ff73463d0b
(Merged from http://go/wvgerrit/160042.) Since we don't have access to std::format yet, this patch adds a function to wvutil to format text into a std::string. Bug: 255466913 Test: x86-64 Test: raven Change-Id: I28043da76af5b4772a29fa7e7241343caf9b54a1
41 lines
988 B
C++
41 lines
988 B
C++
// Copyright 2022 Google LLC. All Rights Reserved. This file and proprietary
|
|
// source code may only be used and distributed under the Widevine License
|
|
// Agreement.
|
|
|
|
#include "string_format.h"
|
|
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <memory>
|
|
|
|
namespace wvutil {
|
|
|
|
bool FormatString(std::string* out, const char* fmt, ...) {
|
|
if (out == nullptr || fmt == nullptr) return false;
|
|
|
|
va_list ap1;
|
|
va_start(ap1, fmt);
|
|
const int desired_size = vsnprintf(nullptr, 0, fmt, ap1);
|
|
va_end(ap1);
|
|
|
|
if (desired_size < 0) return false;
|
|
const size_t buffer_size =
|
|
static_cast<size_t>(desired_size) + 1; // +1 for null
|
|
std::unique_ptr<char[]> buffer(new char[buffer_size]);
|
|
|
|
va_list ap2;
|
|
va_start(ap2, fmt);
|
|
const int actual_size = vsnprintf(buffer.get(), buffer_size, fmt, ap2);
|
|
va_end(ap2);
|
|
|
|
if (actual_size != desired_size) return false;
|
|
|
|
out->assign(buffer.get(), actual_size);
|
|
return true;
|
|
}
|
|
|
|
} // namespace wvutil
|