New module 'unicase/u8-tolower'.

[gnulib.git] / lib / unicase / u8-tolower.c

diff --git a/lib/unicase/u8-tolower.c b/lib/unicase/u8-tolower.c
new file mode 100644 (file)
index 0000000..8f8790b
--- /dev/null
+++ b/lib/unicase/u8-tolower.c
@@ -0,0 +1,118 @@
+/* Lowercase mapping for UTF-8 strings (locale dependent).
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unicase.h"
+
+#include <stddef.h>
+
+#include "unicasemap.h"
+#include "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, 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 */