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/***
**** CAUTION!!! KEEP DOC CONSISTENT---if you change text of a message
****            here, change two places:
****            1) the leading doc section (alphabetized by macro)
****            2) the real text inside switch(errnum)
***/
 
/*
FUNCTION
	<<strerror>>---convert error number to string
 
INDEX
	strerror
 
ANSI_SYNOPSIS
	#include <string.h>
	char *strerror(int <[errnum]>);
 
TRAD_SYNOPSIS
	#include <string.h>
	char *strerror(<[errnum]>)
	int <[errnum]>;
 
DESCRIPTION
<<strerror>> converts the error number <[errnum]> into a
string.  The value of <[errnum]> is usually a copy of <<errno>>.
If <<errnum>> is not a known error number, the result points to an
empty string.
 
This implementation of <<strerror>> prints out the following strings
for each of the values defined in `<<errno.h>>':
 
o+
o E2BIG
Arg list too long
 
o EACCES
Permission denied
 
o EADV
Advertise error
 
o EAGAIN
No more processes
 
o EBADF
Bad file number
 
o EBADMSG
Bad message
 
o EBUSY
Device or resource busy
 
o ECHILD
No children
 
o ECOMM
Communication error
 
o EDEADLK
Deadlock
 
o EEXIST
File exists
 
o EDOM
Math argument
 
o EFAULT
Bad address
 
o EFBIG
File too large
 
o EIDRM
Identifier removed
 
o EINTR
Interrupted system call
 
o EINVAL
Invalid argument
 
o EIO
I/O error
 
o EISDIR
Is a directory
 
o ELIBACC
Cannot access a needed shared library
 
o ELIBBAD
Accessing a corrupted shared library
 
o ELIBEXEC
Cannot exec a shared library directly
 
o ELIBMAX
Attempting to link in more shared libraries than system limit
 
o ELIBSCN
<<.lib>> section in a.out corrupted
 
o EMFILE
Too many open files
 
o EMLINK
Too many links
 
o EMULTIHOP
Multihop attempted
 
o ENAMETOOLONG
File or path name too long
 
o ENFILE
Too many open files in system
 
o ENODEV
No such device
 
o ENOENT
No such file or directory
 
o ENOEXEC
Exec format error
 
o ENOLCK
No lock
 
o ENOLINK
Virtual circuit is gone
 
o ENOMEM
Not enough space
 
o ENOMSG
No message of desired type
 
o ENONET
Machine is not on the network
 
o ENOPKG
No package
 
o ENOSPC
No space left on device
 
o ENOSR
No stream resources
 
o ENOSTR
Not a stream
 
o ENOSYS
Function not implemented
 
o ENOTBLK
Block device required
 
o ENOTDIR
Not a directory
 
o ENOTEMPTY
Directory not empty
 
o ENOTTY
Not a character device
 
o ENXIO
No such device or address
 
o EPERM
Not owner
 
o EPIPE
Broken pipe
 
o EPROTO
Protocol error
 
o ERANGE
Result too large
 
o EREMOTE
Resource is remote
 
o EROFS
Read-only file system
 
o ESPIPE
Illegal seek
 
o ESRCH
No such process
 
o ESRMNT
Srmount error
 
o ETIME
Stream ioctl timeout
 
o ETXTBSY
Text file busy
 
o EXDEV
Cross-device link
 
o-
 
RETURNS
This function returns a pointer to a string.  Your application must
not modify that string.
 
PORTABILITY
ANSI C requires <<strerror>>, but does not specify the strings used
for each error number.
 
Although this implementation of <<strerror>> is reentrant, ANSI C
declares that subsequent calls to <<strerror>> may overwrite the
result string; therefore portable code cannot depend on the reentrancy
of this subroutine.
 
This implementation of <<strerror>> provides for user-defined
extensibility.  <<errno.h>> defines <[__ELASTERROR]>, which can be
used as a base for user-defined error values.  If the user supplies a
routine named <<_user_strerror>>, and <[errnum]> passed to
<<strerror>> does not match any of the supported values,
<<_user_strerror>> is called with <[errnum]> as its argument.
 
