/*
* Input to be processed is collected in a Client specific buffer. It
* is filled by reading information from a stream, a terminal, or by
* scheduling strings constructed internally. The latter involves
* removing any escape character needed to manipulate the string within
* the kernel. The buffer space is automatically expanded to
* accommodate new information and the read pointers are adjusted.
*
* The input is read from a (blocked) stream and stored in the client
* record input buffer. The storage area grows automatically upon need.
* The origin of the input stream depends on the connectivity mode.
*
* Each operation received from a front-end consists of at least one
* line. To simplify misaligned communication with front-ends, we use
* different prompts structures.
*
* The default action is to read information from an ascii-stream one
* line at a time. This is the preferred mode for reading from terminal.
*
* The next statement block is to be read. Send a prompt to warn the
* front-end to issue the request.
*/
int
MCreadClient(Client c)
{
bstream *in = c->fdin;
#ifdef MAL_CLIENT_DEBUG
printf("# streamClient %d %d\n", c->idx, isa_block_stream(in->s));
#endif
while (in->pos < in->len &&
(isspace((int) (in->buf[in->pos])) ||
in->buf[in->pos] == ';' || !in->buf[in->pos]))
in->pos++;
if (in->pos >= in->len || in->mode) {
ssize_t rd, sum = 0;
if (in->eof || !isa_block_stream(c->fdout)) {
if (!isa_block_stream(c->fdout) && c->promptlength > 0)
mnstr_write(c->fdout, c->prompt, c->promptlength, 1);
mnstr_flush(c->fdout);
in->eof = 0;
}
while ((rd = bstream_next(in)) > 0 && !in->eof) {
sum += rd;
if (!in->mode) /* read one line at a time in line mode */
break;
}
if (in->mode) { /* find last new line */
char *p = in->buf + in->len - 1;
while (p > in->buf && *p != '\n') {
*(p + 1) = *p;
p--;
}
if (p > in->buf)
*(p + 1) = 0;
if (p != in->buf + in->len - 1)
in->len++;
}
if (sum == 0 && in->eof && isa_block_stream(in->s)) {
/* we hadn't seen the EOF before, so just try again
(this time with prompt) */
#ifdef MAL_CLIENT_DEBUG
printf("# retry stream reading %d %d\n", c->idx, in->eof);
#endif
return MCreadClient(c);
}
#ifdef MAL_CLIENT_DEBUG
printf("# simple stream received %d sum " SZFMT "\n", c->idx, sum);
#endif
}
if (in->pos >= in->len) {
/* end of stream reached */
#ifdef MAL_CLIENT_DEBUG
printf("# end of stream received %d %d\n", c->idx, c->bak == 0);
#endif
if (c->bak) {
MCpopClientInput(c);
if (c->fdin == NULL)
return 0;
return MCreadClient(c);
}
return 0;
}
if (*CURRENT(c) == '?') {
showHelp(c->nspace, CURRENT(c) + 1, c->fdout);
in->pos = in->len;
return MCreadClient(c);
}
#ifdef MAL_CLIENT_DEBUG
printf("# finished stream read %d %d\n", (int) in->pos, (int) in->len);
printf("#%s\n", in->buf);
#endif
return 1;
}
/*
* Input to be processed is collected in a Client specific buffer. It
* is filled by reading information from a stream, a terminal, or by
* scheduling strings constructed internally. The latter involves
* removing any escape character needed to manipulate the string within
* the kernel. The buffer space is automatically expanded to
* accommodate new information and the read pointers are adjusted.
*
* The input is read from a (blocked) stream and stored in the client
* record input buffer. The storage area grows automatically upon need.
* The origin of the input stream depends on the connectivity mode.
*
* Each operation received from a front-end consists of at least one
* line. To simplify misaligned communication with front-ends, we use
* different prompts structures.
*
* The default action is to read information from an ascii-stream one
* line at a time. This is the preferred mode for reading from terminal.
*
* The next statement block is to be read. Send a prompt to warn the
* front-end to issue the request.
*/
int
MCreadClient(Client c)
{
bstream *in = c->fdin;
#ifdef MAL_CLIENT_DEBUG
fprintf(stderr,"# streamClient %d %d\n", c->idx, isa_block_stream(in->s));
#endif
while (in->pos < in->len &&
(isspace((unsigned char) (in->buf[in->pos])) ||
in->buf[in->pos] == ';' || !in->buf[in->pos]))
in->pos++;
if (in->pos >= in->len || in->mode) {
ssize_t rd, sum = 0;
if (in->eof || !isa_block_stream(c->fdout)) {
if (!isa_block_stream(c->fdout) && c->promptlength > 0)
mnstr_write(c->fdout, c->prompt, c->promptlength, 1);
mnstr_flush(c->fdout);
in->eof = false;
}
while ((rd = bstream_next(in)) > 0 && !in->eof) {
sum += rd;
if (!in->mode) /* read one line at a time in line mode */
break;
}
if (in->mode) { /* find last new line */
char *p = in->buf + in->len - 1;
while (p > in->buf && *p != '\n') {
*(p + 1) = *p;
p--;
}
if (p > in->buf)
*(p + 1) = 0;
if (p != in->buf + in->len - 1)
in->len++;
}
#ifdef MAL_CLIENT_DEBUG
fprintf(stderr, "# simple stream received %d sum %zu\n", c->idx, sum);
#endif
}
if (in->pos >= in->len) {
/* end of stream reached */
#ifdef MAL_CLIENT_DEBUG
fprintf(stderr,"# end of stream received %d %d\n", c->idx, c->bak == 0);
#endif
if (c->bak) {
MCpopClientInput(c);
if (c->fdin == NULL)
return 0;
return MCreadClient(c);
}
return 0;
}
#ifdef MAL_CLIENT_DEBUG
fprintf(stderr,"# finished stream read %d %d\n", (int) in->pos, (int) in->len);
printf("#%s\n", in->buf);
#endif
return 1;
}