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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: traceopt.c,v 1.3 2004/04/08 01:36:13 mdw Exp $ |
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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 | |
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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 | * |
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43 | * Arguments: @const trace_opt *t@ = pointer to trace options table |
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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 | |
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55 | unsigned traceopt(const trace_opt *t, const char *p, |
56 | unsigned f, unsigned bad) |
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57 | { |
58 | unsigned sense = 1; |
59 | |
60 | /* --- Dump out help text --- */ |
61 | |
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62 | if (!p || !strcmp(p, "?")) { |
63 | const trace_opt *tt; |
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64 | puts("Trace options:"); |
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65 | for (tt = t; tt->ch; tt++) { |
66 | if (!(tt->f & ~bad) || !tt->help) |
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67 | continue; |
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68 | printf(" `%c': %s\n", tt->ch, tt->help); |
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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: { |
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85 | const trace_opt *tt; |
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86 | for (tt = t; tt->ch; tt++) { |
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87 | if (!(tt->f & ~bad)) |
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88 | continue; |
89 | if (tt->ch == *p) { |
90 | if (sense) |
91 | f |= (tt->f & ~bad); |
92 | else |
93 | f &= ~(tt->f & ~bad); |
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94 | goto ok; |
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95 | } |
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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 -------------------------------------------------*/ |