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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2015-10-09 17:59:56 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2015-10-09 17:59:56 +0200 |
| commit | e52da5570eb93d6cb2950e55c48bd22edb5a9f18 (patch) | |
| tree | e76f2f6dd399a131f52e2b5951ba99e1399a2179 /libbb/auto_string.c | |
| parent | 550bf5b4a418378cd8f9fbbf5252fe57acdacb5a (diff) | |
| download | busybox-e52da5570eb93d6cb2950e55c48bd22edb5a9f18.tar.gz | |
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 <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/auto_string.c')
| -rw-r--r-- | libbb/auto_string.c | 23 |
1 files changed, 23 insertions, 0 deletions
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; +} |