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libbb: add a function to make a copy of a region of memory

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Introduce a library routine to package the idiom:

    p = xmalloc(b, n);
    memcpy(p, b, n);

and use it where possible.  The example in traceroute used xzalloc
but it didn't need to.

function                                             old     new   delta
xmemdup                                                -      32     +32
last_main                                            834     826      -8
make_device                                         2321    2311     -10
common_traceroute_main                              3698    3685     -13
readtoken1                                          3182    3168     -14
procps_scan                                         1222    1206     -16
forkchild                                            655     638     -17
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/6 up/down: 32/-78)            Total: -46 bytes

Signed-off-by: Ron Yorston <rmy@frippery.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston
2015-07-19 23:05:20 +02:00
committed by Denys Vlasenko
parent 78cfa00154
commit d840c5d139
8 changed files with 13 additions and 17 deletions
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5
libbb/xfuncs_printf.c
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@@ -112,6 +112,11 @@ char* FAST_FUNC xstrndup(const char *s, int n)
return memcpy(t, s, n);
}
void* FAST_FUNC xmemdup(const void *s, int n)
{
return memcpy(xmalloc(n), s, n);
}
// Die if we can't open a file and return a FILE* to it.
// Notice we haven't got xfread(), This is for use with fscanf() and friends.
FILE* FAST_FUNC xfopen(const char *path, const char *mode)