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Allow port "write" functions to only write a chunk

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* libguile/ports.c (scm_i_write_bytes_unlocked): Allow incomplete
  writes from the implementation.
  (scm_c_write_bytes_unlocked): Use scm_i_write_bytes_unlocked helper to
  call the write function.
* libguile/r6rs-ports.c (custom_binary_output_port_write): Don't loop;
  core Guile will do that.
This commit is contained in:
Andy Wingo 2016-04-12 16:45:10 +02:00
parent d83140890f
commit a9cf9f424f
2 changed files with 14 additions and 27 deletions
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12
libguile/ports.c
View file

@ -2614,15 +2614,16 @@ scm_puts (const char *s, SCM port)
static void
scm_i_write_bytes_unlocked (SCM port, SCM src, size_t start, size_t count)
{
size_t written;
size_t written = 0;
scm_t_ptob_descriptor *ptob = SCM_PORT_DESCRIPTOR (port);
assert (count <= SCM_BYTEVECTOR_LENGTH (src));
assert (start + count <= SCM_BYTEVECTOR_LENGTH (src));
written = ptob->write (port, src, start, count);
do
written += ptob->write (port, src, start + written, count - written);
while (written < count);
/* FIXME: Allow short writes? */
assert (written == count);
}
@ -2697,13 +2698,10 @@ scm_c_write_bytes_unlocked (SCM port, SCM src, size_t start, size_t count)
{
/* Our write would overflow the buffer. Flush buffered bytes (if
needed), then write our bytes with just one syscall. */
size_t written;
if (write_buf->cur < write_buf->end)
scm_i_write_unlocked (port, write_buf);
written = SCM_PORT_DESCRIPTOR (port)->write (port, src, start, count);
assert (written == count);
scm_i_write_bytes_unlocked (port, src, start, count);
}
return count;

29
libguile/r6rs-ports.c
View file

@ -887,29 +887,18 @@ static size_t
custom_binary_output_port_write (SCM port, SCM src, size_t start, size_t count)
#define FUNC_NAME "custom_binary_output_port_write"
{
size_t written;
struct custom_binary_port *stream = (void *) SCM_STREAM (port);
size_t written;
SCM result;
/* Since the `write' procedure of Guile's ports has type `void', it must
try hard to write exactly SIZE bytes, regardless of how many bytes the
sink can handle. */
written = 0;
while (written < count)
{
long int c_result;
SCM result;
result = scm_call_3 (stream->write, src, scm_from_size_t (start),
scm_from_size_t (count));
result = scm_call_3 (stream->write, src,
scm_from_size_t (start + written),
scm_from_size_t (count - written));
c_result = scm_to_long (result);
if (c_result < 0 || (size_t) c_result > (count - written))
scm_wrong_type_arg_msg (FUNC_NAME, 0, result,
"R6RS custom binary output port `write!' "
"returned a incorrect integer");
written += c_result;
}
written = scm_to_size_t (result);
if (written > count)
scm_wrong_type_arg_msg (FUNC_NAME, 0, result,
"R6RS custom binary output port `write!' "
"returned a incorrect integer");
return written;
}