mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*
|
|
* have_offscl - determine if have a scalar off_t element
|
|
*
|
|
* usage:
|
|
* have_offscl
|
|
*
|
|
* On some systems, off_t is a scalar value on which one can perform
|
|
* arithmetic operations, assignments and comparisons. On some systems
|
|
* off_t is some sort of union or struct which must be converted into
|
|
* a ZVALUE in order to perform arithmetic operations, assignments and
|
|
* comparisons.
|
|
*
|
|
*
|
|
* This prog outputs several defines:
|
|
*
|
|
* HAVE_OFF_T_SCALAR
|
|
* defined ==> ok to perform arithmetic ops, = and comparisons
|
|
* undefined ==> convert to ZVALUE first
|
|
*/
|
|
/*
|
|
* Copyright (c) 1996 by Landon Curt Noll. All Rights Reserved.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and
|
|
* its documentation for any purpose and without fee is hereby granted,
|
|
* provided that the above copyright, this permission notice and text
|
|
* this comment, and the disclaimer below appear in all of the following:
|
|
*
|
|
* supporting documentation
|
|
* source copies
|
|
* source works derived from this source
|
|
* binaries derived from this source or from derived source
|
|
*
|
|
* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
|
|
* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
|
|
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
|
|
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* chongo was here /\../\
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
#if !defined(OFF_T_NON_SCALAR)
|
|
off_t value; /* an off_t to perform arithmatic on */
|
|
off_t value2; /* an off_t to perform arithmatic on */
|
|
|
|
/*
|
|
* do some math opts on an off_t
|
|
*/
|
|
value = (off_t)getpid();
|
|
value2 = (off_t)-1;
|
|
if (value > (off_t)1) {
|
|
--value;
|
|
}
|
|
if (value <= (off_t)getppid()) {
|
|
--value;
|
|
}
|
|
if (value == value2) {
|
|
value += value2;
|
|
}
|
|
value <<= 1;
|
|
if (!value) {
|
|
printf("/* something for the off_t to do */\n");
|
|
}
|
|
|
|
/*
|
|
* report off_t as a scalar
|
|
*/
|
|
printf("#undef HAVE_OFF_T_SCALAR\n");
|
|
printf("#define HAVE_OFF_T_SCALAR /* off_t is a simple value */\n");
|
|
#else
|
|
printf("#undef HAVE_OFF_T_SCALAR /* off_t is not a simple value */\n");
|
|
#endif
|
|
/* exit(0); */
|
|
return 0;
|
|
}
|