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fposval.c
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fposval.c
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/*
* fposval - Determine information about the file position type
*
* Copyright (C) 1999,2021,2023 Landon Curt Noll
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc 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 Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Under source code control: 1994/11/05 03:19:52
* File existed as early as: 1994
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
/*
* The include file have_pos.h, as built during the make process will
* define the type FILEPOS as the type used to describe file positions.
* We will print information regarding the size and byte order
* of this definition.
*
* The stat system call returns a stat structure. One of the elements
* of the stat structure is the st_size element. We will print information
* regarding the size and byte order of st_size.
*
* We will #define of 8 symbols:
*
* FILEPOS_BITS length in bits of the type FILEPOS
* FILEPOS_LEN length in octets of the type FILEPOS
* SWAP_HALF_IN_FILEPOS will copy/swap FILEPOS into an HALF array
* OFF_T_BITS length in bits of the st_size stat element
* OFF_T_LEN length in octets of the st_size stat element
* SWAP_HALF_IN_OFF_T will copy/swap st_size into an HALF array
* DEV_BITS length in bits of the st_dev stat element
* DEV_LEN length in bits of the st_dev stat element
* SWAP_HALF_IN_DEV will copy/swap st_dev into an HALF array
* INODE_BITS length in bits of the st_ino stat element
* INODE_LEN length in octets of the st_ino stat element
* SWAP_HALF_IN_INODE will copy/swap st_ino into an HALF array
*
* With regards to 'will copy/swap ... into an HALF array'. Such macros
* will either be a copy or a copy with HALFs swapped depending on the
* Endian order of the hardware.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "have_string.h"
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#include "decl.h"
#include "have_fgetsetpos.h"
#include "endian_calc.h"
#include "have_offscl.h"
#include "have_posscl.h"
#include "have_fpos_pos.h"
#include "alloc.h"
#include "have_unused.h"
#include "have_memmv.h"
#include "zmath.h"
#include "banned.h" /* include after system header <> includes */
char *program; /* our name */
int
main(int UNUSED(argc), char **argv)
{
int stsizelen; /* bit length of st_size in buf */
int fileposlen; /* bit length of FILEPOS */
int devlen; /* bit length of st_dev in buf */
int inodelen; /* bit length of st_ino in buf */
struct stat buf; /* file status */
/*
* parse args
*/
program = argv[0];
/*
* print the file position information
*/
#if defined(HAVE_FPOS_POS) && defined(FPOS_POS_BITS)
fileposlen = FPOS_POS_BITS;
#else /* ! HAVE_FPOS_POS */
# if defined(FPOS_BITS)
fileposlen = FPOS_BITS;
# else
fileposlen = sizeof(FILEPOS)*8;
# endif
#endif /* ! HAVE_FPOS_POS */
printf("#undef FILEPOS_BITS\n");
printf("#define FILEPOS_BITS %d\n", fileposlen);
printf("#undef FILEPOS_LEN\n");
printf("#define FILEPOS_LEN %d\n", fileposlen/8);
#if CALC_BYTE_ORDER == BIG_ENDIAN
/*
* Big Endian
*/
/*
* Use casts to (HALF *) because SWAP_HALF_IN_B* might expand to
* a simple assignment and SWAP_HALF_IN_FILEPOS might get a
* (HALF *) and a (FILEPOS *) which are not assignment-compatible.
*/
if (fileposlen == 64) {
printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
"\tSWAP_HALF_IN_B64((HALF *)dest, (HALF *)src)\n");
} else if (fileposlen == 32) {
printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
"\tSWAP_HALF_IN_B32((HALF *)dest, (HALF *)src)\n");
} else if (fileposlen%BASEB == 0) {
printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
"\tswap_HALFs((HALF *)dest, (HALF *)src, %d)\n",
fileposlen/BASEB);
} else {
fprintf(stderr, "%s: unexpected BIG_ENDIAN FILEPOS bit size: %d\n",
program, fileposlen);
exit(1);
}
#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
/*
* Little Endian
*/
#if defined(HAVE_FILEPOS_SCALAR)
printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
"\t(*((HALF *)(dest)) = *((HALF *)(src)))\n");
#else /* HAVE_FILEPOS_SCALAR */
/*
* Normally a "(*(dest) = *(src))" would do, but on some
* systems a FILEPOS is not a scalar hence we must memcpy.
