/*
 * chk_c - chk C compiler and C include for calc requirements
 *
 * This program, to successfully compile, must include:
 *
 *	#include <stdint.h>
 *	#include <inttypes.h>
 *
 * and must be able to compile all of these types:
 *
 *	int8_t		uint8_t
 *	int16_t		uint16_t
 *	int32_t		uint32_t
 *	int64_t		uint64_t
 *	intmax_t	uintmax_t
 *
 * be able to sum values from all of those files,
 * plus the INTX_C(val) and UINTX_C(val) composing macros,
 * and be able to print for signed and unsigned 32-bit, 64-bit and max-bit values.
 *
 * If you are unable to compile this program, or if this program when
 * compiles does not exit 0, then your C compiler and/or C include
 * fails to meet calc requirements.
 *
 * Compilers that are at least c99 MUST be able to compile this program
 * such that when run will exit 0.
 *
 * Copyright (C) 2023  Landon Curt Noll
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * Calc is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
 * Public License for more details.
 *
 * A copy of version 2.1 of the GNU Lesser General Public License is
 * distributed with calc under the filename COPYING-LGPL.  You should have
 * received a copy with calc; if not, write to Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Under source code control:	2023/08/20 23:57:50
 * File existed as early as:	2023
 *
 * chongo <was here> /\oo/\	http://www.isthe.com/chongo/
 * Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
 */

#include <stdio.h>
#include <unistd.h>

#include "have_stdint.h"
#if defined(HAVE_STDINT_H)
#include <stdint.h>
#endif /* HAVE_STDINT_H */

#include "have_inttypes.h"
#if defined(HAVE_INTTYPES_H)
#include <inttypes.h>
#endif /* HAVE_INTTYPES_H */

#include "have_stdlib.h"
#if defined(HAVE_STDLIB_H)
#include <stdlib.h>
#endif /* HAVE_STDLIB_H */

#include "bool.h"


/*
 * our version
 */
#define CHK_C_VERSION "1.0 2023-08-20"


/*
 * usage:
 */
static char const *usage =
    "usage: %s [-h] [-c] [-V]\n"
    "\n"
    "\t-h\t\toutput this message and exit\n"
    "\t-c\t\toutput C compiler and C include info (def: no stdout output)\n"
    "\t-V\t\tprint version string and exit\n"
    "\n"
    "Exit codes:\n"
    "     0   all OK\n"
    "     1   C compiler and C include is insufficient for calc\n"
    "     2   -h and help string printed or -V and version string printed\n"
    "     3   invalid command line, invalid option or option missing an argument\n"
    " >= 10   internal error\n"
    "\n"
    "chk_c version: %s\n";


#include "banned.h"	/* include after system header <> includes */


int
main(int argc, char *argv[])
{
    char *program = "((NULL))";		/* our name */
    int opt;				/* the -option found or -1 */
    bool c_flag = false;		/* if -h was found */
#if defined(HAVE_STDINT_H) && defined(HAVE_INTTYPES_H)
    int i = -1;				/* signed int test value */
    unsigned int ui = 1;		/* unsigned int test value */
    long l = -2L;			/* signed long test value */
    unsigned long ul = 2UL;		/* unsigned long test value */
    long long ll = -4LL;		/* signed long long test value */
    unsigned long long ull = 4ULL;	/* unsigned long long test value */
    int8_t i8 = INT8_C(-8);		/* signed 8-bit test value */
    uint8_t ui8 = UINT8_C(8);		/* unsigned 8-bit test value */
    int16_t i16 = INT16_C(-16);		/* signed 16-bit test value */
    uint16_t ui16 = UINT16_C(16);	/* unsigned 16-bit test value */
    int32_t i32 = INT32_C(-32);		/* signed 32-bit test value */
    uint32_t ui32 = UINT32_C(32);	/* unsigned 32-bit test value */
    int64_t i64 = INT64_C(-64);		/* signed 64-bit test value */
    uint64_t ui64 = UINT64_C(64);	/* unsigned 64-bit test value */
    intmax_t imax = INTMAX_C(-256);	/* maximum sized signed int test value */
    uintmax_t uimax = UINTMAX_C(256);	/* maximum sized unsigned int test value */
    uintmax_t isum = 0;		/* sum of all test values as signed value */
    uintmax_t uisum = 0;	/* sum of all test values as unsigned value */
#endif /* HAVE_STDINT_H && HAVE_INTTYPES_H */

