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| 1 | //===-- Internal Implementation of asprintf ---------------------*- 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 "hdr/func/free.h" |
| 10 | #include "hdr/func/malloc.h" |
| 11 | #include "hdr/func/realloc.h" |
| 12 | #include "src/__support/arg_list.h" |
| 13 | #include "src/stdio/printf.h" |
| 14 | #include "src/stdio/printf_core/core_structs.h" |
| 15 | #include "src/stdio/printf_core/printf_main.h" |
| 16 | #include "src/stdio/printf_core/writer.h" |
| 17 | |
| 18 | namespace LIBC_NAMESPACE_DECL { |
| 19 | namespace printf_core { |
| 20 | |
| 21 | LIBC_INLINE int resize_overflow_hook(cpp::string_view new_str, void *target) { |
| 22 | WriteBuffer<Mode<WriteMode::RESIZE_AND_FILL_BUFF>::value> *wb = |
| 23 | reinterpret_cast< |
| 24 | WriteBuffer<Mode<WriteMode::RESIZE_AND_FILL_BUFF>::value> *>(target); |
| 25 | size_t new_size = new_str.size() + wb->buff_cur; |
| 26 | const bool isBuffOnStack = (wb->buff == wb->init_buff); |
| 27 | char *new_buff = static_cast<char *>( |
| 28 | isBuffOnStack ? malloc(new_size + 1) |
| 29 | : realloc(wb->buff, new_size + 1)); // +1 for null |
| 30 | if (new_buff == nullptr) { |
| 31 | if (wb->buff != wb->init_buff) |
| 32 | free(wb->buff); |
| 33 | return printf_core::ALLOCATION_ERROR; |
| 34 | } |
| 35 | if (isBuffOnStack) |
| 36 | inline_memcpy(new_buff, wb->buff, wb->buff_cur); |
| 37 | wb->buff = new_buff; |
| 38 | inline_memcpy(wb->buff + wb->buff_cur, new_str.data(), new_str.size()); |
| 39 | wb->buff_cur = new_size; |
| 40 | wb->buff_len = new_size; |
| 41 | return printf_core::WRITE_OK; |
| 42 | } |
| 43 | |
| 44 | constexpr size_t DEFAULT_BUFFER_SIZE = 200; |
| 45 | |
| 46 | LIBC_INLINE int vasprintf_internal(char **ret, const char *__restrict format, |
| 47 | internal::ArgList args) { |
| 48 | char init_buff_on_stack[DEFAULT_BUFFER_SIZE]; |
| 49 | printf_core::WriteBuffer<Mode<WriteMode::RESIZE_AND_FILL_BUFF>::value> wb( |
| 50 | init_buff_on_stack, DEFAULT_BUFFER_SIZE, resize_overflow_hook); |
| 51 | printf_core::Writer writer(wb); |
| 52 | |
| 53 | auto ret_val = printf_core::printf_main(&writer, format, args); |
| 54 | if (ret_val < 0) { |
| 55 | *ret = nullptr; |
| 56 | return -1; |
| 57 | } |
| 58 | if (wb.buff == init_buff_on_stack) { |
| 59 | *ret = static_cast<char *>(malloc(ret_val + 1)); |
| 60 | if (ret == nullptr) |
| 61 | return printf_core::ALLOCATION_ERROR; |
| 62 | inline_memcpy(*ret, wb.buff, ret_val); |
| 63 | } else { |
| 64 | *ret = wb.buff; |
| 65 | } |
| 66 | (*ret)[ret_val] = '\0'; |
| 67 | return ret_val; |
| 68 | } |
| 69 | } // namespace printf_core |
| 70 | } // namespace LIBC_NAMESPACE_DECL |
| 71 |
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