71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
// posix_dir.c - chdir, getcwd, opendir, readdir, closedir
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#include <string.h>
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#include <syscall.h>
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#include "posix.h"
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#include "posix_path.h"
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// KDIR_ENTRY layout mirrors io_file.h - duplicated here to avoid
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// pulling kernel headers into posix.dll
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#define KDIR_NAME_MAX 260
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typedef struct {
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char Name[KDIR_NAME_MAX];
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uint8_t Attr;
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uint32_t FileSize;
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} KDIR_ENTRY;
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#define KATTR_DIR 0x10
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__declspec(dllexport) int chdir(const char* path) {
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char native[512];
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PosixTranslatePath(path, native, sizeof(native));
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uint32_t s = SysSetCwd(native);
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if (s != 0) { errno = ENOENT; return -1; }
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return 0;
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}
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__declspec(dllexport) char* getcwd(char* buf, size_t size) {
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if (!buf || size == 0) { errno = EINVAL; return (char*)0; }
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char native[512];
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uint32_t s = SysGetCwd(native, sizeof(native));
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if (s != 0) { errno = ERANGE; return (char*)0; }
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NativeToPosix(native, buf, size);
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return buf;
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}
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__declspec(dllexport) DIR* opendir(const char* path) {
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char native[512];
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PosixTranslatePath(path, native, sizeof(native));
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uint32_t kh;
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uint32_t s = SysOpenDir(native, &kh);
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if (s != 0) { errno = ENOENT; return (DIR*)0; }
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// Allocate DIR on the kernel heap (SysAlloc) so it outlives the stack.
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DIR* d = (DIR*)SysAlloc(sizeof(DIR));
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if (!d) { SysCloseHandle(kh); errno = ENOMEM; return (DIR*)0; }
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d->KHandle = kh;
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d->Valid = false;
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return d;
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}
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__declspec(dllexport) struct dirent* readdir(DIR* d) {
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if (!d) { errno = EBADF; return (struct dirent*)0; }
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KDIR_ENTRY ke;
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uint32_t s = SysReadDir(d->KHandle, &ke);
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if (s != 0) return (struct dirent*)0; // end of directory or error
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size_t len = strlen(ke.Name);
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if (len > NAME_MAX) len = NAME_MAX;
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memcpy(d->Current.d_name, ke.Name, len);
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d->Current.d_name[len] = '\0';
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d->Current.d_type = (ke.Attr & KATTR_DIR) ? DT_DIR : DT_REG;
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d->Valid = true;
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return &d->Current;
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}
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__declspec(dllexport) int closedir(DIR* d) {
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if (!d) { errno = EBADF; return -1; }
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SysCloseHandle(d->KHandle);
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SysFree(d, sizeof(DIR));
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return 0;
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}
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