*/
printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
"\tmemcpy((void *)(dest), (void *)(src), FILEPOS_LEN)\n");
#endif /* HAVE_FILEPOS_SCALAR */
#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
putchar('\n');
/*
* print the stat file size information
*/
#if defined(OFF_T_BITS)
stsizelen = OFF_T_BITS;
#else
stsizelen = sizeof(buf.st_size)*8;
#endif
printf("#undef OFF_T_BITS\n");
printf("#define OFF_T_BITS %d\n", stsizelen);
printf("#undef OFF_T_LEN\n");
printf("#define OFF_T_LEN %d\n", stsizelen/8);
#if CALC_BYTE_ORDER == BIG_ENDIAN
/*
* Big Endian
*/
if (stsizelen == 64) {
printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t\t%s\n",
"SWAP_HALF_IN_B64(dest, src)");
} else if (stsizelen == 32) {
printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t\t%s\n",
"SWAP_HALF_IN_B32(dest, src)");
} else {
fprintf(stderr, "%s: unexpected st_size bit size: %d\n",
program, stsizelen);
exit(2);
}
#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
/*
* Little Endian
*
* Normally a "(*(dest) = *(src))" would do, but on some
* systems an off_t is not a scalar hence we must memcpy.
*/
#if defined(HAVE_OFF_T_SCALAR)
printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t\t%s\n",
"(*(dest) = *(src))");
#else /* HAVE_OFF_T_SCALAR */
/*
* Normally a "(*(dest) = *(src))" would do, but on some
* systems, a off_t is not a scalar hence we must memcpy.
*/
printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t%s%d%s\n",
"memcpy((void *)(dest), (void *)(src), ", stsizelen/8, ")");
#endif /* HAVE_OFF_T_SCALAR */
#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
putchar('\n');
/*
* print the dev_t size
*/
#if defined(DEV_BITS)
devlen = DEV_BITS;
#else
devlen = sizeof(buf.st_dev)*8;
#endif
printf("#undef DEV_BITS\n");
printf("#define DEV_BITS %d\n", devlen);
printf("#undef DEV_LEN\n");
printf("#define DEV_LEN %d\n", devlen/8);
#if CALC_BYTE_ORDER == BIG_ENDIAN
/*
* Big Endian
*/
if (devlen == 64) {
printf("#define SWAP_HALF_IN_DEV(dest, src)\t\t%s\n",
"SWAP_HALF_IN_B64(dest, src)");
} else if (devlen == 32) {
printf("#define SWAP_HALF_IN_DEV(dest, src)\t\t%s\n",
"SWAP_HALF_IN_B32(dest, src)");
} else if (devlen == 16) {
printf("#define SWAP_HALF_IN_DEV(dest, src)\t\t%s\n",
"(*(dest) = *(src))");
} else {
fprintf(stderr, "%s: unexpected st_dev bit size: %d\n",
program, devlen);
exit(3);
}
#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
/*
* Little Endian
*
* Normally a "(*(dest) = *(src))" would do, but on some
* systems, a DEV is not a scalar hence we must memcpy.
*/
printf("#define SWAP_HALF_IN_DEV(dest, src)\t%s%d%s\n",
"memcpy((void *)(dest), (void *)(src), ", devlen/8, ")");
#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
putchar('\n');
/*
* print the ino_t size
*/
#if defined(INODE_BITS)
inodelen = INODE_BITS;
#else
inodelen = sizeof(buf.st_ino)*8;
#endif
printf("#undef INODE_BITS\n");
printf("#define INODE_BITS %d\n", inodelen);
printf("#undef INODE_LEN\n");
printf("#define INODE_LEN %d\n", inodelen/8);
#if CALC_BYTE_ORDER == BIG_ENDIAN
/*
* Big Endian
*/
if (inodelen == 64) {
printf("#define SWAP_HALF_IN_INODE(dest, src)\t\t%s\n",
"SWAP_HALF_IN_B64(dest, src)");
} else if (inodelen == 32) {
printf("#define SWAP_HALF_IN_INODE(dest, src)\t\t%s\n",
"SWAP_HALF_IN_B32(dest, src)");
} else if (inodelen == 16) {
printf("#define SWAP_HALF_IN_INODE(dest, src)\t\t%s\n",
"(*(dest) = *(src))");
} else {
fprintf(stderr, "%s: unexpected st_ino bit size: %d\n",
program, inodelen);
exit(4);
}
#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
/*
* Little Endian
*
* Normally a "(*(dest) = *(src))" would do, but on some
* systems, a INODE is not a scalar hence we must memcpy.
*/
printf("#define SWAP_HALF_IN_INODE(dest, src)\t%s%d%s\n",
"memcpy((void *)(dest), (void *)(src), ", inodelen/8, ")");
#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
/* exit(0); */
return 0;
}