1 files changed, 24 insertions, 0 deletions
diff --git a/prism/util/pm_strncasecmp.c b/prism/util/pm_strncasecmp.c
new file mode 100644
index 0000000000..2240bf8110
--- /dev/null
+++ b/prism/util/pm_strncasecmp.c
@@ -0,0 +1,24 @@
+#include "prism/util/pm_strncasecmp.h"
+
+/**
+ * Compare two strings, ignoring case, up to the given length. Returns 0 if the
+ * strings are equal, a negative number if string1 is less than string2, or a
+ * positive number if string1 is greater than string2.
+ *
+ * Note that this is effectively our own implementation of strncasecmp, but it's
+ * not available on all of the platforms we want to support so we're rolling it
+ * here.
+ */
+int
+pm_strncasecmp(const uint8_t *string1, const uint8_t *string2, size_t length) {
+    size_t offset = 0;
+    int difference = 0;
+
+    while (offset < length && string1[offset] != '\0') {
+        if (string2[offset] == '\0') return string1[offset];
+        if ((difference = tolower(string1[offset]) - tolower(string2[offset])) != 0) return difference;
+        offset++;
+    }
+
+    return difference;
+}