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Codechange: Use std::string_view in FormatString, and validate string bounds while parsing.

pull/13862/head
frosch 2025-03-21 14:02:33 +01:00
parent c105adcd96
commit 10e4212e69
6 changed files with 321 additions and 105 deletions
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34
src/newgrf_text.cpp
View File

@ -23,6 +23,7 @@
#include "newgrf_storage.h"
#include "newgrf_text.h"
#include "newgrf_cargo.h"
#include "string_base.h"
#include "string_func.h"
#include "timer/timer_game_calendar.h"
#include "debug.h"
@ -767,7 +768,7 @@ static void HandleNewGRFStringControlCodes(std::string_view str, TextRefStack &s
* @param stack The TextRefStack.
* @param[out] params Output parameters
*/
static void ProcessNewGRFStringControlCode(char32_t scc, const char *&str, TextRefStack &stack, std::vector<StringParameter> &params)
static void ProcessNewGRFStringControlCode(char32_t scc, StringConsumer &str, TextRefStack &stack, std::vector<StringParameter> &params)
{
/* There is data on the NewGRF text stack, and we want to move them to OpenTTD's string stack.
* After this call, a new call is made with `modify_parameters` set to false when the string is finally formatted. */
@ -775,15 +776,15 @@ static void ProcessNewGRFStringControlCode(char32_t scc, const char *&str, TextR
default: return;
case SCC_PLURAL_LIST:
++str; // plural form
(void)str.Uint8Consume(); // plural form
[[fallthrough]];
case SCC_GENDER_LIST: {
++str; // offset
(void)str.Uint8Consume(); // offset
/* plural and gender choices cannot contain any string commands, so just skip the whole thing */
uint num = static_cast<uint8_t>(*str++);
uint num = str.Uint8Consume();
uint total_len = 0;
for (uint i = 0; i != num; i++) {
total_len += static_cast<uint8_t>(*str++);
total_len += str.Uint8Consume();
}
str += total_len;
break;
@ -791,17 +792,18 @@ static void ProcessNewGRFStringControlCode(char32_t scc, const char *&str, TextR
case SCC_SWITCH_CASE: {
/* skip all cases and continue with default case */
uint num = static_cast<uint8_t>(*str++);
uint num = str.Uint8Consume();
for (uint i = 0; i != num; i++) {
str += 3 + static_cast<uint8_t>(str[1]) + (static_cast<uint8_t>(str[2]) << 8);
(void)str.Uint8Consume(); // case index
str += str.Uint16LEConsume();
}
str += 2; // length of default
(void)str.Uint16LEConsume(); // default case length
break;
}
case SCC_GENDER_INDEX:
case SCC_SET_CASE:
++str;
(void)str.Uint8Consume();
break;
case SCC_ARG_INDEX:
@ -841,7 +843,7 @@ static void ProcessNewGRFStringControlCode(char32_t scc, const char *&str, TextR
case SCC_NEWGRF_DISCARD_WORD: stack.PopUnsignedWord(); break;
case SCC_NEWGRF_ROTATE_TOP_4_WORDS: stack.RotateTop4Words(); break;
case SCC_NEWGRF_PUSH_WORD: stack.PushWord(Utf8Consume(&str)); break;
case SCC_NEWGRF_PUSH_WORD: stack.PushWord(str.Utf8Consume()); break;
case SCC_NEWGRF_PRINT_WORD_CARGO_LONG:
case SCC_NEWGRF_PRINT_WORD_CARGO_SHORT:
@ -851,7 +853,7 @@ static void ProcessNewGRFStringControlCode(char32_t scc, const char *&str, TextR
break;
case SCC_NEWGRF_STRINL: {
StringID stringid = Utf8Consume(str);
StringID stringid = str.Utf8Consume();
/* We also need to handle the substring's stack usage. */
HandleNewGRFStringControlCodes(GetStringPtr(stringid), stack, params);
break;
@ -879,7 +881,7 @@ static void ProcessNewGRFStringControlCode(char32_t scc, const char *&str, TextR
* @param[in,out] str String iterator, moved forward if SCC_NEWGRF_PUSH_WORD is found.
* @returns String code to use.
*/
char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str)
char32_t RemapNewGRFStringControlCode(char32_t scc, StringConsumer &str)
{
switch (scc) {
default:
@ -947,7 +949,7 @@ char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str)
/* These NewGRF string codes modify the NewGRF stack or otherwise do not map to OpenTTD string codes. */
case SCC_NEWGRF_PUSH_WORD:
Utf8Consume(str);
(void)str.Utf8Consume();
return 0;
case SCC_NEWGRF_DISCARD_WORD:
@ -964,9 +966,9 @@ char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str)
*/
static void HandleNewGRFStringControlCodes(std::string_view str, TextRefStack &stack, std::vector<StringParameter> &params)
{
for (const char *p = str.data(), *end = str.data() + str.size(); p < end; /* nothing */) {
char32_t scc;
p += Utf8Decode(&scc, p);
StringConsumer p(str);
while (!p.empty()) {
char32_t scc = p.Utf8Consume();
ProcessNewGRFStringControlCode(scc, p, stack, params);
}
}

