datagen generates lorem ipsum by default

tests/loremOut.c

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+/* Implementation notes:
+ * Generates a stream of Lorem ipsum paragraphs to stdout,
+ * up to the requested size, which can be very large (> 4 GB).
+ * Note that, beyond 1 paragraph, this generator produces
+ * a different content than LOREM_genBuffer (even when using same seed).
+ */
+
+#include "loremOut.h"
+#include <assert.h>
+#include <stdio.h>
+#include "lorem.h"    /* LOREM_genBlock */
+#include "platform.h" /* Compiler options, SET_BINARY_MODE */
+
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define LOREM_BLOCKSIZE (1 << 10)
+void LOREM_genOut(unsigned long long size, unsigned seed)
+{
+    char buff[LOREM_BLOCKSIZE] = { 0 };
+    unsigned long long total   = 0;
+    size_t genBlockSize        = (size_t)MIN(size, LOREM_BLOCKSIZE);
+
+    /* init */
+    SET_BINARY_MODE(stdout);
+
+    /* Generate Ipsum text, one paragraph at a time */
+    while (total < size) {
+        size_t generated =
+                LOREM_genBlock(buff, genBlockSize, seed++, total == 0, 0);
+        assert(generated <= genBlockSize);
+        total += generated;
+        assert(total <= size);
+        fwrite(buff,
+               1,
+               generated,
+               stdout); /* note: should check potential write error */
+        if (size - total < genBlockSize)
+            genBlockSize = (size_t)(size - total);
+    }
+    assert(total == size);
+}