sendmsg.c

/*
 *  sendmsg.c  --  send a message to a twin client
 *
 *  This program is placed in the public domain.
 *
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <Tw/Tw.h>
#include <Tw/Twerrno.h>
#include "version.h"

char *argv0;

void Usage(void) {
  fprintf(stderr,
          "Usage: %s [--msgport=]<MsgPort> [OPTIONS]\n"
          "Currently known options:\n"
          " -h, --help              display this help and exit\n"
          " -V, --version           output version information and exit\n"
          " --twin@<dpy>            set the server to contact (default is $TWDISPLAY)\n"
          " --control               send a msg_user_control message (default)\n"
          " --clientmsg             send a msg_user_clientmsg message\n"
          " [--code=]<Code>         set the message code (default is `open')\n"
          " [--data=]<Data>         set the message data\n"
          "Currently known codes for control messages are:\n"
          " quit (0), restart (1), open (2)\n",
          argv0);
}

void ShowVersion(void) {
  fputs("twsendmsg " TWIN_VERSION_STR "\n", stdout);
}

TW_DECL_MAGIC(sendmsg_magic);

int main(int argc, char *argv[]) {
  char *DisplayName = NULL, *MsgPortName = NULL, *CodeName = NULL, *Data = NULL;
  uldat DataLen = 0;
  udat Type = TW_MSG_USER_CONTROL, Code = TW_MSG_CONTROL_OPEN;
  tmsgport MsgPort;
  tmsg msg;
  uldat err;

  TwMergeHyphensArgv(argc, argv);

  argv0 = argv[0];

  if (argc == 2) {
    if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "-help")) {
      Usage();
      return 0;
    } else if (!strcmp(argv[1], "-V") || !strcmp(argv[1], "-version")) {
      ShowVersion();
      return 0;
    }
  }

  if (TwCheckMagic(sendmsg_magic))
    do {

      while (++argv, --argc) {
        if (!strncmp(*argv, "-msgport=", 9))
          MsgPortName = *argv + 9;
        else if (!strncmp(*argv, "-twin@", 6))
          DisplayName = *argv + 6;
        else if (!strcmp(*argv, "-control"))
          Type = TW_MSG_USER_CONTROL;
        else if (!strcmp(*argv, "-clientmsg"))
          Type = TW_MSG_USER_CLIENTMSG;
        else if (!strncmp(*argv, "-code=", 6))
          CodeName = *argv + 6;
        else if (!strncmp(*argv, "-data=", 6))
          Data = *argv + 6;
        else if (!MsgPortName)
          MsgPortName = *argv;
        else if (!CodeName)
          CodeName = *argv;
        else if (!Data)
          Data = *argv;
      }

      if (CodeName) {
        if (!strcmp(CodeName, "quit"))
          Code = TW_MSG_CONTROL_QUIT;
        else if (!strcmp(CodeName, "restart"))
          Code = TW_MSG_CONTROL_RESTART;
        else if (!strcmp(CodeName, "open"))
          Code = TW_MSG_CONTROL_OPEN;
        else {
          fprintf(stderr,
                  "%s: argument `%s' not recognized\n"
                  "\ttry `%s --help' for usage summary.\n",
                  argv0, CodeName, argv0);
          return 1;
        }
      }

      if (Data)
        DataLen = strlen(Data);

      if (!TwOpen(DisplayName))
        break;

      if (MsgPortName) {
        if ((MsgPort = TwFindMsgPort(TW_NOID, strlen(MsgPortName), MsgPortName))) {
          if (Type == TW_MSG_USER_CONTROL) {
            if ((msg = TwCreateMsg(TW_MSG_USER_CONTROL, DataLen + TW_SIZEOF_TEVENT_CONTROL))) {
              tevent_control EventC = &msg->Event.EventControl;
              EventC->W = TW_NOID;
              EventC->Code = Code;
              EventC->Len = DataLen;
              EventC->X = 0;
              EventC->Y = 0;
              if (DataLen)
                memcpy(EventC->Data, Data, DataLen);
              if (TwSendMsg(MsgPort, msg))
                return 0;
            }
          } else {
            if ((msg = TwCreateMsg(TW_MSG_USER_CLIENTMSG, DataLen + TW_SIZEOF_TEVENT_CLIENTMSG))) {
              tevent_clientmsg EventC = &msg->Event.EventClientMsg;
              EventC->W = TW_NOID;
              EventC->Code = Code;
              EventC->Len = DataLen;
              if (DataLen)
                memcpy(EventC->Data.b, Data, DataLen);
              if (TwSendMsg(MsgPort, msg))
                return 0;
            }
          }
        } else {
          fprintf(stderr, "%s: MsgPort `%s' not found on server.\n", argv0, MsgPortName);
          return 1;
        }
      } else {
        Usage();
        return 1;
      }

    } while (0);

  err = TwErrno;
  fprintf(stderr, "%s: libtw error: %s%s\n", argv0, TwStrError(err),
          TwStrErrorDetail(err, TwErrnoDetail));
  return 1;
}