BSD 4_2 release

[unix-history] / usr / src / lib / libc / gen / perror.c

/* @(#)perror.c 4.2 (Berkeley) 6/30/83 */
/*
* Print the error indicated
* in the cerror cell.
*/
#include <sys/types.h>
#include <sys/uio.h>

int     errno;
int     sys_nerr;
char    *sys_errlist[];
perror(s)
       char *s;
{
       struct iovec iov[4];
       register struct iovec *v = iov;

       if (s && *s) {
               v->iov_base = s;
               v->iov_len = strlen(s);
               v++;
               v->iov_base = ": ";
               v->iov_len = 2;
               v++;
       }
       v->iov_base = errno < sys_nerr ? sys_errlist[errno] : "Unknown error";
       v->iov_len = strlen(v->iov_base);
       v++;
       v->iov_base = "\n";
       v->iov_len = 1;
       writev(2, iov, (v - iov) + 1);
}