usr/utils/readlink.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>

char *progname;

static __noreturn usage(void)
{
	fprintf(stderr, "Usage: %s link\n", progname);
	exit(1);
}

int main(int argc, char *argv[])
{
	const char *name;
	char link_name[PATH_MAX];
	int rv;

	progname = *argv++;

	name = *argv++;
	if (!name)
		usage();

	rv = readlink(name, link_name, sizeof link_name - 1);
	if (rv < 0) {
		perror(name);
		exit(1);
	}
	link_name[rv] = '\0';
	puts(link_name);
	exit(0);
}