Call xxd/hexdump from C

hexdump.h

#ifndef HEXDUMP_H
#define HEXDUMP_H

#include <stdlib.h>
#include <stdio.h>

#include <unistd.h>
#include <sys/wait.h>

void hexdump(char* data, size_t size) {
    int fd[2];
    pid_t pid;
    char buf[128];

    if (pipe(fd) == -1) {
        perror("pipe");
        exit(1);
    }

    pid = fork();
    if (pid == -1) {
        perror("fork");
        exit(1);
    }

    if (pid == 0) {
        close(fd[1]);
        dup2(fd[0], STDIN_FILENO);

        char *args[] = {"xxd", NULL};
        execvp("xxd", args);

        perror("exec");
        exit(1);
    } else {
        close(fd[0]);

        if (write(fd[1], data, size) == -1) {
            perror("write");
        } 

        close(fd[1]); 
        wait(NULL);
    }
}

#endif // HEXDUMP_H