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Diffstat (limited to 'mcon/U/charorder.U')
| -rw-r--r-- | mcon/U/charorder.U | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/mcon/U/charorder.U b/mcon/U/charorder.U new file mode 100644 index 0000000..8ed5428 --- /dev/null +++ b/mcon/U/charorder.U @@ -0,0 +1,143 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic Licence, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic Licence; a copy of which may be found at the root +?RCS: of the source tree for dist 4.0. +?RCS: +?RCS: $Log: charorder.U,v $ +?RCS: Revision 3.0.1.1 1994/10/29 16:07:08 ram +?RCS: patch36: added ?F: line for metalint file checking +?RCS: +?RCS: Revision 3.0 1993/08/18 12:05:33 ram +?RCS: Baseline for dist 3.0 netwide release. +?RCS: +?MAKE:chorder_int chorder_short chorder_long: Myread cat +cc +ccflags rm +?MAKE: -pick add $@ %< +?S:chorder_short (d_cos d_bos): +?S: Holds the value describing the byte ordering of characters in a short. +?S: On a Big-Endian machine, that would be "c0c1". +?S:. +?S:chorder_int (charoder): +?S: Holds the value describing the byte ordering of characters in an int. +?S: For instance, on a Big-Endian machine, this would be: "c0c1c2c3". +?S:. +?S:chorder_long (d_col d_bol): +?S: Holds the value describing the byte ordering of characters in a long. +?S: On a 64 bits Big-Endian machine, that would yield: "c0c1c2c3c4c5c6c7". +?S:. +?C:CHAR_ORDER_SHORT: +?C: Holds the byte ordering of characters in a short. It's a string +?C: value like "c0c1" on a Big-Endian machine. +?C:. +?C:CHAR_ORDER_INT: +?C: Holds the byte ordering of characters in an int. It's a string +?C: value like "c0c1c2c3" on a Big-Endian machine. +?C:. +?C:CHAR_ORDER_LONG: +?C: Holds the byte ordering of characters in a long. It's a string +?C: value like "c0c1c2c3c4c5c6c7" on a 64 bits Big-Endian machine. +?C:. +?H:#define CHAR_ORDER_SHORT "$chorder_short" /* byte order in a short */ +?H:#define CHAR_ORDER_INT "$chorder_int" /* byte order in an int */ +?H:#define CHAR_ORDER_LONG "$chorder_long" /* byte order in a long */ +?H:. +?F:!byteorder +: check for character ordering +echo " " +echo "Checking out byte order..." >&4 +$cat >byteorder.c <<'EOCP' +#include <stdio.h> + +main(argc, argv) + int argc; + char *argv[]; { + int i; + int max; + union { + short u_s; + int u_i; + long u_l; + char u_c[sizeof(long)]; + } u; + switch (argv[1][0]) { + case 'l': + u.u_l = 0L; + /* HMS: ASSERT: sizeof(long) < 10. */ + for(i = 0; i < sizeof(long); ++i) { + u.u_l *= 0x100L; + u.u_l += (0xc0 + i); + } + max = sizeof(long); + break; + case 's': + u.u_s = 0; + /* HMS: ASSERT: sizeof(short) < 10. */ + for(i = 0; i < sizeof(short); ++i) { + u.u_s *= 0x100L; + u.u_s += (0xc0 + i); + } + max = sizeof(short); + break; + case 'i': + u.u_i = 0; + /* RAM: ASSERT: sizeof(int) < 10. */ + for(i = 0; i < sizeof(int); ++i) { + u.u_l *= 0x100L; + u.u_l += (0xc0 + i); + } + max = sizeof(int); + break; + default: + max = 0; + break; + } + for(i = 0; i < max; i++) { + printf("%x", u.u_c[i] & 0x00FF); + } + printf("\n"); + exit(0); +} +EOCP +if $cc $ccflags -o byteorder byteorder.c >/dev/null 2>&1 ; then + : null statement +@if chorder_short + chorder_short=`./byteorder s` +@end +@if chorder_int + chorder_int=`./byteorder i` +@end +@if chorder_long + chorder_long=`./byteorder l` +@end +else + $cat <<EOM +(I can't seem to get my test program to work. Guessing 32 bits big-endian.) +EOM + chorder_short="c0c1" + chorder_int="c0c1c2c3" + chorder_long="c0c1c2c3" +fi +@if chorder_short +dflt=$chorder_short +rp='What is the order of characters in a short?' +. ./myread +chorder_short="$ans" +@end +@if chorder_int +dflt=$chorder_int +rp='What is the order of characters in an int?' +. ./myread +chorder_int="$ans" +@end +@if chorder_long +dflt=$chorder_long +rp='What is the order of characters in a long?' +. ./myread +chorder_long="$ans" +@end +$rm -f byteorder* core + |