busybox/libbb/replace.c
Denys Vlasenko 6f068904dc xargs: add support for -I and -i. Closes 493
function                                             old     new   delta
process_stdin_with_replace                             -     195    +195
xmalloc_substitute_string                              -     145    +145
xargs_main                                           808     884     +76
count_strstr                                           -      45     +45
packed_usage                                       29580   29571      -9
parse_params                                        1445    1416     -29
func_exec                                            285     138    -147
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 1/3 up/down: 461/-185)          Total: 276 bytes
   text	   data	    bss	    dec	    hex	filename
 922156	    932	  17692	 940780	  e5aec	busybox_old
 922440	    932	  17692	 941064	  e5c08	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2014-02-27 11:17:06 +01:00

46 lines
1.1 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//kbuild:lib-y += replace.o
#include "libbb.h"
unsigned FAST_FUNC count_strstr(const char *str, const char *sub)
{
size_t sub_len = strlen(sub);
unsigned count = 0;
while ((str = strstr(str, sub)) != NULL) {
count++;
str += sub_len;
}
return count;
}
char* FAST_FUNC xmalloc_substitute_string(const char *src, int count, const char *sub, const char *repl)
{
char *buf, *dst, *end;
size_t sub_len = strlen(sub);
size_t repl_len = strlen(repl);
//dbg_msg("subst(s:'%s',count:%d,sub:'%s',repl:'%s'", src, count, sub, repl);
buf = dst = xmalloc(strlen(src) + count * ((int)repl_len - (int)sub_len) + 1);
/* we replace each sub with repl */
while ((end = strstr(src, sub)) != NULL) {
dst = mempcpy(dst, src, end - src);
dst = mempcpy(dst, repl, repl_len);
/*src = end + 1; - GNU findutils 4.5.10 doesn't do this... */
src = end + sub_len; /* but this. Try "xargs -Iaa echo aaa" */
}
strcpy(dst, src);
//dbg_msg("subst9:'%s'", buf);
return buf;
}