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os: change f.write and f.writeln to return options too

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This commit is contained in:
Delyan Angelov 2020-09-12 08:31:15 +03:00
parent 332f3a924c
commit 60ecb7e4b6
2 changed files with 24 additions and 13 deletions
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2
doc/docs.md
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@ -925,7 +925,7 @@ A defer statement defers the execution of a block of statements until the surrou
```v
fn read_log() {
f := os.open('log.txt')
f := os.open('log.txt') or { panic(err) }
defer { f.close() }
...
if !ok {

25
vlib/os/file.v
View File

@ -22,9 +22,9 @@ pub fn (f File) is_opened() bool {
}
// **************************** Write ops ***************************
pub fn (mut f File) write(s string) {
pub fn (mut f File) write(s string) ?int {
if !f.is_opened {
return
return error('file is not opened')
}
/*
$if linux {
@ -34,12 +34,16 @@ pub fn (mut f File) write(s string) {
}
}
*/
C.fwrite(s.str, s.len, 1, f.cfile)
written := C.fwrite(s.str, s.len, 1, f.cfile)
if written == 0 && s.len != 0 {
return error('0 bytes written')
}
return written
}
pub fn (mut f File) writeln(s string) {
pub fn (mut f File) writeln(s string) ?int {
if !f.is_opened {
return
return error('file is not opened')
}
/*
$if linux {
@ -51,8 +55,15 @@ pub fn (mut f File) writeln(s string) {
}
*/
// TODO perf
C.fwrite(s.str, s.len, 1, f.cfile)
C.fputs('\n', f.cfile)
written := C.fwrite(s.str, s.len, 1, f.cfile)
if written == 0 && s.len != 0 {
return error('0 bytes written')
}
x := C.fputs('\n', f.cfile)
if x < 0 {
return error('could not add newline')
}
return (written + 1)
}
pub fn (mut f File) write_bytes(data voidptr, size int) int {