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//===-- Implementation of snprintf ------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/stdio/snprintf.h"
#include "src/__support/CPP/limits.h"
#include "src/__support/arg_list.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/stdio/printf_core/core_structs.h"
#include "src/stdio/printf_core/error_mapper.h"
#include "src/stdio/printf_core/printf_main.h"
#include "src/stdio/printf_core/writer.h"
#include <stdarg.h>
#include <stddef.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, snprintf,
(char *__restrict buffer, size_t buffsz,
const char *__restrict format, ...)) {
va_list vlist;
va_start(vlist, format);
internal::ArgList args(vlist); // This holder class allows for easier copying
// and pointer semantics, as well as handling
// destruction automatically.
va_end(vlist);
printf_core::DropOverflowBuffer wb(buffer, (buffsz > 0 ? buffsz - 1 : 0));
printf_core::Writer writer(wb);
auto ret_val = printf_core::printf_main(&writer, format, args);
if (!ret_val.has_value()) {
libc_errno = printf_core::internal_error_to_errno(ret_val.error());
return -1;
}
if (buffsz > 0) // if the buffsz is 0 the buffer may be a null pointer.
wb.buff[wb.buff_cur] = '\0';
if (ret_val.value() > static_cast<size_t>(cpp::numeric_limits<int>::max())) {
libc_errno =
printf_core::internal_error_to_errno(-printf_core::OVERFLOW_ERROR);
return -1;
}
return static_cast<int>(ret_val.value());
}
} // namespace LIBC_NAMESPACE_DECL
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