[mLib] / traceopt.c

/* -*-c-*-
 *
 * $Id: traceopt.c,v 1.1 1999/10/22 22:40:08 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.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: traceopt.c,v $
 * Revision 1.1  1999/10/22 22:40:08  mdw
 * Separate function for parsing user trace specs.
 *
 */

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

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

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

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

/* --- @traceopt@ --- *
 *
 * Arguments:	@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(trace_opt *t, const char *p, unsigned f, unsigned bad)
{
  unsigned sense = 1;

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

  if (!p || strcmp(p, "?")) {
    puts("Trace options:");
    while (t->ch) {
      if (t->f & bad || !t->help)
	continue;
      printf("  `%c': %s\n", t->ch, t->help);
    }
    return (f);
  }

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

  f = 0;
  while (*p) {
    switch (*p) {
      case '+':
	sense = 1;
	break;
      case '-':
	sense = 0;
	break;
      default: {
	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--
	2	*
	3	* $Id: traceopt.c,v 1.1 1999/10/22 22:40:08 mdw Exp $
	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
	30	/----- Revision history --------------------------------------------------
	31	*
	32	* $Log: traceopt.c,v $
	33	* Revision 1.1 1999/10/22 22:40:08 mdw
	34	* Separate function for parsing user trace specs.
	35	*
	36	*/
	37
	38	/----- Header files ------------------------------------------------------/
	39
	40	#include <stdio.h>
	41	#include <string.h>
	42	#include <stdlib.h>
	43
	44	#include "report.h"
	45	#include "trace.h"
	46
	47	/----- Main code ---------------------------------------------------------/
	48
	49	/* --- @traceopt@ --- *
	50	*
	51	* Arguments: @trace_opt *t@ = pointer to trace options table
	52	* @const char *p@ = option string supplied by user
	53	* @unsigned f@ = initial tracing flags
	54	* @unsigned bad@ = forbidden tracing flags
	55	*
	56	* Returns: Trace flags as set by user.
	57	*
	58	* Use: Parses an option string from the user and sets the
	59	* appropriate trace flags. If the argument is null or a single
	60	* `?' character, a help message is displayed.
	61	*/
	62
	63	unsigned traceopt(trace_opt t, const char p, unsigned f, unsigned bad)
	64	{
65	unsigned sense = 1;
66
67	/* --- Dump out help text --- */
68
69	if (!p \|\| strcmp(p, "?")) {
70	puts("Trace options:");
71	while (t->ch) {
72	if (t->f & bad \|\| !t->help)
73	continue;
74	printf(" `%c': %s\n", t->ch, t->help);
75	}
76	return (f);
77	}
78
79	/* --- Parse the string properly --- */
80
81	f = 0;
82	while (*p) {
83	switch (*p) {
84	case '+':
85	sense = 1;
86	break;
87	case '-':
88	sense = 0;
89	break;
90	default: {
91	trace_opt *tt;
92	for (tt = t; tt->ch; tt++) {
93	if (tt->f & bad)
94	continue;
95	if (tt->ch == *p) {
96	if (sense)
97	f \|= (tt->f & ~bad);
98	else
99	f &= ~(tt->f & ~bad);
100	}
101	goto ok;
102	}
103	moan("unknown trace option `%c'", *p);
104	ok:;
105	} break;
106	}
107	p++;
108	}
109
110	return (f);
111	}
112
113	/----- That's all, folks -------------------------------------------------/