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  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. /*
  6.  
  7. @deftypefn Replacement char* xstrerror (int @var{errnum})
  8.  
  9. Behaves exactly like the standard @code{strerror} function, but
  10. will never return a @code{NULL} pointer.
  11.  
  12. @end deftypefn
  13.  
  14. */
  15.  
  16. #include <stdio.h>
  17.  
  18. #include "config.h"
  19. #include "libiberty.h"
  20.  
  21. #ifdef VMS
  22. #  include <errno.h>
  23. #  if !defined (__STRICT_ANSI__) && !defined (__HIDE_FORBIDDEN_NAMES)
  24. #    ifdef __cplusplus
  25. extern "C" {
  26. #    endif /* __cplusplus */
  27. extern char *strerror (int,...);
  28. #    define DONT_DECLARE_STRERROR
  29. #    ifdef __cplusplus
  30. }
  31. #    endif /* __cplusplus */
  32. #  endif
  33. #endif  /* VMS */
  34.  
  35.  
  36. #ifndef DONT_DECLARE_STRERROR
  37. #  ifdef __cplusplus
  38. extern "C" {
  39. #  endif /* __cplusplus */
  40. extern char *strerror (int);
  41. #  ifdef __cplusplus
  42. }
  43. #  endif /* __cplusplus */
  44. #endif
  45.  
  46. /* If strerror returns NULL, we'll format the number into a static buffer.  */
  47.  
  48. #define ERRSTR_FMT "undocumented error #%d"
  49. static char xstrerror_buf[sizeof ERRSTR_FMT + 20];
  50.  
  51. /* Like strerror, but result is never a null pointer.  */
  52.  
  53. char *
  54. xstrerror (int errnum)
  55. {
  56.   char *errstr;
  57. #ifdef VMS
  58.   char *(*vmslib_strerror) (int,...);
  59.  
  60.   /* Override any possibly-conflicting declaration from system header.  */
  61.   vmslib_strerror = (char *(*) (int,...)) strerror;
  62.   /* Second argument matters iff first is EVMSERR, but it's simpler to
  63.      pass it unconditionally.  `vaxc$errno' is declared in <errno.h>
  64.      and maintained by the run-time library in parallel to `errno'.
  65.      We assume that `errnum' corresponds to the last value assigned to
  66.      errno by the run-time library, hence vaxc$errno will be relevant.  */
  67.   errstr = (*vmslib_strerror) (errnum, vaxc$errno);
  68. #else
  69.   errstr = strerror (errnum);
  70. #endif
  71.  
  72.   /* If `errnum' is out of range, result might be NULL.  We'll fix that.  */
  73.   if (!errstr)
  74.     {
  75.       sprintf (xstrerror_buf, ERRSTR_FMT, errnum);
  76.       errstr = xstrerror_buf;
  77.     }
  78.   return errstr;
  79. }
  80.