vsnprintf-gnu: Add tests.

* tests/test-vsnprintf-gnu.c: New file, based on
tests/test-vsnprintf-posix.c.
* tests/test-snprintf-gnu.h: New file, based on
tests/test-vasnprintf-gnu.c.
* modules/vsnprintf-gnu-tests: New file, based on
modules/vsnprintf-posix-tests.

2 files changed, 223 insertions, 0 deletions

diff --git a/tests/test-snprintf-gnu.h b/tests/test-snprintf-gnu.h
new file mode 100644
index 0000000000..eda2c80334
--- /dev/null
+++ b/tests/test-snprintf-gnu.h
@@ -0,0 +1,175 @@
+/* Test of POSIX and GNU compatible vsnprintf() and snprintf() functions.
+   Copyright (C) 2007-2023 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 Bruno Haible <bruno@clisp.org>, 2023.  */
+
+static void
+test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
+{
+  char result[5000];
+
+  /* Test the support of the 'B' conversion specifier for binary output of
+     integers.  */
+
+  { /* Zero.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%B %d", 0, 33, 44, 55);
+    ASSERT (strcmp (result, "0 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* A positive number.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "11000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* A large positive number.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%B %d", 0xFFFFFFFEU, 33, 44, 55);
+    ASSERT (strcmp (result, "11111111111111111111111111111110 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Width.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "      11000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Width given as argument.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%*B %d", 20, 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "      11000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Negative width given as argument (cf. FLAG_LEFT below).  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%*B %d", -20, 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "11000000111001       33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Precision.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%.20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "00000011000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Zero precision and a positive number.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%.0B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "11000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Zero precision and a zero number.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%.0B %d", 0, 33, 44, 55);
+    /* ISO C and POSIX specify that "The result of converting a zero value
+       with a precision of zero is no characters."  */
+    ASSERT (strcmp (result, " 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Width and precision.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%25.20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "     00000011000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* Padding and precision.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%025.20B %d", 12345, 33, 44, 55);
+    /* Neither ISO C nor POSIX specify that the '0' flag is ignored when
+       a width and a precision are both present.  But implementations do so.  */
+    ASSERT (strcmp (result, "     00000011000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_LEFT.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%-20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "11000000111001       33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with zero.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%#B %d", 0, 33, 44, 55);
+    ASSERT (strcmp (result, "0 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with a positive number.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%#B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "0B11000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with a positive number and width.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%#20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "    0B11000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with a positive number and padding.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%0#20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "0B000011000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with a positive number and precision.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%0#.20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "0B00000011000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with a positive number and width and precision.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%#25.20B %d", 12345, 33, 44, 55);
+    ASSERT (strcmp (result, "   0B00000011000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with a positive number and padding and precision.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%0#25.20B %d", 12345, 33, 44, 55);
+    /* Neither ISO C nor POSIX specify that the '0' flag is ignored when
+       a width and a precision are both present.  But implementations do so.  */
+    ASSERT (strcmp (result, "   0B00000011000000111001 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+
+  { /* FLAG_ALT with a zero precision and a zero number.  */
+    int retval =
+      my_snprintf (result, sizeof (result), "%#.0B %d", 0, 33, 44, 55);
+    /* ISO C and POSIX specify that "The result of converting a zero value
+       with a precision of zero is no characters.", and the prefix is added
+       only for non-zero values.  */
+    ASSERT (strcmp (result, " 33") == 0);
+    ASSERT (retval == strlen (result));
+  }
+}
diff --git a/tests/test-vsnprintf-gnu.c b/tests/test-vsnprintf-gnu.c
new file mode 100644
index 0000000000..420930f7d0
--- /dev/null
+++ b/tests/test-vsnprintf-gnu.c
@@ -0,0 +1,48 @@
+/* Test of POSIX and GNU compatible vsnprintf() function.
+   Copyright (C) 2007-2023 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 Bruno Haible <bruno@clisp.org>, 2007.  */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "macros.h"
+
+#include "test-snprintf-gnu.h"
+
+static int
+my_snprintf (char *str, size_t size, const char *format, ...)
+{
+  va_list args;
+  int ret;
+
+  va_start (args, format);
+  ret = vsnprintf (str, size, format, args);
+  va_end (args);
+  return ret;
+}
+
+int
+main (int argc, char *argv[])
+{
+  test_function (my_snprintf);
+  return 0;
+}