[PATCH 1/3] fs/parseopt: Add parseopt_llu_suffix
From: Philipp Zabel <p.zabel@pengutronix.de>
Date: 2018-02-01 10:37:49
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Add an option parser using strtoull_suffix that can be used to parse a loop mount offset option. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> --- include/parseopt.h | 2 ++ lib/parseopt.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+)
diff --git a/include/parseopt.h b/include/parseopt.h
index 1f9763f8c9..273a371ac3 100644
--- a/include/parseopt.h
+++ b/include/parseopt.h@@ -1,5 +1,7 @@ #ifndef __PARSEOPT_H__ #define __PARSEOPT_H__ +void parseopt_llu_suffix(const char *options, const char *opt, + unsigned long long *val); void parseopt_b(const char *options, const char *opt, bool *val); void parseopt_hu(const char *options, const char *opt, unsigned short *val);
diff --git a/lib/parseopt.c b/lib/parseopt.c
index 8211733e3b..70983066d9 100644
--- a/lib/parseopt.c
+++ b/lib/parseopt.c@@ -122,3 +122,33 @@ again: *val = xstrndup(parsed, endp - parsed); } + +void parseopt_llu_suffix(const char *options, const char *opt, + unsigned long long *val) +{ + const char *start; + size_t optlen = strlen(opt); + unsigned long long v; + char *endp; + +again: + start = strstr(options, opt); + + if (!start) + return; + + if (start > options && start[-1] != ',') { + options = start; + goto again; + } + + if (start[optlen] != '=') { + options = start; + goto again; + } + + v = strtoull_suffix(start + optlen + 1, &endp, 0); + + if (*endp == ',' || *endp == '\0') + *val = v; +}
--
2.15.1
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