57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
//===-- VASPrintf.cpp -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Utility/VASPrintf.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallVector.h" // for SmallVectorImpl
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#include "llvm/ADT/StringRef.h" // for StringRef
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#include <assert.h> // for assert
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#include <stdarg.h> // for va_end, va_list, va_copy
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#include <stdio.h> // for vsnprintf, size_t
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bool lldb_private::VASprintf(llvm::SmallVectorImpl<char> &buf, const char *fmt,
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va_list args) {
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llvm::SmallString<16> error("<Encoding error>");
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bool result = true;
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// Copy in case our first call to vsnprintf doesn't fit into our buffer
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va_list copy_args;
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va_copy(copy_args, args);
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buf.resize(buf.capacity());
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// Write up to `capacity` bytes, ignoring the current size.
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int length = ::vsnprintf(buf.data(), buf.size(), fmt, args);
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if (length < 0) {
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buf = error;
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result = false;
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goto finish;
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}
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if (size_t(length) >= buf.size()) {
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// The error formatted string didn't fit into our buffer, resize it
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// to the exact needed size, and retry
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buf.resize(length + 1);
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length = ::vsnprintf(buf.data(), buf.size(), fmt, copy_args);
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if (length < 0) {
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buf = error;
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result = false;
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goto finish;
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}
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assert(size_t(length) < buf.size());
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}
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buf.resize(length);
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finish:
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va_end(args);
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va_end(copy_args);
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return result;
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}
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