<<_user_strerror>> takes one argument of type <[int]>, and returns a
character pointer.  If <[errnum]> is unknown to <<_user_strerror>>,
<<_user_strerror>> returns <[NULL]>.  The default <<_user_strerror>>
returns <[NULL]> for all input values.
 
<<strerror>> requires no supporting OS subroutines.
 
QUICKREF
	strerror ansi pure
*/
 
#include <errno.h>
#include <string.h>
 
char *
_DEFUN (strerror, (errnum),
	int errnum)
{
  char *error;
  extern char *_user_strerror _PARAMS ((int));
 
  switch (errnum)
    {
/* go32 defines EPERM as EACCES */
#if defined (EPERM) && (!defined (EACCES) || (EPERM != EACCES))
    case EPERM:
      error = "Not owner";
      break;
#endif
#ifdef ENOENT
    case ENOENT:
      error = "No such file or directory";
      break;
#endif
#ifdef ESRCH
    case ESRCH:
      error = "No such process";
      break;
#endif
#ifdef EINTR
    case EINTR:
      error = "Interrupted system call";
      break;
#endif
#ifdef EIO
    case EIO:
      error = "I/O error";
      break;
#endif
/* go32 defines ENXIO as ENODEV */
#if defined (ENXIO) && (!defined (ENODEV) || (ENXIO != ENODEV))
    case ENXIO:
      error = "No such device or address";
      break;
#endif
#ifdef E2BIG
    case E2BIG:
      error = "Arg list too long";
      break;
#endif
#ifdef ENOEXEC
    case ENOEXEC:
      error = "Exec format error";
      break;
#endif
#ifdef EBADF
    case EBADF:
      error = "Bad file number";
      break;
#endif
#ifdef ECHILD
    case ECHILD:
      error = "No children";
      break;
#endif
#ifdef EAGAIN
    case EAGAIN:
      error = "No more processes";
      break;
#endif
#ifdef ENOMEM
    case ENOMEM:
      error = "Not enough space";
      break;
#endif
#ifdef EACCES
    case EACCES:
      error = "Permission denied";
      break;
#endif
#ifdef EFAULT
    case EFAULT:
      error = "Bad address";
      break;
#endif
#ifdef ENOTBLK
    case ENOTBLK:
      error = "Block device required";
      break;
#endif
#ifdef EBUSY
    case EBUSY:
      error = "Device or resource busy";
      break;
#endif
#ifdef EEXIST
    case EEXIST:
      error = "File exists";
      break;
#endif
#ifdef EXDEV
    case EXDEV:
      error = "Cross-device link";
      break;
#endif
#ifdef ENODEV
    case ENODEV:
      error = "No such device";
      break;
#endif
#ifdef ENOTDIR
    case ENOTDIR:
      error = "Not a directory";
      break;
#endif
#ifdef EISDIR
    case EISDIR:
      error = "Is a directory";
      break;
#endif
#ifdef EINVAL
    case EINVAL:
      error = "Invalid argument";
      break;
#endif
#ifdef ENFILE
    case ENFILE:
      error = "Too many open files in system";
      break;
#endif
#ifdef EMFILE
    case EMFILE:
      error = "Too many open files";
      break;
#endif
#ifdef ENOTTY
    case ENOTTY:
      error = "Not a character device";
      break;
#endif
#ifdef ETXTBSY
    case ETXTBSY:
      error = "Text file busy";
      break;
#endif
#ifdef EFBIG
    case EFBIG:
      error = "File too large";
      break;
#endif
#ifdef ENOSPC
    case ENOSPC:
      error = "No space left on device";
      break;
#endif
#ifdef ESPIPE
    case ESPIPE:
      error = "Illegal seek";
      break;
#endif
#ifdef EROFS
    case EROFS:
      error = "Read-only file system";
      break;
#endif
#ifdef EMLINK
    case EMLINK:
      error = "Too many links";
      break;
#endif
#ifdef EPIPE
    case EPIPE:
      error = "Broken pipe";
      break;
#endif
#ifdef EDOM
    case EDOM:
      error = "Math argument";
      break;
#endif
#ifdef ERANGE
    case ERANGE:
      error = "Result too large";
      break;
