Add parse_bool() to centralize parsing boolean options

This way debug commands which previously took only yes/no or on/off or
enable/disable can take any of those options.

BUG=chrome-os-partner:18467
BRANCH=none
TEST=Try "on", "off", "yes", "no", "true", "false", "ena", "disable", for
each of the following commands:
  - ilim (spring)
  - pll (link)
  - power (spring/snow)
  - hcdebug (all)
  - kblog (link)
  - ksscan (all)
  - lp5562 (spring)

Change-Id: Ie8e0fae3775b1da711864bcba6682ba5e68a06f1
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/46900
Reviewed-by: Bill Richardson <wfrichar@chromium.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/util.h b/include/util.h
index eca264a3f7..c953e468f8 100644
--- a/include/util.h
+++ b/include/util.h
@@ -84,6 +84,25 @@ int strtoi(const char *nptr, char **endptr, int base);
 /* Like strncpy(), but guarantees null termination. */
 char *strzcpy(char *dest, const char *src, int len);
 
+/**
+ * Parses a boolean option from a string.
+ *
+ * Strings that set *dest=0 and return 1 (all case-insensitive):
+ *   "off"
+ *   "dis*"
+ *   "n*"
+ *   "f*"
+ *
+ * Strings that set *dest=1 and return 1 (all case-insensitive):
+ *   "on"
+ *   "ena*"
+ *   "y*"
+ *   "t*"
+ *
+ * Other strings return 0 and leave *dest unchanged.
+ */
+int parse_bool(const char *s, int *dest);
+
 int tolower(int c);
 
 /* 64-bit divide-and-modulo.  Does the equivalent of: