ci2/tests/01_ci2_static_assert.c

/* - | Copyright | --------------------------------------------------------------
   Copyright (c) 2026 Randy Jordan

Permission is hereby granted, free of charge, to any person obtaining a copy of 
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of the Software, and to permit persons to whom the Software is furnished to do 
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all 
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
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SOFTWARE.

 * --------------------------------------------------------------------------*/
#define DEBUG
#include "../include/ci2.h"
#include <stdlib.h>
#include <limits.h>     /* INT_MAX, CHAR_BIT             — C standard */
#include <float.h>      /* FLT_MANT_DIG                  — C standard */

int main(void){ 
    /* Fundamental type sizes that almost all C code silently assumes. */
    CI2_STATIC_ASSERT(CHAR_BIT       == 8);
    CI2_STATIC_ASSERT(sizeof(char)   == 1);
    CI2_STATIC_ASSERT(sizeof(short)  == 2);
    CI2_STATIC_ASSERT(sizeof(int)    == 4);
    CI2_STATIC_ASSERT(sizeof(float)  == 4);
    CI2_STATIC_ASSERT(sizeof(double) == 8);

    /* Pointer and size_t width — catches ILP64 oddities. */
    CI2_STATIC_ASSERT(sizeof(void *) == sizeof(size_t));

    /* Fixed-width types from <stdint.h> */
    CI2_STATIC_ASSERT(sizeof(int8_t)  == 1);
    CI2_STATIC_ASSERT(sizeof(int16_t) == 2);
    CI2_STATIC_ASSERT(sizeof(int32_t) == 4);
    CI2_STATIC_ASSERT(sizeof(int64_t) == 8);
    
    CI2_STATIC_ASSERT(sizeof(int8_t)  == 1);
    CI2_STATIC_ASSERT(sizeof(int16_t) == 2);
    CI2_STATIC_ASSERT(sizeof(int32_t) == 4);
    CI2_STATIC_ASSERT(sizeof(int64_t) == 8);

    /* IEEE-754 single precision: 24 significand bits. */
    CI2_STATIC_ASSERT(FLT_MANT_DIG == 24);

    return EXIT_SUCCESS;
}