52
src/string.cpp
View File

@ -18,6 +18,7 @@
#include <sstream>
#include <iomanip>
#include <charconv>
#ifdef _MSC_VER
# define strncasecmp strnicmp
@ -448,28 +449,29 @@ bool IsValidChar(char32_t key, CharSetFilter afilter)
* @param s Character stream to retrieve character from.
* @return Number of characters in the sequence.
*/
size_t Utf8Decode(char32_t *c, const char *s)
size_t Utf8Decode(char32_t *c, const char *s, size_t maxlen)
{
assert(c != nullptr);
assert(maxlen > 0);
if (!HasBit(s[0], 7)) {
/* Single byte character: 0xxxxxxx */
*c = s[0];
return 1;
} else if (GB(s[0], 5, 3) == 6) {
if (IsUtf8Part(s[1])) {
if (maxlen >= 2 && IsUtf8Part(s[1])) {
/* Double byte character: 110xxxxx 10xxxxxx */
*c = GB(s[0], 0, 5) << 6 | GB(s[1], 0, 6);
if (*c >= 0x80) return 2;
}
} else if (GB(s[0], 4, 4) == 14) {
if (IsUtf8Part(s[1]) && IsUtf8Part(s[2])) {
if (maxlen >= 3 && IsUtf8Part(s[1]) && IsUtf8Part(s[2])) {
/* Triple byte character: 1110xxxx 10xxxxxx 10xxxxxx */
*c = GB(s[0], 0, 4) << 12 | GB(s[1], 0, 6) << 6 | GB(s[2], 0, 6);
if (*c >= 0x800) return 3;
}
} else if (GB(s[0], 3, 5) == 30) {
if (IsUtf8Part(s[1]) && IsUtf8Part(s[2]) && IsUtf8Part(s[3])) {
if (maxlen >= 4 && IsUtf8Part(s[1]) && IsUtf8Part(s[2]) && IsUtf8Part(s[3])) {
/* 4 byte character: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
*c = GB(s[0], 0, 3) << 18 | GB(s[1], 0, 6) << 12 | GB(s[2], 0, 6) << 6 | GB(s[3], 0, 6);
if (*c >= 0x10000 && *c <= 0x10FFFF) return 4;
@ -1072,3 +1074,45 @@ public:
#endif /* defined(WITH_COCOA) && !defined(STRGEN) && !defined(SETTINGSGEN) */
#endif
/**
* Consume and return a UTF-8 character.
*/
char32_t StringConsumer::Utf8Consume()
{
if (this->empty()) {
assert(false);
return '?';
}
char32_t res;
size_t len = Utf8Decode(&res, this->data(), this->size());
*this += len;
return res;
}
template<class T>
static T ParseInt(std::string_view& str, int base)
{
T res;
const char *begin = str.data();
const char *end = begin + str.size();
const char *next = std::from_chars(begin, end, res, base).ptr;
assert(begin <= next && next <= end);
str.remove_prefix(next - begin);
return next == begin ? 0 : res;
}
/**
* Parse string to integer, and consume the involved characters.
* @param base Number base.
* @return parsed value
*/
uint32_t StringConsumer::Uint32Parse(int base)
{
return ParseInt<uint32_t>(this->string, base);
}
uint64_t StringConsumer::Uint64Parse(int base)
{
return ParseInt<uint64_t>(this->string, base);
}

