mirror of
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231 lines
7.1 KiB
C
231 lines
7.1 KiB
C
/*
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* fposval - Determine information about the file position type
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*
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* The include file have_pos.h, as built during the make process will
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* define the type FILEPOS as the type used to describe file positions.
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* We will print information regarding the size and byte order
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* of this definition.
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*
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* The stat system call returns a stat structure. One of the elements
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* of the stat structure is the st_size element. We will print information
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* regarding the size and byte order of st_size.
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*
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* We will #define of 8 symbols:
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*
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* FILEPOS_BITS length in bits of the type FILEPOS
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* SWAP_HALF_IN_FILEPOS will copy/swap FILEPOS into an HALF array
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* OFF_T_BITS length in bits of the st_size stat element
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* SWAP_HALF_IN_OFF_T will copy/swap st_size into an HALF array
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* DEV_BITS length in bits of the st_dev stat element
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* SWAP_HALF_IN_DEV will copy/swap st_dev into an HALF array
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* INODE_BITS length in bits of the st_ino stat element
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* SWAP_HALF_IN_INODE will copy/swap st_ino into an HALF array
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*
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* With regards to 'will copy/swap ... into an HALF array'. Such macros
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* will either be a copy or a copy with HALFs swapped depending on the
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* Endian order of the hardware.
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*/
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/*
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* Copyright (c) 1996 by Landon Curt Noll. All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright, this permission notice and text
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* this comment, and the disclaimer below appear in all of the following:
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*
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* supporting documentation
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* source copies
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* source works derived from this source
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* binaries derived from this source or from derived source
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* chongo was here /\../\
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "have_fpos.h"
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#include "endian_calc.h"
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#include "have_offscl.h"
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#include "have_posscl.h"
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char *program; /* our name */
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int
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main(int argc, char **argv)
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{
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int stsizelen; /* bit length of st_size in buf */
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int fileposlen; /* bit length of FILEPOS */
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int devlen; /* bit length of st_dev in buf */
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int inodelen; /* bit length of st_ino in buf */
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struct stat buf; /* file status */
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/*
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* parse args
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*/
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program = argv[0];
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/*
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* print the file position information
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*/
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fileposlen = sizeof(FILEPOS)*8;
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printf("#undef FILEPOS_BITS\n");
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printf("#define FILEPOS_BITS %d\n", fileposlen);
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#if CALC_BYTE_ORDER == BIG_ENDIAN
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/*
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* Big Endian
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*/
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if (fileposlen == 64) {
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B64(dest, src)");
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} else if (fileposlen == 32) {
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B32(dest, src)");
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} else {
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fprintf(stderr, "%s: unexpected FILEPOS bit size: %d\n",
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program, fileposlen);
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exit(1);
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}
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#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
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/*
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* Little Endian
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*/
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#if defined(HAVE_FILEPOS_SCALAR)
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src)\t\t%s\n",
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"(*(dest) = *(src))");
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#else /* HAVE_FILEPOS_SCALAR */
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/*
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* Normally a "(*(dest) = *(src))" would do, but on some
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* systems a FILEPOS is not a scalar hince we must memcpy.
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*/
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src)\t%s%d%s\n",
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"memcpy((void *)(dest), (void *)(src), sizeof(",fileposlen,"))");
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#endif /* HAVE_FILEPOS_SCALAR */
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#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
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putchar('\n');
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/*
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* print the stat file size information
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*/
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stsizelen = sizeof(buf.st_size)*8;
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printf("#undef OFF_T_BITS\n");
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printf("#define OFF_T_BITS %d\n", stsizelen);
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#if CALC_BYTE_ORDER == BIG_ENDIAN
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/*
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* Big Endian
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*/
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if (stsizelen == 64) {
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printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B64(dest, src)");
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} else if (stsizelen == 32) {
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printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B32(dest, src)");
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} else {
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fprintf(stderr, "%s: unexpected st_size bit size: %d\n",
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program, stsizelen);
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exit(2);
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}
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#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
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/*
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* Little Endian
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*
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* Normally a "(*(dest) = *(src))" would do, but on some
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* systems an off_t is not a scalar hince we must memcpy.
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*/
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#if defined(HAVE_OFF_T_SCALAR)
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printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t\t%s\n",
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"(*(dest) = *(src))");
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#else /* HAVE_OFF_T_SCALAR */
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/*
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* Normally a "(*(dest) = *(src))" would do, but on some
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* systems, a off_t is not a scalar hince we must memcpy.
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*/
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printf("#define SWAP_HALF_IN_OFF_T(dest, src)\t%s%d%s\n",
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"memcpy((void *)(dest), (void *)(src), sizeof(",stsizelen,"))");
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#endif /* HAVE_OFF_T_SCALAR */
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#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
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putchar('\n');
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/*
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* print the dev_t size
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*/
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devlen = sizeof(buf.st_dev)*8;
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printf("#undef DEV_BITS\n");
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printf("#define DEV_BITS %d\n", devlen);
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#if CALC_BYTE_ORDER == BIG_ENDIAN
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/*
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* Big Endian
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*/
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if (devlen == 64) {
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printf("#define SWAP_HALF_IN_DEV(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B64(dest, src)");
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} else if (devlen == 32) {
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printf("#define SWAP_HALF_IN_DEV(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B32(dest, src)");
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} else if (devlen == 16) {
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printf("#define SWAP_HALF_IN_DEV(dest, src)\t\t%s\n",
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"(*(dest) = *(src))");
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} else {
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fprintf(stderr, "%s: unexpected st_dev bit size: %d\n",
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program, devlen);
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exit(3);
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}
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#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
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/*
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* Little Endian
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*
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* Normally a "(*(dest) = *(src))" would do, but on some
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* systems, a DEV is not a scalar hince we must memcpy.
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*/
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printf("#define SWAP_HALF_IN_DEV(dest, src)\t%s%d%s\n",
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"memcpy((void *)(dest), (void *)(src), sizeof(",devlen,"))");
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#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
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putchar('\n');
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/*
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* print the ino_t size
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*/
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inodelen = sizeof(buf.st_ino)*8;
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printf("#undef INODE_BITS\n");
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printf("#define INODE_BITS %d\n", inodelen);
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#if CALC_BYTE_ORDER == BIG_ENDIAN
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/*
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* Big Endian
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*/
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if (inodelen == 64) {
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printf("#define SWAP_HALF_IN_INODE(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B64(dest, src)");
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} else if (inodelen == 32) {
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printf("#define SWAP_HALF_IN_INODE(dest, src)\t\t%s\n",
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"SWAP_HALF_IN_B32(dest, src)");
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} else if (inodelen == 16) {
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printf("#define SWAP_HALF_IN_INODE(dest, src)\t\t%s\n",
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"(*(dest) = *(src))");
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} else {
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fprintf(stderr, "%s: unexpected st_ino bit size: %d\n",
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program, inodelen);
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exit(4);
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}
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#else /* CALC_BYTE_ORDER == BIG_ENDIAN */
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/*
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* Little Endian
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*
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* Normally a "(*(dest) = *(src))" would do, but on some
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* systems, a INODE is not a scalar hince we must memcpy.
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*/
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printf("#define SWAP_HALF_IN_INODE(dest, src)\t%s%d%s\n",
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"memcpy((void *)(dest), (void *)(src), sizeof(",inodelen,"))");
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#endif /* CALC_BYTE_ORDER == BIG_ENDIAN */
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/* exit(0); */
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return 0;
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}
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