1 /* $MirOS: src/gnu/usr.bin/binutils/libiberty/xstrerror.c,v 1.4 2005/06/05 21:24:47 tg Exp $ */
2
3 /* xstrerror.c -- jacket routine for more robust strerror() usage.
4 Fri Jun 16 18:30:00 1995 Pat Rankin <rankin@eql.caltech.edu>
5 This code is in the public domain. */
6
7 /*
8
9 @deftypefn Replacement char* xstrerror (int @var{errnum})
10
11 Behaves exactly like the standard @code{strerror} function, but
12 will never return a @code{NULL} pointer.
13
14 @end deftypefn
15
16 */
17
18 #include <stdio.h>
19
20 #include "config.h"
21 #include "libiberty.h"
22
23 __RCSID("$MirOS: src/gnu/usr.bin/binutils/libiberty/xstrerror.c,v 1.4 2005/06/05 21:24:47 tg Exp $");
24
25 #ifdef VMS
26 # include <errno.h>
27 # if !defined (__STRICT_ANSI__) && !defined (__HIDE_FORBIDDEN_NAMES)
28 # ifdef __cplusplus
29 extern "C" {
30 # endif /* __cplusplus */
31 extern char *strerror (int,...);
32 # define DONT_DECLARE_STRERROR
33 # ifdef __cplusplus
34 }
35 # endif /* __cplusplus */
36 # endif
37 #endif /* VMS */
38
39
40 #ifndef DONT_DECLARE_STRERROR
41 # ifdef __cplusplus
42 extern "C" {
43 # endif /* __cplusplus */
44 extern char *strerror (int);
45 # ifdef __cplusplus
46 }
47 # endif /* __cplusplus */
48 #endif
49
50 /* If strerror returns NULL, we'll format the number into a static buffer. */
51
52 #define ERRSTR_FMT "undocumented error #%d"
53 static char xstrerror_buf[sizeof ERRSTR_FMT + 20];
54
55 /* Like strerror, but result is never a null pointer. */
56
57 char *
xstrerror(int errnum)58 xstrerror (int errnum)
59 {
60 char *errstr;
61 #ifdef VMS
62 char *(*vmslib_strerror) (int,...);
63
64 /* Override any possibly-conflicting declaration from system header. */
65 vmslib_strerror = (char *(*) (int,...)) strerror;
66 /* Second argument matters iff first is EVMSERR, but it's simpler to
67 pass it unconditionally. `vaxc$errno' is declared in <errno.h>
68 and maintained by the run-time library in parallel to `errno'.
69 We assume that `errnum' corresponds to the last value assigned to
70 errno by the run-time library, hence vaxc$errno will be relevant. */
71 errstr = (*vmslib_strerror) (errnum, vaxc$errno);
72 #else
73 errstr = strerror (errnum);
74 #endif
75
76 /* If `errnum' is out of range, result might be NULL. We'll fix that. */
77 if (!errstr)
78 {
79 snprintf (xstrerror_buf, sizeof(ERRSTR_FMT) + 20, ERRSTR_FMT, errnum);
80 errstr = xstrerror_buf;
81 }
82 return errstr;
83 }
84