mirror of https://github.com/acanas/swad-core.git
113 lines
4.8 KiB
C
113 lines
4.8 KiB
C
// swad_constant.h: common constants used in several modules
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#ifndef _SWAD_CNS
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#define _SWAD_CNS
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/*
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SWAD (Shared Workspace At a Distance),
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is a web platform developed at the University of Granada (Spain),
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and used to support university teaching.
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This file is part of SWAD core.
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Copyright (C) 1999-2024 Antonio Cañas Vargas
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*****************************************************************************/
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/********************************* Headers ***********************************/
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/*****************************************************************************/
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#include "swad_string.h"
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/*****************************************************************************/
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/***************************** Public constants ******************************/
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/*****************************************************************************/
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#define Cns_MAX_CHARS_IP (3 + 1 + 3 + 1 + 3 + 1 + 3) // 15: max. number of chars of an IP address
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// Example: 255.255.255.255
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// 3+1+3+1+3+1+3
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// 123456789012345
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#define Cns_MAX_BYTES_IP Cns_MAX_CHARS_IP // 15
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#define Cns_MAX_CHARS_DATE (16 - 1) // 15
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#define Cns_MAX_BYTES_DATE ((Cns_MAX_CHARS_DATE + 1) * Str_MAX_BYTES_PER_CHAR - 1) // 255
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#define Cns_MAX_CHARS_EMAIL_ADDRESS (256 - 1) // 255
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#define Cns_MAX_BYTES_EMAIL_ADDRESS Cns_MAX_CHARS_EMAIL_ADDRESS // 255
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#define Cns_MAX_BYTES_USR_LOGIN Cns_MAX_BYTES_EMAIL_ADDRESS // 255
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#define Cns_MAX_CHARS_SUBJECT (256 - 1) // 255
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#define Cns_MAX_BYTES_SUBJECT ((Cns_MAX_CHARS_SUBJECT + 1) * Str_MAX_BYTES_PER_CHAR - 1) // 4095
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#define Cns_MAX_BYTES_TEXT ( 64 * 1024 - 1) // Used for medium texts
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#define Cns_MAX_BYTES_LONG_TEXT (256 * 1024 - 1) // Used for big contents
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#define Cns_BYTES_SESSION_ID Cry_BYTES_ENCRYPTED_STR_SHA256_BASE64
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/*
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The maximum number of decimal digits d of an integer of b bits
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(signed or unsigned) matches the number of digits of the number 2^b.
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In the case of signed numbers, an extra character must be added for the sign.
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The number of decimal digits of a number X can be calculated as log_10(X), rounded up.
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Therefore, log_10(2^b) = b * log_10(2) = b * 0.301029995663981
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If s is the size in bytes of a certain type of integer,
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given by the sizeof operator, its size b in bits will be b = (s * 8).
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The maximum number of decimal digits will be (s * 8) * 0.301029995663981, rounded up.
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Rounding up will consist of truncating (converting to an integer), and adding 1.
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Unfortunately, the use of floating point may cause problems
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when evaluating the expressions as constants. It's necessary to modify them,
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for example by multiplying by 2 ^ 11 and dividing by 2 ^ 8,
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so that all calculations should be performed by the preprocessor with integers.
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*/
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#define LOG2_x_2_11 616 // log10(2) * 2^11
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#define Cns_MAX_DECIMAL_DIGITS_UCHAR (((sizeof (unsigned char ) * LOG2_x_2_11) >> 8) + 1)
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#define Cns_MAX_DECIMAL_DIGITS_USHORT (((sizeof (unsigned short ) * LOG2_x_2_11) >> 8) + 1)
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#define Cns_MAX_DECIMAL_DIGITS_UINT (((sizeof (unsigned int ) * LOG2_x_2_11) >> 8) + 1)
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#define Cns_MAX_DECIMAL_DIGITS_ULONG (((sizeof (unsigned long ) * LOG2_x_2_11) >> 8) + 1)
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#define Cns_MAX_DECIMAL_DIGITS_ULONGLONG (((sizeof (unsigned long long) * LOG2_x_2_11) >> 8) + 1)
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#define Cns_MAX_DECIMAL_DIGITS_UINT128 (((sizeof (unsigned __int128 ) * LOG2_x_2_11) >> 8) + 1)
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#define Cns_MAX_DECIMAL_DIGITS_CHAR (1 + Cns_MAX_DECIMAL_DIGITS_UCHAR )
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#define Cns_MAX_DECIMAL_DIGITS_SHORT (1 + Cns_MAX_DECIMAL_DIGITS_USHORT )
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#define Cns_MAX_DECIMAL_DIGITS_INT (1 + Cns_MAX_DECIMAL_DIGITS_UINT )
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#define Cns_MAX_DECIMAL_DIGITS_LONG (1 + Cns_MAX_DECIMAL_DIGITS_ULONG )
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#define Cns_MAX_DECIMAL_DIGITS_LONGLONG (1 + Cns_MAX_DECIMAL_DIGITS_ULONGLONG)
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#define Cns_MAX_DECIMAL_DIGITS_INT128 (1 + Cns_MAX_DECIMAL_DIGITS_UINT128 )
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/*****************************************************************************/
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/******************************* Public types ********************************/
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/*****************************************************************************/
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typedef enum
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{
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Cns_QUIET,
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Cns_VERBOSE,
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} Cns_QuietOrVerbose_t;
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#define Cns_NUM_DISABLED_ENABLED 2
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typedef enum
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{
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Cns_DISABLED,
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Cns_ENABLED,
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} Cns_DisabledOrEnabled_t;
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#endif
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