bc20b9dac9
Merged from go/wvgerrit/178231 Bug: 290252845 Test: WVTS tests seem to be running and passing Change-Id: Ifff9123a73e173e835a6e89ba7c2760e1cd500fd (cherry picked from commit 6889845d2e7e24f22c00b333335c34259b3fc96e)
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
// Copyright 2022 Google LLC. All Rights Reserved. This file and proprietary
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// source code may only be used and distributed under the Widevine License
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// Agreement.
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#include "string_format.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <memory>
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namespace wvutil {
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bool FormatString(std::string* out, const char* fmt, ...) {
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if (out == nullptr || fmt == nullptr) return false;
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va_list vlist;
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va_start(vlist, fmt);
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const bool result = VFormatString(out, fmt, vlist);
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va_end(vlist);
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return result;
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}
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bool VFormatString(std::string* out, const char* fmt, va_list vlist) {
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if (out == nullptr || fmt == nullptr) return false;
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va_list vlist_copy;
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va_copy(vlist_copy, vlist);
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const int desired_size = vsnprintf(nullptr, 0, fmt, vlist_copy);
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va_end(vlist_copy);
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if (desired_size < 0) return false;
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const size_t buffer_size =
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static_cast<size_t>(desired_size) + 1; // +1 for null
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std::unique_ptr<char[]> buffer(new char[buffer_size]);
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const int actual_size = vsnprintf(buffer.get(), buffer_size, fmt, vlist);
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if (actual_size != desired_size) return false;
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out->assign(buffer.get(), actual_size);
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return true;
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}
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} // namespace wvutil
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