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1 /* xstrerror.c -- jacket routine for more robust strerror() usage.
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2 Fri Jun 16 18:30:00 1995 Pat Rankin <rankin@eql.caltech.edu>
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3 This code is in the public domain. */
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4
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5 /*
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6
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7 @deftypefn Replacement char* xstrerror (int @var{errnum})
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8
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9 Behaves exactly like the standard @code{strerror} function, but
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10 will never return a @code{NULL} pointer.
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11
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12 @end deftypefn
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13
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14 */
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15
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16 #include <stdio.h>
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17
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18 #include "config.h"
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19 #include "libiberty.h"
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20
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21 #ifdef VMS
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22 # include <errno.h>
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23 # if !defined (__STRICT_ANSI__) && !defined (__HIDE_FORBIDDEN_NAMES)
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24 # ifdef __cplusplus
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25 extern "C" {
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26 # endif /* __cplusplus */
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27 extern char *strerror (int,...);
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28 # define DONT_DECLARE_STRERROR
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29 # ifdef __cplusplus
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30 }
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31 # endif /* __cplusplus */
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32 # endif
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33 #endif /* VMS */
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34
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35
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36 #ifndef DONT_DECLARE_STRERROR
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37 # ifdef __cplusplus
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38 extern "C" {
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39 # endif /* __cplusplus */
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40 extern char *strerror (int);
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41 # ifdef __cplusplus
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42 }
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43 # endif /* __cplusplus */
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44 #endif
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45
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46 /* If strerror returns NULL, we'll format the number into a static buffer. */
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47
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48 #define ERRSTR_FMT "undocumented error #%d"
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49 static char xstrerror_buf[sizeof ERRSTR_FMT + 20];
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50
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51 /* Like strerror, but result is never a null pointer. */
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52
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53 char *
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54 xstrerror (int errnum)
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55 {
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56 char *errstr;
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57 #ifdef VMS
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58 char *(*vmslib_strerror) (int,...);
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59
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60 /* Override any possibly-conflicting declaration from system header. */
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61 vmslib_strerror = (char *(*) (int,...)) strerror;
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62 /* Second argument matters iff first is EVMSERR, but it's simpler to
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63 pass it unconditionally. `vaxc$errno' is declared in <errno.h>
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64 and maintained by the run-time library in parallel to `errno'.
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65 We assume that `errnum' corresponds to the last value assigned to
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66 errno by the run-time library, hence vaxc$errno will be relevant. */
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67 errstr = (*vmslib_strerror) (errnum, vaxc$errno);
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68 #else
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69 errstr = strerror (errnum);
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70 #endif
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71
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72 /* If `errnum' is out of range, result might be NULL. We'll fix that. */
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73 if (!errstr)
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74 {
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75 sprintf (xstrerror_buf, ERRSTR_FMT, errnum);
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76 errstr = xstrerror_buf;
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77 }
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78 return errstr;
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79 }
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