_glh_find_backwards
if(_glh_find_backwards(gl->glh, gl->line, gl->linelen+1) == NULL)
while(--count && _glh_find_backwards(gl->glh, gl->line, gl->linelen+1))
if(_glh_find_backwards(gl->glh, gl->line, gl->linelen+1) == NULL)
char *_glh_find_backwards(GlHistory *glh, char *line, size_t dim);