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authorBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2005-10-15 14:13:09 +0000
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2005-10-15 14:13:09 +0000
commit94c3331d47ae08167e5122a3023ffc3340274698 (patch)
tree56125536e0c17df62ce4e8b50449d89b1a424103
parentb4b6d262872c1e3887efc2836e8dd2f64e8651eb (diff)
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- an empty middle term in ?: violates ISO C
- use shorter boilerplate and use C89 style comments
-rw-r--r--libbb/loop.c53
1 files changed, 22 insertions, 31 deletions
diff --git a/libbb/loop.c b/libbb/loop.c
index f7029d591..06b5185b6 100644
--- a/libbb/loop.c
+++ b/libbb/loop.c
@@ -2,21 +2,9 @@
2/* 2/*
3 * Utility routines. 3 * Utility routines.
4 * 4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> 5 * Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
6 * 6 *
7 * This program is free software; you can redistribute it and/or modify 7 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */ 8 */
21 9
22 10
@@ -75,11 +63,12 @@ extern int del_loop(const char *device)
75 return rc; 63 return rc;
76} 64}
77 65
78// Returns 0 if mounted RW, 1 if mounted read-only, <0 for error. 66/* Returns 0 if mounted RW, 1 if mounted read-only, <0 for error.
79// *device is loop device to use, or if *device==NULL finds a loop device to 67 *device is loop device to use, or if *device==NULL finds a loop device to
80// mount it on and sets *device to a strdup of that loop device name. This 68 mount it on and sets *device to a strdup of that loop device name. This
81// search will re-use an existing loop device already bound to that 69 search will re-use an existing loop device already bound to that
82// file/offset if it finds one. 70 file/offset if it finds one.
71 */
83extern int set_loop(char **device, const char *file, int offset) 72extern int set_loop(char **device, const char *file, int offset)
84{ 73{
85 char dev[20]; 74 char dev[20];
@@ -87,37 +76,39 @@ extern int set_loop(char **device, const char *file, int offset)
87 struct stat statbuf; 76 struct stat statbuf;
88 int i, dfd, ffd, mode, rc=1; 77 int i, dfd, ffd, mode, rc=1;
89 78
90 // Open the file. Barf if this doesn't work. 79 /* Open the file. Barf if this doesn't work. */
91 if((ffd = open(file, mode=O_RDWR))<0 && (ffd = open(file,mode=O_RDONLY))<0) 80 if((ffd = open(file, mode=O_RDWR))<0 && (ffd = open(file,mode=O_RDONLY))<0)
92 return errno; 81 return errno;
93 82
94 // Find a loop device 83 /* Find a loop device. */
95 for(i=0;rc;i++) { 84 for(i=0;rc;i++) {
96 sprintf(dev, LOOP_FORMAT, i++); 85 sprintf(dev, LOOP_FORMAT, i++);
97 // Ran out of block devices, return failure. 86 /* Ran out of block devices, return failure. */
98 if(stat(*device ? : dev, &statbuf) || !S_ISBLK(statbuf.st_mode)) { 87 if(stat(*device ? *device : dev, &statbuf) ||
88 !S_ISBLK(statbuf.st_mode)) {
99 rc=ENOENT; 89 rc=ENOENT;
100 break; 90 break;
101 } 91 }
102 // Open the sucker and check its loopiness. 92 /* Open the sucker and check its loopiness. */
103 if((dfd=open(dev, mode))<0 && errno==EROFS) 93 if((dfd=open(dev, mode))<0 && errno==EROFS)
104 dfd=open(dev,mode=O_RDONLY); 94 dfd=open(dev,mode=O_RDONLY);
105 if(dfd<0) continue; 95 if(dfd<0) continue;
106 96
107 rc=ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo); 97 rc=ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo);
108 // If device free, claim it. 98 /* If device free, claim it. */
109 if(rc && errno==ENXIO) { 99 if(rc && errno==ENXIO) {
110 memset(&loopinfo, 0, sizeof(loopinfo)); 100 memset(&loopinfo, 0, sizeof(loopinfo));
111 safe_strncpy(loopinfo.lo_file_name, file, LO_NAME_SIZE); 101 safe_strncpy(loopinfo.lo_file_name, file, LO_NAME_SIZE);
112 loopinfo.lo_offset = offset; 102 loopinfo.lo_offset = offset;
113 // Associate free loop device with file 103 /* Associate free loop device with file. */
114 if(!ioctl(dfd, LOOP_SET_FD, ffd) && 104 if(!ioctl(dfd, LOOP_SET_FD, ffd) &&
115 !ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) rc=0; 105 !ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) rc=0;
116 else ioctl(dfd, LOOP_CLR_FD, 0); 106 else ioctl(dfd, LOOP_CLR_FD, 0);
117 // If this block device already set up right, re-use it. 107 /* If this block device already set up right, re-use it.
118 // (Yes this is racy, but associating two loop devices with the same 108 (Yes this is racy, but associating two loop devices with the same
119 // file isn't pretty either. In general, mounting the same file twice 109 file isn't pretty either. In general, mounting the same file twice
120 // without using losetup manually is problematic.) 110 without using losetup manually is problematic.)
111 */
121 } else if(strcmp(file,loopinfo.lo_file_name) 112 } else if(strcmp(file,loopinfo.lo_file_name)
122 || offset!=loopinfo.lo_offset) rc=1; 113 || offset!=loopinfo.lo_offset) rc=1;
123 close(dfd); 114 close(dfd);