[ADD/WIP] Start making string splitters

I want to go on an encore of XEP-0393, with _rectangles_ as boundaries,
this time.

src/StrSplit.c

@@ -0,0 +1,65 @@
+#include <StringSplit.h>
+
+#include <Cytoplasm/Memory.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+
+char **
+StrSplitLines(char *text)
+{
+    char **ret = NULL;
+    size_t lines = 0;
+
+    char *next = text, *ptr = text;
+    bool done = false;
+    if (!text)
+    {
+        return NULL;
+    }
+
+    while (!done)
+    {
+        size_t bytes;
+        char *line;
+
+        next = strchr(ptr, '\n');
+        if (!next)
+        {
+            next = text + strlen(text);
+            done = true;
+        }
+
+        /* Take the chunk from ptr to [text] */
+        bytes = next - ptr;
+        line = Malloc(bytes + 1);
+        memcpy(line, ptr, bytes);
+        line[bytes] = '\0';
+
+        ret = Realloc(ret, sizeof(char *) * ++lines);
+        ret[lines - 1] = line;
+
+        ptr = *next ? next + 1 : next;
+    }
+
+    ret = Realloc(ret, sizeof(char *) * ++lines);
+    ret[lines - 1] = NULL;
+    return ret;
+}
+void
+StrFreeLines(char **split)
+{
+    char *line, **orig;
+    if (!split)
+    {
+        return;
+    }
+
+    orig = split;
+    while ((line = *split++))
+    {
+        Free(line);
+    }
+
+    Free(orig);
+}

src/include/Parsee.h

@@ -231,6 +231,9 @@ extern bool ParseeIsAdmin(ParseeData *data, char *user);
 /* Measures Parsee's overall uptime */
 extern uint64_t ParseeUptime(void);
 
-/* Turns a date into a nice "X minutes, Y seconds" string */
+/** Turns a duration into a nice "X minutes, Y seconds" string
+ * ---------
+ * Returns: A human-readable string showing the duration[LA:HEAP]
+ * Modifies: NOTHING */
 extern char * ParseeStringifyDate(uint64_t millis);
 #endif

src/include/StringSplit.h

@@ -0,0 +1,35 @@
+#ifndef PARSEE_STRINGSPLIT_H
+#define PARSEE_STRINGSPLIT_H
+
+#include <stdlib.h>
+
+/* Represents a boundary in a linesplit string */
+typedef struct StringRect {
+    char **source_lines;
+
+    /* NOTE: All of these values are inclusive */
+
+    /* The start line/character index */
+    size_t start_line;
+    size_t start_char;
+
+    /* The end line/character index */
+    size_t end_line;
+    size_t end_char;
+} StringRect;
+
+/** Splits a string into a set of NULL-terminated substrings, which is 
+ * terminated by a NULL pointer.
+ * ---------
+ * Returns: A set of lines(excluding them) [LA:HEAP]
+ * Modifies: NOTHING
+ * Thrasher: StrFreeLines */
+extern char ** StrSplitLines(char *text);
+extern void StrFreeLines(char **split);
+
+extern size_t StrLines(char **split);
+
+/* Creates a full zone covering every part of the split */
+extern StringRect StrFullRect(char **split);
+
+#endif