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os: implement File.seek/2 and File.tell/0

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This commit is contained in:
Delyan Angelov
2021-07-22 07:46:21 +03:00
parent 054bd67490
commit d7dcb47db3
4 changed files with 93 additions and 10 deletions
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12
vlib/os/os_c.v
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@ -13,7 +13,7 @@ fn C.readlink(pathname &char, buf &char, bufsiz size_t) int
fn C.getline(voidptr, voidptr, voidptr) int
fn C.ftell(fp voidptr) int
fn C.ftell(fp voidptr) i64
fn C.sigaction(int, voidptr, int) int
@ -83,12 +83,12 @@ pub fn read_bytes(path string) ?[]byte {
return error('ftell failed')
}
C.rewind(fp)
mut res := []byte{len: fsize}
mut res := []byte{len: int(fsize)}
nr_read_elements := int(C.fread(res.data, fsize, 1, fp))
if nr_read_elements == 0 && fsize > 0 {
return error('fread failed')
}
res.trim(nr_read_elements * fsize)
res.trim(nr_read_elements * int(fsize))
return res
}
@ -110,7 +110,7 @@ pub fn read_file(path string) ?string {
// C.fseek(fp, 0, SEEK_SET) // same as `C.rewind(fp)` below
C.rewind(fp)
unsafe {
mut str := malloc_noscan(fsize + 1)
mut str := malloc_noscan(int(fsize) + 1)
nelements := int(C.fread(str, 1, fsize, fp))
is_eof := int(C.feof(fp))
is_error := int(C.ferror(fp))
@ -586,7 +586,7 @@ pub fn read_file_array<T>(path string) []T {
C.rewind(fp)
// read the actual data from the file
len := fsize / tsize
buf := unsafe { malloc_noscan(fsize) }
buf := unsafe { malloc_noscan(int(fsize)) }
nread := C.fread(buf, tsize, len, fp)
C.fclose(fp)
return unsafe {
@ -594,7 +594,7 @@ pub fn read_file_array<T>(path string) []T {
element_size: tsize
data: buf
len: int(nread)
cap: len
cap: int(len)
}
}
}