/* Report Unix errors */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

int main(int argc, char *argv[])
{
    int f,n;
    char *p;

    if (argc == 1)
    {
	fprintf(stderr,"%s:usage %s -t|err1 [.. errn]\n",argv[0],argv[0]);
	exit(EXIT_FAILURE);
    }

    if (!strcmp(argv[1],"-t"))
    {
	errno = 0;

	for(f = 0; errno != EINVAL && f < 256; f++)
	{
	    errno = 0;
	    p = strerror(f);

	    if (errno != EINVAL)
	    {
		printf("%3d : %s\n",f,p);
	    }
	}
    }
    else
    {
	for(f=1;f<argc;f++)
	{
	    n=strtol(argv[f],(char **)NULL,0);

	    errno = 0;

	    p = strerror(n);

	    if (errno == EINVAL)
	    {
		fprintf(stderr,"%s:errcode %d invalid!\n",argv[0],n);
	    }
	    else
	    {
		printf("%3d : %s\n",n,p);
	    }
	}
    }

    return EXIT_SUCCESS;
}