From fd685bad3b3835536c5b0f5b5b18f5ab13f32bf4 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Thu, 28 Nov 2024 00:16:54 +0100
Subject: add missing files

---
 userland/libc/math/fmin.c    | 14 +++++++++++
 userland/libc/stdio/fdopen.c | 58 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 userland/libc/math/fmin.c
 create mode 100644 userland/libc/stdio/fdopen.c

diff --git a/userland/libc/math/fmin.c b/userland/libc/math/fmin.c
new file mode 100644
index 0000000..b4aca16
--- /dev/null
+++ b/userland/libc/math/fmin.c
@@ -0,0 +1,14 @@
+#include <libc_test.h>
+#include <math.h>
+
+double fmin(double x, double y) {
+  if (x > y) {
+    return y;
+  }
+  return x;
+}
+
+LIBC_TEST(fmin, {
+  TEST_ASSERT(0 == fmin(1, 0));
+  TEST_ASSERT(0 == fmin(0, 1));
+})
diff --git a/userland/libc/stdio/fdopen.c b/userland/libc/stdio/fdopen.c
new file mode 100644
index 0000000..9e7c7c6
--- /dev/null
+++ b/userland/libc/stdio/fdopen.c
@@ -0,0 +1,58 @@
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+// FIXME: All modes not implemented
+// https://pubs.opengroup.org/onlinepubs/9699919799/functions/fdopen.html
+FILE *fdopen(int fildes, const char *mode) {
+  FILE *r = calloc(1, sizeof(FILE));
+  if (!r) {
+    errno = -ENOMEM;
+    return NULL;
+  }
+
+  for (; *mode; mode++) {
+    // r or rb
+    // Open file for reading.
+    // w or wb
+    // Truncate to zero length or create file for writing.
+    // a or ab
+    // Append; open or create file for writing at
+    // end-of-file.
+    switch (*mode) {
+    case 'r':
+      r->can_read = 1;
+      break;
+    case 'w':
+      r->can_write = 1;
+      break;
+    case 'a':
+      r->append = 1;
+      break;
+    }
+  }
+
+  struct stat s;
+  if (-1 == fstat(fildes, &s)) {
+    free(r);
+    errno = -EBADF;
+    return NULL;
+  }
+
+  r->read = read_fd;
+  r->write = write_fd;
+  r->seek = seek_fd;
+  r->has_error = 0;
+  r->is_eof = 0;
+  r->offset_in_file = 0;
+  r->file_size = s.st_size;
+  r->cookie = NULL;
+  r->fd = fildes;
+  r->read_buffer = NULL;
+  r->read_buffer_stored = 0;
+  r->fflush = fflush_fd;
+  r->has_control_over_the_fd = 0;
+  return r;
+}
-- 
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