| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: serial.c,v 1.2 2002/01/30 09:23:58 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 | /*----- Header files ------------------------------------------------------*/ |
| 30 | |
| 31 | #include <ctype.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "serial.h" |
| 36 | |
| 37 | /*----- Main code ---------------------------------------------------------*/ |
| 38 | |
| 39 | /* --- @getbaud@ --- * |
| 40 | * |
| 41 | * Arguments: @const char *p@ = pointer to string |
| 42 | * @const char **pp@ = where to store final pointer |
| 43 | * |
| 44 | * Returns: Baud rate, or @-1@ on failure. |
| 45 | * |
| 46 | * Use: Parses a baud rate, either as a raw number or as an |
| 47 | * expression like `9k6'. |
| 48 | */ |
| 49 | |
| 50 | static long getbaud(const char *p, const char **pp) |
| 51 | { |
| 52 | long x = 0; |
| 53 | long f = 1, s = 10; |
| 54 | int ok = 0; |
| 55 | |
| 56 | /* --- Main loop --- */ |
| 57 | |
| 58 | for (;;) { |
| 59 | int ch = (unsigned char)*p; |
| 60 | |
| 61 | switch (ch) { |
| 62 | case 'k': |
| 63 | case 'K': |
| 64 | f = 1000; |
| 65 | goto factor; |
| 66 | case 'm': |
| 67 | case 'M': |
| 68 | f = 1000000; |
| 69 | goto factor; |
| 70 | factor: |
| 71 | if (ok != 1) |
| 72 | return (-1); |
| 73 | x *= f; |
| 74 | s = 1; |
| 75 | ok = 2; |
| 76 | break; |
| 77 | default: |
| 78 | if (!isdigit(ch)) |
| 79 | goto done; |
| 80 | if (!ok) |
| 81 | ok = 1; |
| 82 | if (ok == 2) { |
| 83 | if (f == 1) |
| 84 | return (-1); |
| 85 | f /= 10; |
| 86 | } |
| 87 | x = x * s + (ch - '0') * f; |
| 88 | break; |
| 89 | } |
| 90 | p++; |
| 91 | } |
| 92 | done: |
| 93 | if (!ok) |
| 94 | return (-1); |
| 95 | if (pp) |
| 96 | *pp = p; |
| 97 | return (x); |
| 98 | } |
| 99 | |
| 100 | /* --- @getparity@ --- * |
| 101 | * |
| 102 | * Arguments: @const char *p@ = pointer to string |
| 103 | * @const char **pp@ = where to store final pointer |
| 104 | * |
| 105 | * Returns: Parity constant or @-1@ on error. |
| 106 | * |
| 107 | * Use: Parses a parity setting. |
| 108 | */ |
| 109 | |
| 110 | static int getparity(const char *p, const char **pp) |
| 111 | { |
| 112 | const char *q; |
| 113 | |
| 114 | for (q = p; isalpha((unsigned char)*q); q++) |
| 115 | ; |
| 116 | if (q == p) |
| 117 | return (-1); |
| 118 | if (pp) |
| 119 | *pp = q; |
| 120 | if (strncmp(p, "none", q - p) == 0) |
| 121 | return (PARITY_NONE); |
| 122 | else if (strncmp(p, "odd", q - p) == 0) |
| 123 | return (PARITY_ODD); |
| 124 | else if (strncmp(p, "even", q - p) == 0) |
| 125 | return (PARITY_EVEN); |
| 126 | else |
| 127 | return (-1); |
| 128 | } |
| 129 | |
| 130 | /* --- @getflow@ --- * |
| 131 | * |
| 132 | * Arguments: @const char *p@ = pointer to string |
| 133 | * @const char **pp@ = where to store final pointer |
| 134 | * |
| 135 | * Returns: Flow control constant or @-1@ on error. |
| 136 | * |
| 137 | * Use: Parses a flow control setting. |
| 138 | */ |
| 139 | |
| 140 | static int getflow(const char *p, const char **pp) |
| 141 | { |
| 142 | const char *q; |
| 143 | |
| 144 | for (q = p; isalpha((unsigned char)*q); q++) |
| 145 | ; |
| 146 | if (q == p) |
| 147 | return (-1); |
| 148 | if (pp) |
| 149 | *pp = q; |
| 150 | if (strncmp(p, "none", q - p) == 0) |
| 151 | return (FLOW_NONE); |
| 152 | else if (strncmp(p, "soft", q - p) == 0 || |
| 153 | strncmp(p, "xon-xoff", q - p) == 0 || |
| 154 | strncmp(p, "xon/xoff", q - p) == 0 || |
| 155 | strncmp(p, "xonxoff", q - p) == 0) |
| 156 | return (FLOW_XONXOFF); |
| 157 | else if (strncmp(p, "hard", q - p) == 0 || |
| 158 | strncmp(p, "cts-rts", q - p) == 0 || |
| 159 | strncmp(p, "cts/rts", q - p) == 0 || |
| 160 | strncmp(p, "ctsrts", q - p) == 0 || |
| 161 | strncmp(p, "rts/cts", q - p) == 0 || |
