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use std
use bio
const main = {
var f
/* Must be bigger than a bio buffer (ie, > 64k) */
var buf : byte[64*1024]
match bio.open("data/datafile", bio.Rd)
| `std.Ok bio: f = bio
| `std.Err m: std.fatal("Unable to open data file: {}\n", m)
;;
std.assert(peekb(f) == 0x30, "wrong byte value read from datafile\n")
std.assert(peekc(f) == '0', "wrong char value read from datafile\n")
bio.read(f, buf[:4]) /* skip ahead 4 bytes */
std.assert(peekb(f) == 0x34, "wrong byte value read from datafile\n")
std.assert(peekc(f) == '4', "wrong char value read from datafile\n")
bio.read(f, buf[:]) /* skip ahead 64k */
std.assert(peekb(f) == 0x30, "wrong byte value read from datafile\n")
std.assert(peekc(f) == '0', "wrong char value read from datafile\n")
bio.close(f);
std.put("Succeded peeeking values\n")
}
const peekc = {f
match bio.peekc(f)
| `bio.Ok c: -> c
| `bio.Eof:
std.put("eof\n")
-> -1
| `bio.Err e:
std.fatal("error reading\n")
-> -1
;;
}
const peekb = {f
match bio.peekb(f)
| `bio.Ok b: -> b
| `bio.Eof:
std.put("eof\n")
-> -1
| `bio.Err e:
std.fatal("error reading\n")
-> -1
;;
}
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