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