| 1 | /* xstrerror.c -- jacket routine for more robust strerror() usage. |
| 2 | Fri Jun 16 18:30:00 1995 Pat Rankin <rankin@eql.caltech.edu> |
| 3 | This code is in the public domain. */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | |
| 7 | #include "libiberty.h" |
| 8 | #include "config.h" |
| 9 | |
| 10 | #ifdef VMS |
| 11 | #include <errno.h> |
| 12 | #if !defined (__STRICT_ANSI__) && !defined (__HIDE_FORBIDDEN_NAMES) |
| 13 | extern char *strerror PARAMS ((int,...)); |
| 14 | #define DONT_DECLARE_STRERROR |
| 15 | #endif |
| 16 | #endif /* VMS */ |
| 17 | |
| 18 | #ifndef DONT_DECLARE_STRERROR |
| 19 | extern char *strerror PARAMS ((int)); |
| 20 | #endif |
| 21 | |
| 22 | /* If strerror returns NULL, we'll format the number into a static buffer. */ |
| 23 | |
| 24 | #define ERRSTR_FMT "undocumented error #%d" |
| 25 | static char xstrerror_buf[sizeof ERRSTR_FMT + 20]; |
| 26 | |
| 27 | /* Like strerror, but result is never a null pointer. */ |
| 28 | |
| 29 | char * |
| 30 | xstrerror (errnum) |
| 31 | int errnum; |
| 32 | { |
| 33 | char *errstr; |
| 34 | #ifdef VMS |
| 35 | char *(*vmslib_strerror) PARAMS ((int,...)); |
| 36 | |
| 37 | /* Override any possibly-conflicting declaration from system header. */ |
| 38 | vmslib_strerror = (char *(*) PARAMS ((int,...))) strerror; |
| 39 | /* Second argument matters iff first is EVMSERR, but it's simpler to |
| 40 | pass it unconditionally. `vaxc$errno' is declared in <errno.h> |
| 41 | and maintained by the run-time library in parallel to `errno'. |
| 42 | We assume that `errnum' corresponds to the last value assigned to |
| 43 | errno by the run-time library, hence vaxc$errno will be relevant. */ |
| 44 | errstr = (*vmslib_strerror) (errnum, vaxc$errno); |
| 45 | #else |
| 46 | errstr = strerror (errnum); |
| 47 | #endif |
| 48 | |
| 49 | /* If `errnum' is out of range, result might be NULL. We'll fix that. */ |
| 50 | if (!errstr) |
| 51 | { |
| 52 | sprintf (xstrerror_buf, ERRSTR_FMT, errnum); |
| 53 | errstr = xstrerror_buf; |
| 54 | } |
| 55 | return errstr; |
| 56 | } |