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2b506a74e7
On ancient 32 bit big endian machines (e.g. MIPS) file.c fails to build
when FILEPOS is a struct and not a scalar. This happens because the
SWAP_HALF_IN_FILEPOS macro essentially expands to a simple assignment in
this case but the types are incompatile (HALF and FILEPOS).
Detailed compile error (this is from an older version so line numbers might
be wrong but the error is the same):
gcc -DCALC_SRC -DCUSTOM -Wall -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -O3 -g3 -Wno-error=long-long -Wno-long-long -c file.c
In file included from qmath.h:32,
from cmath.h:32,
from value.h:33,
from calc.h:33,
from file.c:39:
file.c: In function 'filepos2z':
zmath.h:85:46: error: incompatible types when assigning to type 'HALF' {aka 'long unsigned int'} from type 'FILEPOS' {aka 'struct _G_fpos_t'}
#define SWAP_HALF_IN_B32(dest, src) (*(dest) = *(src))
^
fposval.h:15:42: note: in expansion of macro 'SWAP_HALF_IN_B32'
#define SWAP_HALF_IN_FILEPOS(dest, src) SWAP_HALF_IN_B32(dest, src)
^~~~~~~~~~~~~~~~
file.c:1370:2: note: in expansion of macro 'SWAP_HALF_IN_FILEPOS'
SWAP_HALF_IN_FILEPOS(ret.v, &pos);
^~~~~~~~~~~~~~~~~~~~
Fix this by adding suitable casts to the definition of SWAP_HALF_IN_FILEPOS
on big endian machines. Strictly speaking, the casts only seem to be
necessary when using SWAP_HALF_IN_B32, but they can't hurt in the other
cases either.
288 lines
8.7 KiB
C
288 lines
8.7 KiB
C
/*
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* fposval - Determine information about the file position type
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*
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* Copyright (C) 1999,2021,2023 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1994/11/05 03:19:52
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* File existed as early as: 1994
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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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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* FILEPOS_LEN length in octets 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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* OFF_T_LEN length in octets 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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* DEV_LEN 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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* INODE_LEN length in octets 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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#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_string.h"
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#include "decl.h"
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#include "have_fgetsetpos.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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#include "have_fpos_pos.h"
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#include "alloc.h"
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#include "have_unused.h"
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#include "have_memmv.h"
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#include "zmath.h"
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#include "banned.h" /* include after system header <> includes */
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char *program; /* our name */
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int
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main(int UNUSED(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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#if defined(HAVE_FPOS_POS) && defined(FPOS_POS_BITS)
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fileposlen = FPOS_POS_BITS;
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#else /* ! HAVE_FPOS_POS */
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# if defined(FPOS_BITS)
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fileposlen = FPOS_BITS;
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# else
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fileposlen = sizeof(FILEPOS)*8;
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# endif
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#endif /* ! HAVE_FPOS_POS */
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printf("#undef FILEPOS_BITS\n");
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printf("#define FILEPOS_BITS %d\n", fileposlen);
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printf("#undef FILEPOS_LEN\n");
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printf("#define FILEPOS_LEN %d\n", fileposlen/8);
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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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/*
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* Use casts to (HALF *) because SWAP_HALF_IN_B* might expand to
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* a simple assignment and SWAP_HALF_IN_FILEPOS might get a
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* (HALF *) and a (FILEPOS *) which are not assignment-compatible.
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*/
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if (fileposlen == 64) {
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
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"\tSWAP_HALF_IN_B64((HALF *)dest, (HALF *)src)\n");
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} else if (fileposlen == 32) {
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
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"\tSWAP_HALF_IN_B32((HALF *)dest, (HALF *)src)\n");
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} else if (fileposlen%BASEB == 0) {
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
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"\tswap_HALFs((HALF *)dest, (HALF *)src, %d)\n",
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fileposlen/BASEB);
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} else {
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fprintf(stderr, "%s: unexpected BIG_ENDIAN 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) \\\n"
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"\t(*(dest) = *(src))\n");
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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 hence we must memcpy.
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*/
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printf("#define SWAP_HALF_IN_FILEPOS(dest, src) \\\n"
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"\tmemcpy((void *)(dest), (void *)(src), FILEPOS_LEN)\n");
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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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#if defined(OFF_T_BITS)
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stsizelen = OFF_T_BITS;
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#else
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stsizelen = sizeof(buf.st_size)*8;
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#endif
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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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printf("#undef OFF_T_LEN\n");
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printf("#define OFF_T_LEN %d\n", stsizelen/8);
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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 hence 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 hence 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), ", stsizelen/8, ")");
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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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#if defined(DEV_BITS)
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devlen = DEV_BITS;
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#else
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devlen = sizeof(buf.st_dev)*8;
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#endif
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printf("#undef DEV_BITS\n");
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printf("#define DEV_BITS %d\n", devlen);
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printf("#undef DEV_LEN\n");
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printf("#define DEV_LEN %d\n", devlen/8);
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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 hence 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), ", devlen/8, ")");
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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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#if defined(INODE_BITS)
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inodelen = INODE_BITS;
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#else
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inodelen = sizeof(buf.st_ino)*8;
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#endif
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printf("#undef INODE_BITS\n");
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printf("#define INODE_BITS %d\n", inodelen);
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printf("#undef INODE_LEN\n");
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printf("#define INODE_LEN %d\n", inodelen/8);
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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 hence 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), ", inodelen/8, ")");
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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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