feat(syscall): Implement syscall dispatch and process lifecycle (exit/wait/sleep)

1 files changed, 71 insertions, 0 deletions

diff --git a/src/lib/string.cc b/src/lib/string.cc
new file mode 100644
index 0000000..bbd079d
--- /dev/null
+++ b/src/lib/string.cc
@@ -0,0 +1,71 @@
+#include "lib/string.h"
+
+void *memset(void *dst, int c, uint n)
+{
+    char *cdst = (char *)dst;
+    for (uint i = 0; i < n; i++)
+        cdst[i] = c;
+    return dst;
+}
+
+int memcmp(const void *v1, const void *v2, uint n)
+{
+    const uchar *s1 = (const uchar *)v1;
+    const uchar *s2 = (const uchar *)v2;
+    while (n-- > 0)
+    {
+        if (*s1 != *s2)
+            return *s1 - *s2;
+        s1++, s2++;
+    }
+    return 0;
+}
+
+void *memmove(void *dst, const void *src, uint n)
+{
+    const char *s = (const char *)src;
+    char *d = (char *)dst;
+    if (s < d && s + n > d)
+    {
+        s += n;
+        d += n;
+        while (n-- > 0)
+            *--d = *--s;
+    }
+    else
+    {
+        while (n-- > 0)
+            *d++ = *s++;
+    }
+    return dst;
+}
+
+void *memcpy(void *dst, const void *src, uint n)
+{
+    return memmove(dst, src, n);
+}
+
+void strcpy(char *dst, const char *src)
+{
+    while (*src)
+        *dst++ = *src++;
+    *dst = 0;
+}
+
+int strlen(const char *s)
+{
+    int n = 0;
+    while (s[n])
+        n++;
+    return n;
+}
+
+int strcmp(const char *s1, const char *s2)
+{
+    while (*s1 && (*s1 == *s2))
+    {
+        s1++;
+        s2++;
+    }
+    return *(const unsigned char *)s1 - *(const unsigned char *)s2;
+}