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Actual fopen implementation

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At long last, an actual function I'm supposed to implement.
This commit is contained in:
Stephen Miller 2026-02-09 21:50:29 -06:00
parent 0a2d864884
commit dc7969b418
2 changed files with 20 additions and 3 deletions
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1
src/core/libraries/kernel/file_system.h
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@ -65,6 +65,7 @@ constexpr int ORBIS_KERNEL_O_DSYNC = 0x1000;
constexpr int ORBIS_KERNEL_O_DIRECT = 0x00010000;
constexpr int ORBIS_KERNEL_O_DIRECTORY = 0x00020000;
s32 PS4_SYSV_ABI posix_open(const char* path, s32 flags, u16 mode);
s64 PS4_SYSV_ABI sceKernelWrite(s32 fd, const void* buf, u64 nbytes);
s64 PS4_SYSV_ABI sceKernelRead(s32 fd, void* buf, u64 nbytes);
s64 PS4_SYSV_ABI sceKernelPread(s32 fd, void* buf, u64 nbytes, s64 offset);

22
src/core/libraries/libc_internal/libc_internal_io.cpp
View File

@ -175,12 +175,27 @@ OrbisFILE* PS4_SYSV_ABI internal__Foprep(const char* path, const char* mode, Orb
return file;
}
s32 PS4_SYSV_ABI internal__Fopen(const char* path, u16 mode, bool flag) {}
s32 PS4_SYSV_ABI internal__Fopen(const char* path, u16 mode, bool flag) {
u32 large_mode = mode;
u16 open_mode = 0600;
if (!flag) {
open_mode = 0666;
}
// Straight from decomp, should probably get cleaned up at some point.
s32 creat_flag = large_mode << 5 & 0x200;
s32 excl_flag = large_mode << 5 & 0x800;
s32 misc_flags = (large_mode & 8) * 0x80 + (large_mode & 4) * 2;
// Real library has an array for this, where large_mode & 3 is used as an index.
// That array has values [0, 0, 1, 2], so this call should match the result.
s32 access_flag = std::max<s32>((large_mode & 3) - 1, 0);
s32 open_flags = creat_flag | misc_flags | excl_flag | access_flag;
return Libraries::Kernel::posix_open(path, open_flags, open_mode);
}
OrbisFILE* PS4_SYSV_ABI internal_fopen(const char* path, const char* mode) {
std::scoped_lock lk{g_stream_mtx};
return nullptr;
OrbisFILE* file = internal__Fofind();
return internal__Foprep(path, mode, file, -1, 0, 0);
}
s32 PS4_SYSV_ABI internal_fseek(OrbisFILE* stream, s64 offset, s32 whence) {
@ -199,6 +214,7 @@ void RegisterlibSceLibcInternalIo(Core::Loader::SymbolsResolver* sym) {
LIB_FUNCTION("eLdDw6l0-bU", "libSceLibcInternal", 1, "libSceLibcInternal", internal_snprintf);
LIB_FUNCTION("xGT4Mc55ViQ", "libSceLibcInternal", 1, "libSceLibcInternal", internal__Fofind);
LIB_FUNCTION("dREVnZkAKRE", "libSceLibcInternal", 1, "libSceLibcInternal", internal__Foprep);
LIB_FUNCTION("sQL8D-jio7U", "libSceLibcInternal", 1, "libSceLibcInternal", internal__Fopen);
LIB_FUNCTION("vZkmJmvqueY", "libSceLibcInternal", 1, "libSceLibcInternal",
internal__Lockfilelock);
LIB_FUNCTION("0x7rx8TKy2Y", "libSceLibcInternal", 1, "libSceLibcInternal",