From d1ff7bcc91886626dc9060ec5fb67ee102ab7c1d Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Mon, 11 Mar 2024 21:30:31 -0400
Subject: usermode capable kernel with logging syscall

---
 lib/mem.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 lib/mem.c

(limited to 'lib/mem.c')

diff --git a/lib/mem.c b/lib/mem.c
new file mode 100644
index 0000000..b60fbbd
--- /dev/null
+++ b/lib/mem.c
@@ -0,0 +1,52 @@
+#include "string.h"
+#include "mem/memory.h"
+
+void*
+memset(void *dest, int c, size_t n)
+{
+    char *destc = (char*)dest;
+    for(size_t i = 0; i < n; i++)
+        destc[i] = c;
+    return dest;
+}
+
+void*
+memcpy(void *dest, const void *src, size_t n)
+{
+    char *destc = (char*)dest;
+    const char *srcc = (const char*)src;
+    for(size_t i = 0; i < n; i++)
+        destc[i] = srcc[i];
+    return dest;
+}
+
+void*
+memmove(void *dest, const void *src, size_t n)
+{
+    char *destc = (char*)dest;
+    const char *srcc = (const char*)src;
+    if(destc + n < srcc) return memcpy(dest, src, n);
+    char buffer[n];
+    memcpy(buffer, src, n);
+    return memcpy(destc, buffer, n);
+}
+
+int
+memcmp(const void *a, const void *b, size_t n)
+{
+    const char *ac = (const char*)a;
+    const char *bc = (const char*)b;
+    for(size_t i = 0; i < n; i++) {
+        if(ac[i] != bc[i]) return ac[i] - bc[i];
+    }
+    return 0;
+}
+
+char*
+strdup(const char *s)
+{
+    size_t slen = strlen(s);
+    char *ret = mem_alloc(slen);
+    memcpy(ret, s, slen);
+    return ret;
+}
-- 
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