86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
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#if 0
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#
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# Compile with:
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# $sh byteorder.c
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#
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cc byteorder.c -o byteorder || exit 1
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echo successfully compiled
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exit
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#endif /* 0 */
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/*
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* $smu-mark$
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* $name: byteorder.c$
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* $author: Salvatore Sanfilippo <antirez@invece.org>$
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* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
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* $license: This software is under GPL version 2 of license$
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* $date: Fri Nov 5 11:55:47 MET 1999$
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* $rev: 9$
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*/
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/*
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* 0.1 first version
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* 0.2 add Strchr, so it's possibile remove string.h
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* 0.3 more portable thx to Pancrazio De Mauro 'TrantIT'!!!
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* 0.4 better debug output
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*/
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#include <stdio.h>
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char *Strchr(char *s, char c)
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{
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while(*s)
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if (*s++ == c)
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return s;
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return (char*) 0;
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}
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int main(int argc, char **argv)
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{
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unsigned int test = 1;
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unsigned char *x;
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int macro = 0, debug = 0, help = 0, j;
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for (j = 1; j < argc; j++) {
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if (Strchr(argv[j], 'm')) macro = 1;
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if (Strchr(argv[j], 'd')) debug = 1;
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if (Strchr(argv[j], 'h')) help = 1;
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}
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if (help) {
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printf( "-m macro output\n"
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"-d debug\n"
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"-h help\n");
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return 0;
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}
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x = (unsigned char*) &test;
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if (*x == 0x00) {
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if (macro)
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printf("__BIG_ENDIAN_BITFIELD\n");
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else
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printf("big endian\n");
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}
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else if (*x == 0x01) {
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if (macro)
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printf("__LITTLE_ENDIAN_BITFIELD\n");
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else
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printf("little endian\n");
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} else {
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printf("\nWARNING!!! byteorder exception\n\n");
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debug = 1;
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}
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if (debug) {
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printf("sizeof(unsigned int) = %d\n", sizeof(unsigned int));
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printf("unsigned int test = 1;\n");
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printf("in memory as: ");
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for (j = 0; j < sizeof(unsigned int); j++)
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printf("%02x ", x[j]);
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printf("\n");
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}
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return 0;
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}
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