scpi: Add function to strictly parse bool strings.

This patch adds a function that is similar to sr_parse_boolstring but its
matching rules are more strict.

diff --git a/hardware/common/scpi.c b/hardware/common/scpi.c
index d8f5a2b1270115c9a733561e72e3d122c43f28ee..f932854fe9dd29602445de47928e2489d8af3681 100644 (file)
--- a/hardware/common/scpi.c
+++ b/hardware/common/scpi.c
@@ -34,6 +34,46 @@
 #define SCPI_READ_RETRIES 100
 #define SCPI_READ_RETRY_TIMEOUT 10000
 
+/**
+ * Parse a string representation of a boolean-like value into a gboolean.
+ * Similar to sr_parse_boolstring but rejects strings which do not represent
+ * a boolean-like value.
+ *
+ * @param str String to convert.
+ * @param ret Pointer to a gboolean where the result of the conversion will be
+ * stored.
+ *
+ * @return SR_OK on success, SR_ERR on failure.
+ */
+static int sr_parse_strict_bool(const char *str, gboolean *ret)
+{
+       if (!str)
+               return SR_ERR_ARG;
+
+       if (!g_strcmp0(str, "1") ||
+           !g_ascii_strncasecmp(str, "y", 1) ||
+           !g_ascii_strncasecmp(str, "t", 1) ||
+           !g_ascii_strncasecmp(str, "yes", 3) ||
+           !g_ascii_strncasecmp(str, "true", 4) ||
+           !g_ascii_strncasecmp(str, "on", 2)) {
+
+               *ret = TRUE;
+               return SR_OK;
+
+       } else if (!g_strcmp0(str, "0") ||
+                  !g_ascii_strncasecmp(str, "n", 1) ||
+                  !g_ascii_strncasecmp(str, "f", 1) ||
+                  !g_ascii_strncasecmp(str, "no", 2) ||
+                  !g_ascii_strncasecmp(str, "false", 5) ||
+                  !g_ascii_strncasecmp(str, "off", 3)) {
+
+               *ret = FALSE;
+               return SR_OK;
+       }
+
+       return SR_ERR;
+}
+
 /**
  * Send a SCPI command.
  *