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[libc] Implement strfromd() and strfroml() (llvm#86113)
Follow up to llvm#85438. Implements the functions `strfromd()` and `strfroml()` introduced in C23, and unifies the testing framework for `strfrom*()` functions.
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//===-- Implementation of strfromd ------------------------------*- 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#include "src/stdlib/strfromd.h" | ||
#include "src/stdlib/str_from_util.h" | ||
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#include <stdarg.h> | ||
#include <stddef.h> | ||
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namespace LIBC_NAMESPACE { | ||
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LLVM_LIBC_FUNCTION(int, strfromd, | ||
(char *__restrict s, size_t n, const char *__restrict format, | ||
double fp)) { | ||
LIBC_ASSERT(s != nullptr); | ||
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printf_core::FormatSection section = | ||
internal::parse_format_string(format, fp); | ||
printf_core::WriteBuffer wb(s, (n > 0 ? n - 1 : 0)); | ||
printf_core::Writer writer(&wb); | ||
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int result = 0; | ||
if (section.has_conv) | ||
result = internal::strfromfloat_convert<double>(&writer, section); | ||
else | ||
result = writer.write(section.raw_string); | ||
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if (result < 0) | ||
return result; | ||
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if (n > 0) | ||
wb.buff[wb.buff_cur] = '\0'; | ||
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return writer.get_chars_written(); | ||
} | ||
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} // namespace LIBC_NAMESPACE |
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//===-- Implementation header for strfromd ------------------------*- 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#ifndef LLVM_LIBC_SRC_STDLIB_STRFROMD_H | ||
#define LLVM_LIBC_SRC_STDLIB_STRFROMD_H | ||
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#include <stddef.h> | ||
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namespace LIBC_NAMESPACE { | ||
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int strfromd(char *__restrict s, size_t n, const char *__restrict format, | ||
double fp); | ||
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} // namespace LIBC_NAMESPACE | ||
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#endif // LLVM_LIBC_SRC_STDLIB_STRFROMD_H |
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//===-- Implementation of strfroml ------------------------------*- 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#include "src/stdlib/strfroml.h" | ||
#include "src/stdlib/str_from_util.h" | ||
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#include <stdarg.h> | ||
#include <stddef.h> | ||
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namespace LIBC_NAMESPACE { | ||
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LLVM_LIBC_FUNCTION(int, strfroml, | ||
(char *__restrict s, size_t n, const char *__restrict format, | ||
long double fp)) { | ||
LIBC_ASSERT(s != nullptr); | ||
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printf_core::FormatSection section = | ||
internal::parse_format_string(format, fp); | ||
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// To ensure that the conversion function actually uses long double, | ||
// the length modifier has to be set to LenghtModifier::L | ||
section.length_modifier = printf_core::LengthModifier::L; | ||
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printf_core::WriteBuffer wb(s, (n > 0 ? n - 1 : 0)); | ||
printf_core::Writer writer(&wb); | ||
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int result = 0; | ||
if (section.has_conv) | ||
result = internal::strfromfloat_convert<long double>(&writer, section); | ||
else | ||
result = writer.write(section.raw_string); | ||
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if (result < 0) | ||
return result; | ||
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if (n > 0) | ||
wb.buff[wb.buff_cur] = '\0'; | ||
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return writer.get_chars_written(); | ||
} | ||
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} // namespace LIBC_NAMESPACE |
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@@ -0,0 +1,21 @@ | ||
//===-- Implementation header for strfroml ------------------------*- 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#ifndef LLVM_LIBC_SRC_STDLIB_STRFROML_H | ||
#define LLVM_LIBC_SRC_STDLIB_STRFROML_H | ||
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#include <stddef.h> | ||
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namespace LIBC_NAMESPACE { | ||
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int strfroml(char *__restrict s, size_t n, const char *__restrict format, | ||
long double fp); | ||
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} // namespace LIBC_NAMESPACE | ||
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#endif // LLVM_LIBC_SRC_STDLIB_STRFROML_H |
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