176
src/string_base.h
View File

@ -61,4 +61,180 @@ protected:
StringIterator() {}
};
/**
* Input iterator from std::string_view.
*/
class StringConsumer {
std::string_view string;
public:
using size_type = std::string_view::size_type;
/**
* Create a consumer for an external string.
*/
explicit StringConsumer(std::string_view string) : string(string) {}
/**
* Check whether no bytes are left.
* @return true if empty.
*/
[[nodiscard]] bool empty() const noexcept { return this->string.empty(); }
/**
* Get number of bytes left.
* @return Number of bytes left.
*/
[[nodiscard]] size_type size() const noexcept { return this->string.size(); }
/**
* Advance by one byte.
* @return this
*/
StringConsumer &operator++()
{
*this += 1;
return *this;
}
/**
* Advance by one byte.
* @return Copy of this before advancing.
*/
StringConsumer operator++(int)
{
auto res = *this;
*this += 1;
return res;
}
/**
* Advance by "count" byte.
* @param count Number of bytes to skip.
* @return this
*/
StringConsumer &operator+=(size_type count)
{
if (count <= this->string.size()) {
this->string.remove_prefix(count);
} else {
assert(false);
this->string.remove_prefix(this->string.size());
}
return *this;
}
/**
* Peek first byte.
* @return First byte.
*/
[[nodiscard]] char operator*() const
{
if (this->string.empty()) {
assert(false);
return '?';
} else {
return this->string.front();
}
}
/**
* Get buffer of all remaining bytes.
* @return Buffer start.
*/
[[nodiscard]] const char *data() const { return this->string.data(); }
/**
* Get view of all remaining bytes.
* @return Remaining bytes.
*/
[[nodiscard]] std::string_view str() const noexcept { return this->string; }
/**
* Find position of first occurrence of some byte.
* @param c Byte to search for.
* @return Offset to first occurrence, or "npos" if no occurrence.
*/
[[nodiscard]] size_type find(char c) const { return this->string.find(c); }
/**
* Special value for "find" and "StrConsume".
*/
static constexpr size_type npos = std::string_view::npos;
/**
* Read a UTF-8 character and advance the consumer.
* @return Read character.
*/
[[nodiscard]] char32_t Utf8Consume();
/**
* Read a uint8_t and advance the consumer.
* @return Read integer.
*/
[[nodiscard]] uint8_t Uint8Consume()
{
if (this->string.empty()) {
assert(false);
return 0;
} else {
uint8_t res = **this;
*this += 1;
return res;
}
}
/**
* Read a uint16_t in little endian and advance the consumer.
* @return Read integer.
*/
[[nodiscard]] uint16_t Uint16LEConsume()
{
uint16_t res = this->Uint8Consume();
res |= this->Uint8Consume() << 8;
return res;
}
/**
* Read a sequence of bytes and advance the consumer.
* @param len Number of bytes to read.
* @return Read string.
*/
[[nodiscard]] std::string_view StrConsume(size_type len)
{
if (len != npos && len > this->string.size()) {
assert(false);
len = npos;
}
if (len == npos) {
std::string_view res = this->string;
this->string.remove_prefix(this->string.size());
return res;
} else {
std::string_view res = this->string.substr(0, len);
this->string.remove_prefix(len);
return res;
}
}
/**
* Read and parse a uint32_t and advance the consumer.
* @param base Number base.
* @return Parsed integer.
*/
[[nodiscard]] uint32_t Uint32Parse(int base);
/**
* Read and parse a uint64_t and advance the consumer.
* @param base Number base.
* @return Parsed integer.
*/
[[nodiscard]] uint64_t Uint64Parse(int base);
/**
* Discard all remaining bytes.
*/
void clear() { this->string.remove_prefix(this->string.size()); }
};
#endif /* STRING_BASE_H */

2
src/string_func.h
View File

@ -76,7 +76,7 @@ inline size_t ttd_strnlen(const char *str, size_t maxlen)
bool IsValidChar(char32_t key, CharSetFilter afilter);
size_t Utf8Decode(char32_t *c, const char *s);
size_t Utf8Decode(char32_t *c, const char *s, size_t maxlen = 4);
/* std::string_view::iterator might be char *, in which case we do not want this templated variant to be taken. */
template <typename T> requires (!std::is_same_v<T, char *> && (std::is_same_v<std::string_view::iterator, T> || std::is_same_v<std::string::iterator, T>))
inline size_t Utf8Decode(char32_t *c, T &s) { return Utf8Decode(c, &*s); }

