From e52da5570eb93d6cb2950e55c48bd22edb5a9f18 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Fri, 9 Oct 2015 17:59:56 +0200 Subject: libbb: auto_string() for efficient handling of temporary malloced stirngs Use it in libiproute: get rid of one static string buffer. function old new delta auto_string - 51 +51 ll_index_to_name 10 49 +39 buffer_fill_and_print 169 178 +9 scan_recursive 378 380 +2 decode_one_format 732 734 +2 cmdputs 334 332 -2 static.cur_saved 4 1 -3 static.nbuf 16 - -16 printable_string 94 57 -37 ll_idx_n2a 53 - -53 ------------------------------------------------------------------------------ (add/remove: 2/2 grow/shrink: 4/3 up/down: 103/-111) Total: -8 bytes text data bss dec hex filename 939880 992 17496 958368 e9fa0 busybox_old 939880 992 17480 958352 e9f90 busybox_unstripped Signed-off-by: Denys Vlasenko --- libbb/auto_string.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 libbb/auto_string.c (limited to 'libbb/auto_string.c') diff --git a/libbb/auto_string.c b/libbb/auto_string.c new file mode 100644 index 000000000..ae940069a --- /dev/null +++ b/libbb/auto_string.c @@ -0,0 +1,23 @@ +/* vi: set sw=4 ts=4: */ +/* + * Utility routines. + * + * Copyright (C) 2015 Denys Vlasenko + * + * Licensed under GPLv2, see file LICENSE in this source tree. + */ +//kbuild:lib-y += auto_string.o + +#include "libbb.h" + +char* FAST_FUNC auto_string(char *str) +{ + static char *saved[4]; + static uint8_t cur_saved; /* = 0 */ + + free(saved[cur_saved]); + saved[cur_saved] = str; + cur_saved = (cur_saved + 1) & (ARRAY_SIZE(saved)-1); + + return str; +} -- cgit v1.2.3