    /*
     * parse args
     */
    program = argv[0];
    while ((opt = getopt(argc, argv, "hcV")) != -1) {
	switch (opt) {
	case 'h':
	    fprintf(stderr, usage, program, CHK_C_VERSION);
	    exit(2);
	    break;
	case 'c':
	    c_flag = true;
	    break;
	case 'V':
	    printf("%s\n", CHK_C_VERSION);
	    exit(2);
	    break;
        default:
	    fprintf(stderr, usage, program, CHK_C_VERSION);
	    exit(3);
	}
    }
    if (optind != argc) {
	fprintf(stderr, usage, program, CHK_C_VERSION);
	exit(3);
    }

    /*
     * must have <stdint.h>
     */
#if !defined(HAVE_STDINT_H)
    if (c_flag == true) {
	 printf("HAVE_STDINT_H is undefined\n");
    }
    fprintf(stderr, "calc requires <stdint.h> include file\n");
    exit(1);
#else /* HAVE_STDINT_H */
    if (c_flag == true) {
	printf("HAVE_STDINT_H is defined\n");
	printf("<stdint.h> successfully included\n");
    }

    /*
     * must have <inttypes.h>
     */
#if !defined(HAVE_INTTYPES_H)
    if (c_flag == true) {
	 printf("HAVE_INTTYPES_H is undefined\n");
    }
    fprintf(stderr, "calc requires <inttypes.h> include file\n");
    exit(1);
#else /* HAVE_INTTYPES_H */
    if (c_flag == true) {
	printf("\nHAVE_INTTYPES_H is defined\n");
	printf("<inttypes.h> successfully included\n");
    }

    /*
     * check for __STDC__ defined
     */
#if !defined(__STDC__)
    fprintf(stderr, "__STDC__ is not defined\n");
    exit(1);
#endif /* __STDC__ */
    if (c_flag == true) {
	printf("\n__STDC__ is defined\n");
    }

    /*
     * check for __STDC_VERSION__ defined
     */
#if !defined(__STDC__)
    fprintf(stderr, "__STDC_VERSION__ is not defined\n");
    exit(1);
#endif /* __STDC_VERSION__ */
    if (c_flag == true) {
	printf("__STDC_VERSION__: %ld is defined\n", __STDC_VERSION__);
    }

    /*
     * check for __STDC_VERSION__ >= 199901L for c99 or later
     */
#if __STDC_VERSION__ < 199901L
    fprintf(stderr, "__STDC_VERSION__: %ld < 199901L\n", __STDC_VERSION__);
    exit(1);
#endif /* __STDC_VERSION__ >= 199901L */
    if (c_flag == true) {
	printf("__STDC_VERSION__: %ld >= 199901L\n", __STDC_VERSION__);
    }

    /*
     * calculate sum of all test values as signed value
     */
    isum = i + ui + l + ul + ll + ull + i8 + ui8 + i16 + ui16 + i32 + ui32 + i64 + ui64 + imax + uimax;
    if (c_flag == true) {
	printf("\nzero valued isum: %jd\n", isum);
    }
    if (isum != 0) {
	fprintf(stderr, "failed to add all required integer types into a signed value\n");
	exit(1);
    }

    /*
     * calculate sum of all test values as unsigned value
     */
    uisum = i + ui + l + ul + ll + ull + i8 + ui8 + i16 + ui16 + i32 + ui32 + i64 + ui64 + imax + uimax;
    if (c_flag == true) {
	printf("zero valued uisum: %ju\n", uisum);
    }
    if (uisum != 0) {
	fprintf(stderr, "failed to add all required integer types into an unsigned value\n");
	exit(1);
    }

