1 //===-- Implementation of strfromf ------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "src/stdlib/strfromf.h" 10 #include "src/__support/macros/config.h" 11 #include "src/stdlib/str_from_util.h" 12 13 namespace LIBC_NAMESPACE_DECL { 14 15 LLVM_LIBC_FUNCTION(int, strfromf, 16 (char *__restrict s, size_t n, const char *__restrict format, 17 float fp)) { 18 LIBC_ASSERT(s != nullptr); 19 20 printf_core::FormatSection section = 21 internal::parse_format_string(format, fp); 22 printf_core::WriteBuffer wb(s, (n > 0 ? n - 1 : 0)); 23 printf_core::Writer writer(&wb); 24 25 int result = 0; 26 if (section.has_conv) 27 result = internal::strfromfloat_convert<float>(&writer, section); 28 else 29 result = writer.write(section.raw_string); 30 31 if (result < 0) 32 return result; 33 34 if (n > 0) 35 wb.buff[wb.buff_cur] = '\0'; 36 37 return writer.get_chars_written(); 38 } 39 40 } // namespace LIBC_NAMESPACE_DECL 41