summaryrefslogtreecommitdiff
path: root/libiberty/strerror.c
diff options
context:
space:
mode:
Diffstat (limited to 'libiberty/strerror.c')
-rw-r--r--libiberty/strerror.c831
1 files changed, 831 insertions, 0 deletions
diff --git a/libiberty/strerror.c b/libiberty/strerror.c
new file mode 100644
index 00000000000..644cc75462a
--- /dev/null
+++ b/libiberty/strerror.c
@@ -0,0 +1,831 @@
+/* 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 __STDC__
+#include <stddef.h>
+extern void *malloc (size_t size); /* 4.10.3.3 */
+extern void *memset (void *s, int c, size_t n); /* 4.11.6.1 */
+#else /* !__STDC__ */
+extern char *malloc (); /* Standard memory allocater */
+extern char *memset ();
+#endif /* __STDC__ */
+
+#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