diff options
| author | Denis Vlasenko <vda.linux@googlemail.com> | 2007-04-19 00:09:34 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2007-04-19 00:09:34 +0000 |
| commit | c34d35557b0eeb1971b65f7fb10b814295d61734 (patch) | |
| tree | cd86426279c964e2960cbe51c4bf0e1e97263492 /libbb/loop.c | |
| parent | 3ace9fa6d8f40886855458759455ecb9f16a6f12 (diff) | |
| download | busybox-c34d35557b0eeb1971b65f7fb10b814295d61734.tar.gz | |
loop device code: readability improvement
Diffstat (limited to 'libbb/loop.c')
| -rw-r--r-- | libbb/loop.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/libbb/loop.c b/libbb/loop.c index 9818a30cb..9559d429a 100644 --- a/libbb/loop.c +++ b/libbb/loop.c @@ -84,7 +84,7 @@ int set_loop(char **device, const char *file, unsigned long long offset) char dev[20], *try; bb_loop_info loopinfo; struct stat statbuf; - int i, dfd, ffd, mode, rc=-1; + int i, dfd, ffd, mode, rc = -1; /* Open the file. Barf if this doesn't work. */ mode = O_RDWR; @@ -98,12 +98,12 @@ int set_loop(char **device, const char *file, unsigned long long offset) /* Find a loop device. */ try = *device ? : dev; - for (i=0;rc;i++) { + for (i = 0; rc; i++) { sprintf(dev, LOOP_FORMAT, i); /* Ran out of block devices, return failure. */ if (stat(try, &statbuf) || !S_ISBLK(statbuf.st_mode)) { - rc=-ENOENT; + rc = -ENOENT; break; } /* Open the sucker and check its loopiness. */ @@ -112,19 +112,22 @@ int set_loop(char **device, const char *file, unsigned long long offset) mode = O_RDONLY; dfd = open(try, mode); } - if (dfd < 0) goto try_again; + if (dfd < 0) + goto try_again; rc = ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo); - /* If device free, claim it. */ + /* If device is free, claim it. */ if (rc && errno == ENXIO) { memset(&loopinfo, 0, sizeof(loopinfo)); safe_strncpy((char *)loopinfo.lo_file_name, file, LO_NAME_SIZE); loopinfo.lo_offset = offset; /* Associate free loop device with file. */ if (!ioctl(dfd, LOOP_SET_FD, ffd)) { - if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) rc = 0; - else ioctl(dfd, LOOP_CLR_FD, 0); + if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) + rc = 0; + else + ioctl(dfd, LOOP_CLR_FD, 0); } /* If this block device already set up right, re-use it. @@ -132,7 +135,7 @@ int set_loop(char **device, const char *file, unsigned long long offset) file isn't pretty either. In general, mounting the same file twice without using losetup manually is problematic.) */ - } else if (strcmp(file,(char *)loopinfo.lo_file_name) + } else if (strcmp(file, (char *)loopinfo.lo_file_name) != 0 || offset != loopinfo.lo_offset) { rc = -1; } @@ -142,8 +145,9 @@ try_again: } close(ffd); if (!rc) { - if (!*device) *device = xstrdup(dev); - return mode==O_RDONLY ? 1 : 0; + if (!*device) + *device = xstrdup(dev); + return (mode == O_RDONLY) ? 1 : 0; } return rc; } |