[Caml-list] Reading into a string from C code

[Richard Jones <rich@annexia.org>]

This is my wrapper around the Apache ap_get_client_block call:

CAMLprim value
mod_caml_request_get_client_block (value rv, value str)
{
  CAMLparam2 (rv, str);
  request_rec *r = Request_rec_val (rv);
  int n = string_length (str);
  char *buffer = String_val (str);
  int i = ap_get_client_block (r, buffer, n);
  if (i == -1) raise_http_error (HTTP_INTERNAL_SERVER_ERROR);
  CAMLreturn (Val_int (i));
}

ap_get_client_block is prototyped as:

long ap_get_client_block (request_rec *, char *buffer, int buffer_size);

Its job is to read up to buffer_size bytes into buffer and return the
number of bytes actually written into this buffer.

Is my wrapper correct?  Can I call String_val (str) and then write
into that buffer in order to write into the string?  I suspect not,
actually, since although it works most of the time, I seem to be
getting some data corruption errors occasionally.

Rich.

-- 
Richard Jones. http://www.annexia.org/ http://www.j-london.com/
Merjis Ltd. http://www.merjis.com/ - improving website return on investment
C2LIB is a library of basic Perl/STL-like types for C. Vectors, hashes,
trees, string funcs, pool allocator: http://www.annexia.org/freeware/c2lib/

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