7 files changed, 455 insertions, 2 deletions

diff --git a/src/regress/lib/libc/stdio/Makefile b/src/regress/lib/libc/stdio/Makefile
index ee865013dd..3f2c2bab8e 100644
--- a/src/regress/lib/libc/stdio/Makefile
+++ b/src/regress/lib/libc/stdio/Makefile
@@ -1,8 +1,26 @@
-# $OpenBSD: Makefile,v 1.1 2025/05/24 11:07:20 yasuoka Exp $
+# $OpenBSD: Makefile,v 1.2 2025/05/25 00:20:54 yasuoka Exp $
 
 PROGS=          test_fflush
-
 CLEANFILES=     test_fflush.tmp
+
+PROGS+=         test___freading
+CLEANFILES+=    test___freading.tmp
+
+PROGS+=         test___fwriting
+CLEANFILES+=    test___fwriting.tmp
+
+PROGS+=         test___fpending
+CLEANFILES+=    test___fpending.tmp
+
+PROGS+=         test___freadahead
+CLEANFILES+=    test___freadahead.tmp
+
+PROGS+=         test___freadptr
+CLEANFILES+=    test___freadptr.tmp
+
+PROGS+=         test___fseterr
+CLEANFILES+=    test___fseterr.tmp
+
 WARNINGS=       yes
 
 # until fflush comply POSIX-2008
diff --git a/src/regress/lib/libc/stdio/test___fpending.c b/src/regress/lib/libc/stdio/test___fpending.c
new file mode 100644
index 0000000000..96ace2e481
--- /dev/null
+++ b/src/regress/lib/libc/stdio/test___fpending.c
@@ -0,0 +1,58 @@
+/*      $OpenBSD: test___fpending.c,v 1.1 2025/05/25 00:20:54 yasuoka Exp $     */
+
+/*
+ * Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+
+/* we use assert() */
+#undef  NDEBUG
+
+#define TMPFILENAME     "test___fpending.tmp"
+
+void test___fpending0(void);
+
+void
+test___fpending0(void)
+{
+        FILE    *fp;
+        int      r;
+        size_t   s;
+
+        fp = fopen(TMPFILENAME, "w");
+        assert(fp != NULL);
+        r = fputs("Hello world", fp);
+        assert(r >= 0);
+        s = __fpending(fp);
+        assert(s > 0);          /* assume buffered */
+        r = fflush(fp);
+        assert(r == 0);
+        s = __fpending(fp);
+        assert(s == 0);         /* buffer must be 0 */
+        r = fclose(fp);
+        assert(r == 0);
+}
+
+int
+main(int argc, char *argv[])
+{
+        test___fpending0();
+
+        exit(0);
+}
diff --git a/src/regress/lib/libc/stdio/test___freadahead.c b/src/regress/lib/libc/stdio/test___freadahead.c
new file mode 100644
index 0000000000..c853e23975
--- /dev/null
+++ b/src/regress/lib/libc/stdio/test___freadahead.c
@@ -0,0 +1,71 @@
+/*      $OpenBSD: test___freadahead.c,v 1.1 2025/05/25 00:20:54 yasuoka Exp $   */
+
+/*
+ * Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+
+/* we use assert() */
+#undef  NDEBUG
+
+#define TMPFILENAME     "test___freadahead.tmp"
+
+void test___freadahead0(void);
+
+void
+test___freadahead0(void)
+{
+        FILE    *fp;
+        int      r;
+        size_t   s;
+
+        fp = fopen(TMPFILENAME, "w");
+        assert(fp != NULL);
+        r = fputs("Hello world", fp);
+        assert(r >= 0);
+        r = fclose(fp);
+
+        fp = fopen(TMPFILENAME, "r");
+        s = __freadahead(fp);
+        assert(s == 0);
+        assert(fgetc(fp) == 'H');
+        s = __freadahead(fp);
+        assert(s == 10);
+        r = fflush(fp);
+#if 1
+        /* fflush() to reading file is not supported (yet) */
+        assert(errno == EBADF);
+#else
+        assert(r == 0);
+        s = __freadahead(fp);
+        assert(s == 0);
+#endif
