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/* Extended support for using errno values.

   Written by Fred Fish.  fnf@cygnus.com

   This file is in the public domain.  --Per Bothner.  */

#include "ansidecl.h"

#include "libiberty.h"

#include "config.h"

#ifdef HAVE_SYS_ERRLIST

/* Note that errno.h (not sure what OS) or stdio.h (BSD 4.4, at least)

   might declare sys_errlist in a way that the compiler might consider

   incompatible with our later declaration, perhaps by using const

   attributes.  So we hide the declaration in errno.h (if any) using a

   macro. */

#define sys_nerr sys_nerr__

#define sys_errlist sys_errlist__

#endif

#include <stdio.h>

#include <errno.h>

#ifdef HAVE_SYS_ERRLIST

#undef sys_nerr

#undef sys_errlist

#endif

/*  Routines imported from standard C runtime libraries. */

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#else

extern PTR malloc ();

#endif

#ifdef HAVE_STRING_H

#include <string.h>

#else

extern PTR memset ();

#endif

#ifndef MAX

#  define MAX(a,b) ((a) > (b) ? (a) : (b))

#endif

static void init_error_tables PARAMS ((void));

/* Translation table for errno values.  See intro(2) in most UNIX systems

   Programmers Reference Manuals.

   Note that this table is generally only accessed when it is used at runtime

   to initialize errno name and message tables that are indexed by errno

   value.

   Not all of these errnos will exist on all systems.  This table is the only

   thing that should have to be updated as new error numbers are introduced.

   It's sort of ugly, but at least its portable. */

struct error_info

{

  const int value;              /* The numeric value from <errno.h> */

  const char *const name;       /* The equivalent symbolic value */

#ifndef HAVE_SYS_ERRLIST

  const char *const msg;        /* Short message about this value */

#endif

};

#ifndef HAVE_SYS_ERRLIST

#   define ENTRY(value, name, msg)      {value, name, msg}

#else

#   define ENTRY(value, name, msg)      {value, name}

#endif

static const struct error_info error_table[] =

{

#if defined (EPERM)

  ENTRY(EPERM, "EPERM", "Not owner"),

#endif

#if defined (ENOENT)

  ENTRY(ENOENT, "ENOENT", "No such file or directory"),

#endif

#if defined (ESRCH)

  ENTRY(ESRCH, "ESRCH", "No such process"),

#endif

#if defined (EINTR)

  ENTRY(EINTR, "EINTR", "Interrupted system call"),

#endif

#if defined (EIO)

  ENTRY(EIO, "EIO", "I/O error"),

#endif

#if defined (ENXIO)

  ENTRY(ENXIO, "ENXIO", "No such device or address"),

#endif

#if defined (E2BIG)

  ENTRY(E2BIG, "E2BIG", "Arg list too long"),

#endif

#if defined (ENOEXEC)

  ENTRY(ENOEXEC, "ENOEXEC", "Exec format error"),

#endif

#if defined (EBADF)

  ENTRY(EBADF, "EBADF", "Bad file number"),

#endif

#if defined (ECHILD)

  ENTRY(ECHILD, "ECHILD", "No child processes"),

#endif

#if defined (EWOULDBLOCK)       /* Put before EAGAIN, sometimes aliased */

  ENTRY(EWOULDBLOCK, "EWOULDBLOCK", "Operation would block"),

#endif

#if defined (EAGAIN)

  ENTRY(EAGAIN, "EAGAIN", "No more processes"),

#endif

#if defined (ENOMEM)

  ENTRY(ENOMEM, "ENOMEM", "Not enough space"),

#endif

#if defined (EACCES)

  ENTRY(EACCES, "EACCES", "Permission denied"),

#endif

#if defined (EFAULT)

  ENTRY(EFAULT, "EFAULT", "Bad address"),

#endif

#if defined (ENOTBLK)

  ENTRY(ENOTBLK, "ENOTBLK", "Block device required"),

#endif

#if defined (EBUSY)

  ENTRY(EBUSY, "EBUSY", "Device busy"),

#endif

#if defined (EEXIST)

