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sftp_read: extend and clarify the documentation

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Daniel Stenberg
2011-09-08 23:02:58 +02:00
parent 10b66cef08
commit ff40c58743
1 changed files with 9 additions and 4 deletions
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13
src/sftp.c
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@@ -1120,9 +1120,15 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
count = max_read_ahead - already; count = max_read_ahead - already;
/* 'count' is how much more data to ask for, and 'already' is how much /* 'count' is how much more data to ask for, and 'already' is how much
data that already has been asked for but not yet returned. So, if data that already has been asked for but not yet returned.
'already' is very large it should be perfectly fine to have count Specificly, 'count' means how much data that have or will be asked
set to 0 as then we don't have to ask for more data (right now). for by the nodes that are already added to the linked list. Some of
those read requests may not actually have been sent off
successfully yet.
If 'already' is very large it should be perfectly fine to have
count set to 0 as then we don't have to ask for more data (right
now).
buffer_size*4 is just picked more or less out of the air. The idea buffer_size*4 is just picked more or less out of the air. The idea
is that when reading SFTP from a remote server, we send away is that when reading SFTP from a remote server, we send away
@@ -1131,7 +1137,6 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
buffer_size*4 amount of data so that we can return them very fast buffer_size*4 amount of data so that we can return them very fast
in subsequent calls. in subsequent calls.
*/ */
} }
while(count > 0) { while(count > 0) {