+
+        r = fclose(fp);
+        assert(r == 0);
+}
+
+int
+main(int argc, char *argv[])
+{
+        test___freadahead0();
+
+        exit(0);
+}
diff --git a/src/regress/lib/libc/stdio/test___freading.c b/src/regress/lib/libc/stdio/test___freading.c
new file mode 100644
index 0000000000..05716f3a38
--- /dev/null
+++ b/src/regress/lib/libc/stdio/test___freading.c
@@ -0,0 +1,85 @@
+/*      $OpenBSD: test___freading.c,v 1.1 2025/05/25 00:20:54 yasuoka Exp $     */
+
+/*
+ * Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* we use assert() */
+#undef  NDEBUG
+
+#define TMPFILENAME     "test___freading.tmp"
+
+void test___freading0(void);
+void test___freading1(void);
+
+void
+test___freading0(void)
+{
+        FILE    *fp;
+        int      r;
+        char     buf[80];
+
+        fp = popen("echo Hello world", "r");
+        assert(fp != NULL);
+        assert(__freading(fp) != 0);
+        assert(fgets(buf, sizeof(buf), fp) != NULL);
+        assert(strcmp(buf, "Hello world\n") == 0);
+        r = pclose(fp);
+        assert(r == 0);
+}
+
+void
+test___freading1(void)
+{
+        FILE    *fp;
+        int      r;
+
+        /* when the last operaiton is read, __freading() returns true */
+        fp = fopen(TMPFILENAME, "w+");
+        assert(fp != NULL);
+        assert(__freading(fp) == 0);
+        r = fputs("Hello world\n", fp);
+        assert(r >= 0);
+        assert(__freading(fp) == 0);
+        rewind(fp);
+        assert(fgetc(fp) == 'H');
+        assert(__freading(fp) != 0);
+        /* write */
+        fseek(fp, 0, SEEK_END);
+        r = fputs("\n", fp);
+        assert(__freading(fp) == 0);
+        /* ungetc */
+        rewind(fp);
+        assert(ungetc('X', fp) != 0);
+        assert(__freading(fp) != 0);    /* reading */
+
+        r = fclose(fp);
+        assert(r == 0);
+}
+
+int
+main(int argc, char *argv[])
+{
+        test___freading0();
+        test___freading1();
+
+        exit(0);
+}
diff --git a/src/regress/lib/libc/stdio/test___freadptr.c b/src/regress/lib/libc/stdio/test___freadptr.c
new file mode 100644
index 0000000000..cce362f2ae
--- /dev/null
+++ b/src/regress/lib/libc/stdio/test___freadptr.c
@@ -0,0 +1,78 @@
+/*      $OpenBSD: test___freadptr.c,v 1.1 2025/05/25 00:20:54 yasuoka Exp $     */
+
+/*
+ * Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* we use assert() */
+#undef  NDEBUG
+
+#define TMPFILENAME     "test___freadptr.tmp"
+
+void test___freadptr0(void);
+
+/* test __freadptr() and __freadptrinc() */
+void
+test___freadptr0(void)
+{
+        FILE            *fp;
+        int              r;
+        ssize_t          s;
+        const char      *p;
+
+        fp = fopen(TMPFILENAME, "w");
+        assert(fp != NULL);
+        r = fputs("Hello world", fp);
+        assert(r >= 0);
+        r = fclose(fp);
+
+        fp = fopen(TMPFILENAME, "r");
+        assert(fgetc(fp) == 'H');
+        p = __freadptr(fp, &s);
+        assert(p != NULL);
+        assert(s > 4);          /* this test assume this (not by the spec) */
+        assert(*p == 'e');
+        assert(strncmp(p, "ello world", s) == 0);
+
+        __freadptrinc(fp, 4);
+        assert(fgetc(fp) == ' ');
+
+        ungetc('A', fp);
+        ungetc('A', fp);
+        ungetc('A', fp);
+        p = __freadptr(fp, &s);
+        assert(s > 0);
+        assert(*p == 'A');
+        /* ptr will contains only the pushback buffer */
+        assert(strncmp(p, "AAAworld", s) == 0);
+
+        r = fclose(fp);
+        assert(r == 0);
+}
+
+int
+main(int argc, char *argv[])
+{
+        test___freadptr0();
+
+        exit(0);
+}
diff --git a/src/regress/lib/libc/stdio/test___fseterr.c b/src/regress/lib/libc/stdio/test___fseterr.c
new file mode 100644
index 0000000000..70fb491c6c
--- /dev/null
+++ b/src/regress/lib/libc/stdio/test___fseterr.c
@@ -0,0 +1,60 @@
+/*      $OpenBSD: test___fseterr.c,v 1.1 2025/05/25 00:20:54 yasuoka Exp $      */
+
+/*
+ * Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+
+/* we use assert() */
+#undef  NDEBUG
+
+#define TMPFILENAME     "test___fseterr.tmp"
+
+void test___fseterr0(void);
+
+void
+test___fseterr0(void)
+{
+        FILE    *fp;
+        int      r;
+
+        fp = fopen(TMPFILENAME, "w+");
+        assert(fp != NULL);
+
+        assert(!ferror(fp));
+
+        r = fprintf(fp, "hello world\n");
+        assert(r > 0);
+
+        __fseterr(fp);
+        assert(ferror(fp));
+
+        r = fprintf(fp, "hello world\n");
+        assert(r == -1);
+
+        fclose(fp);
+}
+
+int
+main(int argc, char *argv[])
+{
+        test___fseterr0();
+
+        exit(0);
+}
diff --git a/src/regress/lib/libc/stdio/test___fwriting.c b/src/regress/lib/libc/stdio/test___fwriting.c
new file mode 100644
index 0000000000..eb4671d3cf
--- /dev/null
+++ b/src/regress/lib/libc/stdio/test___fwriting.c
@@ -0,0 +1,83 @@
+/*      $OpenBSD: test___fwriting.c,v 1.1 2025/05/25 00:20:54 yasuoka Exp $     */
+
+/*
+ * Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+
+/* we use assert() */
+#undef  NDEBUG
+
+#define TMPFILENAME     "test___fwriting.tmp"
+
+void test___fwriting0(void);
+void test___fwriting1(void);
+
+void
+test___fwriting0(void)
+{
+        FILE    *fp;
+        int      r;
+
+        fp = fopen(TMPFILENAME, "w");   /* write only */
+        assert(fp != NULL);
+        assert(__fwriting(fp) != 0);    /* writing is true immediately */
+        r = fputs("Hello world\n", fp);
+        assert(r >= 0);
+        r = fclose(fp);
+        assert(r == 0);
+
+        fp = fopen(TMPFILENAME, "a");   /* append only */
+        assert(fp != NULL);
+        assert(__fwriting(fp) != 0);    /* writing immediately */
+        r = fclose(fp);
+        assert(r == 0);
+}
+
+void
+test___fwriting1(void)
+{
+        FILE    *fp;
+        int      r;
+
+        fp = fopen(TMPFILENAME, "w+");  /* read / write */
+        assert(fp != NULL);
+        r = fputs("Hello world\n", fp);
+        assert(r >= 0);
+        assert(__fwriting(fp) != 0);
+        rewind(fp);
+        assert(fgetc(fp) == 'H');       /* read */
+        assert(__fwriting(fp) == 0);    /* writing becomes false */
+        fputc('e', fp);
+        assert(__fwriting(fp) != 0);    /* writing becomes true */
+        ungetc('e', fp);
+        assert(__fwriting(fp) == 0);    /* ungetc -> writing becomes false */
+
+        r = fclose(fp);
+        assert(r == 0);
+}
+
+int
+main(int argc, char *argv[])
+{
+        test___fwriting0();
+        test___fwriting1();
+
+        exit(0);
+}