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-rw-r--r--lib/unicase/u8-tolower.c128
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diff --git a/lib/unicase/u8-tolower.c b/lib/unicase/u8-tolower.c
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+/* 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 */