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1 | /* -*-c-*- |
2 | * |
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3 | * File handles in resource pools |
4 | * |
5 | * (c) 2000 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the mLib utilities library. |
11 | * |
12 | * mLib is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * mLib is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with mLib; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <stdio.h> |
31 | |
32 | #include "pool.h" |
33 | |
34 | /*----- Main code ---------------------------------------------------------*/ |
35 | |
36 | /* --- @pool_fopen@ --- * |
37 | * |
38 | * Arguments: @pool *p@ = pointer to a pool |
39 | * @const char *file@ = name of the file to open |
40 | * @const char *how@ = string specifying opening parameters |
41 | * |
42 | * Returns: A pointer to a pool resource containing an open file handle, |
43 | * or null if the file open filed. |
44 | * |
45 | * Use: Opens a file so that it will be freed again when a pool is |
46 | * destroyed. |
47 | */ |
48 | |
49 | static void pf_destroy(pool_resource *r) { pool_fclose((pool_file *)r); } |
50 | |
51 | pool_file *pool_fopen(pool *p, const char *file, const char *how) |
52 | { |
53 | FILE *fp; |
54 | pool_file *pf; |
55 | |
56 | if ((fp = fopen(file, how)) == 0) |
57 | return (0); |
58 | pf = pool_alloc(p, sizeof(pool_file)); |
59 | POOL_ADD(p, &pf->r, pf_destroy); |
60 | pf->fp = fp; |
61 | return (pf); |
62 | } |
63 | |
64 | /* --- @pool_fclose@ --- * |
65 | * |
66 | * Arguments: @pool_file *pf@ = pointer to a file resource |
67 | * |
68 | * Returns: The response from the @fclose@ function. |
69 | * |
70 | * Use: Closes a file. It is not an error to close a file multiple |
71 | * times. |
72 | */ |
73 | |
74 | int pool_fclose(pool_file *pf) |
75 | { |
76 | if (!pf->r.destroy) |
77 | return (0); |
78 | pf->r.destroy = 0; |
79 | return (fclose(pf->fp)); |
80 | } |
81 | |
82 | /*----- That's all, folks -------------------------------------------------*/ |