  ENTRY(EEXIST, "EEXIST", "File exists"),

#endif

#if defined (EXDEV)

  ENTRY(EXDEV, "EXDEV", "Cross-device link"),

#endif

#if defined (ENODEV)

  ENTRY(ENODEV, "ENODEV", "No such device"),

#endif

#if defined (ENOTDIR)

  ENTRY(ENOTDIR, "ENOTDIR", "Not a directory"),

#endif

#if defined (EISDIR)

  ENTRY(EISDIR, "EISDIR", "Is a directory"),

#endif

#if defined (EINVAL)

  ENTRY(EINVAL, "EINVAL", "Invalid argument"),

#endif

#if defined (ENFILE)

  ENTRY(ENFILE, "ENFILE", "File table overflow"),

#endif

#if defined (EMFILE)

  ENTRY(EMFILE, "EMFILE", "Too many open files"),

#endif

#if defined (ENOTTY)

  ENTRY(ENOTTY, "ENOTTY", "Not a typewriter"),

#endif

#if defined (ETXTBSY)

  ENTRY(ETXTBSY, "ETXTBSY", "Text file busy"),

#endif

#if defined (EFBIG)

  ENTRY(EFBIG, "EFBIG", "File too large"),

#endif

#if defined (ENOSPC)

  ENTRY(ENOSPC, "ENOSPC", "No space left on device"),

#endif

#if defined (ESPIPE)

  ENTRY(ESPIPE, "ESPIPE", "Illegal seek"),

#endif

#if defined (EROFS)

  ENTRY(EROFS, "EROFS", "Read-only file system"),

#endif

#if defined (EMLINK)

  ENTRY(EMLINK, "EMLINK", "Too many links"),

#endif

#if defined (EPIPE)

  ENTRY(EPIPE, "EPIPE", "Broken pipe"),

#endif

#if defined (EDOM)

  ENTRY(EDOM, "EDOM", "Math argument out of domain of func"),

#endif

#if defined (ERANGE)

  ENTRY(ERANGE, "ERANGE", "Math result not representable"),

#endif

#if defined (ENOMSG)

  ENTRY(ENOMSG, "ENOMSG", "No message of desired type"),

#endif

#if defined (EIDRM)

  ENTRY(EIDRM, "EIDRM", "Identifier removed"),

#endif

#if defined (ECHRNG)

  ENTRY(ECHRNG, "ECHRNG", "Channel number out of range"),

#endif

#if defined (EL2NSYNC)

  ENTRY(EL2NSYNC, "EL2NSYNC", "Level 2 not synchronized"),

#endif

#if defined (EL3HLT)

  ENTRY(EL3HLT, "EL3HLT", "Level 3 halted"),

#endif

#if defined (EL3RST)

  ENTRY(EL3RST, "EL3RST", "Level 3 reset"),

#endif

#if defined (ELNRNG)

  ENTRY(ELNRNG, "ELNRNG", "Link number out of range"),

#endif

#if defined (EUNATCH)

  ENTRY(EUNATCH, "EUNATCH", "Protocol driver not attached"),

#endif

#if defined (ENOCSI)

  ENTRY(ENOCSI, "ENOCSI", "No CSI structure available"),

#endif

#if defined (EL2HLT)

  ENTRY(EL2HLT, "EL2HLT", "Level 2 halted"),

#endif

#if defined (EDEADLK)

  ENTRY(EDEADLK, "EDEADLK", "Deadlock condition"),

#endif

#if defined (ENOLCK)

  ENTRY(ENOLCK, "ENOLCK", "No record locks available"),

#endif

#if defined (EBADE)

  ENTRY(EBADE, "EBADE", "Invalid exchange"),

#endif

#if defined (EBADR)

  ENTRY(EBADR, "EBADR", "Invalid request descriptor"),

#endif

#if defined (EXFULL)

  ENTRY(EXFULL, "EXFULL", "Exchange full"),

#endif

#if defined (ENOANO)

  ENTRY(ENOANO, "ENOANO", "No anode"),

#endif

#if defined (EBADRQC)

