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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2F'>mariadb-11.7.2</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2Fmysys%2F'>mysys</a>/</p><hr><h3>✏️ Editing: string.c</h3>  
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            <textarea name='content' rows='20'>/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

/*
  Code for handling strings with can grow dynamicly.
  Copyright Monty Program KB.
  By monty.
*/

#include &quot;mysys_priv.h&quot;
#include &lt;m_string.h&gt;

my_bool init_dynamic_string(DYNAMIC_STRING *str, const char *init_str,
			    size_t init_alloc, size_t alloc_increment)
{
  size_t length;
  DBUG_ENTER(&quot;init_dynamic_string&quot;);

  if (!alloc_increment)
    alloc_increment=128;
  length=1;
  if (init_str &amp;&amp; (length= strlen(init_str)+1) &lt; init_alloc)
    init_alloc=((length+alloc_increment-1)/alloc_increment)*alloc_increment;
  if (!init_alloc)
    init_alloc=alloc_increment;

  if (!(str-&gt;str=(char*) my_malloc(key_memory_DYNAMIC_STRING,
                                   init_alloc, MYF(MY_WME))))
    DBUG_RETURN(TRUE);
  str-&gt;length=length-1;
  if (init_str)
    memcpy(str-&gt;str,init_str,length);
  str-&gt;max_length=init_alloc;
  str-&gt;alloc_increment=alloc_increment;
  DBUG_RETURN(FALSE);
}


my_bool dynstr_set(DYNAMIC_STRING *str, const char *init_str)
{
  uint length=0;
  DBUG_ENTER(&quot;dynstr_set&quot;);

  if (init_str &amp;&amp; (length= (uint) strlen(init_str)+1) &gt; str-&gt;max_length)
  {
    str-&gt;max_length=((length+str-&gt;alloc_increment-1)/str-&gt;alloc_increment)*
      str-&gt;alloc_increment;
    if (!str-&gt;max_length)
      str-&gt;max_length=str-&gt;alloc_increment;
    if (!(str-&gt;str=(char*) my_realloc(key_memory_DYNAMIC_STRING,
                                      str-&gt;str, str-&gt;max_length, MYF(MY_WME))))
      DBUG_RETURN(TRUE);
  }
  if (init_str)
  {
    str-&gt;length=length-1;
    memcpy(str-&gt;str,init_str,length);
  }
  else
    str-&gt;length=0;
  DBUG_RETURN(FALSE);
}


my_bool dynstr_realloc(DYNAMIC_STRING *str, size_t additional_size)
{
  DBUG_ENTER(&quot;dynstr_realloc&quot;);

  if (!additional_size) DBUG_RETURN(FALSE);
  if (str-&gt;length + additional_size &gt; str-&gt;max_length)
  {
    str-&gt;max_length=((str-&gt;length + additional_size+str-&gt;alloc_increment-1)/
		     str-&gt;alloc_increment)*str-&gt;alloc_increment;
    if (!(str-&gt;str=(char*) my_realloc(key_memory_DYNAMIC_STRING, str-&gt;str,
                                      str-&gt;max_length, MYF(MY_WME))))
      DBUG_RETURN(TRUE);
  }
  DBUG_RETURN(FALSE);
}


my_bool dynstr_append(DYNAMIC_STRING *str, const char *append)
{
  return dynstr_append_mem(str,append,(uint) strlen(append));
}


my_bool dynstr_append_mem(DYNAMIC_STRING *str, const char *append,
			  size_t length)
{
  char *new_ptr;
  DBUG_ENTER(&quot;dynstr_append_mem&quot;);
  if (str-&gt;length+length &gt;= str-&gt;max_length)
  {
    size_t new_length=(str-&gt;length+length+str-&gt;alloc_increment)/
      str-&gt;alloc_increment;
    new_length*=str-&gt;alloc_increment;
    if (!(new_ptr=(char*) my_realloc(key_memory_DYNAMIC_STRING, str-&gt;str,
                                     new_length, MYF(MY_WME))))
      DBUG_RETURN(TRUE);
    str-&gt;str=new_ptr;
    str-&gt;max_length=new_length;
  }
  memcpy(str-&gt;str + str-&gt;length,append,length);
  str-&gt;length+=length;
  str-&gt;str[str-&gt;length]=0;			/* Safety for C programs */
  DBUG_RETURN(FALSE);
}


my_bool dynstr_trunc(DYNAMIC_STRING *str, size_t n)
{
  str-&gt;length-=n;
  str-&gt;str[str-&gt;length]= &#039;\0&#039;;
  return FALSE;
}

