conffile: add bool support

conf_get_bool() interprets various strings as 'true' or 'false'.
If no suitable value is found, the default is returned.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

2 files changed, 34 insertions, 0 deletions

diff --git a/support/include/conffile.h b/support/include/conffile.h
index a6d5846..3fe3a78 100644
--- a/support/include/conffile.h
+++ b/support/include/conffile.h
@@ -36,6 +36,7 @@
 #include <sys/queue.h>
 #include <ctype.h>
 #include <stdint.h>
+#include <stdbool.h>
 
 struct conf_list_node {
 	TAILQ_ENTRY(conf_list_node) link;
@@ -57,6 +58,7 @@ extern struct sockaddr *conf_get_address(char *, char *);
 extern struct conf_list *conf_get_list(char *, char *);
 extern struct conf_list *conf_get_tag_list(char *, char *);
 extern int      conf_get_num(char *, char *, int);
+extern _Bool    conf_get_bool(char *, char *, _Bool);
 extern char    *conf_get_str(char *, char *);
 extern char    *conf_get_section(char *, char *, char *);
 extern void     conf_init(void);
diff --git a/support/nfs/conffile.c b/support/nfs/conffile.c
index 6b94ec0..609d782 100644
--- a/support/nfs/conffile.c
+++ b/support/nfs/conffile.c
@@ -446,6 +446,38 @@ conf_get_num(char *section, char *tag, int def)
 	return def;
 }
 
+/*
+ * Return the Boolean value denoted by TAG in section SECTION, or DEF
+ * if that tags does not exist.
+ * FALSE is returned for case-insensitve comparisons with 0, f, false, n, no, off
+ * TRUE is returned for 1, t, true, y, yes, on
+ * A failure to match one of these results in DEF
+ */
+_Bool
+conf_get_bool(char *section, char *tag, _Bool def)
+{
+	char *value = conf_get_str(section, tag);
+
+	if (!value)
+		return def;
+	if (strcasecmp(value, "1") == 0 ||
+	    strcasecmp(value, "t") == 0 ||
+	    strcasecmp(value, "true") == 0 ||
+	    strcasecmp(value, "y") == 0 ||
+	    strcasecmp(value, "yes") == 0 ||
+	    strcasecmp(value, "on") == 0)
+		return true;
+
+	if (strcasecmp(value, "0") == 0 ||
+	    strcasecmp(value, "f") == 0 ||
+	    strcasecmp(value, "false") == 0 ||
+	    strcasecmp(value, "n") == 0 ||
+	    strcasecmp(value, "no") == 0 ||
+	    strcasecmp(value, "off") == 0)
+		return false;
+	return def;
+}
+
 /* Validate X according to the range denoted by TAG in section SECTION.  */
 int
 conf_match_num(char *section, char *tag, int x)