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   1 /*
   2  * Copyright © 2008 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include "s51.h"
  20 #include <unistd.h>
  21 #include <sys/types.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <signal.h>
  25 #include <stdarg.h>
  26 #include <poll.h>
  27
  28 static int s51_port = 0;
  29 static char *cpu = "8051";
  30 static double freq = 11059200;
  31 char *s51_prompt = "> ";
  32 struct ccdbg *s51_dbg;
  33 int s51_interrupted = 0;
  34 int s51_monitor = 0;
  35
  36 static FILE *s51_input;
  37 static FILE *s51_output;
  38
  39 static void
  40 usage(void)
  41 {
  42         fprintf(stderr, "You're doing it wrong.\n");
  43         exit(1);
  44 }
  45
  46 void s51_sigint()
  47 {
  48         s51_interrupted = 1;
  49 }
  50
  51 int
  52 main(int argc, char **argv)
  53 {
  54         int flags, opt;
  55         char *endptr;
  56         struct sigvec vec, ovec;
  57
  58         while ((opt = getopt(argc, argv, "PVvHhmt:X:c:r:Z:s:S:p:")) != -1) {
  59                 switch (opt) {
  60                 case 't':
  61                         cpu = optarg;
  62                         break;
  63                 case 'X':
  64                         freq = strtod(optarg, &endptr);
  65                         if (endptr == optarg)
  66                                 usage();
  67                         if (endptr[0] != '\0') {
  68                                 if (!strcmp(endptr, "k"))
  69                                         freq *= 1000;
  70                                 else if (!strcmp(endptr, "M") )
  71                                         freq *= 1000000;
  72                                 else
  73                                         usage ();
  74                         }
  75                         break;
  76                 case 'c':
  77                         break;
  78                 case 'r':
  79                 case 'Z':
  80                         s51_port = strtol(optarg, &endptr, 0);
  81                         if (endptr == optarg || strlen(endptr) != 0)
  82                                 usage();
  83                         break;
  84                 case 's':
  85                         break;
  86                 case 'S':
  87                         break;
  88                 case 'p':
  89                         s51_prompt = optarg;
  90                         break;
  91                 case 'P':
  92                         s51_prompt = NULL;
  93                         break;
  94                 case 'V':
  95                         break;
  96                 case 'v':
  97                         break;
  98                 case 'H':
  99                         exit (0);
 100                         break;
 101                 case 'h':
 102                         usage ();
 103                         break;
 104                 case 'm':
 105                         s51_monitor = 1;
 106                         break;
 107                 }
 108         }
 109         if (s51_port) {
 110                 int l, r, one = 1;
 111                 int s;
 112                 struct sockaddr_in in;
 113
 114                 l = socket(AF_INET, SOCK_STREAM, 0);
 115                 if (l < 0) {
 116                         perror ("socket");
 117                         exit(1);
 118                 }
 119                 r = setsockopt(l, SOL_SOCKET, SO_REUSEADDR, &one, sizeof (int));
 120                 if (r) {
 121                         perror("setsockopt");
 122                         exit(1);
 123                 }
 124                 in.sin_family = AF_INET;
 125                 in.sin_port = htons(s51_port);
 126                 in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 127                 r = bind(l, (struct sockaddr *) &in, sizeof (in));
 128                 if (r) {
 129                         perror("bind");
 130                         exit(1);
 131                 }
 132                 r = listen(l, 5);
 133                 if (r) {
 134                         perror("listen");
 135                         exit(1);
 136                 }
 137                 for (;;) {
 138                         struct sockaddr_in client_addr;
 139                         socklen_t client_len = sizeof (struct sockaddr_in);
 140
 141                         s = accept(l, (struct sockaddr *)
 142                                    &client_addr, &client_len);
 143                         if (s < 0) {
 144                                 perror("accept");
 145                                 exit(1);
 146                         }
 147                         s51_input = fdopen(s, "r");
 148                         s51_output = fdopen(s, "w");
 149                         if (!s51_input || !s51_output) {
 150                                 perror("fdopen");
 151                                 exit(1);
 152                         }
 153                         vec.sv_handler = s51_sigint;
 154                         vec.sv_mask = 0;
 155                         vec.sv_flags = 0;
 156                         sigvec(SIGINT, &vec, &ovec);
 157                         command_read();
 158                         sigvec(SIGINT, &ovec, NULL);
 159                         fclose(s51_input);
 160                         fclose(s51_output);
 161                 }
 162         } else {
 163                 s51_input = stdin;
 164                 s51_output = stdout;
 165                 vec.sv_handler = s51_sigint;
 166                 vec.sv_mask = 0;
 167                 vec.sv_flags = 0;
 168                 sigvec(SIGINT, &vec, &ovec);
 169                 command_read();
 170         }
 171         exit(0);
 172 }
 173
 174 void
 175 s51_printf(char *format, ...)
 176 {
 177         va_list ap;
 178
 179         va_start(ap, format);
 180         vfprintf(s51_output, format, ap);
 181         if (s51_monitor)
 182                 vfprintf(stdout, format, ap);
 183         va_end(ap);
 184 }
 185
 186 void
 187 s51_putc(int c)
 188 {
 189         putc(c, s51_output);
 190 }
 191
 192 int
 193 s51_read_line(char *line, int len)
 194 {
 195         int ret;
 196         if (s51_prompt)
 197                 s51_printf("%s", s51_prompt);
 198         else
 199                 s51_putc('\0');
 200         fflush(s51_output);
 201         ret = fgets(line, len, s51_input) != NULL;
 202         if (s51_monitor)
 203                 printf("> %s", line);
 204         fflush(stdout);
 205         return ret;
 206 }
 207
 208 int
 209 s51_check_input(void)
 210 {
 211         struct pollfd   input;
 212         int r;
 213         int c;
 214
 215         input.fd = fileno(s51_input);
 216         input.events = POLLIN;
 217         r = poll(&input, 1, 0);
 218         if (r > 0) {
 219                 char line[256];
 220                 (void) s51_read_line(line, sizeof (line));
 221                 return 1;
 222         }
 223         return 0;
 224 }
 225