813 lines
21 KiB
C
813 lines
21 KiB
C
/* Extended support for using errno values.
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Written by Fred Fish. fnf@cygnus.com
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This file is in the public domain. --Per Bothner. */
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#include "ansidecl.h"
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#include "libiberty.h"
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#include "config.h"
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#ifdef HAVE_SYS_ERRLIST
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/* Note that errno.h (not sure what OS) or stdio.h (BSD 4.4, at least)
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might declare sys_errlist in a way that the compiler might consider
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incompatible with our later declaration, perhaps by using const
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attributes. So we hide the declaration in errno.h (if any) using a
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macro. */
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#define sys_nerr sys_nerr__
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#define sys_errlist sys_errlist__
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#endif
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_SYS_ERRLIST
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#undef sys_nerr
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#undef sys_errlist
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#endif
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/* Routines imported from standard C runtime libraries. */
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#else
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extern PTR malloc ();
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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extern PTR memset ();
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#endif
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#ifndef MAX
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# define MAX(a,b) ((a) > (b) ? (a) : (b))
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#endif
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static void init_error_tables PARAMS ((void));
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/* Translation table for errno values. See intro(2) in most UNIX systems
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Programmers Reference Manuals.
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Note that this table is generally only accessed when it is used at runtime
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to initialize errno name and message tables that are indexed by errno
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value.
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Not all of these errnos will exist on all systems. This table is the only
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thing that should have to be updated as new error numbers are introduced.
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It's sort of ugly, but at least its portable. */
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struct error_info
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{
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const int value; /* The numeric value from <errno.h> */
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const char *const name; /* The equivalent symbolic value */
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#ifndef HAVE_SYS_ERRLIST
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const char *const msg; /* Short message about this value */
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#endif
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};
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#ifndef HAVE_SYS_ERRLIST
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# define ENTRY(value, name, msg) {value, name, msg}
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#else
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# define ENTRY(value, name, msg) {value, name}
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#endif
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static const struct error_info error_table[] =
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{
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#if defined (EPERM)
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ENTRY(EPERM, "EPERM", "Not owner"),
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#endif
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#if defined (ENOENT)
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ENTRY(ENOENT, "ENOENT", "No such file or directory"),
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#endif
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#if defined (ESRCH)
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ENTRY(ESRCH, "ESRCH", "No such process"),
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#endif
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#if defined (EINTR)
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ENTRY(EINTR, "EINTR", "Interrupted system call"),
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#endif
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#if defined (EIO)
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ENTRY(EIO, "EIO", "I/O error"),
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#endif
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#if defined (ENXIO)
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ENTRY(ENXIO, "ENXIO", "No such device or address"),
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#endif
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#if defined (E2BIG)
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ENTRY(E2BIG, "E2BIG", "Arg list too long"),
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#endif
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#if defined (ENOEXEC)
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ENTRY(ENOEXEC, "ENOEXEC", "Exec format error"),
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#endif
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#if defined (EBADF)
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ENTRY(EBADF, "EBADF", "Bad file number"),
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#endif
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#if defined (ECHILD)
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ENTRY(ECHILD, "ECHILD", "No child processes"),
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#endif
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#if defined (EWOULDBLOCK) /* Put before EAGAIN, sometimes aliased */
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ENTRY(EWOULDBLOCK, "EWOULDBLOCK", "Operation would block"),
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#endif
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#if defined (EAGAIN)
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ENTRY(EAGAIN, "EAGAIN", "No more processes"),
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#endif
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#if defined (ENOMEM)
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ENTRY(ENOMEM, "ENOMEM", "Not enough space"),
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#endif
