e82f7154 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: scan.c,v 1.1 1999/07/01 08:56:23 mdw Exp $ |
4 | * |
5 | * Character scanners |
6 | * |
7 | * (c) 1999 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
14 | * `fw' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `fw' 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 General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with `fw'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: scan.c,v $ |
32 | * Revision 1.1 1999/07/01 08:56:23 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include "config.h" |
40 | |
41 | #include <stdio.h> |
42 | #include <stdlib.h> |
43 | #include <string.h> |
44 | |
45 | #include <mLib/dstr.h> |
46 | |
47 | #include "scan.h" |
48 | |
49 | /*----- Main code ---------------------------------------------------------*/ |
50 | |
51 | /* --- Generic scanner setup --- */ |
52 | |
53 | static void scan_init(scanner *sc, scan_ops *ops, const char *src) |
54 | { |
55 | sc->ops = ops; |
56 | sc->line = 1; |
57 | sc->src = src; |
58 | dstr_create(&sc->d); |
59 | } |
60 | |
61 | /* --- @argv@ scanner --- */ |
62 | |
63 | static int argv_scan(void *p) |
64 | { |
65 | scan_argvctx *c = p; |
66 | int ch; |
67 | |
68 | if (c->ch != EOF) { |
69 | ch = c->ch; |
70 | c->ch = EOF; |
71 | } else if (*c->p) |
72 | ch = *c->p++; |
73 | else if (*c->pp) { |
74 | c->p = *c->pp++; |
75 | ch = '\n'; |
76 | } else |
77 | ch = EOF; |
78 | |
79 | return (ch); |
80 | } |
81 | |
82 | static void argv_unscan(int ch, void *p) |
83 | { |
84 | scan_argvctx *c = p; |
85 | c->ch = ch; |
86 | } |
87 | |
88 | void scan_argvinit(scan_argvctx *c, char **pp) |
89 | { |
90 | static struct scan_ops ops = { argv_scan, argv_unscan }; |
91 | c->p = *pp++; |
92 | c->pp = pp; |
93 | c->ch = EOF; |
94 | scan_init(&c->sc, &ops, "<args>"); |
95 | } |
96 | |
97 | /* --- File scanner --- */ |
98 | |
99 | static int file_scan(void *p) |
100 | { |
101 | scan_filectx *c = p; |
102 | return (getc(c->fp)); |
103 | } |
104 | |
105 | static void file_unscan(int ch, void *p) |
106 | { |
107 | scan_filectx *c = p; |
108 | ungetc(ch, c->fp); |
109 | } |
110 | |
111 | void scan_fileinit(scan_filectx *c, FILE *fp, const char *file) |
112 | { |
113 | static struct scan_ops ops = { file_scan, file_unscan }; |
114 | c->fp = fp; |
115 | scan_init(&c->sc, &ops, file); |
116 | } |
117 | |
118 | /* --- Miscellaneous functions --- */ |
119 | |
120 | void scan_destroy(void *p) |
121 | { |
122 | scanner *sc = p; |
123 | dstr_destroy(&sc->d); |
124 | } |
125 | |
126 | /*----- That's all, folks -------------------------------------------------*/ |