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67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/* xstrerror.c -- jacket routine for more robust strerror() usage.
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Fri Jun 16 18:30:00 1995 Pat Rankin <rankin@eql.caltech.edu>
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This code is in the public domain. */
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/*
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@deftypefn Replacement char* xstrerror (int @var{errnum})
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Behaves exactly like the standard @code{strerror} function, but
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will never return a @code{NULL} pointer.
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@end deftypefn
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*/
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#include <stdio.h>
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#include "config.h"
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#include "libiberty.h"
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#ifdef VMS
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#include <errno.h>
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#if !defined (__STRICT_ANSI__) && !defined (__HIDE_FORBIDDEN_NAMES)
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extern char *strerror (int,...);
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#define DONT_DECLARE_STRERROR
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#endif
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#endif /* VMS */
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#ifndef DONT_DECLARE_STRERROR
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extern char *strerror (int);
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#endif
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/* If strerror returns NULL, we'll format the number into a static buffer. */
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#define ERRSTR_FMT "undocumented error #%d"
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static char xstrerror_buf[sizeof ERRSTR_FMT + 20];
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/* Like strerror, but result is never a null pointer. */
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char *
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xstrerror (int errnum)
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{
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char *errstr;
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#ifdef VMS
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char *(*vmslib_strerror) (int,...);
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/* Override any possibly-conflicting declaration from system header. */
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vmslib_strerror = (char *(*) (int,...)) strerror;
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/* Second argument matters iff first is EVMSERR, but it's simpler to
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pass it unconditionally. `vaxc$errno' is declared in <errno.h>
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and maintained by the run-time library in parallel to `errno'.
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We assume that `errnum' corresponds to the last value assigned to
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errno by the run-time library, hence vaxc$errno will be relevant. */
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errstr = (*vmslib_strerror) (errnum, vaxc$errno);
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#else
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errstr = strerror (errnum);
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#endif
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/* If `errnum' is out of range, result might be NULL. We'll fix that. */
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if (!errstr)
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{
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sprintf (xstrerror_buf, ERRSTR_FMT, errnum);
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errstr = xstrerror_buf;
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}
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return errstr;
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}
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