From 89b9f52f1ebfa9d535437268730cfe4d6d997bfe Mon Sep 17 00:00:00 2001
From: Christoffer Lerno <christoffer@aegik.com>
Date: Sat, 7 Feb 2026 20:25:28 +0100
Subject: [PATCH] Add libc mktemp and tempnam. Update test.

---
 lib/std/libc/libc.c3                       | 2 ++
 test/unit/stdlib/io/file_mmap.c3           | 6 +++++-
 test/unit/stdlib/io/file_read_write_any.c3 | 5 ++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/std/libc/libc.c3 b/lib/std/libc/libc.c3
index 22b551319..c7f659fdd 100644
--- a/lib/std/libc/libc.c3
+++ b/lib/std/libc/libc.c3
@@ -126,6 +126,7 @@ extern fn CInt memcmp(void* buf1, void* buf2, usz count);
 extern fn void* memcpy(void* dest, void* src, usz n);
 extern fn void* memmove(void* dest, void* src, usz n);
 extern fn void* memset(void* dest, CInt value, usz n);
+extern fn ZString mktemp(char* template) @cname(env::WIN32 ??? "_mktemp" : "mktemp");
 extern fn Time_t* mktime(Tm* time) @if(!env::WIN32);
 extern fn void perror(ZString string);
 extern fn CInt printf(ZString format, ...);
@@ -177,6 +178,7 @@ extern fn CLong strtol(char* str, char** endptr, CInt base);
 extern fn CULong strtoul(char* str, char** endptr, CInt base);
 extern fn usz strxfrm(char* dest, ZString src, usz n);
 extern fn CInt system(ZString str);
+extern fn ZString tempnam(ZString dir, ZString prefix) @cname(env::WIN32 ??? "_tempnam" : "tempnam") @nodiscard;
 extern fn Time_t timegm(Tm* timeptr) @if(!env::WIN32 && !env::NETBSD);
 extern fn ZString tmpnam(char *buffer);
 extern fn CFile tmpfile();
diff --git a/test/unit/stdlib/io/file_mmap.c3 b/test/unit/stdlib/io/file_mmap.c3
index 4ceabacb1..3659ce374 100644
--- a/test/unit/stdlib/io/file_mmap.c3
+++ b/test/unit/stdlib/io/file_mmap.c3
@@ -5,7 +5,11 @@ tlocal char[1024] buf;
 
 fn String random_name()
 {
-	return libc::tmpnam(&buf).str_view();
+	ZString str = libc::tempnam(null, "randfile_");
+	String s = str.str_view();
+	buf[:s.len] = s[..];
+	libc::free(str);
+	return (String)buf[:s.len];
 }
 
 fn void map_read_only() @test
diff --git a/test/unit/stdlib/io/file_read_write_any.c3 b/test/unit/stdlib/io/file_read_write_any.c3
index fd01909aa..f9d155b90 100644
--- a/test/unit/stdlib/io/file_read_write_any.c3
+++ b/test/unit/stdlib/io/file_read_write_any.c3
@@ -58,7 +58,10 @@ fn void read_write_any()
 	data.hello = 0xCC;
 
 	char[1024] buf;
-	String name = libc::tmpnam(&buf).str_view();
+
+	ZString zname = libc::tempnam(null, "testfile_");
+	defer libc::free(zname);
+	String name = zname.str_view();
     File file = file::open(name, "wb")!!;
 
 	io::write_any(&file, &data)!!;