release/src/router/busybox/libbb/replace.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 //kbuild:lib-y += replace.o
  11
  12 #include "libbb.h"
  13
  14 unsigned FAST_FUNC count_strstr(const char *str, const char *sub)
  15 {
  16         size_t sub_len = strlen(sub);
  17         unsigned count = 0;
  18
  19         while ((str = strstr(str, sub)) != NULL) {
  20                 count++;
  21                 str += sub_len;
  22         }
  23         return count;
  24 }
  25
  26 char* FAST_FUNC xmalloc_substitute_string(const char *src, int count, const char *sub, const char *repl)
  27 {
  28         char *buf, *dst, *end;
  29         size_t sub_len = strlen(sub);
  30         size_t repl_len = strlen(repl);
  31
  32         //dbg_msg("subst(s:'%s',count:%d,sub:'%s',repl:'%s'", src, count, sub, repl);
  33
  34         buf = dst = xmalloc(strlen(src) + count * ((int)repl_len - (int)sub_len) + 1);
  35         /* we replace each sub with repl */
  36         while ((end = strstr(src, sub)) != NULL) {
  37                 dst = mempcpy(dst, src, end - src);
  38                 dst = mempcpy(dst, repl, repl_len);
  39                 /*src = end + 1; - GNU findutils 4.5.10 doesn't do this... */
  40                 src = end + sub_len; /* but this. Try "xargs -Iaa echo aaa" */
  41         }
  42         strcpy(dst, src);
  43         //dbg_msg("subst9:'%s'", buf);
  44         return buf;
  45 }