| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: traceopt.c,v 1.2 2001/02/03 16:25:43 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 1.2 2001/02/03 16:25:43 mdw |
| 34 | * Various bug fixes: understand requests for help properly, and fix the |
| 35 | * logic for flag letters with `bad' flags. |
| 36 | * |
| 37 | * Revision 1.1 1999/10/22 22:40:08 mdw |
| 38 | * Separate function for parsing user trace specs. |
| 39 | * |
| 40 | */ |
| 41 | |
| 42 | /*----- Header files ------------------------------------------------------*/ |
| 43 | |
| 44 | #include <stdio.h> |
| 45 | #include <string.h> |
| 46 | #include <stdlib.h> |
| 47 | |
| 48 | #include "report.h" |
| 49 | #include "trace.h" |
| 50 | |
| 51 | /*----- Main code ---------------------------------------------------------*/ |
| 52 | |
| 53 | /* --- @traceopt@ --- * |
| 54 | * |
| 55 | * Arguments: @const trace_opt *t@ = pointer to trace options table |
| 56 | * @const char *p@ = option string supplied by user |
| 57 | * @unsigned f@ = initial tracing flags |
| 58 | * @unsigned bad@ = forbidden tracing flags |
| 59 | * |
| 60 | * Returns: Trace flags as set by user. |
| 61 | * |
| 62 | * Use: Parses an option string from the user and sets the |
| 63 | * appropriate trace flags. If the argument is null or a single |
| 64 | * `?' character, a help message is displayed. |
| 65 | */ |
| 66 | |
| 67 | unsigned traceopt(const trace_opt *t, const char *p, |
| 68 | unsigned f, unsigned bad) |
| 69 | { |
| 70 | unsigned sense = 1; |
| 71 | |
| 72 | /* --- Dump out help text --- */ |
| 73 | |
| 74 | if (!p || !strcmp(p, "?")) { |
| 75 | const trace_opt *tt; |
| 76 | puts("Trace options:"); |
| 77 | for (tt = t; tt->ch; tt++) { |
| 78 | if (!(tt->f & ~bad) || !tt->help) |
| 79 | continue; |
| 80 | printf(" `%c': %s\n", tt->ch, tt->help); |
| 81 | } |
| 82 | return (f); |
| 83 | } |
| 84 | |
| 85 | /* --- Parse the string properly --- */ |
| 86 | |
| 87 | f = 0; |
| 88 | while (*p) { |
| 89 | switch (*p) { |
| 90 | case '+': |
| 91 | sense = 1; |
| 92 | break; |
| 93 | case '-': |
| 94 | sense = 0; |
| 95 | break; |
| 96 | default: { |
| 97 | const trace_opt *tt; |
| 98 | for (tt = t; tt->ch; tt++) { |
| 99 | if (!(tt->f & ~bad)) |
| 100 | continue; |
| 101 | if (tt->ch == *p) { |
| 102 | if (sense) |
| 103 | f |= (tt->f & ~bad); |
| 104 | else |
| 105 | f &= ~(tt->f & ~bad); |
| 106 | goto ok; |
| 107 | } |
| 108 | } |
| 109 | moan("unknown trace option `%c'", *p); |
| 110 | ok:; |
| 111 | } break; |
| 112 | } |
| 113 | p++; |
| 114 | } |
| 115 | |
| 116 | return (f); |
| 117 | } |
| 118 | |
| 119 | /*----- That's all, folks -------------------------------------------------*/ |