  ENTRY(EBADRQC, "EBADRQC", "Invalid request code"),

#endif

#if defined (EBADSLT)

  ENTRY(EBADSLT, "EBADSLT", "Invalid slot"),

#endif

#if defined (EDEADLOCK)

  ENTRY(EDEADLOCK, "EDEADLOCK", "File locking deadlock error"),

#endif

#if defined (EBFONT)

  ENTRY(EBFONT, "EBFONT", "Bad font file format"),

#endif

#if defined (ENOSTR)

  ENTRY(ENOSTR, "ENOSTR", "Device not a stream"),

#endif

#if defined (ENODATA)

  ENTRY(ENODATA, "ENODATA", "No data available"),

#endif

#if defined (ETIME)

  ENTRY(ETIME, "ETIME", "Timer expired"),

#endif

#if defined (ENOSR)

  ENTRY(ENOSR, "ENOSR", "Out of streams resources"),

#endif

#if defined (ENONET)

  ENTRY(ENONET, "ENONET", "Machine is not on the network"),

#endif

#if defined (ENOPKG)

  ENTRY(ENOPKG, "ENOPKG", "Package not installed"),

#endif

#if defined (EREMOTE)

  ENTRY(EREMOTE, "EREMOTE", "Object is remote"),

#endif

#if defined (ENOLINK)

  ENTRY(ENOLINK, "ENOLINK", "Link has been severed"),

#endif

#if defined (EADV)

  ENTRY(EADV, "EADV", "Advertise error"),

#endif

#if defined (ESRMNT)

  ENTRY(ESRMNT, "ESRMNT", "Srmount error"),

#endif

#if defined (ECOMM)

  ENTRY(ECOMM, "ECOMM", "Communication error on send"),

#endif

#if defined (EPROTO)

  ENTRY(EPROTO, "EPROTO", "Protocol error"),

#endif

#if defined (EMULTIHOP)

  ENTRY(EMULTIHOP, "EMULTIHOP", "Multihop attempted"),

#endif

#if defined (EDOTDOT)

  ENTRY(EDOTDOT, "EDOTDOT", "RFS specific error"),

#endif

#if defined (EBADMSG)

  ENTRY(EBADMSG, "EBADMSG", "Not a data message"),

#endif

#if defined (ENAMETOOLONG)

  ENTRY(ENAMETOOLONG, "ENAMETOOLONG", "File name too long"),

#endif

#if defined (EOVERFLOW)

  ENTRY(EOVERFLOW, "EOVERFLOW", "Value too large for defined data type"),

#endif

#if defined (ENOTUNIQ)

  ENTRY(ENOTUNIQ, "ENOTUNIQ", "Name not unique on network"),

#endif

#if defined (EBADFD)

  ENTRY(EBADFD, "EBADFD", "File descriptor in bad state"),

#endif

#if defined (EREMCHG)

  ENTRY(EREMCHG, "EREMCHG", "Remote address changed"),

#endif

#if defined (ELIBACC)

  ENTRY(ELIBACC, "ELIBACC", "Can not access a needed shared library"),

#endif

#if defined (ELIBBAD)

  ENTRY(ELIBBAD, "ELIBBAD", "Accessing a corrupted shared library"),

#endif

#if defined (ELIBSCN)

  ENTRY(ELIBSCN, "ELIBSCN", ".lib section in a.out corrupted"),

#endif

#if defined (ELIBMAX)

  ENTRY(ELIBMAX, "ELIBMAX", "Attempting to link in too many shared libraries"),

#endif

#if defined (ELIBEXEC)

  ENTRY(ELIBEXEC, "ELIBEXEC", "Cannot exec a shared library directly"),

#endif

#if defined (EILSEQ)

  ENTRY(EILSEQ, "EILSEQ", "Illegal byte sequence"),

#endif

#if defined (ENOSYS)

  ENTRY(ENOSYS, "ENOSYS", "Operation not applicable"),

#endif

#if defined (ELOOP)

  ENTRY(ELOOP, "ELOOP", "Too many symbolic links encountered"),

#endif

#if defined (ERESTART)