160
src/strings.cpp
View File

@ -28,6 +28,7 @@
#include "engine_base.h"
#include "language.h"
#include "townname_func.h"
#include "string_base.h"
#include "string_func.h"
#include "company_base.h"
#include "smallmap_gui.h"
@ -776,22 +777,25 @@ static int DeterminePluralForm(int64_t count, int plural_form)
}
}
static const char *ParseStringChoice(const char *b, uint form, StringBuilder &builder)
static void ParseStringChoice(StringConsumer& str, uint form, StringBuilder &builder)
{
/* <NUM> {Length of each string} {each string} */
uint n = (uint8_t)*b++;
size_t form_offset = 0, form_len = 0, total_len = 0;
uint n = str.Uint8Consume();
size_t form_pre = 0, form_len = 0, form_post = 0;
for (uint i = 0; i != n; i++) {
uint len = (uint8_t)*b++;
if (i == form) {
form_offset = total_len;
uint len = str.Uint8Consume();
if (i < form) {
form_pre += len;
} else if (i > form) {
form_post += len;
} else {
form_len = len;
}
total_len += len;
}
builder += std::string_view(b + form_offset, form_len);
return b + total_len;
str += form_pre;
builder += str.StrConsume(form_len);
str += form_post;
}
/** Helper for unit conversion. */
@ -998,62 +1002,59 @@ uint ConvertDisplaySpeedToKmhishSpeed(uint speed, VehicleType type)
* @param builder The string builder to write the string to.
* @returns Updated position position in input buffer.
*/
static const char *DecodeEncodedString(const char *str, bool game_script, StringBuilder &builder)
static void DecodeEncodedString(StringConsumer &str, bool game_script, StringBuilder &builder)
{
std::vector<StringParameter> sub_args;
char *p;
StringIndexInTab id(std::strtoul(str, &p, 16));
if (*p != SCC_RECORD_SEPARATOR && *p != '\0') {
while (*p != '\0') p++;
StringIndexInTab id(str.Uint32Parse(16));
if (!str.empty() && *str != SCC_RECORD_SEPARATOR) {
str.clear();
builder += "(invalid SCC_ENCODED)";
return p;
return;
}
if (game_script && id >= TAB_SIZE_GAMESCRIPT) {
while (*p != '\0') p++;
str.clear();
builder += "(invalid StringID)";
return p;
return;
}
while (*p != '\0') {
while (!str.empty()) {
/* The start of parameter. */
const char *s = ++p;
++str;
/* Find end of the parameter. */
for (; *p != '\0' && *p != SCC_RECORD_SEPARATOR; ++p) {}
if (s == p) {
StringConsumer record{str.StrConsume(str.find(SCC_RECORD_SEPARATOR))};
if (record.empty()) {
/* This is an empty parameter. */
sub_args.emplace_back(std::monostate{});
continue;
}
/* Get the parameter type. */
char32_t parameter_type;
size_t len = Utf8Decode(&parameter_type, s);
s += len;
char32_t parameter_type = record.Utf8Consume();
switch (parameter_type) {
case SCC_ENCODED: {
uint64_t param = std::strtoull(s, &p, 16);
uint64_t param = record.Uint64Parse(16);
if (param >= TAB_SIZE_GAMESCRIPT) {
while (*p != '\0') p++;
str.clear();
builder += "(invalid sub-StringID)";
return p;
return;
}
assert(record.empty());
param = MakeStringID(TEXT_TAB_GAMESCRIPT_START, StringIndexInTab(param));
sub_args.emplace_back(param);
break;
}
case SCC_ENCODED_NUMERIC: {
uint64_t param = std::strtoull(s, &p, 16);
uint64_t param = record.Uint64Parse(16);
assert(record.empty());
sub_args.emplace_back(param);
break;
}
case SCC_ENCODED_STRING: {
sub_args.emplace_back(std::string(s, p - s));
sub_args.push_back(std::string(record.str()));
break;
}
@ -1066,8 +1067,6 @@ static const char *DecodeEncodedString(const char *str, bool game_script, String
StringID stringid = game_script ? MakeStringID(TEXT_TAB_GAMESCRIPT_START, id) : StringID{id.base()};
GetStringWithArgs(builder, stringid, sub_args, true);
return p;
}
/**
@ -1098,33 +1097,28 @@ static void FormatString(StringBuilder &builder, std::string_view str_arg, Strin
}
uint next_substr_case_index = 0;
struct StrStackItem {
const char *str;
const char *end;
StringConsumer str;
size_t first_param_offset;
uint case_index;