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#if defined (EACCES)
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ENTRY(EACCES, "EACCES", "Permission denied"),
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#endif
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#if defined (EFAULT)
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ENTRY(EFAULT, "EFAULT", "Bad address"),
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#endif
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#if defined (ENOTBLK)
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ENTRY(ENOTBLK, "ENOTBLK", "Block device required"),
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#endif
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#if defined (EBUSY)
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ENTRY(EBUSY, "EBUSY", "Device busy"),
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#endif
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#if defined (EEXIST)
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ENTRY(EEXIST, "EEXIST", "File exists"),
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#endif
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#if defined (EXDEV)
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ENTRY(EXDEV, "EXDEV", "Cross-device link"),
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#endif
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#if defined (ENODEV)
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ENTRY(ENODEV, "ENODEV", "No such device"),
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#endif
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#if defined (ENOTDIR)
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ENTRY(ENOTDIR, "ENOTDIR", "Not a directory"),
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#endif
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#if defined (EISDIR)
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ENTRY(EISDIR, "EISDIR", "Is a directory"),
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#endif
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#if defined (EINVAL)
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ENTRY(EINVAL, "EINVAL", "Invalid argument"),
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#endif
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#if defined (ENFILE)
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ENTRY(ENFILE, "ENFILE", "File table overflow"),
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#endif
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#if defined (EMFILE)
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ENTRY(EMFILE, "EMFILE", "Too many open files"),
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#endif
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#if defined (ENOTTY)
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ENTRY(ENOTTY, "ENOTTY", "Not a typewriter"),
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#endif
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#if defined (ETXTBSY)
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ENTRY(ETXTBSY, "ETXTBSY", "Text file busy"),
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#endif
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#if defined (EFBIG)
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ENTRY(EFBIG, "EFBIG", "File too large"),
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#endif
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#if defined (ENOSPC)
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ENTRY(ENOSPC, "ENOSPC", "No space left on device"),
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#endif
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#if defined (ESPIPE)
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ENTRY(ESPIPE, "ESPIPE", "Illegal seek"),
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#endif
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#if defined (EROFS)
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ENTRY(EROFS, "EROFS", "Read-only file system"),
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#endif
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#if defined (EMLINK)
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ENTRY(EMLINK, "EMLINK", "Too many links"),
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#endif
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#if defined (EPIPE)
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ENTRY(EPIPE, "EPIPE", "Broken pipe"),
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#endif
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#if defined (EDOM)
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ENTRY(EDOM, "EDOM", "Math argument out of domain of func"),
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#endif
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#if defined (ERANGE)
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ENTRY(ERANGE, "ERANGE", "Math result not representable"),
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#endif
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#if defined (ENOMSG)
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ENTRY(ENOMSG, "ENOMSG", "No message of desired type"),
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#endif
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#if defined (EIDRM)
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ENTRY(EIDRM, "EIDRM", "Identifier removed"),
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#endif
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#if defined (ECHRNG)
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ENTRY(ECHRNG, "ECHRNG", "Channel number out of range"),
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#endif
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#if defined (EL2NSYNC)
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ENTRY(EL2NSYNC, "EL2NSYNC", "Level 2 not synchronized"),
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#endif
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#if defined (EL3HLT)
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ENTRY(EL3HLT, "EL3HLT", "Level 3 halted"),
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#endif
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#if defined (EL3RST)
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ENTRY(EL3RST, "EL3RST", "Level 3 reset"),
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#endif
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#if defined (ELNRNG)
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ENTRY(ELNRNG, "ELNRNG", "Link number out of range"),
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#endif
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#if defined (EUNATCH)
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ENTRY(EUNATCH, "EUNATCH", "Protocol driver not attached"),
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#endif
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#if defined (ENOCSI)
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ENTRY(ENOCSI, "ENOCSI", "No CSI structure available"),
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#endif
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#if defined (EL2HLT)
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ENTRY(EL2HLT, "EL2HLT", "Level 2 halted"),
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#endif
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#if defined (EDEADLK)
