int read_from_pipe(request * req)
{
int bytes_read, bytes_to_read =
BUFFER_SIZE - (req->header_end - req->buffer);
if (bytes_to_read == 0) { /* buffer full */
if (req->cgi_status == CGI_PARSE) { /* got+parsed header */
req->cgi_status = CGI_BUFFER;
*req->header_end = '\0'; /* points to end of read data */
/* Could the above statement overwrite data???
No, because req->header_end points to where new data
should begin, not where old data is.
*/
return process_cgi_header(req); /* cgi_status will change */
}
req->status = PIPE_WRITE;
return 1;
}
bytes_read = read(req->data_fd, req->header_end, bytes_to_read);
if (bytes_read == -1) {
if (errno == EINTR)
return 1;
else if (errno == EWOULDBLOCK || errno == EAGAIN)
return -1; /* request blocked at the pipe level, but keep going */
else {
req->status = DEAD;
log_error_doc(req);
perror("pipe read");
return 0;
}
} else if (bytes_read == 0) { /* eof, write rest of buffer */
req->status = PIPE_WRITE;
if (req->cgi_status == CGI_PARSE) { /* hasn't processed header yet */
req->cgi_status = CGI_DONE;
*req->header_end = '\0'; /* points to end of read data */
return process_cgi_header(req); /* cgi_status will change */
}
req->cgi_status = CGI_DONE;
return 1;
}
req->header_end += bytes_read;
return 1;
}
int read_from_pipe(request * req)
{
off_t bytes_read; /* signed */
off_t bytes_to_read; /* unsigned */ /* XXX really? */
bytes_to_read = BUFFER_SIZE - (req->header_end - req->buffer - 1);
if (bytes_to_read == 0) { /* buffer full */
if (req->cgi_status == CGI_PARSE) { /* got+parsed header */
req->cgi_status = CGI_BUFFER;
*req->header_end = '\0'; /* points to end of read data */
/* Could the above statement overwrite data???
No, because req->header_end points to where new data
should begin, not where old data is.
*/
return process_cgi_header(req); /* cgi_status will change */
}
req->status = PIPE_WRITE;
return 1;
}
bytes_read = read(req->data_fd, req->header_end, bytes_to_read);
#ifdef FASCIST_LOGGING
if (bytes_read > 0) {
*(req->header_end + bytes_read) = '\0';
fprintf(stderr, "pipe.c - read %d bytes: \"%s\"\n",
bytes_read, req->header_end);
} else
fprintf(stderr, "pipe.c - read %d bytes\n", bytes_read);
fprintf(stderr, "status, cgi_status: %d, %d\n", req->status,
req->cgi_status);
#endif
if (bytes_read == -1) {
if (errno == EINTR)
return 1;
else if (errno == EWOULDBLOCK || errno == EAGAIN)
return -1; /* request blocked at the pipe level, but keep going */
else {
req->status = DEAD;
log_error_doc(req);
perror("pipe read");
return 0;
}
}
*(req->header_end + bytes_read) = '\0';
if (bytes_read == 0) { /* eof, write rest of buffer */
req->status = PIPE_WRITE;
if (req->cgi_status == CGI_PARSE) { /* hasn't processed header yet */
req->cgi_status = CGI_DONE;
*req->header_end = '\0'; /* points to end of read data */
return process_cgi_header(req); /* cgi_status will change */
}
req->cgi_status = CGI_DONE;
return 1;
}
req->header_end += bytes_read;
if (req->cgi_status != CGI_PARSE)
return write_from_pipe(req); /* why not try and flush the buffer now? */
else {
char *c, *buf;
buf = req->header_line;
c = strstr(buf, "\n\r\n");
if (c == NULL) {
c = strstr(buf, "\n\n");
if (c == NULL) {
return 1;
}
}
req->cgi_status = CGI_DONE;
*req->header_end = '\0'; /* points to end of read data */
return process_cgi_header(req); /* cgi_status will change */
}
return 1;
}