From 7600bc55824921e1119fb0a72fd9fc5a63ca2c18 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Sat, 22 Oct 2022 21:13:22 +0200
Subject: [PATCH] libc: Add strings.h

---
 libs/libc/include/string.h  |  3 ---
 libs/libc/include/strings.h | 27 +++++++++++++++++++++++
 libs/libc/src/string.cpp    |  5 -----
 libs/libc/src/strings.cpp   | 43 +++++++++++++++++++++++++++++++++++++
 4 files changed, 70 insertions(+), 8 deletions(-)
 create mode 100644 libs/libc/include/strings.h
 create mode 100644 libs/libc/src/strings.cpp

diff --git a/libs/libc/include/string.h b/libs/libc/include/string.h
index 88e133b2..854c2eab 100644
--- a/libs/libc/include/string.h
+++ b/libs/libc/include/string.h
@@ -80,9 +80,6 @@ extern "C"
     /* Returns the error string associated with the error number err. */
     char* strerror(int err);
 
-    /* Clears n bytes of buf. */
-    void* bzero(void* buf, size_t n);
-
     /* Copies the string src into dest. This function is unsafe, use strlcpy instead. */
     __lc_deprecated("strcpy is unsafe and should not be used; use strlcpy instead") char* strcpy(char* dest,
                                                                                                  const char* src);
diff --git a/libs/libc/include/strings.h b/libs/libc/include/strings.h
new file mode 100644
index 00000000..dd0952ad
--- /dev/null
+++ b/libs/libc/include/strings.h
@@ -0,0 +1,27 @@
+#ifndef _STRINGS_H
+#define _STRINGS_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Clears n bytes of buf. */
+    void bzero(void* buf, size_t n);
+
+    /* Copies n bytes of src into dest. */
+    void bcopy(void* dest, const void* src, size_t n);
+
+    /* Compares strings a and b while treating uppercase and lowercase characters as the same. */
+    int strcasecmp(const char* a, const char* b);
+
+    /* Compares at most max bytes of strings a and b while treating uppercase and lowercase characters as the same. */
+    int strncasecmp(const char* a, const char* b, size_t max);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
\ No newline at end of file
diff --git a/libs/libc/src/string.cpp b/libs/libc/src/string.cpp
index 7ba70640..85106fd1 100644
--- a/libs/libc/src/string.cpp
+++ b/libs/libc/src/string.cpp
@@ -230,11 +230,6 @@ extern "C"
         return NULL;
     }
 
-    void* bzero(void* buf, size_t n)
-    {
-        return memset(buf, 0, n);
-    }
-
     char* strstr(const char* haystack, const char* needle)
     {
         size_t needle_size = strlen(needle);
diff --git a/libs/libc/src/strings.cpp b/libs/libc/src/strings.cpp
new file mode 100644
index 00000000..5dee123f
--- /dev/null
+++ b/libs/libc/src/strings.cpp
@@ -0,0 +1,43 @@
+#include <ctype.h>
+#include <string.h>
+#include <strings.h>
+
+static char fold(char c)
+{
+    if (isalpha(c)) return tolower(c);
+    return c;
+}
+
+extern "C"
+{
+    void bzero(void* buf, size_t n)
+    {
+        memset(buf, 0, n);
+    }
+
+    void bcopy(void* dest, const void* src, size_t n)
+    {
+        memcpy(dest, src, n);
+    }
+
+    int strcasecmp(const char* a, const char* b)
+    {
+        while (*a && (fold(*a) == fold(*b)))
+        {
+            a++;
+            b++;
+        }
+        return (unsigned char)fold(*a) - (unsigned char)fold(*b);
+    }
+
+    int strncasecmp(const char* a, const char* b, size_t max)
+    {
+        const char* base = a;
+        while (*a && (fold(*a) == fold(*b)) && (size_t)(a - base) < (max - 1))
+        {
+            a++;
+            b++;
+        }
+        return (unsigned char)fold(*a) - (unsigned char)fold(*b);
+    }
+}
\ No newline at end of file