LibC: Add strtok_r() and make strtok() a wrapper around it

Libraries/LibC/string.cpp

@@ -455,24 +455,22 @@ char* strpbrk(const char* s, const char* accept)
     return nullptr;
 }
 
-char* strtok(char* str, const char* delim)
+char* strtok_r(char* str, const char* delim, char** saved_str)
 {
-    static char* saved_str;
-    
     if (!str) {
         if (!saved_str)
             return nullptr;
-        str = saved_str;
+        str = *saved_str;
     }
-    
+
     size_t token_start = 0;
     size_t token_end = 0;
     size_t str_len = strlen(str);
     size_t delim_len = strlen(delim);
-    
+
     for (size_t i = 0; i < str_len; ++i) {
         bool is_proper_delim = false;
-        
+
         for (size_t j = 0; j < delim_len; ++j) {
             if (str[i] == delim[j]) {
                 // Skip beginning delimiters
@@ -480,31 +478,37 @@ char* strtok(char* str, const char* delim)
                     ++token_start;
                     break;
                 }
-                
+
                 is_proper_delim = true;
             }
         }
-        
+
         ++token_end;
         if (is_proper_delim && token_end > 0) {
             --token_end;
             break;
         }
     }
-    
+
     if (str[token_start] == '\0')
         return nullptr;
-    
+
     if (token_end == 0) {
-        saved_str = nullptr;
+        *saved_str = nullptr;
         return &str[token_start];
     }
-    
-    saved_str = &str[token_end + 1];
+
+    *saved_str = &str[token_end + 1];
     str[token_end] = '\0';
     return &str[token_start];
 }
 
+char* strtok(char* str, const char* delim)
+{
+    static char* saved_str;
+    return strtok_r(str, delim, &saved_str);
+}
+
 int strcoll(const char* s1, const char* s2)
 {
     return strcmp(s1, s2);

Libraries/LibC/string.h

@@ -31,6 +31,7 @@ size_t strcspn(const char*, const char* reject);
 char* strerror(int errnum);
 char* strsignal(int signum);
 char* strpbrk(const char*, const char* accept);
+char* strtok_r(char* str, const char* delim, char** saved_str);
 char* strtok(char* str, const char* delim);
 int strcoll(const char* s1, const char* s2);
 size_t strxfrm(char* dest, const char* src, size_t n);