Add wide version of open_memstream regress.

3 files changed, 196 insertions, 2 deletions

diff --git a/src/regress/lib/libc/Makefile b/src/regress/lib/libc/Makefile
index 7a8db225ef..7012e12310 100644
--- a/src/regress/lib/libc/Makefile
+++ b/src/regress/lib/libc/Makefile
@@ -1,4 +1,4 @@
-#       $OpenBSD: Makefile,v 1.62 2025/08/04 06:10:40 tb Exp $
+#       $OpenBSD: Makefile,v 1.63 2026/05/08 14:37:16 millert Exp $
 
 SUBDIR+= _setjmp
 SUBDIR+= alloca arc4random-fork atexit
@@ -15,7 +15,7 @@ SUBDIR+= ieeefp ifnameindex illumos
 SUBDIR+= ldexp locale longjmp
 SUBDIR+= malloc mkstemp modf
 SUBDIR+= netdb
-SUBDIR+= open_memstream orientation
+SUBDIR+= open_memstream orientation open_wmemstream
 SUBDIR+= popen printf
 SUBDIR+= qsort
 SUBDIR+= regex
diff --git a/src/regress/lib/libc/open_wmemstream/Makefile b/src/regress/lib/libc/open_wmemstream/Makefile
new file mode 100644
index 0000000000..232bc4a176
--- /dev/null
+++ b/src/regress/lib/libc/open_wmemstream/Makefile
@@ -0,0 +1,5 @@
+#       $OpenBSD: Makefile,v 1.1 2026/05/08 14:37:16 millert Exp $
+
+PROG=   open_wmemstreamtest
+
+.include <bsd.regress.mk>
diff --git a/src/regress/lib/libc/open_wmemstream/open_wmemstreamtest.c b/src/regress/lib/libc/open_wmemstream/open_wmemstreamtest.c
new file mode 100644
index 0000000000..fa2a17d33c
--- /dev/null
+++ b/src/regress/lib/libc/open_wmemstream/open_wmemstreamtest.c
@@ -0,0 +1,189 @@
+/*      $OpenBSD: open_wmemstreamtest.c,v 1.1 2026/05/08 14:37:16 millert Exp $ */
+
+/*
+ * Copyright (c) 2011 Martin Pieuchot <mpi@openbsd.org>
+ *
+ * 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 <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#include <unistd.h>
+
+#define OFFSET 16384
+
+const wchar_t start[] = { 's', 't', 'a', 'r', 't', 0 };
+const wchar_t hello[] = { 'h', 'e', 'l', 'l', 'o', 0 };
+
+int
+main(void)
+{
+        FILE    *fp;
+        wchar_t *buf = (wchar_t *)0xff;
+        size_t   size = 0;
+        off_t    off;
+        int      i, failures = 0;
+
+        if ((fp = open_wmemstream(&buf, &size)) == NULL) {
+                warn("open_wmemstream failed");
+                return (1);
+        }
+
+        off = ftello(fp);
+        if (off != 0) {
+                warnx("ftello failed. (1)");
+                failures++;
+        }
+
+        if (fflush(fp) != 0) {
+                warnx("fflush failed. (2)");
+                failures++;
+        }
+
+        if (size != 0) {
+                warnx("string should be empty. (3)");
+                failures++;
+        }
+
+        if (buf == (wchar_t *)0xff) {
+                warnx("buf not updated. (4)");
+                failures++;
+        }
+
+        if (fseek(fp, OFFSET, SEEK_SET) != 0) {
+                warnx("failed to fseek. (5)");
+                failures++;
+        }
+
+        if (fwprintf(fp, hello) == EOF) {
+                warnx("fwprintf failed. (6)");
+                failures++;
+        }
+
+        if (fflush(fp) == EOF) {
+                warnx("fflush failed. (7)");
+                failures++;
+        }
+
+        if (size != OFFSET + wcslen(hello)) {
+                warnx("failed, size %zu should be %zu. (8)",
+                    size, OFFSET + wcslen(hello));
+                failures++;
+        }
+
+        if (fseek(fp, 0, SEEK_SET) != 0) {
+                warnx("failed to fseek. (9)");
+                failures++;
+        }
+
+        if (fwprintf(fp, start) == EOF) {
+                warnx("fwprintf failed. (10)");
+                failures++;
+        }
+
+        if (fflush(fp) == EOF) {
+                warnx("fflush failed. (11)");
+                failures++;
+        }
+
+        if (size != wcslen(start)) {
+                warnx("failed, size %zu should be %zu. (12)",
+                    size, wcslen(start));
+                failures++;
+        }
+
+        /* Needed for sparse files */
+        if (wcsncmp(buf, start, wcslen(start)) != 0) {
+                char buf[sizeof(start)];
+                wcstombs(buf, start, sizeof(buf));
+                warnx("failed, buffer didn't start with '%s'. (13)", buf);
+                failures++;
+        }
+        for (i = wcslen(start); i < OFFSET; i++)
+                if (buf[i] != '\0') {
+                        warnx("failed, buffer non zero (offset %d). (14)", i);
+                        failures++;
+                        break;
+                }
+
+        if (memcmp(buf + OFFSET, hello, wcslen(hello)) != 0) {
+                warnx("written string incorrect. (15)");
+                failures++;
+        }
+
+        /* verify that simply seeking past the end doesn't increase the size */
+        if (fseek(fp, 100, SEEK_END) != 0) {
+                warnx("failed to fseek. (16)");
+                failures++;
+        }
+
+        if (fflush(fp) == EOF) {
+                warnx("fflush failed. (17)");
+                failures++;
+        }
+
+        if (size != OFFSET + wcslen(hello)) {
+                warnx("failed, size %zu should be %zu. (18)",
+                    size, OFFSET + wcslen(hello));
+                failures++;
+        }
+
+        if (fseek(fp, -1, SEEK_END) != 0) {
+                warnx("failed to fseek. (19)");
+                failures++;
+        }
+
+        if (fseek(fp, 8, SEEK_SET) != 0) {
+                warnx("failed to fseek. (20)");
+                failures++;
+        }
+
+        if (ftell(fp) != 8) {
+                warnx("failed seek test. (21)");
+                failures++;
+        }
+
+        /* Try to seek backward */
+        if (fseek(fp, -1, SEEK_CUR) != 0) {
+                warnx("failed to fseek. (22)");
+                failures++;
+        }
+
+        if (ftell(fp) != 7) {
+                warnx("failed seeking backward. (23)");
+                failures++;
+        }
+
+        if (fseek(fp, 5, SEEK_CUR) != 0) {
+                warnx("failed to fseek. (24)");
+                failures++;
+        }
+
+        if (fclose(fp) == EOF) {
+                warnx("fclose failed. (25)");
+                failures++;
+        }
+
+        if (size != 12) {
+                warnx("failed, size %zu should be %u.  (26)",
+                    size, 12);
+                failures++;
+        }
+
+        free(buf);
+
+        return (failures);
+}