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558a931409
Change-Id: I552086445a7e07792f9da85afa5edf23b6c450d5 Reviewed-on: https://dart-review.googlesource.com/44402 Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "platform/globals.h"
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#if defined(HOST_OS_WINDOWS)
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#include "platform/utils.h"
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namespace dart {
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char* Utils::StrNDup(const char* s, intptr_t n) {
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intptr_t len = strlen(s);
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if ((n < 0) || (len < 0)) {
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return NULL;
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}
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if (n < len) {
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len = n;
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}
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char* result = reinterpret_cast<char*>(malloc(len + 1));
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if (result == NULL) {
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return NULL;
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}
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result[len] = '\0';
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return reinterpret_cast<char*>(memmove(result, s, len));
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}
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intptr_t Utils::StrNLen(const char* s, intptr_t n) {
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return strnlen(s, n);
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}
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int Utils::SNPrint(char* str, size_t size, const char* format, ...) {
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va_list args;
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va_start(args, format);
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int retval = VSNPrint(str, size, format, args);
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va_end(args);
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return retval;
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}
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int Utils::VSNPrint(char* str, size_t size, const char* format, va_list args) {
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if (str == NULL || size == 0) {
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int retval = _vscprintf(format, args);
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if (retval < 0) {
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FATAL1("Fatal error in Utils::VSNPrint with format '%s'", format);
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}
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return retval;
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}
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va_list args_copy;
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va_copy(args_copy, args);
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int written = _vsnprintf(str, size, format, args_copy);
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va_end(args_copy);
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if (written < 0) {
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// _vsnprintf returns -1 if the number of characters to be written is
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// larger than 'size', so we call _vscprintf which returns the number
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// of characters that would have been written.
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va_list args_retry;
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va_copy(args_retry, args);
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written = _vscprintf(format, args_retry);
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if (written < 0) {
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FATAL1("Fatal error in Utils::VSNPrint with format '%s'", format);
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}
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va_end(args_retry);
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}
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// Make sure to zero-terminate the string if the output was
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// truncated or if there was an error.
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// The static cast is safe here as we have already determined that 'written'
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// is >= 0.
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if (static_cast<size_t>(written) >= size) {
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str[size - 1] = '\0';
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}
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return written;
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}
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} // namespace dart
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#endif // defined(HOST_OS_WINDOWS)
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