From c4ab2f6f440f060b1686991b24379a4998aa55a9 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Thu, 11 Jan 2024 23:53:57 -0500
Subject: file reading, tarfs directory listing

---
 include/mercury/kernel/utility.hpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'include/mercury/kernel/utility.hpp')

diff --git a/include/mercury/kernel/utility.hpp b/include/mercury/kernel/utility.hpp
index f12101a..1648e67 100644
--- a/include/mercury/kernel/utility.hpp
+++ b/include/mercury/kernel/utility.hpp
@@ -29,6 +29,27 @@ namespace mercury::kernel::utility {
     return len;
   }
 
+  //if c appears in str, this returns the index of the last time it appears.
+  //otherwise, this returns len.
+  static inline unsigned find_last(const char *str, unsigned len, char c) {
+    for (unsigned i = len; i > 0; --i)
+      if (str[i - 1] == c)
+        return i - 1;
+    return len;
+  }
+
+  //str1 starts with str2
+  static inline bool starts_with(
+    const char *str1, unsigned str1_len, const char *str2, unsigned str2_len
+  ) {
+    if (str1_len < str2_len)
+      return false;
+    for (unsigned i = 0; i < str2_len; ++i)
+      if (str1[i] != str2[i])
+        return false;
+    return true;
+  }
+
   template <class value_t>
   struct list {
 
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