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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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3
libbb/procps.c
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@@ -554,8 +554,7 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
break;
if (flags & PSSCAN_ARGVN) {
sp->argv_len = n;
sp->argv0 = xmalloc(n + 1);
memcpy(sp->argv0, buf, n + 1);
sp->argv0 = xmemdup(buf, n + 1);
/* sp->argv0[n] = '\0'; - buf has it */
} else {
sp->argv_len = 0;