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c0fc376bcf
gcc/libiberty/strerror.c
Zack Weinberg d11ec6f0d9 hashtab.c, [...]: Include string.h if HAVE_STRING_H. 
* hashtab.c, partition.c, sort.c, xmemdup.c: Include string.h
	if HAVE_STRING_H.
	* pexecute.c, xexit.c: Include stdlib.h if HAVE_STDLIB_H.
	* objalloc.c: Include config.h.  Include stdlib.h and don't
	declare malloc or free if HAVE_STDLIB_H.
	* strerror.c, strsignal.c: Include stdlib.h if HAVE_STDLIB_H,
	else declare malloc without prototype.  Include string.h if
	HAVE_STRING_H, else declare memset without prototype.  Don't
	include stddef.h.

From-SVN: r34254
2000-05-29 19:33:52 +00:00

835 lines
21 KiB
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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_errlist sys_errlist__
#endif
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_SYS_ERRLIST
#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
{
int value; /* The numeric value from <errno.h> */
const char *name; /* The equivalent symbolic value */
#ifndef HAVE_SYS_ERRLIST
const char *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
}
/*
NAME
errno_max -- return the max errno value
SYNOPSIS
int errno_max ();
DESCRIPTION
Returns the maximum errno value for which a corresponding symbolic
name or message is available. Note that in the case where
we use the 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 perror(3C) explicitly warns that one
should check the size of the table (sys_nerr) before indexing it,
since new error codes may be added to the system before they are
added to the table. Thus sys_nerr might be smaller than value
implied by the largest errno value defined in <errno.h>.
We return the maximum value that can be used to obtain a meaningful
symbolic name or message.
*/
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
/*
NAME
strerror -- map an error number to an error message string
SYNOPSIS
char *strerror (int errnoval)
DESCRIPTION
Maps an errno number to an error message string, the contents of
which are implementation defined. On systems which have the external
variables sys_nerr and sys_errlist, these strings will be the same
as the ones used by perror().
If the supplied error number is within the valid range of indices
for the sys_errlist, but no message is available for the particular
error number, then returns the string "Error NUM", where NUM is the
error number.
If the supplied error number is not a valid index into sys_errlist,
returns NULL.
The returned string is only guaranteed to be valid only until the
next call to strerror.
*/
char *
strerror (errnoval)
int errnoval;
{
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 */
/*
NAME
strerrno -- map an error number to a symbolic name string
SYNOPSIS
const char *strerrno (int errnoval)
DESCRIPTION
Given an error number returned from a system call (typically
returned in errno), returns a pointer to a string containing the
symbolic name of that error number, as found in <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 "Error NUM", where NUM is
the error number.
If the supplied error number is not within the range of valid
indices, then returns NULL.
BUGS
The contents of the location pointed to are only guaranteed to be
valid until the next call to strerrno.
*/
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))
{
/* In range, but no error_names or no entry at this index. */
sprintf (buf, "Error %d", errnoval);
name = (const char *) buf;
}
else
{
/* In range, and a valid name. Just return the name. */
name = error_names[errnoval];
}
return (name);
}
/*
NAME
strtoerrno -- map a symbolic errno name to a numeric value
SYNOPSIS
int strtoerrno (char *name)
DESCRIPTION
Given the symbolic name of a error number, map it to an errno value.
If no translation is found, returns 0.
*/
int
strtoerrno (name)
const char *name;
{
int errnoval = 0;
if (name != NULL)
{
if (error_names == NULL)
{
init_error_tables ();
}
for (errnoval = 0; errnoval < num_error_names; errnoval++)
{
if ((error_names[errnoval] != NULL) &&
(strcmp (name, error_names[errnoval]) == 0))
{
break;
}
}
if (errnoval == num_error_names)
{
#ifdef EVMSERR
if (strcmp (name, evmserr.name) == 0)
errnoval = evmserr.value;
else
#endif
errnoval = 0;
}
}
return (errnoval);
}
/* A simple little main that does nothing but print all the errno translations
if MAIN is defined and this file is compiled and linked. */
#ifdef MAIN
#include <stdio.h>
int
main ()
{
int errn;
int errnmax;
const char *name;
char *msg;
char *strerror ();
errnmax = errno_max ();
printf ("%d entries in names table.\n", num_error_names);
printf ("%d entries in messages table.\n", sys_nerr);
printf ("%d is max useful index.\n", errnmax);
/* Keep printing values until we get to the end of *both* tables, not
*either* table. Note that knowing the maximum useful index does *not*
relieve us of the responsibility of testing the return pointer for
NULL. */
for (errn = 0; errn <= errnmax; errn++)
{
name = strerrno (errn);
name = (name == NULL) ? "<NULL>" : name;
msg = strerror (errn);
msg = (msg == NULL) ? "<NULL>" : msg;
printf ("%-4d%-18s%s\n", errn, name, msg);
}
return 0;
}
#endif
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