  ENTRY(ERESTART, "ERESTART", "Interrupted system call should be restarted"),

#endif

#if defined (ESTRPIPE)

  ENTRY(ESTRPIPE, "ESTRPIPE", "Streams pipe error"),

#endif

#if defined (ENOTEMPTY)

  ENTRY(ENOTEMPTY, "ENOTEMPTY", "Directory not empty"),

#endif

#if defined (EUSERS)

  ENTRY(EUSERS, "EUSERS", "Too many users"),

#endif

#if defined (ENOTSOCK)

  ENTRY(ENOTSOCK, "ENOTSOCK", "Socket operation on non-socket"),

#endif

#if defined (EDESTADDRREQ)

  ENTRY(EDESTADDRREQ, "EDESTADDRREQ", "Destination address required"),

#endif

#if defined (EMSGSIZE)

  ENTRY(EMSGSIZE, "EMSGSIZE", "Message too long"),

#endif

#if defined (EPROTOTYPE)

  ENTRY(EPROTOTYPE, "EPROTOTYPE", "Protocol wrong type for socket"),

#endif

#if defined (ENOPROTOOPT)

  ENTRY(ENOPROTOOPT, "ENOPROTOOPT", "Protocol not available"),

#endif

#if defined (EPROTONOSUPPORT)

  ENTRY(EPROTONOSUPPORT, "EPROTONOSUPPORT", "Protocol not supported"),

#endif

#if defined (ESOCKTNOSUPPORT)

  ENTRY(ESOCKTNOSUPPORT, "ESOCKTNOSUPPORT", "Socket type not supported"),

#endif

#if defined (EOPNOTSUPP)

  ENTRY(EOPNOTSUPP, "EOPNOTSUPP", "Operation not supported on transport endpoint"),

#endif

#if defined (EPFNOSUPPORT)

  ENTRY(EPFNOSUPPORT, "EPFNOSUPPORT", "Protocol family not supported"),

#endif

#if defined (EAFNOSUPPORT)

  ENTRY(EAFNOSUPPORT, "EAFNOSUPPORT", "Address family not supported by protocol"),

#endif

#if defined (EADDRINUSE)

  ENTRY(EADDRINUSE, "EADDRINUSE", "Address already in use"),

#endif

#if defined (EADDRNOTAVAIL)

  ENTRY(EADDRNOTAVAIL, "EADDRNOTAVAIL","Cannot assign requested address"),

#endif

#if defined (ENETDOWN)

  ENTRY(ENETDOWN, "ENETDOWN", "Network is down"),

#endif

#if defined (ENETUNREACH)

  ENTRY(ENETUNREACH, "ENETUNREACH", "Network is unreachable"),

#endif

#if defined (ENETRESET)

  ENTRY(ENETRESET, "ENETRESET", "Network dropped connection because of reset"),

#endif

#if defined (ECONNABORTED)

  ENTRY(ECONNABORTED, "ECONNABORTED", "Software caused connection abort"),

#endif

#if defined (ECONNRESET)

  ENTRY(ECONNRESET, "ECONNRESET", "Connection reset by peer"),

#endif

#if defined (ENOBUFS)

  ENTRY(ENOBUFS, "ENOBUFS", "No buffer space available"),

#endif

#if defined (EISCONN)

  ENTRY(EISCONN, "EISCONN", "Transport endpoint is already connected"),

#endif

#if defined (ENOTCONN)

  ENTRY(ENOTCONN, "ENOTCONN", "Transport endpoint is not connected"),

#endif

#if defined (ESHUTDOWN)

  ENTRY(ESHUTDOWN, "ESHUTDOWN", "Cannot send after transport endpoint shutdown"),

#endif

#if defined (ETOOMANYREFS)

  ENTRY(ETOOMANYREFS, "ETOOMANYREFS", "Too many references: cannot splice"),

#endif

#if defined (ETIMEDOUT)

  ENTRY(ETIMEDOUT, "ETIMEDOUT", "Connection timed out"),

#endif

#if defined (ECONNREFUSED)

  ENTRY(ECONNREFUSED, "ECONNREFUSED", "Connection refused"),

#endif

#if defined (EHOSTDOWN)