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ENTRY(EDEADLK, "EDEADLK", "Deadlock condition"),
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#endif
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#if defined (ENOLCK)
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ENTRY(ENOLCK, "ENOLCK", "No record locks available"),
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#endif
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#if defined (EBADE)
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ENTRY(EBADE, "EBADE", "Invalid exchange"),
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#endif
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#if defined (EBADR)
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ENTRY(EBADR, "EBADR", "Invalid request descriptor"),
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#endif
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#if defined (EXFULL)
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ENTRY(EXFULL, "EXFULL", "Exchange full"),
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#endif
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#if defined (ENOANO)
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ENTRY(ENOANO, "ENOANO", "No anode"),
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#endif
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#if defined (EBADRQC)
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ENTRY(EBADRQC, "EBADRQC", "Invalid request code"),
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#endif
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#if defined (EBADSLT)
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ENTRY(EBADSLT, "EBADSLT", "Invalid slot"),
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#endif
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#if defined (EDEADLOCK)
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ENTRY(EDEADLOCK, "EDEADLOCK", "File locking deadlock error"),
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#endif
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#if defined (EBFONT)
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ENTRY(EBFONT, "EBFONT", "Bad font file format"),
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#endif
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#if defined (ENOSTR)
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ENTRY(ENOSTR, "ENOSTR", "Device not a stream"),
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#endif
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#if defined (ENODATA)
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ENTRY(ENODATA, "ENODATA", "No data available"),
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#endif
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#if defined (ETIME)
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ENTRY(ETIME, "ETIME", "Timer expired"),
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#endif
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#if defined (ENOSR)
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ENTRY(ENOSR, "ENOSR", "Out of streams resources"),
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#endif
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#if defined (ENONET)
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ENTRY(ENONET, "ENONET", "Machine is not on the network"),
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#endif
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#if defined (ENOPKG)
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ENTRY(ENOPKG, "ENOPKG", "Package not installed"),
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#endif
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#if defined (EREMOTE)
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ENTRY(EREMOTE, "EREMOTE", "Object is remote"),
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#endif
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#if defined (ENOLINK)
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ENTRY(ENOLINK, "ENOLINK", "Link has been severed"),
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#endif
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#if defined (EADV)
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ENTRY(EADV, "EADV", "Advertise error"),
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#endif
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#if defined (ESRMNT)
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ENTRY(ESRMNT, "ESRMNT", "Srmount error"),
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#endif
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#if defined (ECOMM)
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ENTRY(ECOMM, "ECOMM", "Communication error on send"),
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#endif
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#if defined (EPROTO)
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ENTRY(EPROTO, "EPROTO", "Protocol error"),
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#endif
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#if defined (EMULTIHOP)
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ENTRY(EMULTIHOP, "EMULTIHOP", "Multihop attempted"),
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#endif
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#if defined (EDOTDOT)
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ENTRY(EDOTDOT, "EDOTDOT", "RFS specific error"),
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#endif
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#if defined (EBADMSG)
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ENTRY(EBADMSG, "EBADMSG", "Not a data message"),
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#endif
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#if defined (ENAMETOOLONG)
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ENTRY(ENAMETOOLONG, "ENAMETOOLONG", "File name too long"),
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#endif
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#if defined (EOVERFLOW)
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ENTRY(EOVERFLOW, "EOVERFLOW", "Value too large for defined data type"),
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#endif
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#if defined (ENOTUNIQ)
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ENTRY(ENOTUNIQ, "ENOTUNIQ", "Name not unique on network"),
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#endif
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#if defined (EBADFD)
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ENTRY(EBADFD, "EBADFD", "File descriptor in bad state"),
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#endif
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#if defined (EREMCHG)
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ENTRY(EREMCHG, "EREMCHG", "Remote address changed"),
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#endif
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#if defined (ELIBACC)
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ENTRY(ELIBACC, "ELIBACC", "Can not access a needed shared library"),
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#endif
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#if defined (ELIBBAD)
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ENTRY(ELIBBAD, "ELIBBAD", "Accessing a corrupted shared library"),
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#endif
