m4 ChangeLog NEWS src/builtin.c src/input.c [branch-1_4]

[Eric Blake]

CVSROOT:        /sources/m4
Module name:    m4
Branch:         branch-1_4
Changes by:     Eric Blake <ericb>      06/08/18 16:28:22

Modified files:
        .              : ChangeLog NEWS 
        src            : builtin.c input.c 

Log message:
        Regular expressions were leaking memory.
        * src/builtin.c (init_pattern_buffer, free_pattern_buffer): New
        helper methods.
        (m4_regexp, m4_patsubst): Avoid memory leak.
        * src/input.c (init_pattern_buffer) [ENABLE_CHANGEWORD]: Make
        static.
        (set_word_regexp) [ENABLE_CHANGEWORD]: Avoid memory leak.  Change
        from O(n^2) to O(n) for calculating word_start.
        (next_token, peek_token) [ENABLE_CHANGEWORD]: Treat word_start as
        O(1) bitmap, not O(n) search string.
        * NEWS: Document this fix.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/m4/ChangeLog?cvsroot=m4&only_with_tag=branch-1_4&r1=1.1.1.1.2.159&r2=1.1.1.1.2.160
http://cvs.savannah.gnu.org/viewcvs/m4/NEWS?cvsroot=m4&only_with_tag=branch-1_4&r1=1.1.1.1.2.53&r2=1.1.1.1.2.54
http://cvs.savannah.gnu.org/viewcvs/m4/src/builtin.c?cvsroot=m4&only_with_tag=branch-1_4&r1=1.1.1.1.2.34&r2=1.1.1.1.2.35
http://cvs.savannah.gnu.org/viewcvs/m4/src/input.c?cvsroot=m4&only_with_tag=branch-1_4&r1=1.1.1.1.2.19&r2=1.1.1.1.2.20