Berry failed port attempt leftovers :(

libstring/string.c

@@ -132,33 +132,59 @@ char* strcat (char* dest, const char* src) {
   return rdest;
 }
 
-int isalnum (int c) { return isalpha (c) || isdigit (c); }
-
-int isalpha (int c) { return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); }
-
-int iscntrl (int c) { return (c >= 0 && c <= 32) || (c == 127); }
-
-int isdigit (int c) { return (c >= '0' && c <= '9'); }
-
-int isgraph (int c) { return (c > 32 && c <= 126); }
-
-int islower (int c) { return (c >= 'A' && c <= 'z'); }
-
-int isprint (int c) { return (c >= 32 && c <= 126); }
-
-int ispunct (int c) { return isgraph (c) && !isalnum (c); }
-
-int isspace (int c) {
-  return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v');
+int strncmp (const char* s1, const char* s2, size_t n) {
+  while (n && *s1 && (*s1 == *s2)) {
+    ++s1;
+    ++s2;
+    --n;
+  }
+  if (n == 0) {
+    return 0;
+  } else {
+    return (*(unsigned char*)s1 - *(unsigned char*)s2);
+  }
 }
 
-int isupper (int c) { return (c >= 'A' && c <= 'Z'); }
+/* https://stackoverflow.com/questions/49131175/recreate-the-strstr-function */
+char* strstr (const char* str, const char* substring) {
+  const char* a;
+  const char* b;
 
-int isxdigit (int c) { return isdigit (c) || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f'); }
+  b = substring;
 
-int isascii (int c) { return (c >= 0 && c <= 127); }
+  if (*b == 0) {
+    return (char*)str;
+  }
 
-int isblank (int c) { return (c == ' ' || c == '\t'); }
+  for (; *str != 0; str += 1) {
+    if (*str != *b) {
+      continue;
+    }
+
+    a = str;
+    while (1) {
+      if (*b == 0) {
+        return (char*)str;
+      }
+      if (*a++ != *b++) {
+        break;
+      }
+    }
+    b = substring;
+  }
+
+  return NULL;
+}
+
+/* https://github.com/gcc-mirror/gcc/blob/master/libiberty/strchr.c */
+char* strchr (register const char* s, int c) {
+  do {
+    if (*s == c) {
+      return (char*)s;
+    }
+  } while (*s++);
+  return (0);
+}
 
 /* SOURCE: https://aticleworld.com/memmove-function-implementation-in-c/ */
 void* memmove (void* dest, const void* src, unsigned int n) {
@@ -194,3 +220,43 @@ char* strncat (char* dest, const char* src, size_t n) {
   *ptr = '\0';
   return dest;
 }
+
+/* https://stackoverflow.com/questions/14476627/strcpy-implementation-in-c */
+char* strcpy (char* strDest, const char* strSrc) {
+  char* temp = strDest;
+  while ((*strDest++ = *strSrc++))
+    ;
+  return temp;
+}
+
+int isalnum (int c) { return isalpha (c) || isdigit (c); }
+
+int isalpha (int c) { return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); }
+
+int iscntrl (int c) { return (c >= 0 && c <= 32) || (c == 127); }
+
+int isdigit (int c) { return (c >= '0' && c <= '9'); }
+
+int isgraph (int c) { return (c > 32 && c <= 126); }
+
+int islower (int c) { return (c >= 'A' && c <= 'z'); }
+
+int isprint (int c) { return (c >= 32 && c <= 126); }
+
+int ispunct (int c) { return isgraph (c) && !isalnum (c); }
+
+int isspace (int c) {
+  return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v');
+}
+
+int isupper (int c) { return (c >= 'A' && c <= 'Z'); }
+
+int isxdigit (int c) { return isdigit (c) || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f'); }
+
+int isascii (int c) { return (c >= 0 && c <= 127); }
+
+int isblank (int c) { return (c == ' ' || c == '\t'); }
+
+int tolower (int chr) { return (chr >= 'A' && chr <= 'Z') ? (chr + 32) : (chr); }
+
+int toupper (int chr) { return (chr >= 'a' && chr <= 'z') ? (chr - 32) : (chr); }