StrStackItem(std::string_view view, size_t first_param_offset, uint case_index)
: str(view.data()), end(view.data() + view.size()), first_param_offset(first_param_offset), case_index(case_index)
{}
};
std::stack<StrStackItem, std::vector<StrStackItem>> str_stack;
str_stack.emplace(str_arg, orig_first_param_offset, orig_case_index);
str_stack.emplace(StringConsumer(str_arg), orig_first_param_offset, orig_case_index);
for (;;) {
try {
while (!str_stack.empty() && str_stack.top().str >= str_stack.top().end) {
while (!str_stack.empty() && str_stack.top().str.empty()) {
str_stack.pop();
}
if (str_stack.empty()) break;
const char *&str = str_stack.top().str;
StringConsumer &str = str_stack.top().str;
const size_t ref_param_offset = str_stack.top().first_param_offset;
const uint case_index = str_stack.top().case_index;
char32_t b = Utf8Consume(&str);
char32_t b = str.Utf8Consume();
assert(b != 0);
if (SCC_NEWGRF_FIRST <= b && b <= SCC_NEWGRF_LAST) {
/* We need to pass some stuff as it might be modified. */
b = RemapNewGRFStringControlCode(b, &str);
b = RemapNewGRFStringControlCode(b, str);
if (b == 0) continue;
}
@ -1137,13 +1131,13 @@ static void FormatString(StringBuilder &builder, std::string_view str_arg, Strin
switch (b) {
case SCC_ENCODED:
case SCC_ENCODED_INTERNAL:
str = DecodeEncodedString(str, b == SCC_ENCODED, builder);
DecodeEncodedString(str, b == SCC_ENCODED, builder);
break;
case SCC_NEWGRF_STRINL: {
StringID substr = Utf8Consume(&str);
StringID substr = str.Utf8Consume();
std::string_view ptr = GetStringPtr(substr);
str_stack.emplace(ptr, args.GetOffset(), next_substr_case_index); // this may invalidate "str"
str_stack.emplace(StringConsumer(ptr), args.GetOffset(), next_substr_case_index); // this may invalidate "str"
next_substr_case_index = 0;
break;
}
@ -1151,14 +1145,14 @@ static void FormatString(StringBuilder &builder, std::string_view str_arg, Strin
case SCC_NEWGRF_PRINT_WORD_STRING_ID: {
StringID substr = args.GetNextParameter<StringID>();
std::string_view ptr = GetStringPtr(substr);
str_stack.emplace(ptr, args.GetOffset(), next_substr_case_index); // this may invalidate "str"
str_stack.emplace(StringConsumer(ptr), args.GetOffset(), next_substr_case_index); // this may invalidate "str"
next_substr_case_index = 0;
break;
}
case SCC_GENDER_LIST: { // {G 0 Der Die Das}
/* First read the meta data from the language file. */
size_t offset = ref_param_offset + (uint8_t)*str++;
size_t offset = ref_param_offset + str.Uint8Consume();
int gender = 0;
if (offset >= args.GetNumParameters()) {
/* The offset may come from an external NewGRF, and be invalid. */
@ -1167,50 +1161,54 @@ static void FormatString(StringBuilder &builder, std::string_view str_arg, Strin
/* Now we need to figure out what text to resolve, i.e.
* what do we need to draw? So get the actual raw string
* first using the control code to get said string. */
char input[4 + 1];
char *p = input + Utf8Encode(input, args.GetTypeAtOffset(offset));
*p = '\0';
std::string input;
{
StringBuilder tmp_builder(input);
tmp_builder.Utf8Encode(args.GetTypeAtOffset(offset));
}
/* The gender is stored at the start of the formatted string. */
bool old_sgd = _scan_for_gender_data;
_scan_for_gender_data = true;
std::string buffer;
StringBuilder tmp_builder(buffer);
StringParameters tmp_params = args.GetRemainingParameters(offset);
FormatString(tmp_builder, input, tmp_params);
_scan_for_gender_data = old_sgd;
{
bool old_sgd = _scan_for_gender_data;
_scan_for_gender_data = true;
StringBuilder tmp_builder(buffer);
StringParameters tmp_params = args.GetRemainingParameters(offset);
FormatString(tmp_builder, input, tmp_params);
_scan_for_gender_data = old_sgd;
}
/* And determine the string. */
const char *s = buffer.c_str();
char32_t c = Utf8Consume(&s);
StringConsumer tmp_consumer(buffer);