  ENTRY(EHOSTDOWN, "EHOSTDOWN", "Host is down"),

#endif

#if defined (EHOSTUNREACH)

  ENTRY(EHOSTUNREACH, "EHOSTUNREACH", "No route to host"),

#endif

#if defined (EALREADY)

  ENTRY(EALREADY, "EALREADY", "Operation already in progress"),

#endif

#if defined (EINPROGRESS)

  ENTRY(EINPROGRESS, "EINPROGRESS", "Operation now in progress"),

#endif

#if defined (ESTALE)

  ENTRY(ESTALE, "ESTALE", "Stale NFS file handle"),

#endif

#if defined (EUCLEAN)

  ENTRY(EUCLEAN, "EUCLEAN", "Structure needs cleaning"),

#endif

#if defined (ENOTNAM)

  ENTRY(ENOTNAM, "ENOTNAM", "Not a XENIX named type file"),

#endif

#if defined (ENAVAIL)

  ENTRY(ENAVAIL, "ENAVAIL", "No XENIX semaphores available"),

#endif

#if defined (EISNAM)

  ENTRY(EISNAM, "EISNAM", "Is a named type file"),

#endif

#if defined (EREMOTEIO)

  ENTRY(EREMOTEIO, "EREMOTEIO", "Remote I/O error"),

#endif

  ENTRY(0, NULL, NULL)

};

#ifdef EVMSERR

/* This is not in the table, because the numeric value of EVMSERR (32767)

   lies outside the range of sys_errlist[].  */

static struct { int value; const char *name, *msg; }

  evmserr = { EVMSERR, "EVMSERR", "VMS-specific error" };

#endif

/* Translation table allocated and initialized at runtime.  Indexed by the

   errno value to find the equivalent symbolic value. */

static const char **error_names;

static int num_error_names = 0;

/* Translation table allocated and initialized at runtime, if it does not

   already exist in the host environment.  Indexed by the errno value to find

   the descriptive string.

   We don't export it for use in other modules because even though it has the

   same name, it differs from other implementations in that it is dynamically

   initialized rather than statically initialized. */

#ifndef HAVE_SYS_ERRLIST

static int sys_nerr;

static const char **sys_errlist;

#else

extern int sys_nerr;

extern char *sys_errlist[];

#endif

/*

NAME

        init_error_tables -- initialize the name and message tables

SYNOPSIS

        static void init_error_tables ();

DESCRIPTION

        Using the error_table, which is initialized at compile time, generate

        the error_names and the sys_errlist (if needed) tables, which are

        indexed at runtime by a specific errno value.

BUGS

        The initialization of the tables may fail under low memory conditions,

        in which case we don't do anything particularly useful, but we don't

        bomb either.  Who knows, it might succeed at a later point if we free

        some memory in the meantime.  In any case, the other routines know

        how to deal with lack of a table after trying to initialize it.  This

        may or may not be considered to be a bug, that we don't specifically

        warn about this particular failure mode.

*/

static void

init_error_tables ()

{

  const struct error_info *eip;

  int nbytes;

  /* If we haven't already scanned the error_table once to find the maximum

     errno value, then go find it now. */

  if (num_error_names == 0)

    {

      for (eip = error_table; eip -> name != NULL; eip++)

        {

          if (eip -> value >= num_error_names)

            {

              num_error_names = eip -> value + 1;

            }

        }

    }

  /* Now attempt to allocate the error_names table, zero it out, and then

     initialize it from the statically initialized error_table. */

  if (error_names == NULL)

    {

      nbytes = num_error_names * sizeof (char *);

      if ((error_names = (const char **) malloc (nbytes)) != NULL)

        {

          memset (error_names, 0, nbytes);

          for (eip = error_table; eip -> name != NULL; eip++)

            {

              error_names[eip -> value] = eip -> name;

            }

        }

    }

#ifndef HAVE_SYS_ERRLIST

  /* Now attempt to allocate the sys_errlist table, zero it out, and then

     initialize it from the statically initialized error_table. */

  if (sys_errlist == NULL)

