diff options
| author | Ron Yorston <rmy@pobox.com> | 2019-04-15 10:48:29 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2019-04-16 18:29:52 +0200 |
| commit | a81700bc0810b2cad59d450a380ece20a8eb96a4 (patch) | |
| tree | 371499cb5755478247e8acaa864b89069ba71a94 /shell | |
| parent | 2efa726b22e9ebb7ee6c192a0fea0c478a857219 (diff) | |
| download | busybox-a81700bc0810b2cad59d450a380ece20a8eb96a4.tar.gz | |
hush: add bash-compatible EPOCH variables
Bash 5.0 added the dynamic variable EPOCHSECONDS and EPOCHREALTIME
which return the number of seconds since the Unix Epoch as an
integer or float. These are useful for logging or tracing.
function old new delta
get_local_var_value 207 302 +95
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 95/0) Total: 95 bytes
text data bss dec hex filename
938702 4203 1888 944793 e6a99 busybox_old
938797 4203 1888 944888 e6af8 busybox_unstripped
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/hush.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/shell/hush.c b/shell/hush.c index fa9afa38e..d745148f4 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -379,6 +379,7 @@ #define BASH_SUBSTR ENABLE_HUSH_BASH_COMPAT #define BASH_SOURCE ENABLE_HUSH_BASH_COMPAT #define BASH_HOSTNAME_VAR ENABLE_HUSH_BASH_COMPAT +#define BASH_EPOCH_VARS ENABLE_HUSH_BASH_COMPAT #define BASH_TEST2 (ENABLE_HUSH_BASH_COMPAT && ENABLE_HUSH_TEST) #define BASH_READ_D ENABLE_HUSH_BASH_COMPAT @@ -1011,6 +1012,9 @@ struct globals { int debug_indent; #endif struct sigaction sa; +#if BASH_EPOCH_VARS + char epoch_buf[sizeof("%lu.nnnnnn") + sizeof(long)*3]; +#endif #if ENABLE_FEATURE_EDITING char user_input_buf[CONFIG_FEATURE_EDITING_MAX_LEN]; #endif @@ -2228,6 +2232,22 @@ static const char* FAST_FUNC get_local_var_value(const char *name) if (strcmp(name, "RANDOM") == 0) return utoa(next_random(&G.random_gen)); #endif +#if BASH_EPOCH_VARS + { + const char *fmt = NULL; + if (strcmp(name, "EPOCHSECONDS") == 0) + fmt = "%lu"; + else if (strcmp(name, "EPOCHREALTIME") == 0) + fmt = "%lu.%06u"; + if (fmt) { + struct timeval tv; + gettimeofday(&tv, NULL); + sprintf(G.epoch_buf, fmt, (unsigned long)tv.tv_sec, + (unsigned)tv.tv_usec); + return G.epoch_buf; + } + } +#endif return NULL; } |