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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