Move check_ntp's extract_value to utils_base.c.

This function can also be used to parse performance data strings which
could be useful in the future.

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/utils_base.c b/lib/utils_base.c
index d6437fc8..a34cc5cc 100644
--- a/lib/utils_base.c
+++ b/lib/utils_base.c
@@ -251,3 +251,60 @@ int np_warn_if_not_root(void) {
 	}
 	return status;
 }
+
+/*
+ * Extract the value from key/value pairs, or return NULL. The value returned
+ * can be free()ed.
+ * This function can be used to parse NTP control packet data and performance
+ * data strings.
+ */
+char *np_extract_value(const char *varlist, const char *name) {
+	char *tmp=NULL, *value=NULL;
+	int i;
+
+	while (1) {
+		/* Strip any leading space */
+		for (varlist; isspace(varlist[0]); varlist++);
+
+		if (strncmp(name, varlist, strlen(name)) == 0) {
+			varlist += strlen(name);
+			/* strip trailing spaces */
+			for (varlist; isspace(varlist[0]); varlist++);
+
+			if (varlist[0] == '=') {
+				/* We matched the key, go past the = sign */
+				varlist++;
+				/* strip leading spaces */
+				for (varlist; isspace(varlist[0]); varlist++);
+
+				if (tmp = index(varlist, ',')) {
+					/* Value is delimited by a comma */
+					if (tmp-varlist == 0) continue;
+					value = (char *)malloc(tmp-varlist+1);
+					strncpy(value, varlist, tmp-varlist);
+					value[tmp-varlist] = '\0';
+				} else {
+					/* Value is delimited by a \0 */
+					if (strlen(varlist) == 0) continue;
+					value = (char *)malloc(strlen(varlist) + 1);
+					strncpy(value, varlist, strlen(varlist));
+					value[strlen(varlist)] = '\0';
+				}
+				break;
+			}
+		}
+		if (tmp = index(varlist, ',')) {
+			/* More keys, keep going... */
+			varlist = tmp + 1;
+		} else {
+			/* We're done */
+			break;
+		}
+	}
+
+	/* Clean-up trailing spaces/newlines */
+	if (value) for (i=strlen(value)-1; isspace(value[i]); i--) value[i] = '\0';
+
+	return value;
+}
+