[RFC 06/29] util: Add a helper function virStringParseOnOff

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When RNG2C generates codes for builtin 'Bool.on_off', it includes
virStringParseOnOff in those codes.

Signed-off-by: Shi Lei <shi_lei@xxxxxxxxxxxxxx>
---
 src/util/virstring.c | 22 ++++++++++++++++++++++
 src/util/virstring.h |  5 +++++
 2 files changed, 27 insertions(+)

diff --git a/src/util/virstring.c b/src/util/virstring.c
index e9e792f..2d0bb23 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -1404,3 +1404,25 @@ int virStringParseYesNo(const char *str, bool *result)
 
     return 0;
 }
+
+
+/**
+ * virStringParseOnOff:
+ * @str: "on|off" to parse, must not be NULL.
+ * @result: pointer to the boolean result of @str conversion
+ *
+ * Parses a "on|off" string and converts it into a boolean.
+ *
+ * Returns 0 on success and -1 on error.
+ */
+int virStringParseOnOff(const char *str, bool *result)
+{
+    if (STREQ(str, "on"))
+        *result = true;
+    else if (STREQ(str, "off"))
+        *result = false;
+    else
+        return -1;
+
+    return 0;
+}
diff --git a/src/util/virstring.h b/src/util/virstring.h
index 360c683..c528e44 100644
--- a/src/util/virstring.h
+++ b/src/util/virstring.h
@@ -185,6 +185,11 @@ int virStringParsePort(const char *str,
 int virStringParseYesNo(const char *str,
                         bool *result)
     G_GNUC_WARN_UNUSED_RESULT;
+
+int virStringParseOnOff(const char *str,
+                        bool *result)
+    G_GNUC_WARN_UNUSED_RESULT;
+
 /**
  * VIR_AUTOSTRINGLIST:
  *
-- 
2.17.1







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