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author | Karel Zak | 2012-05-03 17:28:44 +0200 |
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committer | Karel Zak | 2012-05-03 17:28:44 +0200 |
commit | 5ef167714e58132b969cfa4c185ae0159705ca0f (patch) | |
tree | 1ba601a1f1157f3a554a4b74c0b9a16126a91926 /lib/strutils.c | |
parent | lsblk: fix /sys/.../ro usage (diff) | |
download | kernel-qcow2-util-linux-5ef167714e58132b969cfa4c185ae0159705ca0f.tar.gz kernel-qcow2-util-linux-5ef167714e58132b969cfa4c185ae0159705ca0f.tar.xz kernel-qcow2-util-linux-5ef167714e58132b969cfa4c185ae0159705ca0f.zip |
lib/strutils: add string_to_bitmask()
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'lib/strutils.c')
-rw-r--r-- | lib/strutils.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/strutils.c b/lib/strutils.c index 372558acd..bdcdef342 100644 --- a/lib/strutils.c +++ b/lib/strutils.c @@ -470,6 +470,49 @@ int string_to_bitarray(const char *list, } /* + * LIST ::= <item> [, <item>] + * + * The <item> is translated to 'id' by name2flag() function and the flags is + * set to the 'mask' +* + * Returns: 0 on success, <0 on error. + */ +int string_to_bitmask(const char *list, + unsigned long *mask, + long (*name2flag)(const char *, size_t)) +{ + const char *begin = NULL, *p; + + if (!list || !name2flag || !mask) + return -EINVAL; + + for (p = list; p && *p; p++) { + const char *end = NULL; + long flag; + + if (!begin) + begin = p; /* begin of the level name */ + if (*p == ',') + end = p; /* terminate the name */ + if (*(p + 1) == '\0') + end = p + 1; /* end of string */ + if (!begin || !end) + continue; + if (end <= begin) + return -1; + + flag = name2flag(begin, end - begin); + if (flag < 0) + return flag; /* error */ + *mask |= flag; + begin = NULL; + if (end && !*end) + break; + } + return 0; +} + +/* * Parse the lower and higher values in a string containing * "lower:higher" or "lower-higher" format. Note that either * the lower or the higher values may be missing, and the def |