[mLib] / traceopt.c

/* -*-c-*-
 *
 * $Id: traceopt.c,v 1.3 2004/04/08 01:36:13 mdw Exp $
 *
 * Parsing tracing options
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of the mLib utilities library.
 *
 * mLib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * mLib 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 Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with mLib; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

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

#include "report.h"
#include "trace.h"

/*----- Main code ---------------------------------------------------------*/

/* --- @traceopt@ --- *
 *
 * Arguments:	@const trace_opt *t@ = pointer to trace options table
 *		@const char *p@ = option string supplied by user
 *		@unsigned f@ = initial tracing flags
 *		@unsigned bad@ = forbidden tracing flags
 *
 * Returns:	Trace flags as set by user.
 *
 * Use:		Parses an option string from the user and sets the
 *		appropriate trace flags.  If the argument is null or a single
 *		`?' character, a help message is displayed.
 */

unsigned traceopt(const trace_opt *t, const char *p,
		  unsigned f, unsigned bad)
{
  unsigned sense = 1;

  /* --- Dump out help text --- */

  if (!p || !strcmp(p, "?")) {
    const trace_opt *tt;
    puts("Trace options:");
    for (tt = t; tt->ch; tt++) {
      if (!(tt->f & ~bad) || !tt->help)
	continue;
      printf("  `%c': %s\n", tt->ch, tt->help);
    }
    return (f);
  }

  /* --- Parse the string properly --- */

  f = 0;
  while (*p) {
    switch (*p) {
      case '+':
	sense = 1;
	break;
      case '-':
	sense = 0;
	break;
      default: {
	const trace_opt *tt;
	for (tt = t; tt->ch; tt++) {
	  if (!(tt->f & ~bad))
	    continue;
	  if (tt->ch == *p) {
	    if (sense)
	      f |= (tt->f & ~bad);
	    else
	      f &= ~(tt->f & ~bad);
	    goto ok;
	  }
	}
	moan("unknown trace option `%c'", *p);
      ok:;
      } break;
    }
    p++;
  }

  return (f);
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
4ce6f42e	1	/* --c--
4ce6f42e	2	*
8656dc50	3	* $Id: traceopt.c,v 1.3 2004/04/08 01:36:13 mdw Exp $
4ce6f42e	4	*
	5	* Parsing tracing options
	6	*
	7	* (c) 1999 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of the mLib utilities library.
	13	*
	14	* mLib is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU Library General Public License as
	16	* published by the Free Software Foundation; either version 2 of the
	17	* License, or (at your option) any later version.
	18	*
	19	* mLib is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU Library General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU Library General Public
	25	* License along with mLib; if not, write to the Free
	26	* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
	27	* MA 02111-1307, USA.
	28	*/
	29
4ce6f42e	30	/----- Header files ------------------------------------------------------/
	31
	32	#include <stdio.h>
	33	#include <string.h>
	34	#include <stdlib.h>
	35
	36	#include "report.h"
	37	#include "trace.h"
	38
	39	/----- Main code ---------------------------------------------------------/
	40
	41	/* --- @traceopt@ --- *
	42	*
ba9edb26	43	* Arguments: @const trace_opt *t@ = pointer to trace options table
4ce6f42e	44	* @const char *p@ = option string supplied by user
	45	* @unsigned f@ = initial tracing flags
	46	* @unsigned bad@ = forbidden tracing flags
	47	*
	48	* Returns: Trace flags as set by user.
	49	*
	50	* Use: Parses an option string from the user and sets the
	51	* appropriate trace flags. If the argument is null or a single
	52	* `?' character, a help message is displayed.
	53	*/
	54
ba9edb26	55	unsigned traceopt(const trace_opt t, const char p,
ba9edb26	56	unsigned f, unsigned bad)
4ce6f42e	57	{
	58	unsigned sense = 1;
	59
	60	/* --- Dump out help text --- */
	61
ba9edb26	62	if (!p \|\| !strcmp(p, "?")) {
ba9edb26	63	const trace_opt *tt;
4ce6f42e	64	puts("Trace options:");
ba9edb26	65	for (tt = t; tt->ch; tt++) {
ba9edb26	66	if (!(tt->f & ~bad) \|\| !tt->help)
4ce6f42e	67	continue;
ba9edb26	68	printf(" `%c': %s\n", tt->ch, tt->help);
4ce6f42e	69	}
	70	return (f);
	71	}
	72
	73	/* --- Parse the string properly --- */
	74
	75	f = 0;
	76	while (*p) {
	77	switch (*p) {
	78	case '+':
	79	sense = 1;
	80	break;
	81	case '-':
	82	sense = 0;
	83	break;
	84	default: {
ba9edb26	85	const trace_opt *tt;
4ce6f42e	86	for (tt = t; tt->ch; tt++) {
ba9edb26	87	if (!(tt->f & ~bad))
4ce6f42e	88	continue;
	89	if (tt->ch == *p) {
	90	if (sense)
	91	f \|= (tt->f & ~bad);
	92	else
	93	f &= ~(tt->f & ~bad);
ba9edb26	94	goto ok;
4ce6f42e	95	}
4ce6f42e	96	}
	97	moan("unknown trace option `%c'", *p);
	98	ok:;
	99	} break;
	100	}
	101	p++;
	102	}
	103
	104	return (f);
	105	}
	106
	107	/----- That's all, folks -------------------------------------------------/