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Improve file position handling on Big Engian machines

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Added swap_HALFs(dest, src, len) function to byteswap.c.

Calc can now handle Big Engian file position sizes that are a
multiple of BASEB bits in length.  Before handle Big Engian file
positions could only be 32 and 64 bits in length.  This will allow,
for example, a Big Engian file position size of 128 (assuming that
128/BASEB is is an integer).
This commit is contained in:
Landon Curt Noll
2022-11-28 15:13:16 -08:00
parent 3e084d9fb9
commit e6fc1a92a9
4 changed files with 61 additions and 4 deletions
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8
fposval.c
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@@ -96,7 +96,7 @@ main(int UNUSED(argc), char **argv)
/*
* print the file position information
*/
#if defined(HAVE_FPOS_POS)
#if defined(HAVE_FPOS_POS) && defined(FPOS_POS_BITS)
fileposlen = FPOS_POS_BITS;
#else /* ! HAVE_FPOS_POS */
# if defined(FPOS_BITS)
@@ -119,8 +119,12 @@ main(int UNUSED(argc), char **argv)
} else if (fileposlen == 32) {
printf("#define SWAP_HALF_IN_FILEPOS(dest, src)\t\t%s\n",
"SWAP_HALF_IN_B32(dest, src)");
} else if (fileposlen%BASEB == 0) {
printf("#define SWAP_HALF_IN_FILEPOS(dest, src)\t\t"
"swap_HALFs((HALF *)dest, (HALF *)src, (LEN)%d)\n",
fileposlen/BASEB);
} else {
fprintf(stderr, "%s: unexpected FILEPOS bit size: %d\n",
fprintf(stderr, "%s: unexpected BIG_ENDIAN FILEPOS bit size: %d\n",
program, fileposlen);
exit(1);
}