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/* 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 "mysys_priv.h"
#include <m_string.h>
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("init_dynamic_string");
if (!alloc_increment)
alloc_increment=128;
length=1;
if (init_str && (length= strlen(init_str)+1) < init_alloc)
init_alloc=((length+alloc_increment-1)/alloc_increment)*alloc_increment;
if (!init_alloc)
init_alloc=alloc_increment;
if (!(str->str=(char*) my_malloc(key_memory_DYNAMIC_STRING,
init_alloc, MYF(MY_WME))))
DBUG_RETURN(TRUE);
str->length=length-1;
if (init_str)
memcpy(str->str,init_str,length);
str->max_length=init_alloc;
str->alloc_increment=alloc_increment;
DBUG_RETURN(FALSE);
}
my_bool dynstr_set(DYNAMIC_STRING *str, const char *init_str)
{
uint length=0;
DBUG_ENTER("dynstr_set");
if (init_str && (length= (uint) strlen(init_str)+1) > str->max_length)
{
str->max_length=((length+str->alloc_increment-1)/str->alloc_increment)*
str->alloc_increment;
if (!str->max_length)
str->max_length=str->alloc_increment;
if (!(str->str=(char*) my_realloc(key_memory_DYNAMIC_STRING,
str->str, str->max_length, MYF(MY_WME))))
DBUG_RETURN(TRUE);
}
if (init_str)
{
str->length=length-1;
memcpy(str->str,init_str,length);
}
else
str->length=0;
DBUG_RETURN(FALSE);
}
my_bool dynstr_realloc(DYNAMIC_STRING *str, size_t additional_size)
{
DBUG_ENTER("dynstr_realloc");
if (!additional_size) DBUG_RETURN(FALSE);
if (str->length + additional_size > str->max_length)
{
str->max_length=((str->length + additional_size+str->alloc_increment-1)/
str->alloc_increment)*str->alloc_increment;
if (!(str->str=(char*) my_realloc(key_memory_DYNAMIC_STRING, str->str,
str->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("dynstr_append_mem");
if (str->length+length >= str->max_length)
{
size_t new_length=(str->length+length+str->alloc_increment)/
str->alloc_increment;
new_length*=str->alloc_increment;
if (!(new_ptr=(char*) my_realloc(key_memory_DYNAMIC_STRING, str->str,
new_length, MYF(MY_WME))))
DBUG_RETURN(TRUE);
str->str=new_ptr;
str->max_length=new_length;
}
memcpy(str->str + str->length,append,length);
str->length+=length;
str->str[str->length]=0; /* Safety for C programs */
DBUG_RETURN(FALSE);
}
my_bool dynstr_trunc(DYNAMIC_STRING *str, size_t n)
{
str->length-=n;
str->str[str->length]= '\0';
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("\"") };
LEX_CSTRING replace= { C_STRING_WITH_LEN("\\\"") };
#else
LEX_CSTRING quote= { C_STRING_WITH_LEN("\'") };
LEX_CSTRING replace= { C_STRING_WITH_LEN("'\"'\"'") };
#endif /* _WIN32 */
my_bool ret= TRUE;
va_list dirty_text;
ret&= 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])) != '\0')
{
ret&= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos));
ret&= dynstr_append_mem(str, replace.str, replace.length);
cur_pos= next_pos + 1;
}
ret&= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos));
append= va_arg(dirty_text, char *);
}
va_end(dirty_text);
ret&= 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->alloc_increment ? str->alloc_increment : 10);
size_t lim= additional;
size_t i;
if (dynstr_realloc(str, len + additional + 2))
return TRUE;
str->str[str->length++]= quote;
for (i= 0; i < len; i++)
{
register char c= append[i];
if (c == quote || c == '\\')
{
if (!lim)
{
if (dynstr_realloc(str, additional))
return TRUE;
lim= additional;
}
lim--;
str->str[str->length++]= '\\';
}
str->str[str->length++]= c;
}
str->str[str->length++]= quote;
return FALSE;
}
void dynstr_free(DYNAMIC_STRING *str)
{
if (str->str) /* Safety to allow double free */
my_free(str->str);
str->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->str;
*length= str->length;
*alloc_length= str->max_length;
str->str=0;
}
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