    {

      nbytes = num_error_names * sizeof (char *);

      if ((sys_errlist = (const char **) malloc (nbytes)) != NULL)

        {

          memset (sys_errlist, 0, nbytes);

          sys_nerr = num_error_names;

          for (eip = error_table; eip -> name != NULL; eip++)

            {

              sys_errlist[eip -> value] = eip -> msg;

            }

        }

    }

#endif

}

/*

@deftypefn Extension int errno_max (void)

Returns the maximum @code{errno} value for which a corresponding

symbolic name or message is available.  Note that in the case where we

use the @code{sys_errlist} supplied by the system, it is possible for

there to be more symbolic names than messages, or vice versa.  In

fact, the manual page for @code{perror(3C)} explicitly warns that one

should check the size of the table (@code{sys_nerr}) before indexing

it, since new error codes may be added to the system before they are

added to the table.  Thus @code{sys_nerr} might be smaller than value

implied by the largest @code{errno} value defined in @code{<errno.h>}.

We return the maximum value that can be used to obtain a meaningful

symbolic name or message.

@end deftypefn

*/

int

errno_max ()

{

  int maxsize;

  if (error_names == NULL)

    {

      init_error_tables ();

    }

  maxsize = MAX (sys_nerr, num_error_names);

  return (maxsize - 1);

}

#ifndef HAVE_STRERROR

/*

@deftypefn Supplemental char* strerror (int @var{errnoval})

Maps an @code{errno} number to an error message string, the contents

of which are implementation defined.  On systems which have the

external variables @code{sys_nerr} and @code{sys_errlist}, these

strings will be the same as the ones used by @code{perror}.

If the supplied error number is within the valid range of indices for

the @code{sys_errlist}, but no message is available for the particular

error number, then returns the string @samp{Error @var{num}}, where

@var{num} is the error number.

If the supplied error number is not a valid index into

@code{sys_errlist}, returns @code{NULL}.

The returned string is only guaranteed to be valid only until the

next call to @code{strerror}.

@end deftypefn

*/

char *

strerror (errnoval)

  int errnoval;

{

  const char *msg;

  static char buf[32];

#ifndef HAVE_SYS_ERRLIST

  if (error_names == NULL)

    {

      init_error_tables ();

    }

#endif

  if ((errnoval < 0) || (errnoval >= sys_nerr))

    {

#ifdef EVMSERR

      if (errnoval == evmserr.value)

        msg = evmserr.msg;

      else

#endif

      /* Out of range, just return NULL */

      msg = NULL;

    }

  else if ((sys_errlist == NULL) || (sys_errlist[errnoval] == NULL))

    {

      /* In range, but no sys_errlist or no entry at this index. */

      sprintf (buf, "Error %d", errnoval);

      msg = buf;

    }

  else

    {

      /* In range, and a valid message.  Just return the message. */

      msg = (char *) sys_errlist[errnoval];

    }

  return (msg);

}

#endif  /* ! HAVE_STRERROR */

/*

@deftypefn Replacement {const char*} strerrno (int @var{errnum})

Given an error number returned from a system call (typically returned

in @code{errno}), returns a pointer to a string containing the

symbolic name of that error number, as found in @code{<errno.h>}.

If the supplied error number is within the valid range of indices for

symbolic names, but no name is available for the particular error

number, then returns the string @samp{Error @var{num}}, where @var{num}

is the error number.

If the supplied error number is not within the range of valid

indices, then returns @code{NULL}.

The contents of the location pointed to are only guaranteed to be

valid until the next call to @code{strerrno}.

@end deftypefn

*/

const char *

strerrno (errnoval)

  int errnoval;

{

  const char *name;

  static char buf[32];

  if (error_names == NULL)

    {

      init_error_tables ();

    }

  if ((errnoval < 0) || (errnoval >= num_error_names))

    {

#ifdef EVMSERR

      if (errnoval == evmserr.value)

        name = evmserr.name;

      else

#endif

      /* Out of range, just return NULL */

      name = NULL;

    }

  else if ((error_names == NULL) || (error_names[errnoval] == NULL))