    /*
     * verify various 32, 64 and max PRI macros as well as MIN and MAX constants
     */
    if (c_flag == true) {
	printf("\nsigned integer MIN and MAX\n");
	printf("INT32_MIN: %+"PRId32"\n", INT32_MIN);
	printf("INT32_MAX: %+"PRId32"\n", INT32_MAX);
	printf("INT64_MIN: %+"PRId64"\n", INT64_MIN);
	printf("INT64_MAX: %+"PRId64"\n", INT64_MAX);
	printf("INTMAX_MIN: %+"PRIdMAX"\n", INTMAX_MIN);
	printf("INTMAX_MAX: %+"PRIdMAX"\n", INTMAX_MAX);

	printf("\nunsigned integer MAX\n");
	printf("UINT32_MAX: %"PRIu32"\n", UINT32_MAX);
	printf("UINT64_MAX: %"PRIu64"\n", UINT64_MAX);
	printf("UINTMAX_MAX: %"PRIuMAX"\n", UINTMAX_MAX);

	printf("\ninteger MIN and MAX\n");
	printf("INT32_MIN: %"PRIi32"\n", INT32_MIN);
	printf("INT32_MAX: %"PRIi32"\n", INT32_MAX);
	printf("INT64_MIN: %"PRIi64"\n", INT64_MIN);
	printf("INT64_MAX: %"PRIi64"\n", INT64_MAX);
	printf("INTMAX_MIN: %"PRIiMAX"\n", INTMAX_MIN);
	printf("INTMAX_MAX: %"PRIiMAX"\n", INTMAX_MAX);

	printf("\noctal MIN and MAX\n");
	printf("INT32_MIN: %"PRIo32"\n", INT32_MIN);
	printf("INT32_MAX: %"PRIo32"\n", INT32_MAX);
	printf("INT64_MIN: %"PRIo64"\n", INT64_MIN);
	printf("INT64_MAX: %"PRIo64"\n", INT64_MAX);
	printf("INTMAX_MIN: %"PRIoMAX"\n", INTMAX_MIN);
	printf("INTMAX_MAX: %"PRIoMAX"\n", INTMAX_MAX);

	printf("\nhex MIN and MAX\n");
	printf("INT32_MIN: %"PRIx32"\n", INT32_MIN);
	printf("INT32_MAX: %"PRIx32"\n", INT32_MAX);
	printf("INT64_MIN: %"PRIx64"\n", INT64_MIN);
	printf("INT64_MAX: %"PRIx64"\n", INT64_MAX);
	printf("INTMAX_MIN: %"PRIxMAX"\n", INTMAX_MIN);
	printf("INTMAX_MAX: %"PRIxMAX"\n", INTMAX_MAX);

	printf("\nHEX MIN and MAX\n");
	printf("INT32_MIN: %"PRIX32"\n", INT32_MIN);
	printf("INT32_MAX: %"PRIX32"\n", INT32_MAX);
	printf("INT64_MIN: %"PRIX64"\n", INT64_MIN);
	printf("INT64_MAX: %"PRIX64"\n", INT64_MAX);
	printf("INTMAX_MIN: %"PRIXMAX"\n", INTMAX_MIN);
	printf("INTMAX_MAX: %"PRIXMAX"\n", INTMAX_MAX);

	printf("\nsizes\n");
	printf("sizeof(int8_t): %lu\n", sizeof(int8_t));
	printf("sizeof(uint8_t): %lu\n", sizeof(uint8_t));
	printf("sizeof(int16_t): %lu\n", sizeof(int16_t));
	printf("sizeof(uint16_t): %lu\n", sizeof(uint16_t));
	printf("sizeof(int32_t): %lu\n", sizeof(int32_t));
	printf("sizeof(uint32_t): %lu\n", sizeof(uint32_t));
	printf("sizeof(int64_t): %lu\n", sizeof(int64_t));
	printf("sizeof(uint64_t): %lu\n", sizeof(uint64_t));
	printf("sizeof(intmax_t): %lu\n", sizeof(intmax_t));
	printf("sizeof(uintmax_t): %lu\n", sizeof(uintmax_t));
    }

    /*
     * All Done!! -- Jessica Noll, age 2
     */
    if (c_flag == true) {
	printf("\nC compiler and C include appears to support calc\n");
    }
    exit(0);
#endif /* HAVE_INTTYPES_H */
#endif /* HAVE_STDINT_H */
}