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a535be4ea0
This function REQUIRES the size of the target buffer as well as the length of the source string. Meant to make it harder to do a bad strcpy(). Removes 23 calls to strcpy(). Closes #20067
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "../curl_setup.h"
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/*
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* curlx_winapi_strerror:
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* Variant of curlx_strerror if the error code is definitely Windows API.
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*/
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#ifdef _WIN32
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#include "winapi.h"
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#include "snprintf.h"
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#include "strcopy.h"
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/* This is a helper function for curlx_strerror that converts Windows API error
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* codes (GetLastError) to error messages.
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* Returns NULL if no error message was found for error code.
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*/
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const char *curlx_get_winapi_error(DWORD err, char *buf, size_t buflen)
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{
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char *p;
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wchar_t wbuf[256];
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DWORD wlen;
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if(!buflen)
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return NULL;
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*buf = '\0';
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*wbuf = L'\0';
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/* We return the local codepage version of the error string because if it is
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output to the user's terminal it will likely be with functions which
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expect the local codepage (eg fprintf, failf, infof). */
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wlen = FormatMessageW((FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS), NULL, err,
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LANG_NEUTRAL, wbuf, CURL_ARRAYSIZE(wbuf), NULL);
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if(wlen && !wcstombs_s(NULL, buf, buflen, wbuf, wlen)) {
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/* Truncate multiple lines */
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p = strchr(buf, '\n');
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if(p) {
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if(p > buf && *(p - 1) == '\r')
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*(p - 1) = '\0';
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else
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*p = '\0';
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}
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}
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return *buf ? buf : NULL;
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}
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const char *curlx_winapi_strerror(DWORD err, char *buf, size_t buflen)
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{
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DWORD old_win_err = GetLastError();
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int old_errno = errno;
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if(!buflen)
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return NULL;
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*buf = '\0';
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#ifndef CURL_DISABLE_VERBOSE_STRINGS
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if(!curlx_get_winapi_error(err, buf, buflen)) {
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#if defined(__GNUC__) && __GNUC__ >= 7
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#pragma GCC diagnostic push
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#pragma GCC diagnostic warning "-Wformat-truncation=1"
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#endif
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/* some GCC compilers cause false positive warnings if we allow this
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warning */
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SNPRINTF(buf, buflen, "Unknown error %lu (0x%08lx)", err, err);
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#if defined(__GNUC__) && __GNUC__ >= 7
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#pragma GCC diagnostic pop
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#endif
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}
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#else
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{
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const char *txt = (err == ERROR_SUCCESS) ? "No error" : "Error";
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curlx_strcopy(buf, buflen, txt, strlen(txt));
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}
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#endif
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if(errno != old_errno)
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errno = old_errno;
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if(old_win_err != GetLastError())
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SetLastError(old_win_err);
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return buf;
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}
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#endif /* _WIN32 */
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