Sequentially read a message from disk.

format

int POPSTORE_message_read (message_context, buffer, buffer_len, bytes_read) int message_context; char *buffer; int buffer_len; int *bytes_read;

Arguments

message_context

Message context returned by a previous call to POPSTORE_message_begin . Used for input only.

buffer

Pointer to a buffer into which to read message data. Used for output only.

buffer_len

Maximum length in bytes of the buffer. Used for input only.

bytes_read

On output, the number of bytes read and stored in the buffer. Used for output only.

Description

A message accessed with a call to POPSTORE_message_begin can be sequentially read with POPSTORE_message_read . POPSTORE_message_read will read up to buflen-1 bytes of data, storing them in the buffer pointed at by buffer and terminating the data with a null. POPSTORE_message_read should be repeatedly called until either POPSTORE_EOM or an error is returned. Note that when POPSTORE_EOM is returned, data can also have been returned as indicated by a non-zero value for bytes_read . Note that the data returned by POPSTORE_message_read will have embedded CRLF pairs marking the end of message records. Moreover, the data will be "dot stuffed" as per the POP protocol. An example of using POPSTORE_message_read is given in Example 12-8.

Return Values

POPSTORE_SUCCESS	Normal, successful completion.
POPSTORE_EOM	End of message reached; normal, successful completion.
POPSTORE_READERROR	Error reading message file.