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Documented why bypassing the read/write buffer is only attempted if there is at least a full buffer worth of data to be read or written.

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obarthel
2023-09-14 09:52:21 +02:00
parent f5631d8bda
commit d37909e409
2 changed files with 10 additions and 8 deletions
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7
library/stdio_fwrite.c
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@ -183,7 +183,9 @@ fwrite(const void *ptr,size_t element_size,size_t count,FILE *stream)
file->iob_BufferWriteBytes += num_buffer_bytes;
/* Write the buffer to disk if it's full or contains a line feed. */
/* Write the buffer to disk if the buffer is full
* or contains a line feed.
*/
if ((lf != NULL || __iob_write_buffer_is_full(file)) && __flush_iob_write_buffer(file) < 0)
{
/* Abort with error. */
@ -237,7 +239,8 @@ fwrite(const void *ptr,size_t element_size,size_t count,FILE *stream)
{
/* If there is more data to be written than the write buffer will hold
* and the write buffer is empty anyway, then we'll bypass the write
* buffer entirely.
* buffer entirely. Note that we try to store a complete full buffer
* worth's of data, not just a few bytes.
*/
if (file->iob_BufferWriteBytes == 0 && total_size >= (size_t)file->iob_BufferSize)
{