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https://github.com/lcn2/calc.git
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112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*
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* longlong - Determine the number if bits in a long long, if is exists
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*
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* usage:
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* longlong [bits]
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*
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* bits if empty or missing causes this prog to compute its length,
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* if 0, this prog will output nothing
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* otherwise this prog will assume it is the long long bit length
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*
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* Not all compilers support the long long type, so this may not compile
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* on your system.
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*
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* This prog outputs several defines:
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*
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* HAVE_LONGLONG
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* defined ==> ok to use long long
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* undefined ==> do not use long long, even if they exist
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*
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* LONGLONG_BITS
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* 0 ==> do not use long long, even if they exist
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* != 0 ==> bits in an unsigned long long
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*/
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/*
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* Copyright (c) 1995 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 "have_stdlib.h"
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#include "have_string.h"
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#if defined(HAVE_STRING_H)
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#include <string.h>
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#endif
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/*
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* have the compiler try its hand with unsigned and signed long longs
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*/
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unsigned long long val = 0x1234567890123456ULL;
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long long val2 = -1311768467284833366LL; /* -0x1234567890123456 */
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int
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main(int argc, char **argv)
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{
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int longlong_bits; /* bits in a long long, or <=0 => dont use */
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/*
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* parse args
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*/
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if (argc < 2) {
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/* no arg means compute the length */
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longlong_bits = sizeof(unsigned long long)*8;
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} else if (strcmp(argv[1], "") == 0) {
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/* empty arg means compute the length */
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longlong_bits = sizeof(unsigned long long)*8;
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} else {
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longlong_bits = atoi(argv[1]);
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}
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/*
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* length is preset, or 0 ==> do not use
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*/
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if (longlong_bits > 0) {
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/*
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* if size is longer than an unsigned long,
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* and the negative 'long long' works, then use long long's
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*/
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if (longlong_bits > sizeof(unsigned long)*8 && val2 < 0) {
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/* use long long length */
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printf("#define HAVE_LONGLONG\n");
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printf("#define LONGLONG_BITS %d /* yes */\n",
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longlong_bits);
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printf("\n/* does %%lld work or does %%ld? */\n");
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printf("#if defined(CHECK_L_FORMAT)\n");
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printf("long long l_format = %ld;\n", val);
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printf("#endif /* CHECK_L_FORMAT */\n");
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}
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}
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/* exit(0); */
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return 0;
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}
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