Using strcspn to process control character delimiters

using-strcspn.c

#include <stdio.h>
#include <string.h>

void
process(const char *input)
{
    const char delim[] = { 0x0b, 0x1c, 0x0d, 0 };
    int count = 0;
    
    while (input[0] != '\0') {
        size_t n = strcspn(input, delim);
        
        printf("piece[%d] type=%#x: \"%.*s\"\n", ++count, input[n], n, input);
        if (input[n]) {
            n++; /* move past the delim we found, don't move if we hit nul terminator */
        }
        input += n;
    }
}

int
main(int argc, char *argv[])
{
    
    if (argc > 1) {
        int i;
        for (i = 1; i < argc; i++) {
          process(argv[i]);
        }
    } else {
        process("This is\x0d""a test\x0b wow \x1c\x1c!");
    }
    return 0;
}