char32_t c = tmp_consumer.Utf8Consume();
/* Does this string have a gender, if so, set it */
if (c == SCC_GENDER_INDEX) gender = (uint8_t)s[0];
if (c == SCC_GENDER_INDEX) gender = tmp_consumer.Uint8Consume();
}
str = ParseStringChoice(str, gender, builder);
ParseStringChoice(str, gender, builder);
break;
}
/* This sets up the gender for the string.
* We just ignore this one. It's used in {G 0 Der Die Das} to determine the case. */
case SCC_GENDER_INDEX: // {GENDER 0}
case SCC_GENDER_INDEX: { // {GENDER 0}
uint8_t gender = str.Uint8Consume();
if (_scan_for_gender_data) {
builder.Utf8Encode(SCC_GENDER_INDEX);
builder += *str++;
} else {
str++;
builder += gender;
}
break;
}
case SCC_PLURAL_LIST: { // {P}
int plural_form = *str++; // contains the plural form for this string
size_t offset = ref_param_offset + (uint8_t)*str++;
int plural_form = str.Uint8Consume(); // contains the plural form for this string
size_t offset = ref_param_offset + str.Uint8Consume();
const uint64_t *v = nullptr;
/* The offset may come from an external NewGRF, and be invalid. */
if (offset < args.GetNumParameters()) {
v = std::get_if<uint64_t>(&args.GetParam(offset)); // contains the number that determines plural
}
if (v != nullptr) {
str = ParseStringChoice(str, DeterminePluralForm(static_cast<int64_t>(*v), plural_form), builder);
ParseStringChoice(str, DeterminePluralForm(static_cast<int64_t>(*v), plural_form), builder);
} else {
builder += "(invalid PLURAL parameter)";
}
@ -1218,38 +1216,34 @@ static void FormatString(StringBuilder &builder, std::string_view str_arg, Strin
}
case SCC_ARG_INDEX: { // Move argument pointer
args.SetOffset(ref_param_offset + (uint8_t)*str++);
args.SetOffset(ref_param_offset + str.Uint8Consume());
break;
}
case SCC_SET_CASE: { // {SET_CASE}
/* This is a pseudo command, it's outputted when someone does {STRING.ack}
* The modifier is added to all subsequent GetStringWithArgs that accept the modifier. */
next_substr_case_index = (uint8_t)*str++;
next_substr_case_index = str.Uint8Consume();
break;
}
case SCC_SWITCH_CASE: { // {Used to implement case switching}
/* <0x9E> <NUM CASES> <CASE1> <LEN1> <STRING1> <CASE2> <LEN2> <STRING2> <CASE3> <LEN3> <STRING3> <LENDEFAULT> <STRINGDEFAULT>
* Each LEN is printed using 2 bytes in little endian order. */
uint num = (uint8_t)*str++;
uint num = str.Uint8Consume();
std::optional<std::string_view> found;
for (; num > 0; --num) {
uint8_t index = static_cast<uint8_t>(str[0]);
uint16_t len = static_cast<uint8_t>(str[1]) + (static_cast<uint8_t>(str[2]) << 8);
str += 3;
uint8_t index = str.Uint8Consume();
uint16_t len = str.Uint16LEConsume();
std::string_view case_data = str.StrConsume(len);
if (index == case_index) {
/* Found the case */
found.emplace(str, len);
found = case_data;
}
str += len;
}
uint16_t default_len = static_cast<uint8_t>(str[0]) + (static_cast<uint8_t>(str[1]) << 8);
str += 2;
if (!found.has_value()) found.emplace(str, default_len);
str += default_len;
assert(str <= str_stack.top().end);
str_stack.emplace(*found, ref_param_offset, case_index); // this may invalidate "str"
uint16_t default_len = str.Uint16LEConsume();
std::string_view default_data = str.StrConsume(default_len);
str_stack.emplace(StringConsumer(found.value_or(default_data)), ref_param_offset, case_index); // this may invalidate "str"
break;
}

2
src/strings_internal.h
View File

@ -311,6 +311,6 @@ void GenerateTownNameString(StringBuilder &builder, size_t lang, uint32_t seed);
void GetTownName(StringBuilder &builder, const struct Town *t);
void GRFTownNameGenerate(StringBuilder &builder, uint32_t grfid, uint16_t gen, uint32_t seed);
char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str);
char32_t RemapNewGRFStringControlCode(char32_t scc, class StringConsumer &str);
#endif /* STRINGS_INTERNAL_H */