xref: /external/ceres-solver/internal/ceres/stringprintf.h

// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
// http://code.google.com/p/ceres-solver/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors may be
//   used to endorse or promote products derived from this software without
//   specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Author: Sanjay Ghemawat
//
// Printf variants that place their output in a C++ string.
//
// Usage:
//      string result = StringPrintf("%d %s\n", 10, "hello");
//      SStringPrintf(&result, "%d %s\n", 10, "hello");
//      StringAppendF(&result, "%d %s\n", 20, "there");

#ifndef CERES_INTERNAL_STRINGPRINTF_H_
#define CERES_INTERNAL_STRINGPRINTF_H_

#include <cstdarg>
#include <string>

#include "ceres/internal/port.h"

namespace ceres {
namespace internal {

#if (defined(__GNUC__) || defined(__clang__))
// Tell the compiler to do printf format string checking if the compiler
// supports it; see the 'format' attribute in
// <http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Function-Attributes.html>.
//
// N.B.: As the GCC manual states, "[s]ince non-static C++ methods
// have an implicit 'this' argument, the arguments of such methods
// should be counted from two, not one."
#define CERES_PRINTF_ATTRIBUTE(string_index, first_to_check) \
    __attribute__((__format__ (__printf__, string_index, first_to_check)))
#define CERES_SCANF_ATTRIBUTE(string_index, first_to_check) \
    __attribute__((__format__ (__scanf__, string_index, first_to_check)))
#else
#define CERES_PRINTF_ATTRIBUTE(string_index, first_to_check)
#endif

// Return a C++ string.
extern string StringPrintf(const char* format, ...)
    // Tell the compiler to do printf format string checking.
    CERES_PRINTF_ATTRIBUTE(1, 2);

// Store result into a supplied string and return it.
extern const string& SStringPrintf(string* dst, const char* format, ...)
    // Tell the compiler to do printf format string checking.
    CERES_PRINTF_ATTRIBUTE(2, 3);

// Append result to a supplied string.
extern void StringAppendF(string* dst, const char* format, ...)
    // Tell the compiler to do printf format string checking.
    CERES_PRINTF_ATTRIBUTE(2, 3);

// Lower-level routine that takes a va_list and appends to a specified string.
// All other routines are just convenience wrappers around it.
extern void StringAppendV(string* dst, const char* format, va_list ap);

#undef CERES_PRINTF_ATTRIBUTE

}  // namespace internal
}  // namespace ceres

#endif  // CERES_INTERNAL_STRINGPRINTF_H_