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