1 files changed, 128 insertions, 0 deletions
diff --git a/lib/unicase/u8-tolower.c b/lib/unicase/u8-tolower.c
new file mode 100644
index 0000000..63459fc
--- /dev/null
+++ b/lib/unicase/u8-tolower.c
@@ -0,0 +1,128 @@
+/* Lowercase mapping for UTF-8 strings (locale dependent).
+   Copyright (C) 2009-2022 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This file is free software.
+   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
+   You can redistribute it and/or modify it under either
+     - the terms of the GNU Lesser General Public License as published
+       by the Free Software Foundation, either version 3, or (at your
+       option) any later version, or
+     - the terms of the GNU General Public License as published by the
+       Free Software Foundation; either version 2, or (at your option)
+       any later version, or
+     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License and the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License and of the GNU General Public License along with this
+   program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unicase.h"
+
+#include <stddef.h>
+
+#include "unicase/unicasemap.h"
+#include "unicase/special-casing.h"
+
+uint8_t *
+u8_tolower (const uint8_t *s, size_t n, const char *iso639_language,
+            uninorm_t nf,
+            uint8_t *resultbuf, size_t *lengthp)
+{
+  return u8_casemap (s, n,
+                     unicase_empty_prefix_context, unicase_empty_suffix_context,
+                     iso639_language,
+                     uc_tolower, offsetof (struct special_casing_rule, lower[0]),
+                     nf,
+                     resultbuf, lengthp);
+}
+
+
+#ifdef TEST
+
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Read the contents of an input stream, and return it, terminated with a NUL
+   byte. */
+char *
+read_file (FILE *stream)
+{
+#define BUFSIZE 4096
+  char *buf = NULL;
+  int alloc = 0;
+  int size = 0;
+  int count;
+
+  while (! feof (stream))
+    {
+      if (size + BUFSIZE > alloc)
+        {
+          alloc = alloc + alloc / 2;
+          if (alloc < size + BUFSIZE)
+            alloc = size + BUFSIZE;
+          buf = realloc (buf, alloc);
+          if (buf == NULL)
+            {
+              fprintf (stderr, "out of memory\n");
+              exit (1);
+            }
+        }
+      count = fread (buf + size, 1, BUFSIZE, stream);
+      if (count == 0)
+        {
+          if (ferror (stream))
+            {
+              perror ("fread");
+              exit (1);
+            }
+        }
+      else
+        size += count;
+    }
+  buf = realloc (buf, size + 1);
+  if (buf == NULL)
+    {
+      fprintf (stderr, "out of memory\n");
+      exit (1);
+    }
+  buf[size] = '\0';
+  return buf;
+#undef BUFSIZE
+}
+
+int
+main (int argc, char * argv[])
+{
+  setlocale (LC_ALL, "");
+  if (argc == 1)
+    {
+      /* Display the lower case of the input string.  */
+      char *input = read_file (stdin);
+      int length = strlen (input);
+      size_t output_length;
+      uint8_t *output =
+        u8_tolower ((uint8_t *) input, length, uc_locale_language (),
+                    NULL,
+                    NULL, &output_length);
+
+      fwrite (output, 1, output_length, stdout);
+
+      return 0;
+    }
+  else
+    return 1;
+}
+
+#endif /* TEST */