Rob Pike | 69b74c3 | 2008-06-12 13:26:16 -0700 | [diff] [blame] | 1 | /* |
| 2 | Inferno lib9/readn.c |
| 3 | http://code.google.com/p/inferno-os/source/browse/lib9/readn.c |
| 4 | |
| 5 | Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. |
| 6 | Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved. |
| 7 | |
| 8 | Permission is hereby granted, free of charge, to any person obtaining a copy |
| 9 | of this software and associated documentation files (the "Software"), to deal |
| 10 | in the Software without restriction, including without limitation the rights |
| 11 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 12 | copies of the Software, and to permit persons to whom the Software is |
| 13 | furnished to do so, subject to the following conditions: |
| 14 | |
| 15 | The above copyright notice and this permission notice shall be included in |
| 16 | all copies or substantial portions of the Software. |
| 17 | |
| 18 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 21 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 23 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 24 | THE SOFTWARE. |
| 25 | */ |
| 26 | |
Rob Pike | e1325d9 | 2009-08-17 15:14:59 -0700 | [diff] [blame] | 27 | #include <u.h> |
| 28 | #include <libc.h> |
Rob Pike | 69b74c3 | 2008-06-12 13:26:16 -0700 | [diff] [blame] | 29 | |
| 30 | long |
| 31 | readn(int f, void *av, long n) |
| 32 | { |
| 33 | char *a; |
| 34 | long m, t; |
| 35 | |
| 36 | a = av; |
| 37 | t = 0; |
| 38 | while(t < n){ |
| 39 | m = read(f, a+t, n-t); |
| 40 | if(m <= 0){ |
| 41 | if(t == 0) |
| 42 | return m; |
| 43 | break; |
| 44 | } |
| 45 | t += m; |
| 46 | } |
| 47 | return t; |
| 48 | } |