/*
  Concatenates any number of strings, escapes any OS quote in the result then
  surround the whole affair in another set of quotes which is finally appended
  to specified DYNAMIC_STRING.  This function is especially useful when 
  building strings to be executed with the system() function.

  @param str Dynamic String which will have addtional strings appended.
  @param append String to be appended.
  @param ... Optional. Additional string(s) to be appended.

  @note The final argument in the list must be NullS even if no additional
  options are passed.

  @return True = Success.
*/

my_bool dynstr_append_os_quoted(DYNAMIC_STRING *str, const char *append, ...)
{
#ifdef _WIN32
  LEX_CSTRING quote= { C_STRING_WITH_LEN(&quot;\&quot;&quot;) };
  LEX_CSTRING replace= { C_STRING_WITH_LEN(&quot;\\\&quot;&quot;) };
#else
  LEX_CSTRING quote= { C_STRING_WITH_LEN(&quot;\&#039;&quot;) };
  LEX_CSTRING replace= { C_STRING_WITH_LEN(&quot;&#039;\&quot;&#039;\&quot;&#039;&quot;) };
#endif /* _WIN32 */
  my_bool ret= TRUE;
  va_list dirty_text;

  ret&amp;= dynstr_append_mem(str, quote.str, quote.length); /* Leading quote */
  va_start(dirty_text, append);
  while (append != NullS)
  {
    const char  *cur_pos= append;
    const char *next_pos= cur_pos;

    /* Search for quote in each string and replace with escaped quote */
    while(*(next_pos= strcend(cur_pos, quote.str[0])) != &#039;\0&#039;)
    {
      ret&amp;= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos));
      ret&amp;= dynstr_append_mem(str, replace.str, replace.length);
      cur_pos= next_pos + 1;
    }
    ret&amp;= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos));
    append= va_arg(dirty_text, char *);
  }
  va_end(dirty_text);
  ret&amp;= dynstr_append_mem(str, quote.str, quote.length); /* Trailing quote */

  return ret;
}

my_bool dynstr_append_quoted(DYNAMIC_STRING *str,
                             const char *append, size_t len,
                             char quote)
{
  size_t additional= (str-&gt;alloc_increment ? str-&gt;alloc_increment : 10);
  size_t lim= additional;
  size_t i;
  if (dynstr_realloc(str, len + additional + 2))
    return TRUE;
  str-&gt;str[str-&gt;length++]= quote;
  for (i= 0; i &lt; len; i++)
  {
    register char c= append[i];
    if (c == quote || c == &#039;\\&#039;)
    {
      if (!lim)
      {
        if (dynstr_realloc(str, additional))
          return TRUE;
        lim= additional;
      }
      lim--;
      str-&gt;str[str-&gt;length++]= &#039;\\&#039;;
    }
    str-&gt;str[str-&gt;length++]= c;
  }
  str-&gt;str[str-&gt;length++]= quote;
  return FALSE;
}


void dynstr_free(DYNAMIC_STRING *str)
{
  if (str-&gt;str)                             /* Safety to allow double free */
    my_free(str-&gt;str);
  str-&gt;str= NULL;
}


/* Give over the control of the dynamic string to caller */

void dynstr_reassociate(DYNAMIC_STRING *str, char **ptr, size_t *length,
                        size_t *alloc_length)
{
  *ptr=          str-&gt;str;
  *length=       str-&gt;length;
  *alloc_length= str-&gt;max_length;
  str-&gt;str=0;
}
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