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//===-- A class for number to string mappings -------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_SUPPORT_STRING_UTIL_MESSAGE_MAPPER
#define LLVM_LIBC_SRC_SUPPORT_STRING_UTIL_MESSAGE_MAPPER
#include "src/__support/CPP/optional.h"
#include "src/__support/CPP/string_view.h"
#include <stddef.h>
namespace __llvm_libc {
namespace internal {
struct MsgMapping {
int num;
cpp::string_view msg;
constexpr MsgMapping(int init_num, const char *init_msg)
: num(init_num), msg(init_msg) {
;
}
};
constexpr size_t total_str_len(const MsgMapping *array, size_t len) {
size_t total = 0;
for (size_t i = 0; i < len; ++i) {
// add 1 for the null terminator.
total += array[i].msg.size() + 1;
}
return total;
}
template <size_t ARR_SIZE, size_t TOTAL_STR_LEN> class MessageMapper {
int msg_offsets[ARR_SIZE] = {-1};
char string_array[TOTAL_STR_LEN] = {'\0'};
public:
constexpr MessageMapper(const MsgMapping raw_array[], size_t raw_array_len) {
cpp::string_view string_mappings[ARR_SIZE] = {""};
for (size_t i = 0; i < raw_array_len; ++i)
string_mappings[raw_array[i].num] = raw_array[i].msg;
size_t string_array_index = 0;
for (size_t cur_num = 0; cur_num < ARR_SIZE; ++cur_num) {
if (string_mappings[cur_num].size() != 0) {
msg_offsets[cur_num] = string_array_index;
// No need to replace with proper strcpy, this is evaluated at compile
// time.
for (size_t i = 0; i < string_mappings[cur_num].size() + 1;
++i, ++string_array_index) {
string_array[string_array_index] = string_mappings[cur_num][i];
}
} else {
msg_offsets[cur_num] = -1;
}
}
}
cpp::optional<cpp::string_view> get_str(int num) const {
if (num >= 0 && static_cast<size_t>(num) < ARR_SIZE &&
msg_offsets[num] != -1) {
return {string_array + msg_offsets[num]};
} else {
return cpp::optional<cpp::string_view>();
}
}
};
} // namespace internal
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_SUPPORT_STRING_UTIL_MESSAGE_MAPPER
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