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https://github.com/vlang/v.git
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409 lines
10 KiB
V
409 lines
10 KiB
V
import os
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const tfolder = os.join_path(os.temp_dir(), 'v', 'tests', 'os_file_test')
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const tfile = os.join_path_single(tfolder, 'test_file')
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fn testsuite_begin() ? {
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os.rmdir_all(tfolder) or {}
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assert !os.is_dir(tfolder)
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os.mkdir_all(tfolder)?
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os.chdir(tfolder)?
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assert os.is_dir(tfolder)
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}
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fn testsuite_end() ? {
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os.rmdir_all(tfolder) or {}
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}
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struct Point {
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x f64
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y f64
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z f64
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}
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struct Extended_Point {
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a f64
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b f64
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c f64
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d f64
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e f64
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f f64
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g f64
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h f64
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i f64
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}
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enum Color {
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red
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green
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blue
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}
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[flag]
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enum Permissions {
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read
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write
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execute
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}
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const (
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unit_point = Point{1.0, 1.0, 1.0}
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another_point = Point{0.25, 2.25, 6.25}
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extended_point = Extended_Point{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0}
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another_byte = u8(123)
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another_color = Color.red
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another_permission = Permissions.read | .write
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)
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// test_read_bytes_into_newline_text tests reading text from a file with newlines.
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// This test simulates reading a larger text file step by step into a buffer and
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// returning on each newline, even before the buffer is full, and reaching EOF before
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// the buffer is completely filled.
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fn test_read_bytes_into_newline_text() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write_string('Hello World!\nGood\r morning.')?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut buf := []u8{len: 8}
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n0 := f.read_bytes_into_newline(mut buf)?
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assert n0 == 8
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n1 := f.read_bytes_into_newline(mut buf)?
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assert n1 == 5
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n2 := f.read_bytes_into_newline(mut buf)?
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assert n2 == 8
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n3 := f.read_bytes_into_newline(mut buf)?
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assert n3 == 6
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f.close()
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}
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// test_read_bytes_into_newline_binary tests reading a binary file with NUL bytes.
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// This test simulates the scenario when a byte stream is read and a newline byte
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// appears in that stream and an EOF occurs before the buffer is full.
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fn test_read_bytes_into_newline_binary() ? {
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os.rm(tfile) or {} // FIXME This is a workaround for macos, because the file isn't truncated when open with 'w'
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mut bw := []u8{len: 15}
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bw[9] = 0xff
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bw[12] = 10 // newline
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n0_bytes := bw[0..10]
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n1_bytes := bw[10..13]
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n2_bytes := bw[13..]
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mut f := os.open_file(tfile, 'w')?
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f.write(bw)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut buf := []u8{len: 10}
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n0 := f.read_bytes_into_newline(mut buf)?
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assert n0 == 10
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assert buf[..n0] == n0_bytes
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n1 := f.read_bytes_into_newline(mut buf)?
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assert n1 == 3
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assert buf[..n1] == n1_bytes
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n2 := f.read_bytes_into_newline(mut buf)?
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assert n2 == 2
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assert buf[..n2] == n2_bytes
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f.close()
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}
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// test_read_eof_last_read_partial_buffer_fill tests that when reading a file
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// the end-of-file is detected and results in a none error being returned. This
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// test simulates file reading where the end-of-file is reached inside an fread
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// containing data.
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fn test_read_eof_last_read_partial_buffer_fill() ? {
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mut f := os.open_file(tfile, 'w')?
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bw := []u8{len: 199, init: 5}
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f.write(bw)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut br := []u8{len: 100}
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// Read first 100 bytes of 199 byte file, should fill buffer with no error.
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n0 := f.read(mut br) or { return error('failed to read 100 bytes') }
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assert n0 == 100
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// Read remaining 99 bytes of 199 byte file, should fill buffer with no
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// error, even though end-of-file was reached.
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n1 := f.read(mut br) or { return error('failed to read 100 bytes') }
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assert n1 == 99
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// Read again, end-of-file was previously reached so should return none
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// error.
