X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/ad84a60e867db7e3f5e9357b4a16e619e1cacb43..5093cef6808539a5e3b279cabc41d55f1bb5ac71:/sbr/utils.c

diff --git a/sbr/utils.c b/sbr/utils.c
index d8a43c17..d6a96d84 100644
--- a/sbr/utils.c
+++ b/sbr/utils.c
@@ -358,9 +358,33 @@ nmh_strcasestr (const char *s1, const char *s2) {
 }
 
 
+/* HasPrefix returns true if non-NULL s starts with non-NULL prefix. */
+bool HasPrefix(const char *s, const char *prefix)
+{
+    while (*s && *s == *prefix) {
+        s++;
+        prefix++;
+    }
+
+    return *prefix == '\0';
+}
+
+
+/* HasSuffix returns true if non-NULL s ends with non-NULL suffix. */
+bool HasSuffix(const char *s, const char *suffix)
+{
+    size_t ls, lsuf;
+
+    ls = strlen(s);
+    lsuf = strlen(suffix);
+
+    return lsuf <= ls && !strcmp(s + ls - lsuf, suffix);
+}
+
+
 /* HasSuffixC returns true if non-NULL string s ends with a c before the
  * terminating NUL. */
-bool HasSuffixC(char *s, int c)
+bool HasSuffixC(const char *s, int c)
 {
     return *s && s[strlen(s) - 1] == c;
 }
@@ -490,7 +514,7 @@ nmh_version_changed (int older) {
            break for versions with multiple decimal points, etc. */
         const float current_version = strtof (VERSION, NULL);
         const float old_version =
-            context_version  &&  strncmp (context_version, "nmh-", 4) == 0
+            context_version  &&  HasPrefix(context_version, "nmh-")
             ?  strtof (context_version + 4, NULL)
             :  99999999;