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/*

FUNCTION

<<perror>>---print an error message on standard error

INDEX

        perror

INDEX

        _perror_r

ANSI_SYNOPSIS

        #include <stdio.h>

        void perror(char *<[prefix]>);

        void _perror_r(void *<[reent]>, char *<[prefix]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        void perror(<[prefix]>)

        char *<[prefix]>;

        void _perror_r(<[reent]>, <[prefix]>)

        char *<[reent]>;

        char *<[prefix]>;

DESCRIPTION

Use <<perror>> to print (on standard error) an error message

corresponding to the current value of the global variable <<errno>>.

Unless you use <<NULL>> as the value of the argument <[prefix]>, the

error message will begin with the string at <[prefix]>, followed by a

colon and a space (<<: >>). The remainder of the error message is one

of the strings described for <<strerror>>.

The alternate function <<_perror_r>> is a reentrant version.  The

extra argument <[reent]> is a pointer to a reentrancy structure.

RETURNS

<<perror>> returns no result.

PORTABILITY

ANSI C requires <<perror>>, but the strings issued vary from one

implementation to another.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,

<<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#include <stddef.h>

#include <stdio.h>

#include <string.h>

void

_DEFUN (_perror_r, (ptr, s),

        struct _reent *ptr _AND

        _CONST char *s)

{

  char *error;

  if (s != NULL && *s != '\0')

    {

      fputs (s, _stderr_r (ptr));

      fputs (": ", _stderr_r (ptr));

    }

  if ((error = strerror (ptr->_errno)) != NULL)

    fputs (error, _stderr_r (ptr));

  fputc ('\n', _stderr_r (ptr));

}

#ifndef _REENT_ONLY

void

_DEFUN (perror, (s),

        _CONST char *s)

{

  _perror_r (_REENT, s);

}

#endif