CE split lines properly

libstring/string.c

@@ -68,6 +68,48 @@ void strtokenize (const char* str, char delim, void* ctx, strtokenize_cb_func_t
   }
 }
 
+void str_split_lines (const char* str, size_t total_len, void* ctx, strtokenize_cb_func_t cb) {
+  if (str == NULL)
+    return;
+
+  const char* start = str;
+  const char* end;
+  size_t remaining = total_len;
+
+  while (remaining > 0) {
+    end = memchr (start, '\n', remaining);
+
+    if (end != NULL) {
+      size_t line_len = (size_t)(end - start);
+
+      if (!cb (ctx, start, line_len))
+        return;
+
+      start = end + 1;
+      remaining = total_len - (size_t)(start - str);
+
+      if (remaining == 0)
+        cb (ctx, start, 0);
+    } else {
+      cb (ctx, start, remaining);
+      break;
+    }
+  }
+}
+
+/* https://svnweb.freebsd.org/base/stable/7/lib/libc/string/memchr.c?view=markup */
+void* memchr (const void* s, unsigned char c, size_t n) {
+  if (n != 0) {
+    const unsigned char* p = s;
+    do {
+      if (*p++ == c)
+        return ((void*)(p - 1));
+    } while (--n != 0);
+  }
+
+  return NULL;
+}
+
 /* https://stackoverflow.com/a/34873406 */
 int strcmp (const char* s1, const char* s2) {
   while (*s1 && (*s1 == *s2)) {

libstring/string.h

@@ -33,6 +33,12 @@ char* strcat (char* dest, const char* src);
 
 char* strncat (char* dest, const char* src, size_t n);
 
+void* memmove (void* dest, const void* src, unsigned int n);
+
+void* memchr (const void* s, unsigned char c, size_t n);
+
+void str_split_lines (const char* str, size_t total_len, void* ctx, strtokenize_cb_func_t cb);
+
 int isalnum (int c);
 
 int isalpha (int c);
@@ -59,6 +65,4 @@ int isascii (int c);
 
 int isblank (int c);
 
-void* memmove (void* dest, const void* src, unsigned int n);
-
 #endif // _LIBSTRING_STRING_H