projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| c4665c80 TL |
1 | .TH FSEEK 3S |
| 2 | .SH NAME | |
| 3 | fseek, ftell, rewind \- reposition a stream | |
| 4 | .SH SYNOPSIS | |
| 5 | .B #include <stdio.h> | |
| 6 | .PP | |
| 7 | .B fseek(stream, offset, ptrname) | |
| 8 | .br | |
| 9 | .SM | |
| 10 | .B FILE | |
| 11 | .B *stream; | |
| 12 | .br | |
| 13 | .B long offset; | |
| 14 | .PP | |
| 15 | .B long ftell(stream) | |
| 16 | .br | |
| 17 | .SM | |
| 18 | .B FILE | |
| 19 | .B *stream; | |
| 20 | .PP | |
| 21 | .B rewind(stream) | |
| 22 | .SH DESCRIPTION | |
| 23 | .I Fseek | |
| 24 | sets the position of the next input or output | |
| 25 | operation on the | |
| 26 | .IR stream . | |
| 27 | The new position is at the signed distance | |
| 28 | .I offset | |
| 29 | bytes | |
| 30 | from the beginning, the current position, or the end of the file, | |
| 31 | according as | |
| 32 | .I ptrname | |
| 33 | has the value 0, 1, or 2. | |
| 34 | .PP | |
| 35 | .I Fseek | |
| 36 | undoes any effects of | |
| 37 | .IR ungetc (3). | |
| 38 | .PP | |
| 39 | .I Ftell | |
| 40 | returns the current value of the offset relative to the beginning | |
| 41 | of the file associated with the named | |
| 42 | .IR stream . | |
| 43 | It is measured in bytes on UNIX; | |
| 44 | on some other systems it is a magic cookie, | |
| 45 | and the only foolproof way to obtain an | |
| 46 | .I offset | |
| 47 | for | |
| 48 | .IR fseek . | |
| 49 | .PP | |
| 50 | .I Rewind(stream) | |
| 51 | is equivalent to | |
| 52 | .I "fseek(stream, 0L, 0)." | |
| 53 | .SH "SEE ALSO" | |
| 54 | lseek(2), | |
| 55 | fopen(3) | |
| 56 | .SH DIAGNOSTICS | |
| 57 | .I Fseek | |
| 58 | returns \-1 for improper seeks. |