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if _ := f.read(mut br) {
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// This is not intended behavior because the read function should
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// not return a number of bytes read when end-of-file is reached.
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assert false
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} else {
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// Expected an error when received end-of-file.
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assert err !is none
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}
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f.close()
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}
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// test_read_eof_last_read_full_buffer_fill tests that when reading a file the
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// end-of-file is detected and results in a none error being returned. This test
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// simulates file reading where the end-of-file is reached at the beinning of an
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// fread that returns no data.
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fn test_read_eof_last_read_full_buffer_fill() ? {
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mut f := os.open_file(tfile, 'w')?
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bw := []u8{len: 200, init: 5}
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f.write(bw)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut br := []u8{len: 100}
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// Read first 100 bytes of 200 byte file, should fill buffer with no error.
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n0 := f.read(mut br) or { return error('failed to read 100 bytes') }
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assert n0 == 100
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// Read remaining 100 bytes of 200 byte file, should fill buffer with no
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// error. The end-of-file isn't reached yet, but there is no more data.
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n1 := f.read(mut br) or { return error('failed to read 100 bytes') }
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assert n1 == 100
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// Read again, end-of-file was previously reached so should return none
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// error.
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if _ := f.read(mut br) {
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// This is not intended behavior because the read function should
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// not return a number of bytes read when end-of-file is reached.
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assert false
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} else {
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// Expect an error at EOF.
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assert err !is none
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}
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f.close()
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}
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fn test_write_struct() ? {
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os.rm(tfile) or {} // FIXME This is a workaround for macos, because the file isn't truncated when open with 'w'
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size_of_point := int(sizeof(Point))
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mut f := os.open_file(tfile, 'w')?
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f.write_struct(another_point)?
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f.close()
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x := os.read_file(tfile)?
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pcopy := unsafe { &u8(memdup(&another_point, size_of_point)) }
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y := unsafe { pcopy.vstring_with_len(size_of_point) }
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assert x == y
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$if debug {
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eprintln(x.bytes())
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eprintln(y.bytes())
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}
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}
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fn test_write_struct_at() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write_struct(extended_point)?
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f.write_struct_at(another_point, 3)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut p := Point{}
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f.read_struct_at(mut p, 3)?
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f.close()
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assert p == another_point
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}
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fn test_read_struct() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write_struct(another_point)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut p := Point{}
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f.read_struct(mut p)?
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f.close()
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assert p == another_point
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}
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fn test_read_struct_at() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write([u8(1), 2, 3])?
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f.write_struct(another_point)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut p := Point{}
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f.read_struct_at(mut p, 3)?
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f.close()
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assert p == another_point
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}
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fn test_write_raw() ? {
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os.rm(tfile) or {} // FIXME This is a workaround for macos, because the file isn't truncated when open with 'w'
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size_of_point := int(sizeof(Point))
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mut f := os.open_file(tfile, 'w')?
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f.write_raw(another_point)?
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f.close()
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x := os.read_file(tfile)?
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pcopy := unsafe { &u8(memdup(&another_point, size_of_point)) }
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y := unsafe { pcopy.vstring_with_len(size_of_point) }
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assert x == y
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$if debug {
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eprintln(x.bytes())
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eprintln(y.bytes())
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}
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}
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fn test_write_raw_at() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write_raw(extended_point)?
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f.write_raw_at(another_point, 3)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut p := Point{}
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f.read_struct_at(mut p, 3)?
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f.close()
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assert p == another_point
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}
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fn test_write_raw_at_negative_pos() ? {
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mut f := os.open_file(tfile, 'w')?
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if _ := f.write_raw_at(another_point, -1) {
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assert false
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}
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f.write_raw_at(another_point, -234) or { assert err.msg() == 'Invalid argument' }
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f.close()
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}
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fn test_read_raw() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write_raw(another_point)?
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f.write_raw(another_byte)?
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f.write_raw(another_color)?
