[SDK:CRT] Implement more string routines

SDK/CRT/STRING/str.c

@@ -43,3 +43,87 @@ strnlen (
 
     return len - sizeof(char);
 }
+
+int
+strcmp (
+    const char* s1,
+    const char* s2
+    )
+
+{
+    while (*s1 == *s2) {
+        if (*s1 == '\0') {
+            return 0;
+        }
+
+        s1++;
+        s2++;
+    }
+
+    return *(unsigned char *)s1 - *(unsigned char*)s2;
+}
+
+int
+strncmp (
+    const char* s1,
+    const char* s2,
+    size_t n
+    )
+
+{
+    while (n > 0) {
+        if (*s1 != *s2) {
+            return *(unsigned char *)s1 - *(unsigned char*)s2;
+        }
+
+        if (*s1 == '\0') {
+            return 0;
+        }
+
+        n--;
+        s1++;
+        s2++;
+    }
+
+    return 0;
+}
+
+char *
+strchr (
+    const char *s,
+    int c
+    )
+
+{
+    while (*s != (char)c) {
+        if (!*s) {
+            return NULL;
+        }
+
+        s++;
+    }
+
+    return (char *)s;
+}
+
+char *
+strstr (
+    const char *haystack,
+    const char *needle
+    )
+
+{
+    const char *ptr = haystack;
+
+    if (!*needle) {
+        return (char *)haystack;
+    }
+
+    while ((ptr = strchr(ptr, *needle)) != NULL) {
+        if (strcmp(ptr, needle) == 0) {
+            return (char *)ptr;
+        }
+    }
+
+    return NULL;
+}

SDK/CRT/STRING/wstr.c

@@ -43,3 +43,87 @@ wcsnlen (
 
     return len - sizeof(wchar_t);
 }
+
+int
+wcscmp (
+    const wchar_t* s1,
+    const wchar_t* s2
+    )
+
+{
+    while (*s1 == *s2) {
+        if (*s1 == '\0') {
+            return 0;
+        }
+
+        s1++;
+        s2++;
+    }
+
+    return *s1 - *s2;
+}
+
+int
+wcsncmp (
+    const wchar_t* s1,
+    const wchar_t* s2,
+    size_t n
+    )
+
+{
+    while (n > 0) {
+        if (*s1 != *s2) {
+            return *s1 - *s2;
+        }
+
+        if (*s1 == '\0') {
+            return 0;
+        }
+
+        n--;
+        s1++;
+        s2++;
+    }
+
+    return 0;
+}
+
+wchar_t *
+wcschr (
+    const wchar_t *wcs,
+    wchar_t wc
+    )
+
+{
+    while (*wcs != wc) {
+        if (!*wcs) {
+            return NULL;
+        }
+
+        wcs++;
+    }
+
+    return (wchar_t *)wcs;
+}
+
+wchar_t *
+wcsstr (
+    const wchar_t *haystack,
+    const wchar_t *needle
+    )
+
+{
+    const wchar_t *ptr = haystack;
+
+    if (!*needle) {
+        return (wchar_t *)haystack;
+    }
+
+    while ((ptr = wcschr(ptr, *needle)) != NULL) {
+        if (wcscmp(ptr, needle) == 0) {
+            return (wchar_t *)ptr;
+        }
+    }
+
+    return NULL;
+}

SDK/INC/CRT/string.h

@@ -26,6 +26,10 @@ extern "C" {
 
 size_t strlen(const char *str);
 size_t strnlen(const char *str, size_t maxlen);
+int strcmp(const char* s1, const char* s2);
+int strncmp(const char* s1, const char* s2, size_t n);
+char *strchr(const char *s, int c);
+char *strstr(const char *haystack, const char *needle);
 
 void *memset(void *dest, int c, size_t count);
 void *memcpy(void *dest, const void *src, size_t count);

SDK/INC/CRT/wchar.h

@@ -26,6 +26,10 @@ extern "C" {
 
 size_t wcslen(const wchar_t *str);
 size_t wcsnlen(const wchar_t *str, size_t maxlen);
+int wcscmp(const wchar_t* s1, const wchar_t* s2);
+int wcsncmp(const wchar_t* s1, const wchar_t* s2, size_t n);
+wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
+wchar_t *wcsstr(const wchar_t *haystack, const wchar_t *needle);
 
 wchar_t *wmemset(wchar_t *dest, wchar_t c, size_t count);
 wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, size_t count);