Want to use __ DATE __ and __ TIME __ as integer for giving automated version to my code in compile time.
#define STRINGIZER(arg) #arg
#define STR_VALUE(arg) STRINGIZER(arg)
#define DATE_as_int_str useD(__DATE__) // What can be done ?
#define TIME_as_int_str useT(__TIME__) // What can be done ?
#define VERSION 1.4
#define COMPLETE_VERSION STR_VALUE(VERSION) "." DATE_as_int_str "." TIME_as_int_str
and get COMPLETE_VERSION
as string in a const unsigned char []
.
const unsigned char completeVersion[] = ?? COMPLETE_VERSION;
Should output 1.4.1432.2234 something.
One of the possible solution could be but did not work: convert-date-to-unsigned-int
In context of compile time convertint-date-and-time-string-to-just-integers-in-c One can refer expanssion-and-stringification-how-to-get-the-marco-name-not-its-value
If you can use a C++ compiler to build the object file that you want to contain your version string, then we can do exactly what you want! The only magic here is that C++ allows you to use expressions to statically initialize an array, while C doesn't. The expressions need to be fully computable at compile time, but these expressions are, so it's no problem.
We build up the version string one byte at a time, and get exactly what we want.
// source file version_num.h
#ifndef VERSION_NUM_H
#define VERSION_NUM_H
#define VERSION_MAJOR 1
#define VERSION_MINOR 4
#endif // VERSION_NUM_H
// source file build_defs.h
#ifndef BUILD_DEFS_H
#define BUILD_DEFS_H
// Example of __DATE__ string: "Jul 27 2012"
// 01234567890
#define BUILD_YEAR_CH0 (__DATE__[ 7])
#define BUILD_YEAR_CH1 (__DATE__[ 8])
#define BUILD_YEAR_CH2 (__DATE__[ 9])
#define BUILD_YEAR_CH3 (__DATE__[10])
#define BUILD_MONTH_IS_JAN (__DATE__[0] == 'J' && __DATE__[1] == 'a' && __DATE__[2] == 'n')
#define BUILD_MONTH_IS_FEB (__DATE__[0] == 'F')
#define BUILD_MONTH_IS_MAR (__DATE__[0] == 'M' && __DATE__[1] == 'a' && __DATE__[2] == 'r')
#define BUILD_MONTH_IS_APR (__DATE__[0] == 'A' && __DATE__[1] == 'p')
#define BUILD_MONTH_IS_MAY (__DATE__[0] == 'M' && __DATE__[1] == 'a' && __DATE__[2] == 'y')
#define BUILD_MONTH_IS_JUN (__DATE__[0] == 'J' && __DATE__[1] == 'u' && __DATE__[2] == 'n')
#define BUILD_MONTH_IS_JUL (__DATE__[0] == 'J' && __DATE__[1] == 'u' && __DATE__[2] == 'l')
#define BUILD_MONTH_IS_AUG (__DATE__[0] == 'A' && __DATE__[1] == 'u')
#define BUILD_MONTH_IS_SEP (__DATE__[0] == 'S')
#define BUILD_MONTH_IS_OCT (__DATE__[0] == 'O')
#define BUILD_MONTH_IS_NOV (__DATE__[0] == 'N')
#define BUILD_MONTH_IS_DEC (__DATE__[0] == 'D')
#define BUILD_MONTH_CH0 \
((BUILD_MONTH_IS_OCT || BUILD_MONTH_IS_NOV || BUILD_MONTH_IS_DEC) ? '1' : '0')
#define BUILD_MONTH_CH1 \
( \
(BUILD_MONTH_IS_JAN) ? '1' : \
(BUILD_MONTH_IS_FEB) ? '2' : \
(BUILD_MONTH_IS_MAR) ? '3' : \
(BUILD_MONTH_IS_APR) ? '4' : \
(BUILD_MONTH_IS_MAY) ? '5' : \
(BUILD_MONTH_IS_JUN) ? '6' : \
(BUILD_MONTH_IS_JUL) ? '7' : \
(BUILD_MONTH_IS_AUG) ? '8' : \
(BUILD_MONTH_IS_SEP) ? '9' : \
(BUILD_MONTH_IS_OCT) ? '0' : \
(BUILD_MONTH_IS_NOV) ? '1' : \
(BUILD_MONTH_IS_DEC) ? '2' : \
/* error default */ '?' \
)
#define BUILD_DAY_CH0 ((__DATE__[4] >= '0') ? (__DATE__[4]) : '0')
#define BUILD_DAY_CH1 (__DATE__[ 5])
// Example of __TIME__ string: "21:06:19"
// 01234567
#define BUILD_HOUR_CH0 (__TIME__[0])
#define BUILD_HOUR_CH1 (__TIME__[1])
#define BUILD_MIN_CH0 (__TIME__[3])
#define BUILD_MIN_CH1 (__TIME__[4])
#define BUILD_SEC_CH0 (__TIME__[6])
#define BUILD_SEC_CH1 (__TIME__[7])
#if VERSION_MAJOR > 100
#define VERSION_MAJOR_INIT \
((VERSION_MAJOR / 100) + '0'), \
(((VERSION_MAJOR % 100) / 10) + '0'), \
((VERSION_MAJOR % 10) + '0')
#elif VERSION_MAJOR > 10
#define VERSION_MAJOR_INIT \
((VERSION_MAJOR / 10) + '0'), \
((VERSION_MAJOR % 10) + '0')
#else
#define VERSION_MAJOR_INIT \
(VERSION_MAJOR + '0')
#endif
#if VERSION_MINOR > 100
#define VERSION_MINOR_INIT \
((VERSION_MINOR / 100) + '0'), \
(((VERSION_MINOR % 100) / 10) + '0'), \
((VERSION_MINOR % 10) + '0')
#elif VERSION_MINOR > 10
#define VERSION_MINOR_INIT \
((VERSION_MINOR / 10) + '0'), \
((VERSION_MINOR % 10) + '0')
#else
#define VERSION_MINOR_INIT \
(VERSION_MINOR + '0')
#endif
#endif // BUILD_DEFS_H
// source file main.c
#include "version_num.h"
#include "build_defs.h"
// want something like: 1.4.1432.2234
const unsigned char completeVersion[] =
{
VERSION_MAJOR_INIT,
'.',
VERSION_MINOR_INIT,
'-', 'V', '-',
BUILD_YEAR_CH0, BUILD_YEAR_CH1, BUILD_YEAR_CH2, BUILD_YEAR_CH3,
'-',
BUILD_MONTH_CH0, BUILD_MONTH_CH1,
'-',
BUILD_DAY_CH0, BUILD_DAY_CH1,
'T',
BUILD_HOUR_CH0, BUILD_HOUR_CH1,
':',
BUILD_MIN_CH0, BUILD_MIN_CH1,
':',
BUILD_SEC_CH0, BUILD_SEC_CH1,
'\0'
};
#include <stdio.h>
int main(int argc, char **argv)
{
printf("%s\n", completeVersion);
// prints something similar to: 1.4-V-2013-05-09T15:34:49
}
This isn't exactly the format you asked for, but I still don't fully understand how you want days and hours mapped to an integer. I think it's pretty clear how to make this produce any desired string.