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f.write_raw(another_permission)?
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f.close()
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f = os.open_file(tfile, 'r')?
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p := f.read_raw<Point>()?
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b := f.read_raw<u8>()?
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c := f.read_raw<Color>()?
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x := f.read_raw<Permissions>()?
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f.close()
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assert p == another_point
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assert b == another_byte
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assert c == another_color
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assert x == another_permission
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}
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fn test_read_raw_at() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write([u8(1), 2, 3])?
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f.write_raw(another_point)?
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f.write_raw(another_byte)?
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f.write_raw(another_color)?
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f.write_raw(another_permission)?
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f.close()
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f = os.open_file(tfile, 'r')?
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mut at := u64(3)
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p := f.read_raw_at<Point>(at)?
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at += sizeof(Point)
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b := f.read_raw_at<u8>(at)?
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at += sizeof(u8)
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c := f.read_raw_at<Color>(at)?
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at += sizeof(Color)
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x := f.read_raw_at<Permissions>(at)?
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at += sizeof(Permissions)
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f.close()
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assert p == another_point
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assert b == another_byte
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assert c == another_color
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assert x == another_permission
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}
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fn test_read_raw_at_negative_pos() ? {
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mut f := os.open_file(tfile, 'r')?
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if _ := f.read_raw_at<Point>(-1) {
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assert false
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}
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f.read_raw_at<Point>(-234) or { assert err.msg() == 'Invalid argument' }
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f.close()
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}
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fn test_seek() ? {
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mut f := os.open_file(tfile, 'w')?
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f.write_raw(another_point)?
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f.write_raw(another_byte)?
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f.write_raw(another_color)?
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f.write_raw(another_permission)?
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f.close()
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// println('> ${sizeof(Point)} ${sizeof(byte)} ${sizeof(Color)} ${sizeof(Permissions)}')
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f = os.open_file(tfile, 'r')?
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//
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f.seek(i64(sizeof(Point)), .start)?
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assert f.tell()? == sizeof(Point)
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b := f.read_raw<u8>()?
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assert b == another_byte
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f.seek(i64(sizeof(Color)), .current)?
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x := f.read_raw<Permissions>()?
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assert x == another_permission
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//
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f.close()
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}
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fn test_tell() ? {
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for size in 10 .. 30 {
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s := 'x'.repeat(size)
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os.write_file(tfile, s)?
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fs := os.file_size(tfile)
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assert int(fs) == size
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//
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mut f := os.open_file(tfile, 'r')?
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f.seek(-5, .end)?
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pos := f.tell()?
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f.close()
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// dump(pos)
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assert pos == size - 5
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}
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}
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fn test_reopen() ? {
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tfile1 := os.join_path_single(tfolder, 'tfile1')
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tfile2 := os.join_path_single(tfolder, 'tfile2')
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os.write_file(tfile1, 'Hello World!\nGood\r morning.\nBye 1.')?
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os.write_file(tfile2, 'Another file\nAnother line.\nBye 2.')?
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assert os.file_size(tfile1) > 0
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assert os.file_size(tfile2) > 0
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mut line_buffer := []u8{len: 1024}
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mut f2 := os.open(tfile2)?
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x := f2.read_bytes_into_newline(mut line_buffer)?
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assert !f2.eof()
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assert x > 0
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assert line_buffer#[..x].bytestr() == 'Another file\n'
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// Note: after this call, f2 should be using the file `tfile1`:
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f2.reopen(tfile1, 'r')?
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assert !f2.eof()
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z := f2.read(mut line_buffer)?
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assert f2.eof()
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assert z > 0
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content := line_buffer#[..z].bytestr()
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// dump(content)
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assert content.starts_with('Hello World')
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assert content.ends_with('Bye 1.')
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}
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fn test_eof() ? {
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os.write_file(tfile, 'Hello World!\n')?
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mut f := os.open(tfile)?
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f.read_bytes(10)
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assert !f.eof()
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f.read_bytes(100)
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assert f.eof()
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}
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