LXR 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
  14unsigned 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
  26char* 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}
  46