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#if defined (ELIBSCN)
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ENTRY(ELIBSCN, "ELIBSCN", ".lib section in a.out corrupted"),
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#endif
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#if defined (ELIBMAX)
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ENTRY(ELIBMAX, "ELIBMAX", "Attempting to link in too many shared libraries"),
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#endif
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#if defined (ELIBEXEC)
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ENTRY(ELIBEXEC, "ELIBEXEC", "Cannot exec a shared library directly"),
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#endif
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#if defined (EILSEQ)
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ENTRY(EILSEQ, "EILSEQ", "Illegal byte sequence"),
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#endif
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#if defined (ENOSYS)
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ENTRY(ENOSYS, "ENOSYS", "Operation not applicable"),
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#endif
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#if defined (ELOOP)
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ENTRY(ELOOP, "ELOOP", "Too many symbolic links encountered"),
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#endif
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#if defined (ERESTART)
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ENTRY(ERESTART, "ERESTART", "Interrupted system call should be restarted"),
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#endif
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#if defined (ESTRPIPE)
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ENTRY(ESTRPIPE, "ESTRPIPE", "Streams pipe error"),
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#endif
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#if defined (ENOTEMPTY)
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ENTRY(ENOTEMPTY, "ENOTEMPTY", "Directory not empty"),
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#endif
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#if defined (EUSERS)
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ENTRY(EUSERS, "EUSERS", "Too many users"),
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#endif
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#if defined (ENOTSOCK)
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ENTRY(ENOTSOCK, "ENOTSOCK", "Socket operation on non-socket"),
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#endif
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#if defined (EDESTADDRREQ)
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ENTRY(EDESTADDRREQ, "EDESTADDRREQ", "Destination address required"),
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#endif
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#if defined (EMSGSIZE)
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ENTRY(EMSGSIZE, "EMSGSIZE", "Message too long"),
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#endif
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#if defined (EPROTOTYPE)
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ENTRY(EPROTOTYPE, "EPROTOTYPE", "Protocol wrong type for socket"),
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#endif
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#if defined (ENOPROTOOPT)
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ENTRY(ENOPROTOOPT, "ENOPROTOOPT", "Protocol not available"),
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#endif
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#if defined (EPROTONOSUPPORT)
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ENTRY(EPROTONOSUPPORT, "EPROTONOSUPPORT", "Protocol not supported"),
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#endif
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#if defined (ESOCKTNOSUPPORT)
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ENTRY(ESOCKTNOSUPPORT, "ESOCKTNOSUPPORT", "Socket type not supported"),
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#endif
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#if defined (EOPNOTSUPP)
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ENTRY(EOPNOTSUPP, "EOPNOTSUPP", "Operation not supported on transport endpoint"),
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#endif
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#if defined (EPFNOSUPPORT)
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ENTRY(EPFNOSUPPORT, "EPFNOSUPPORT", "Protocol family not supported"),
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#endif
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#if defined (EAFNOSUPPORT)
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ENTRY(EAFNOSUPPORT, "EAFNOSUPPORT", "Address family not supported by protocol"),
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#endif
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#if defined (EADDRINUSE)
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ENTRY(EADDRINUSE, "EADDRINUSE", "Address already in use"),
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#endif
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#if defined (EADDRNOTAVAIL)
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ENTRY(EADDRNOTAVAIL, "EADDRNOTAVAIL","Cannot assign requested address"),
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#endif
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#if defined (ENETDOWN)
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ENTRY(ENETDOWN, "ENETDOWN", "Network is down"),
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#endif
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#if defined (ENETUNREACH)
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ENTRY(ENETUNREACH, "ENETUNREACH", "Network is unreachable"),
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#endif
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#if defined (ENETRESET)
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ENTRY(ENETRESET, "ENETRESET", "Network dropped connection because of reset"),
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#endif
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#if defined (ECONNABORTED)
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ENTRY(ECONNABORTED, "ECONNABORTED", "Software caused connection abort"),
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#endif
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#if defined (ECONNRESET)
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ENTRY(ECONNRESET, "ECONNRESET", "Connection reset by peer"),
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#endif
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#if defined (ENOBUFS)
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ENTRY(ENOBUFS, "ENOBUFS", "No buffer space available"),
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#endif
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#if defined (EISCONN)
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ENTRY(EISCONN, "EISCONN", "Transport endpoint is already connected"),
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#endif
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#if defined (ENOTCONN)
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ENTRY(ENOTCONN, "ENOTCONN", "Transport endpoint is not connected"),
