The from filter performs a traditional UNIX processing of lines starting with a From followed by a space character.
- Encode mode
- In encode mode, each "From " at the beginning of a line is replaced by ">From "
- Decode mode
- In decode mode, the reverse operation is performed: initial greater-then sign (>) is removed from any line starting with ">From ".
The following code creates an instance of read-only from stream which adds the greater-than character to each ">From " at the beginning of a line (the mu_stream_t input is supposed to have been initialized previously):
int rc; /* Return code */ mu_stream_t flt; /* Filter stream */ rc = mu_filter_create (&flt, input, "from", MU_FILTER_ENCODE, MU_STREAM_READ);
The object describing this filter is declared in mailutils/filter.h as follows:
extern mu_filter_record_t mu_from_filter;