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Current File : /usr/include/mysql/mysql//service_my_snprintf.h

#ifndef MYSQL_SERVICE_MY_SNPRINTF_INCLUDED
#define MYSQL_SERVICE_MY_SNPRINTF_INCLUDED
/* Copyright (c) 2009, 2022, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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 02110-1301  USA */

/**
  @file
  my_snprintf service

  Portable and limited vsnprintf() implementation.

  This is a portable, limited vsnprintf() implementation, with some
  extra features. "Portable" means that it'll produce identical result
  on all platforms (for example, on Windows and Linux system printf %e
  formats the exponent differently, on different systems %p either
  prints leading 0x or not, %s may accept null pointer or crash on
  it). "Limited" means that it does not support all the C89 features.
  But it supports few extensions, not in any standard.

  my_vsnprintf(to, n, fmt, ap)

  @param[out] to     A buffer to store the result in
  @param[in]  n      Store up to n-1 characters, followed by an end 0
  @param[in]  fmt    printf-like format string
  @param[in]  ap     Arguments

  @return a number of bytes written to a buffer *excluding* terminating '\0'

  @post
  The syntax of a format string is generally the same:
  % <flag> <width> <precision> <length modifier> <format>
  where everithing but the format is optional.

  Three one-character flags are recognized:
    '0' has the standard zero-padding semantics;
    '-' is parsed, but silently ignored;
    '`' (backtick) is only supported for strings (%s) and means that the
        string will be quoted according to MySQL identifier quoting rules.

  Both <width> and <precision> can be specified as numbers or '*'.
  If an asterisk is used, an argument of type int is consumed.

  <length modifier> can be 'l', 'll', or 'z'.

  Supported formats are 's' (null pointer is accepted, printed as
  "(null)"), 'b' (extension, see below), 'c', 'd', 'i', 'u', 'x', 'o',
  'X', 'p' (works as 0x%x).

  Standard syntax for positional arguments $n is supported.

  Extensions:

  Flag '`' (backtick): see above.

  Format 'b': binary buffer, prints exactly <precision> bytes from the
  argument, without stopping at '\0'.
*/

#ifdef __cplusplus
extern "C" {
#endif

#ifndef MYSQL_ABI_CHECK
#include <stdarg.h>
#include <stdlib.h>
#endif

extern struct my_snprintf_service_st {
  size_t (*my_snprintf_type)(char*, size_t, const char*, ...);
  size_t (*my_vsnprintf_type)(char *, size_t, const char*, va_list);
} *my_snprintf_service;

#ifdef MYSQL_DYNAMIC_PLUGIN

#define my_vsnprintf my_snprintf_service->my_vsnprintf_type
#define my_snprintf my_snprintf_service->my_snprintf_type

#else

size_t my_snprintf(char* to, size_t n, const char* fmt, ...);
size_t my_vsnprintf(char *to, size_t n, const char* fmt, va_list ap);

#endif

#ifdef __cplusplus
}
#endif

#endif /* #define MYSQL_SERVICE_MY_SNPRINTF_INCLUDED */

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