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 d6437fc..a34cc5c 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;
+}
+