buffer_puterror2(3)
write error string to buffer and flush
SYNTAX
#include <buffer.h>
int buffer_puterror2(buffer* b,int errnum);
DESCRIPTION
buffer_puterror2 writes the error message corresponding to the error
number in errnum to the buffer (e.g. "No such file or directory"
for ENOENT).
RETURN VALUE
0 if everything is fine, -1 on error (setting errno).