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Cygwin: set ENOSHARE and ECASECLASH _sys_errlist[] entries to empty

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These errno values are no longer used by Cygwin.  Change the entries
to empty strings instead of NULL to avoid crashes in existing
binaries directly accessing the table.  Enhance strerror_worker()
such that empty strings also result in "Unknown error ..." messages.
Also add a static_assert check for the _sys_errlist[] size.

Signed-off-by: Christian Franke <christian.franke@t-online.de>
This commit is contained in:
Christian Franke 2024-02-27 17:21:45 +01:00 committed by Corinna Vinschen
parent 6f996d7751
commit ee97ae1d5f
1 changed files with 9 additions and 3 deletions
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12
winsup/cygwin/errno.cc
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@ -167,8 +167,8 @@ const char *_sys_errlist[] =
/* ESTALE 133 */ "Stale NFS file handle",
/* ENOTSUP 134 */ "Not supported",
/* ENOMEDIUM 135 */ "No medium found",
/* ENOSHARE 136 */ "No such host or network path",
/* ECASECLASH 137 */ "Filename exists with different case",
"", /* Was ENOSHARE 136, no longer used. */
"", /* Was ECASECLASH 137, no longer used. */
/* EILSEQ 138 */ "Invalid or incomplete multibyte or wide character",
/* EOVERFLOW 139 */ "Value too large for defined data type",
/* ECANCELED 140 */ "Operation canceled",
@ -177,6 +177,8 @@ const char *_sys_errlist[] =
/* ESTRPIPE 143 */ "Streams pipe error"
};
static_assert(143 + 1 == sizeof (_sys_errlist) / sizeof (_sys_errlist[0]));
int NO_COPY_INIT _sys_nerr = sizeof (_sys_errlist) / sizeof (_sys_errlist[0]);
};
@ -228,7 +230,11 @@ strerror_worker (int errnum)
{
char *res;
if (errnum >= 0 && errnum < _sys_nerr)
res = (char *) _sys_errlist [errnum];
{
res = (char *) _sys_errlist [errnum];
if (res && !*res)
res = NULL;
}
else
res = NULL;
return res;