60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
#include <cstdio>
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#include <string>
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extern "C" FILE *fopen(const char *filename, const char *mode) {
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bool r = false, w = false, a = false, p = false, x = false;
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for (size_t i = 0; mode[i] != '\0'; ++i)
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if (mode[i] == 'r') r = true;
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else if (mode[i] == 'w') w = true;
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else if (mode[i] == 'a') a = true;
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else if (mode[i] == 'p') p = true;
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else if (mode[i] == 'x') x = true;
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euler::syscall::stream_handle handle;
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if (euler::syscall::open_file(filename, !r, x, handle) !=
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euler::syscall::stream_result::success)
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return 0;
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if (w && euler::syscall::set_stream_length(handle, 0) !=
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euler::syscall::stream_result::success)
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return 0;
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if (a && euler::syscall::seek_stream(
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handle, euler::syscall::seek_from::end, 0) !=
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euler::syscall::stream_result::success) {
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euler::syscall::close_stream(handle);
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return 0;
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}
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uint64_t length;
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if (euler::syscall::get_stream_length(handle, length) !=
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euler::syscall::stream_result::success) {
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euler::syscall::close_stream(handle);
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return 0;
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}
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return new euler::file_stream(handle, r || p, length, a ? length : 0);
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}
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extern "C" void fclose(FILE *stream) {
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stream->close();
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delete stream;
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}
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extern "C" int fseek(FILE *stream, long offset, int origin) {
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if (origin < 0 || origin > 2)
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return -1;
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return (int)stream->seek((euler::syscall::seek_from)origin, offset);
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}
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extern "C" size_t fread(
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void *buffer, size_t size, size_t count, FILE *stream) {
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return (stream->read(size * count, buffer).first - 1) / size + 1;
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}
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