2ec1e693 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: serial.c,v 1.1 2002/01/25 19:34:45 mdw Exp $ |
4 | * |
5 | * Common serial functionality |
6 | * |
7 | * (c) 2001 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Jog: Programming for a jogging machine. |
13 | * |
14 | * Jog 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 | * Jog 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 Jog; 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: serial.c,v $ |
32 | * Revision 1.1 2002/01/25 19:34:45 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include <ctype.h> |
40 | #include <stdlib.h> |
41 | #include <string.h> |
42 | |
43 | #include "serial.h" |
44 | |
45 | /*----- Main code ---------------------------------------------------------*/ |
46 | |
47 | /* --- @getbaud@ --- * |
48 | * |
49 | * Arguments: @const char *p@ = pointer to string |
50 | * @const char **pp@ = where to store final pointer |
51 | * |
52 | * Returns: Baud rate, or @-1@ on failure. |
53 | * |
54 | * Use: Parses a baud rate, either as a raw number or as an |
55 | * expression like `9k6'. |
56 | */ |
57 | |
58 | static long getbaud(const char *p, const char **pp) |
59 | { |
60 | long x = 0; |
61 | long f = 1, s = 10; |
62 | int ok = 0; |
63 | |
64 | /* --- Main loop --- */ |
65 | |
66 | for (;;) { |
67 | int ch = (unsigned char)*p; |
68 | |
69 | switch (ch) { |
70 | case 'k': |
71 | case 'K': |
72 | f = 1000; |
73 | goto factor; |
74 | case 'm': |
75 | case 'M': |
76 | f = 1000000; |
77 | goto factor; |
78 | factor: |
79 | if (ok != 1) |
80 | return (-1); |
81 | x *= f; |
82 | s = 1; |
83 | ok = 2; |
84 | break; |
85 | default: |
86 | if (!isdigit(ch)) |
87 | goto done; |
88 | if (!ok) |
89 | ok = 1; |
90 | if (ok == 2) { |
91 | if (f == 1) |
92 | return (-1); |
93 | f /= 10; |
94 | } |
95 | x = x * s + (ch - '0') * f; |
96 | break; |
97 | } |
98 | p++; |
99 | } |
100 | done: |
101 | if (!ok) |
102 | return (-1); |
103 | if (pp) |
104 | *pp = p; |
105 | return (x); |
106 | } |
107 | |
108 | /* --- @serial_parse@ --- * |
109 | * |
110 | * Arguments: @const char *p@ = configuration string to parse |
111 | * @serial_config *sc@ = pointer to serial config structure |
112 | * |
113 | * Returns: Zero if OK, or @-1@ on error. |
114 | * |
115 | * Use: Parses a serial config string into something more |
116 | * reasonable. The config structure should have been |
117 | * initialized to something sensible (e.g., @SERIAL_INIT@) |
118 | * already. |
119 | */ |
120 | |
121 | int serial_parse(const char *p, serial_config *sc) |
122 | { |
123 | long x; |
124 | const char *q; |
125 | char *qq; |
126 | |
127 | /* --- Pick out an initial baud rate --- */ |
128 | |
129 | while (isspace((unsigned char)*p)) |
130 | p++; |
131 | if (*p != 0 && *p != ':') { |
132 | if ((x = getbaud(p, &p)) < 0) |
133 | goto fail; |
134 | sc->baud = x; |
135 | } |
136 | while (isspace((unsigned char)*p)) |
137 | p++; |
138 | if (*p == ':') |
139 | p++; |
140 | |
141 | /* --- Pick out a word length --- */ |
142 | |
143 | while (isspace((unsigned char)*p)) |
144 | p++; |
145 | if ((x = strtol(p, &qq, 10)) == 0) |
146 | goto fail; |
147 | p = qq; |
148 | sc->wordlen = x; |
149 | while (isspace((unsigned char)*p)) |
150 | p++; |
151 | if (*p == '-') |
152 | p++; |
153 | |
154 | /* --- Pick out a parity designation --- */ |
155 | |
156 | while (isspace((unsigned char)*p)) |
157 | p++; |
158 | for (q = p; isalpha((unsigned char)*q); q++) |
159 | ; |
160 | if (q == p) |
161 | goto fail; |
162 | if (strncmp(p, "none", q - p) == 0) |
163 | sc->parity = PARITY_NONE; |
164 | else if (strncmp(p, "odd", q - p) == 0) |
165 | sc->parity = PARITY_ODD; |
166 | else if (strncmp(p, "even", q - p) == 0) |
167 | sc->parity = PARITY_EVEN; |
168 | else |
169 | goto fail; |
170 | p = q; |
171 | while (isspace((unsigned char)*p)) |
172 | p++; |
173 | if (*p == '-') |
174 | p++; |
175 | |
176 | /* --- Pick out a number of stop bits --- */ |
177 | |
178 | while (isspace((unsigned char)*p)) |
179 | p++; |
180 | if ((x = strtol(p, &qq, 10)) == 0) |
181 | goto fail; |
182 | p = qq; |
183 | sc->stopbits = x; |
184 | while (isspace((unsigned char)*p)) |
185 | p++; |
186 | |
187 | /* --- Done --- */ |
188 | |
189 | if (*p) |
190 | goto fail; |
191 | return (0); |
192 | |
193 | fail: |
194 | return (-1); |
195 | } |
196 | |
197 | /*----- Test rig ----------------------------------------------------------*/ |
198 | |
199 | #ifdef TEST_RIG |
200 | |
201 | #include <stdio.h> |
202 | |
203 | int main(int argc, char *argv[]) |
204 | { |
205 | int i; |
206 | static const char *ptab[] = { "none", "odd", "even" }; |
207 | |
208 | for (i = 1; i < argc; i++) { |
209 | serial_config sc = SERIAL_INIT; |
210 | |
211 | if (serial_parse(argv[i], &sc)) |
212 | printf("invalid serial configuration `%s'\n", argv[i]); |
213 | else { |
214 | printf("%lu %u-%s-%u\n", sc.baud, sc.wordlen, |
215 | ptab[sc.parity], sc.stopbits); |
216 | } |
217 | } |
218 | return (0); |
219 | } |
220 | |
221 | #endif |
222 | |
223 | /*----- That's all, folks -------------------------------------------------*/ |