CVSROOT: /cvs
Module name: src
Changes by: chel...@cvs.openbsd.org 2022/09/02 09:21:40
Modified files:
usr.bin/wc : wc.c
Log message:
wc(1): accelerate word counting
wc(1) counts a word whenever a whitespace byte is followed by a
non-whitespace byte. Because the state machine transition occurs
within the space of a single byte we don't need to use getline(3).
Counting words in a big buffer with read(2) is much faster. The
overhead varies with the length of a line, but for files with 60-100
byte lines, word counting is about twice as fast when we avoid
getline(3). In the pathological case where each line is a single
byte, word counting is about ten times as fast when we avoid
getline(3).
Link1: https://marc.info/?l=openbsd-tech&m=163715995626532&w=2
Link2: https://marc.info/?l=openbsd-tech&m=165956826103639&w=2
"Seems reasonable." deraadt@