#endif
#ifdef ENOMSG
    case ENOMSG:
      error = "No message of desired type";
      break;
#endif
#ifdef EIDRM
    case EIDRM:
      error = "Identifier removed";
      break;
#endif
#ifdef EDEADLK
    case EDEADLK:
      error = "Deadlock";
      break;
#endif
#ifdef ENOLCK
    case ENOLCK:
      error = "No lock";
      break;
#endif
#ifdef ENOSTR
    case ENOSTR:
      error = "Not a stream";
      break;
#endif
#ifdef ETIME
    case ETIME:
      error = "Stream ioctl timeout";
      break;
#endif
#ifdef ENOSR
    case ENOSR:
      error = "No stream resources";
      break;
#endif
#ifdef ENONET
    case ENONET:
      error = "Machine is not on the network";
      break;
#endif
#ifdef ENOPKG
    case ENOPKG:
      error = "No package";
      break;
#endif
#ifdef EREMOTE
    case EREMOTE:
      error = "Resource is remote";
      break;
#endif
#ifdef ENOLINK
    case ENOLINK:
      error = "Virtual circuit is gone";
      break;
#endif
#ifdef EADV
    case EADV:
      error = "Advertise error";
      break;
#endif
#ifdef ESRMNT
    case ESRMNT:
      error = "Srmount error";
      break;
#endif
#ifdef ECOMM
    case ECOMM:
      error = "Communication error";
      break;
#endif
#ifdef EPROTO
    case EPROTO:
      error = "Protocol error";
      break;
#endif
#ifdef EMULTIHOP
    case EMULTIHOP:
      error = "Multihop attempted";
      break;
#endif
#ifdef EBADMSG
    case EBADMSG:
      error = "Bad message";
      break;
#endif
#ifdef ELIBACC
    case ELIBACC:
      error = "Cannot access a needed shared library";
      break;
#endif
#ifdef ELIBBAD
    case ELIBBAD:
      error = "Accessing a corrupted shared library";
      break;
#endif
#ifdef ELIBSCN
    case ELIBSCN:
      error = ".lib section in a.out corrupted";
      break;
#endif
#ifdef ELIBMAX
    case ELIBMAX:
      error = "Attempting to link in more shared libraries than system limit";
      break;
#endif
#ifdef ELIBEXEC
    case ELIBEXEC:
      error = "Cannot exec a shared library directly";
      break;
#endif
#ifdef ENOSYS
    case ENOSYS:
      error = "Function not implemented";
      break;
#endif
#ifdef ENMFILE
    case ENMFILE:
      error = "No more files";
      break;
#endif
#ifdef ENOTEMPTY
    case ENOTEMPTY:
      error = "Directory not empty";
      break;
#endif
#ifdef ENAMETOOLONG
    case ENAMETOOLONG:
      error = "File or path name too long";
      break;
#endif
#ifdef ELOOP
    case ELOOP:
      error = "Too many symbolic links";
      break;
#endif
#ifdef ENOBUFS
    case ENOBUFS:
      error = "No buffer space available";
      break;
#endif
#ifdef EAFNOSUPPORT
    case EAFNOSUPPORT:
      error = "Address family not supported by protocol family";
      break;
#endif
#ifdef EPROTOTYPE
    case EPROTOTYPE:
      error = "Protocol wrong type for socket";
      break;
#endif
#ifdef ENOTSOCK
    case ENOTSOCK:
      error = "Socket operation on non-socket";
      break;
#endif
#ifdef ENOPROTOOPT
    case ENOPROTOOPT:
      error = "Protocol not available";
      break;
#endif
#ifdef ESHUTDOWN
    case ESHUTDOWN:
      error = "Can't send after socket shutdown";
      break;
#endif
#ifdef ECONNREFUSED
    case ECONNREFUSED:
      error = "Connection refused";
      break;
#endif
#ifdef EADDRINUSE
    case EADDRINUSE:
      error = "Address already in use";
      break;
#endif
#ifdef ECONNABORTED
    case ECONNABORTED:
      error = "Software caused connection abort";
      break;
#endif
    default:
      if ((error = _user_strerror (errnum)) == 0)
	error = "";
      break;
    }
 
  return error;
}