spew a char to stdout

spew.c

/* 2018 Ralph Doncaster public domain software */
/* spew a char to stdout, null if none provided */

#include <unistd.h>
#include <string.h>

int main(int argc, char** argv){
    char buf[1024];
    char c = 0;
    if( argc > 1 ) c = *argv[1];
    memset( buf, c, sizeof(buf) );
    while( write(1, buf, sizeof(buf)) > 0 );
}