Wrapper helper (#1799)

* [WRAPPERHELPER] Added wrapperhelper v0.1, tested on libc

* [WRAPPED] Removed updates to libc from this branch

* [WRAPPERHELPER] Removed GPL header and added modified LGPL header, added notes about licensing issues

1 files changed, 78 insertions, 0 deletions

diff --git a/wrapperhelper/src/cstring.h b/wrapperhelper/src/cstring.h
new file mode 100644
index 00000000..14032bd6
--- /dev/null
+++ b/wrapperhelper/src/cstring.h
@@ -0,0 +1,78 @@
+#pragma once
+
+#ifndef STRING_H
+#define STRING_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+/** Thread-unsafe string implementation, with support for raw NULL bytes
+ * USAGE:
+ * ======
+ * string_t ------------ The string type.
+ * string_new ---------- Creates a new string.
+ * string_new_cap ------ Creates a new string with a given capacity. Takes the capacity.
+ * string_reserve ------ Ensures a string has at least a given capacity. Takes the string and the capacity.
+ * string_del ---------- Frees a string. Takes the string.
+ * string_steal -------- Frees a string, keeping the content alive. Takes the string. The content (also returned) needs to be freed separately.
+ * string_add_char ----- Add a character at the end. Takes the string and the new character. May increase the string capacity.
+ * string_add_string --- Add a string at the end in-place. Takes both strings. May increase the string capacity.
+ * string_pop ---------- Pops the last character. Takes the string. May reduce the string capacity.
+ * string_dup ---------- Duplicate a string. Takes the string. Does not free the old string.
+ * string_concat ------- Concatenate two strings. Takes both strings. Does not free any string.
+ * string_len ---------- String length. Takes the string.
+ * string_cap ---------- String capacity. Takes the string.
+ * string_content ------ Pointer to the string content. Valid C string. Takes the string.
+ * string_begin -------- Start of the string. Takes the string.
+ * string_end ---------- End of the string. Points to unmanaged memory. Takes the string.
+ * string_last --------- Last element of the string. Points to invalid memory if size is zero. Takes the string.
+ * string_for ---------- Iterate over the characters of a string. This is a for loop. Takes the iterator name and the string.
+ * 
+ * EXAMPLE:
+ * ========
+ * Source main.c:
+ * -------------------
+// ...
+int main() {
+	string_t *str = string_new_cap(2);
+	if (!str) {
+		printf("Error: failed to allocate new string\n");
+		return 2;
+	}
+	string_add_char(str, 'H'); // Cannot fail
+	string_add_char(str, 'i'); // Cannot fail
+	if (!string_add_char(str, '!')) {
+		printf("Error: failed to add char to string\n");
+		return 2;
+	}
+	printf("String length: %zu: \"%s\"\n", string_len(str), string_content(str)); // 3, "Hi!"
+	string_del(str);
+}
+ */
+
+typedef struct string_s {
+	size_t ssize, scap;
+	char *buf;
+} string_t;
+
+string_t *string_new(void);
+string_t *string_new_cap(size_t cap);
+int       string_reserve(string_t *s, size_t cap);
+void      string_del(string_t *s);
+char     *string_steal(string_t *s);
+int       string_add_char(string_t *s, char elem);
+int       string_add_string(string_t *s1, string_t *s2);
+void      string_pop(string_t *s);
+string_t *string_dup(string_t const *s);
+string_t *string_concat(string_t const *l, string_t const *r);
+#define string_len(s) ((s)->ssize)
+#define string_cap(s) ((s)->scap)
+#define string_content(s) ((s)->buf)
+#define string_begin(s) ((s)->buf)
+#define string_end(s) ((s)->buf + (s)->ssize)
+#define string_last(s) ((s)->buf[(s)->ssize - 1])
+#define string_for(itname, s) \
+	for (char *itname = string_begin((s)); itname != string_end((s)); ++itname)
+
+#endif // STRING_H