1: /*

  3:     This is the equivalent of MATLAB's fread() only on sockets instead of
  4:    binary files.
  5: */

  7: #include <petscsys.h>
  8: #include <../src/sys/classes/viewer/impls/socket/socket.h>
  9: #include <mex.h>

 11: #define PETSC_MEX_ERROR(a) \
 12:   { \
 13:     fprintf(stdout, "sread: %s \n", a); \
 14:     return; \
 15:   }

 17: PETSC_EXTERN void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
 18: {
 19:   int            fd, cnt, dt;
 20:   PetscErrorCode ierr;

 22:   /* check output parameters */
 23:   if (nlhs != 1) PETSC_MEX_ERROR("Receive requires one output argument.");
 24:   if (nrhs != 3) PETSC_MEX_ERROR("Receive requires three input arguments.");
 25:   fd  = (int)mxGetScalar(prhs[0]);
 26:   cnt = (int)mxGetScalar(prhs[1]);
 27:   dt  = (PetscDataType)mxGetScalar(prhs[2]);

 29:   if (dt == PETSC_DOUBLE) {
 30:     plhs[0] = mxCreateDoubleMatrix(1, cnt, mxREAL);
 31:     ierr    = PetscBinaryRead(fd, mxGetPr(plhs[0]), cnt, NULL, (PetscDataType)dt);
 32:     if (ierr) PETSC_MEX_ERROR("Unable to receive double items.");
 33:   } else if (dt == PETSC_INT) {
 34:     plhs[0] = mxCreateNumericMatrix(1, cnt, mxINT32_CLASS, mxREAL);
 35:     ierr    = PetscBinaryRead(fd, mxGetPr(plhs[0]), cnt, NULL, (PetscDataType)dt);
 36:     if (ierr) PETSC_MEX_ERROR("Unable to receive int items.");
 37:   } else if (dt == PETSC_CHAR) {
 38:     char *tmp = (char *)mxMalloc(cnt * sizeof(char));
 39:     ierr      = PetscBinaryRead(fd, tmp, cnt, NULL, (PetscDataType)dt);
 40:     if (ierr) PETSC_MEX_ERROR("Unable to receive char items.");
 41:     plhs[0] = mxCreateStringFromNChars(tmp, cnt);
 42:     mxFree(tmp);
 43:   } else PETSC_MEX_ERROR("Unknown datatype.");
 44:   return;
 45: }

 47: int main(int argc, char **argv)
 48: {
 49:   return 0;
 50: }