| 162 | strncmp(p, "rts-cts", q - p) == 0 || |
| 163 | strncmp(p, "rtscts", q - p) == 0) |
| 164 | return (FLOW_RTSCTS); |
| 165 | else |
| 166 | return (-1); |
| 167 | } |
| 168 | |
| 169 | /* --- @serial_parse@ --- * |
| 170 | * |
| 171 | * Arguments: @serial_config *sc@ = pointer to serial config structure |
| 172 | * @const char *k, *v@ = keyword and value pair |
| 173 | * |
| 174 | * Returns: Zero if OK, or @-1@ on error. |
| 175 | * |
| 176 | * Use: Parses a serial config string into something more |
| 177 | * reasonable. The config structure should have been |
| 178 | * initialized to something sensible (e.g., @SERIAL_INIT@) |
| 179 | * already. |
| 180 | */ |
| 181 | |
| 182 | int serial_parse(serial_config *sc, const char *k, const char *v) |
| 183 | { |
| 184 | long x; |
| 185 | const char *q; |
| 186 | char *qq; |
| 187 | |
| 188 | if (strcmp(k, "baud") == 0 || strcmp(k, "bps") == 0) { |
| 189 | if (!v || (x = getbaud(v, &q)) < 0 || *q) |
| 190 | return (-1); |
| 191 | sc->baud = x; |
| 192 | } else if (strcmp(k, "data") == 0 || strcmp(k, "data-bits") == 0 || |
| 193 | strcmp(k, "databits") == 0 || strcmp(k, "data-len") == 0 || |
| 194 | strcmp(k, "datalen") == 0 || strcmp(k, "word") == 0 || |
| 195 | strcmp(k, "word-len") == 0 || strcmp(k, "wordlen") == 0) { |
| 196 | if (!v || (x = strtol(v, &qq, 10)) == 0 || *qq) |
| 197 | return (-1); |
| 198 | sc->wordlen = x; |
| 199 | } else if (strcmp(k, "parity") == 0) { |
| 200 | if (!v || (x = getparity(v, &q)) < 0 || *q) |
| 201 | return (-1); |
| 202 | sc->parity = x; |
| 203 | } else if (strcmp(k, "stop") == 0 || strcmp(k, "stop-bits") == 0 || |
| 204 | strcmp(k, "stopbits") == 0) { |
| 205 | if (!v || (x = strtol(v, &qq, 10)) == 0 || *qq) |
| 206 | return (-1); |
| 207 | sc->stopbits = x; |
| 208 | } else if (strcmp(k, "flow") == 0 || strcmp(k, "flow-control") == 0 || |
| 209 | strcmp(k, "flowcontrol") == 0) { |
| 210 | if (!v || (x = getflow(v, &q)) < 0 || *q) |
| 211 | return (-1); |
| 212 | sc->flow = x; |
| 213 | } else if (strcmp(k, "format") == 0) { |
| 214 | if (!v) |
| 215 | return (-1); |
| 216 | if ((x = strtol(v, &qq, 10)) == 0) |
| 217 | return (-1); |
| 218 | v = qq; |
| 219 | sc->wordlen = x; |
| 220 | if (*v == '-') |
| 221 | v++; |
| 222 | if ((x = getparity(v, &q)) < 0) |
| 223 | return (-1); |
| 224 | sc->parity = x; |
| 225 | v = q; |
| 226 | if (*v == '-') |
| 227 | v++; |
| 228 | if ((x = strtol(v, &qq, 10)) == 0) |
| 229 | return (-1); |
| 230 | v = qq; |
| 231 | sc->stopbits = x; |
| 232 | if (*v) |
| 233 | return (-1); |
| 234 | } else |
| 235 | return (-1); |
| 236 | |
| 237 | return (0); |
| 238 | } |
| 239 | |
| 240 | /*----- Test rig ----------------------------------------------------------*/ |
| 241 | |
| 242 | #ifdef TEST_RIG |
| 243 | |
| 244 | #include <stdio.h> |
| 245 | #include <string.h> |
| 246 | |
| 247 | int main(int argc, char *argv[]) |
| 248 | { |
| 249 | int i; |
| 250 | static const char *ptab[] = { "none", "odd", "even" }; |
| 251 | static const char *ftab[] = { "none", "xon/xoff", "rts/cts" }; |
| 252 | |
| 253 | for (i = 1; i < argc; i++) { |
| 254 | serial_config sc = SERIAL_INIT; |
| 255 | char *k, *v; |
| 256 | |
| 257 | for (k = strtok(argv[i], ";"); k; k = strtok(0, ";")) { |
| 258 | if ((v = strchr(k, '=')) != 0) |
| 259 | *v++ = 0; |
| 260 | if (serial_parse(&sc, k, v)) { |
| 261 | printf("invalid serial configuration `%s=%s'\n", k, v); |
| 262 | goto next; |
| 263 | } |
| 264 | } |
| 265 | printf("%lu %u-%s-%u %s\n", sc.baud, sc.wordlen, |
| 266 | ptab[sc.parity], sc.stopbits, ftab[sc.flow]); |
| 267 | next:; |
| 268 | } |
| 269 | return (0); |
| 270 | } |
| 271 | |
| 272 | #endif |
| 273 | |
| 274 | /*----- That's all, folks -------------------------------------------------*/ |