi(++p);
    if (s < 0)
	debug_disable(-s);
    else
	debug_enable(s, l);
}

/*
 *  debug_init() - Initializes debugging from $HARVEST_DEBUG variable
 *
 */
void debug_init()
{
    char *s = NULL;
    char *t = NULL;
    char *u = NULL;

    s = getenv("HARVEST_DEBUG");
    if (s == (char *) 0)
	return;

    t = xstrdup(s);

    u = strtok(t, " \t\n");
    do {
	debug_flag(u);
    } while ((u = strtok((char *) 0, " \t\n")));
    xfree(t);
}