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#endif
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#if defined (ESHUTDOWN)
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ENTRY(ESHUTDOWN, "ESHUTDOWN", "Cannot send after transport endpoint shutdown"),
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#endif
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#if defined (ETOOMANYREFS)
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ENTRY(ETOOMANYREFS, "ETOOMANYREFS", "Too many references: cannot splice"),
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#endif
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#if defined (ETIMEDOUT)
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ENTRY(ETIMEDOUT, "ETIMEDOUT", "Connection timed out"),
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#endif
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#if defined (ECONNREFUSED)
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ENTRY(ECONNREFUSED, "ECONNREFUSED", "Connection refused"),
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#endif
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#if defined (EHOSTDOWN)
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ENTRY(EHOSTDOWN, "EHOSTDOWN", "Host is down"),
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#endif
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#if defined (EHOSTUNREACH)
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ENTRY(EHOSTUNREACH, "EHOSTUNREACH", "No route to host"),
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#endif
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#if defined (EALREADY)
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ENTRY(EALREADY, "EALREADY", "Operation already in progress"),
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#endif
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#if defined (EINPROGRESS)
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ENTRY(EINPROGRESS, "EINPROGRESS", "Operation now in progress"),
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#endif
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#if defined (ESTALE)
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ENTRY(ESTALE, "ESTALE", "Stale NFS file handle"),
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#endif
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#if defined (EUCLEAN)
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ENTRY(EUCLEAN, "EUCLEAN", "Structure needs cleaning"),
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#endif
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#if defined (ENOTNAM)
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ENTRY(ENOTNAM, "ENOTNAM", "Not a XENIX named type file"),
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#endif
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#if defined (ENAVAIL)
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ENTRY(ENAVAIL, "ENAVAIL", "No XENIX semaphores available"),
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#endif
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#if defined (EISNAM)
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ENTRY(EISNAM, "EISNAM", "Is a named type file"),
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#endif
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#if defined (EREMOTEIO)
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ENTRY(EREMOTEIO, "EREMOTEIO", "Remote I/O error"),
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#endif
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ENTRY(0, NULL, NULL)
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};
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#ifdef EVMSERR
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/* This is not in the table, because the numeric value of EVMSERR (32767)
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lies outside the range of sys_errlist[]. */
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static struct { int value; const char *name, *msg; }
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evmserr = { EVMSERR, "EVMSERR", "VMS-specific error" };
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#endif
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/* Translation table allocated and initialized at runtime. Indexed by the
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errno value to find the equivalent symbolic value. */
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static const char **error_names;
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static int num_error_names = 0;
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/* Translation table allocated and initialized at runtime, if it does not
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already exist in the host environment. Indexed by the errno value to find
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the descriptive string.
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We don't export it for use in other modules because even though it has the
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same name, it differs from other implementations in that it is dynamically
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initialized rather than statically initialized. */
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#ifndef HAVE_SYS_ERRLIST
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#define sys_nerr sys_nerr__
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#define sys_errlist sys_errlist__
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static int sys_nerr;
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static const char **sys_errlist;
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#else
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extern int sys_nerr;
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extern char *sys_errlist[];
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#endif
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/*
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NAME
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init_error_tables -- initialize the name and message tables
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SYNOPSIS
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static void init_error_tables ();
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DESCRIPTION
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Using the error_table, which is initialized at compile time, generate
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the error_names and the sys_errlist (if needed) tables, which are
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indexed at runtime by a specific errno value.
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BUGS
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The initialization of the tables may fail under low memory conditions,
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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))
|
|
{
|
|
/* 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);
|
|
}
|
|
|
|
/*
|
|
|
|
@deftypefn Extension int strtoerrno (const char *@var{name})
|
|
|
|
Given the symbolic name of a error number (e.g., @code{EACCES}), map it
|
|
to an errno value. If no translation is found, returns 0.
|
|
|
|
@end deftypefn
|
|
|
|
*/
|
|
|
|
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;
|
|
const 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
|