Drop FileModeToWide allow-listfix_input_file_path

Widen the ASCII fopen mode string with std::wstring's iterator-pair
constructor instead of maintaining a hand-coded mapping. ASCII (0-127)
codepoints are valid wchar_t code units on Windows, which is the only
alphabet fopen modes use.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

1 files changed, 2 insertions, 40 deletions

diff --git a/src/utf8_file.h b/src/utf8_file.h
index 8ef451f..4ee1787 100644
--- a/src/utf8_file.h
+++ b/src/utf8_file.h
@@ -19,7 +19,6 @@
 #pragma once
 
 #include <cstdio>
-#include <cstring>
 #include <stdexcept>
 #include <string>
 
@@ -43,50 +42,13 @@ inline std::wstring Utf8ToWidePath(const std::string& path) {
     res.pop_back();
     return res;
 }
-
-inline const wchar_t* FileModeToWide(const char* mode) {
-    if (!mode) {
-        return nullptr;
-    }
-    if (std::strcmp(mode, "r") == 0) {
-        return L"r";
-    }
-    if (std::strcmp(mode, "w") == 0) {
-        return L"w";
-    }
-    if (std::strcmp(mode, "a") == 0) {
-        return L"a";
-    }
-    if (std::strcmp(mode, "rb") == 0) {
-        return L"rb";
-    }
-    if (std::strcmp(mode, "wb") == 0) {
-        return L"wb";
-    }
-    if (std::strcmp(mode, "ab") == 0) {
-        return L"ab";
-    }
-    if (std::strcmp(mode, "rb+") == 0 || std::strcmp(mode, "r+b") == 0) {
-        return L"rb+";
-    }
-    if (std::strcmp(mode, "wb+") == 0 || std::strcmp(mode, "w+b") == 0) {
-        return L"wb+";
-    }
-    if (std::strcmp(mode, "ab+") == 0 || std::strcmp(mode, "a+b") == 0) {
-        return L"ab+";
-    }
-    return nullptr;
-}
 #endif
 
 inline FILE* FOpenUtf8(const std::string& path, const char* mode) {
 #ifdef _WIN32
-    const wchar_t* wmode = FileModeToWide(mode);
-    if (!wmode) {
-        return nullptr;
-    }
     const std::wstring wpath = Utf8ToWidePath(path);
-    return _wfopen(wpath.c_str(), wmode);
+    const std::wstring wmode(mode, mode + std::char_traits<char>::length(mode));
+    return _wfopen(wpath.c_str(), wmode.c_str());
 #else
     return fopen(path.c_str(), mode);
 #endif