diff options
Diffstat (limited to 'libs/libcurl/src/curlx/winapi.c')
| -rw-r--r-- | libs/libcurl/src/curlx/winapi.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libs/libcurl/src/curlx/winapi.c b/libs/libcurl/src/curlx/winapi.c new file mode 100644 index 0000000000..60eddc23f2 --- /dev/null +++ b/libs/libcurl/src/curlx/winapi.c @@ -0,0 +1,135 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#include "../curl_setup.h"
+
+/*
+ * curlx_winapi_strerror:
+ * Variant of Curl_strerror if the error code is definitely Windows API.
+ */
+#ifdef _WIN32
+#include "winapi.h"
+
+#ifdef BUILDING_LIBCURL
+#include <curl/mprintf.h>
+#define SNPRINTF curl_msnprintf
+#else
+/* when built for the test servers */
+
+/* adjust for old MSVC */
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+# define SNPRINTF _snprintf
+#else
+#define SNPRINTF snprintf
+#endif
+
+#endif /* !BUILDING_LIBCURL */
+
+#ifdef _WIN32
+/* This is a helper function for Curl_strerror that converts Windows API error
+ * codes (GetLastError) to error messages.
+ * Returns NULL if no error message was found for error code.
+ */
+const char *curlx_get_winapi_error(int err, char *buf, size_t buflen)
+{
+ char *p;
+ wchar_t wbuf[256];
+
+ if(!buflen)
+ return NULL;
+
+ *buf = '\0';
+ *wbuf = L'\0';
+
+ /* We return the local codepage version of the error string because if it is
+ output to the user's terminal it will likely be with functions which
+ expect the local codepage (eg fprintf, failf, infof).
+ FormatMessageW -> wcstombs is used for Windows CE compatibility. */
+ if(FormatMessageW((FORMAT_MESSAGE_FROM_SYSTEM |
+ FORMAT_MESSAGE_IGNORE_INSERTS), NULL, (DWORD)err,
+ LANG_NEUTRAL, wbuf, CURL_ARRAYSIZE(wbuf), NULL)) {
+ size_t written = wcstombs(buf, wbuf, buflen - 1);
+ if(written != (size_t)-1)
+ buf[written] = '\0';
+ else
+ *buf = '\0';
+ }
+
+ /* Truncate multiple lines */
+ p = strchr(buf, '\n');
+ if(p) {
+ if(p > buf && *(p-1) == '\r')
+ *(p-1) = '\0';
+ else
+ *p = '\0';
+ }
+
+ return *buf ? buf : NULL;
+}
+#endif /* _WIN32 */
+
+const char *curlx_winapi_strerror(DWORD err, char *buf, size_t buflen)
+{
+#ifdef _WIN32
+ DWORD old_win_err = GetLastError();
+#endif
+ int old_errno = errno;
+
+ if(!buflen)
+ return NULL;
+
+ *buf = '\0';
+
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
+ if(!curlx_get_winapi_error((int)err, buf, buflen)) {
+#if defined(__GNUC__) && __GNUC__ >= 7
+#pragma GCC diagnostic push
+#pragma GCC diagnostic warning "-Wformat-truncation=1"
+#endif
+ /* some GCC compilers cause false positive warnings if we allow this
+ warning */
+ SNPRINTF(buf, buflen, "Unknown error %lu (0x%08lX)", err, err);
+#if defined(__GNUC__) && __GNUC__ >= 7
+#pragma GCC diagnostic pop
+#endif
+
+ }
+#else
+ {
+ const char *txt = (err == ERROR_SUCCESS) ? "No error" : "Error";
+ if(strlen(txt) < buflen)
+ strcpy(buf, txt);
+ }
+#endif
+
+ if(errno != old_errno)
+ CURL_SETERRNO(old_errno);
+
+#ifdef _WIN32
+ if(old_win_err != GetLastError())
+ SetLastError(old_win_err);
+#endif
+
+ return buf;
+}
+#endif /* _WIN32 */
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