#include #include #include #define sflag(flag,val) printf("-D"#flag"=\"%s\" ", val) #define mflag(flag,val) printf("-D"#flag"=-%llu ", val + 1) #define iflag(flag,val) printf("-D"#flag"=%llu ", val) #define fflag(flag,val) printf("-D"#flag"=%Lf ", val) #define type_found(val) (found_type & (val / 8)) #define checkbits(type,x) \ if(!type_found(x) && sizeof(type) == (x/CHAR_BIT)) \ sflag(type_bit##x, #type), found_type |= (x / 8) #define describe_integral(type,label) { \ unsigned type maxval = -1; \ unsigned type smaxval = (maxval/2) - 1; \ iflag(type_max_u_##label, maxval); \ iflag(type_max_s_##label, smaxval); \ mflag(type_min_s_##label, smaxval); \ iflag(type_##label##_bits, (CHAR_BIT * sizeof(type))); \ checkbits(type, 8); else checkbits(type,16); else \ checkbits(type,32); else checkbits(type,64); else \ checkbits(type,128); else \ if (!found_sz && sizeof(type) == sizeof(size_t)) \ found_sz = 1, sflag(type_sz, "unsigned " #type); \ if (!found_ofs && sizeof(type) == sizeof(ptrdiff_t)) \ found_ofs = 1, sflag(type_offset, "signed " #type); \ } int main() { unsigned char etest[sizeof(int)] = {0xFF,0x00}; if ((*(int*)etest) == 0xFF) sflag(prop_endian,"low"); else sflag(prop_endian,"high"); int found_sz = 0, found_ofs = 0, found_type = 0; iflag(arch_byte_bits,CHAR_BIT); describe_integral(char,char); describe_integral(short,short); describe_integral(int,int); describe_integral(long,long); describe_integral(long long,llong); printf("\n"); return 0; }