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@wxsBSD
Created Aug 22, 2021
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#include <ctype.h>
#include <stdio.h>

int main(void) {
  for (int i = 0; i <= 255; i++)
    printf("0x%02x %u\n", i, !isalnum(i));
  return 0;
}
0x00 1
0x01 1
0x02 1
0x03 1
0x04 1
0x05 1
0x06 1
0x07 1
0x08 1
0x09 1
0x0a 1
0x0b 1
0x0c 1
0x0d 1
0x0e 1
0x0f 1
0x10 1
0x11 1
0x12 1
0x13 1
0x14 1
0x15 1
0x16 1
0x17 1
0x18 1
0x19 1
0x1a 1
0x1b 1
0x1c 1
0x1d 1
0x1e 1
0x1f 1
0x20 1
0x21 1
0x22 1
0x23 1
0x24 1
0x25 1
0x26 1
0x27 1
0x28 1
0x29 1
0x2a 1
0x2b 1
0x2c 1
0x2d 1
0x2e 1
0x2f 1
0x30 0
0x31 0
0x32 0
0x33 0
0x34 0
0x35 0
0x36 0
0x37 0
0x38 0
0x39 0
0x3a 1
0x3b 1
0x3c 1
0x3d 1
0x3e 1
0x3f 1
0x40 1
0x41 0
0x42 0
0x43 0
0x44 0
0x45 0
0x46 0
0x47 0
0x48 0
0x49 0
0x4a 0
0x4b 0
0x4c 0
0x4d 0
0x4e 0
0x4f 0
0x50 0
0x51 0
0x52 0
0x53 0
0x54 0
0x55 0
0x56 0
0x57 0
0x58 0
0x59 0
0x5a 0
0x5b 1
0x5c 1
0x5d 1
0x5e 1
0x5f 1
0x60 1
0x61 0
0x62 0
0x63 0
0x64 0
0x65 0
0x66 0
0x67 0
0x68 0
0x69 0
0x6a 0
0x6b 0
0x6c 0
0x6d 0
0x6e 0
0x6f 0
0x70 0
0x71 0
0x72 0
0x73 0
0x74 0
0x75 0
0x76 0
0x77 0
0x78 0
0x79 0
0x7a 0
0x7b 1
0x7c 1
0x7d 1
0x7e 1
0x7f 1
0x80 1
0x81 1
0x82 1
0x83 1
0x84 1
0x85 1
0x86 1
0x87 1
0x88 1
0x89 1
0x8a 1
0x8b 1
0x8c 1
0x8d 1
0x8e 1
0x8f 1
0x90 1
0x91 1
0x92 1
0x93 1
0x94 1
0x95 1
0x96 1
0x97 1
0x98 1
0x99 1
0x9a 1
0x9b 1
0x9c 1
0x9d 1
0x9e 1
0x9f 1
0xa0 1
0xa1 1
0xa2 1
0xa3 1
0xa4 1
0xa5 1
0xa6 1
0xa7 1
0xa8 1
0xa9 1
0xaa 1
0xab 1
0xac 1
0xad 1
0xae 1
0xaf 1
0xb0 1
0xb1 1
0xb2 1
0xb3 1
0xb4 1
0xb5 1
0xb6 1
0xb7 1
0xb8 1
0xb9 1
0xba 1
0xbb 1
0xbc 1
0xbd 1
0xbe 1
0xbf 1
0xc0 1
0xc1 1
0xc2 1
0xc3 1
0xc4 1
0xc5 1
0xc6 1
0xc7 1
0xc8 1
0xc9 1
0xca 1
0xcb 1
0xcc 1
0xcd 1
0xce 1
0xcf 1
0xd0 1
0xd1 1
0xd2 1
0xd3 1
0xd4 1
0xd5 1
0xd6 1
0xd7 1
0xd8 1
0xd9 1
0xda 1
0xdb 1
0xdc 1
0xdd 1
0xde 1
0xdf 1
0xe0 1
0xe1 1
0xe2 1
0xe3 1
0xe4 1
0xe5 1
0xe6 1
0xe7 1
0xe8 1
0xe9 1
0xea 1
0xeb 1
0xec 1
0xed 1
0xee 1
0xef 1
0xf0 1
0xf1 1
0xf2 1
0xf3 1
0xf4 1
0xf5 1
0xf6 1
0xf7 1
0xf8 1
0xf9 1
0xfa 1
0xfb 1
0xfc 1
0xfd 1
0xfe 1
0xff 1
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