7efcd6198c
This adds LIBC_CONF_PRINTF_MODULAR, which causes floating point support (later, others) to be weakly linked into the implementation. __printf_modular becomes the main entry point of the implementaiton, an printf itself wraps __printf_modular. printf it also contains a BFD_RELOC_NONE relocation to bring in the float aspect. See issue #146159 for context.
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
//===-- Implementation of snprintf ------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/stdio/snprintf.h"
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#include "src/__support/CPP/limits.h"
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#include "src/__support/arg_list.h"
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#include "src/__support/libc_errno.h"
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#include "src/__support/macros/config.h"
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#include "src/stdio/printf_core/core_structs.h"
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#include "src/stdio/printf_core/error_mapper.h"
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#include "src/stdio/printf_core/printf_main.h"
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#include "src/stdio/printf_core/writer.h"
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#include <stdarg.h>
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#include <stddef.h>
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namespace LIBC_NAMESPACE_DECL {
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LLVM_LIBC_FUNCTION(int, snprintf,
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(char *__restrict buffer, size_t buffsz,
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const char *__restrict format, ...)) {
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va_list vlist;
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va_start(vlist, format);
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internal::ArgList args(vlist); // This holder class allows for easier copying
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// and pointer semantics, as well as handling
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// destruction automatically.
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va_end(vlist);
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printf_core::DropOverflowBuffer wb(buffer, (buffsz > 0 ? buffsz - 1 : 0));
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printf_core::Writer writer(wb);
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#ifdef LIBC_COPT_PRINTF_MODULAR
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LIBC_INLINE_ASM(".reloc ., BFD_RELOC_NONE, __printf_float");
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auto ret_val = printf_core::printf_main_modular(&writer, format, args);
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#else
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auto ret_val = printf_core::printf_main(&writer, format, args);
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#endif
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if (!ret_val.has_value()) {
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libc_errno = printf_core::internal_error_to_errno(ret_val.error());
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return -1;
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}
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if (buffsz > 0) // if the buffsz is 0 the buffer may be a null pointer.
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wb.buff[wb.buff_cur] = '\0';
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if (ret_val.value() > static_cast<size_t>(cpp::numeric_limits<int>::max())) {
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libc_errno =
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printf_core::internal_error_to_errno(-printf_core::OVERFLOW_ERROR);
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return -1;
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}
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return static_cast<int>(ret_val.value());
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}
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} // namespace LIBC_NAMESPACE_DECL
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