1 files changed, 147 insertions, 0 deletions
diff --git a/gnulib-tests/test-mbsalign.c b/gnulib-tests/test-mbsalign.c
new file mode 100644
index 0000000..151dbef
--- /dev/null
+++ b/gnulib-tests/test-mbsalign.c
@@ -0,0 +1,147 @@
+/* Test that mbsalign works as advertised.
+   Copyright (C) 2010-2023 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Pádraig Brady.  */
+
+#include <config.h>
+
+#include "mbsalign.h"
+#include "macros.h"
+#include <stdlib.h>
+#include <locale.h>
+
+int
+main (void)
+{
+  char dest[4 * 16 + 1];
+  size_t width, n;
+
+#ifdef __ANDROID__
+  /* On Android ≥ 5.0, the default locale is the "C.UTF-8" locale, not the
+     "C" locale.  Furthermore, when you attempt to set the "C" or "POSIX"
+     locale via setlocale(), what you get is a "C" locale with UTF-8 encoding,
+     that is, effectively the "C.UTF-8" locale.  */
+  if (MB_CUR_MAX == 1)
+#endif
+    {
+      /* Test unibyte truncation.  */
+      width = 4;
+      n = mbsalign ("t\tés", dest, sizeof dest, &width, MBS_ALIGN_LEFT, 0);
+      ASSERT (n == 4);
+    }
+
+  /* Test center alignment.  */
+  width = 4;
+  n = mbsalign ("es", dest, sizeof dest, &width, MBS_ALIGN_CENTER, 0);
+  ASSERT (*dest == ' ' && *(dest + n - 1) == ' ');
+  ASSERT (n == 4);
+
+  /* Test center alignment, with no trailing padding.  */
+  width = 4;
+  n = mbsalign ("es", dest, sizeof dest, &width, MBS_ALIGN_CENTER,
+                MBA_NO_RIGHT_PAD);
+  ASSERT (n == 3);
+  ASSERT (*dest == ' ' && *(dest + n - 1) == 's');
+
+  /* Test left alignment, with no trailing padding. (truncate only).  */
+  width = 4;
+  n = mbsalign ("es", dest, sizeof dest, &width, MBS_ALIGN_LEFT,
+                MBA_NO_RIGHT_PAD);
+  ASSERT (n == 2);
+  ASSERT (*dest == 'e' && *(dest + n - 1) == 's');
+
+  /* Test center alignment, with no padding. (truncate only).  */
+  width = 4;
+  n = mbsalign ("es", dest, sizeof dest, &width, MBS_ALIGN_CENTER,
+                MBA_NO_LEFT_PAD | MBA_NO_RIGHT_PAD);
+  ASSERT (n == 2);
+  ASSERT (*dest == 'e' && *(dest + n - 1) == 's');
+
+  /* Test center alignment, with no left padding. (may be useful for RTL?)  */
+  width = 4;
+  n = mbsalign ("es", dest, sizeof dest, &width, MBS_ALIGN_CENTER,
+                MBA_NO_LEFT_PAD);
+  ASSERT (n == 3);
+  ASSERT (*dest == 'e' && *(dest + n - 1) == ' ');
+
+  if (setlocale (LC_ALL, "en_US.UTF8"))
+    {
+      /* Check invalid input is flagged.  */
+      width = 4;
+      n = mbsalign ("t\xe1\xe2s", dest, sizeof dest, &width, MBS_ALIGN_LEFT, 0);
+      ASSERT (n == (size_t) -1);
+
+      /* Check invalid input is treated as unibyte  */
+      width = 4;
+      n = mbsalign ("t\xe1\xe2s", dest, sizeof dest, &width,
+                    MBS_ALIGN_LEFT, MBA_UNIBYTE_FALLBACK);
+      ASSERT (n == 4);
+
+      /* Test multibyte center alignment.  */
+      width = 4;
+      n = mbsalign ("és", dest, sizeof dest, &width, MBS_ALIGN_CENTER, 0);
+      ASSERT (n == 5);
+      ASSERT (*dest == ' ' && *(dest + n - 1) == ' ');
+
+      /* Test multibyte left alignment.  */
+      width = 4;
+      n = mbsalign ("és", dest, sizeof dest, &width, MBS_ALIGN_LEFT, 0);
+      ASSERT (n == 5);
+      ASSERT (*(dest + n - 1) == ' ' && *(dest + n - 2) == ' ');
+
+      /* Test multibyte right alignment.  */
+      width = 4;
+      n = mbsalign ("és", dest, sizeof dest, &width, MBS_ALIGN_RIGHT, 0);
+      ASSERT (n == 5);
+      ASSERT (*(dest) == ' ' && *(dest + 1) == ' ');
+
+      /* multibyte multicell truncation.  */
+      width = 4;                /* cells */
+      n = mbsalign ("日月火水", dest, sizeof dest, &width,
+                    MBS_ALIGN_LEFT, 0);
+      ASSERT (n == 6);          /* 2 characters */
+
+      /* multibyte unicell truncation.  */
+      width = 3;                /* cells */
+      n = mbsalign ("¹²³⁴", dest, sizeof dest, &width, MBS_ALIGN_LEFT, 0);
+      ASSERT (n == 6);          /* 3 characters */
+
+      /* Check independence from dest buffer. */
+      width = 4;                /* cells */
+      n = mbsalign ("¹²³⁴", dest, 0, &width, MBS_ALIGN_LEFT, 0);
+      ASSERT (n == 9);          /* 4 characters */
+
+      /* Check that width is updated with cells required before padding.  */
+      width = 4;                /* cells */
+      n = mbsalign ("¹²³", dest, 0, &width, MBS_ALIGN_LEFT, 0);
+      ASSERT (width == 3);
+
+      /* Test case where output is larger than input
+         (as tab converted to multi byte replacement char).  */
+      width = 4;
+      n = mbsalign ("t\tés" /* 6 including NUL */ , dest, sizeof dest,
+                    &width, MBS_ALIGN_LEFT, 0);
+      ASSERT (n == 7);
+
+      /* Test forced unibyte truncation.  */
+      width = 4;
+      n = mbsalign ("t\tés", dest, sizeof dest, &width, MBS_ALIGN_LEFT,
+                    MBA_UNIBYTE_ONLY);
+      ASSERT (n == 4);
+    }
+
+  return 0;
+}