From 4e09bca9e34c226b6d7e34b4fa11248405fd988e Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sun, 22 Oct 2023 19:50:38 +0200
Subject: Move everything into a new repo.

---
 userland/libc/stdio/vdprintf.c | 77 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 userland/libc/stdio/vdprintf.c

(limited to 'userland/libc/stdio/vdprintf.c')

diff --git a/userland/libc/stdio/vdprintf.c b/userland/libc/stdio/vdprintf.c
new file mode 100644
index 0000000..b3fa065
--- /dev/null
+++ b/userland/libc/stdio/vdprintf.c
@@ -0,0 +1,77 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+struct vd_cookie {
+  int fd;
+  char *buffer;
+  uint8_t buf_len;
+  uint8_t buf_used;
+  int sent_bytes;
+};
+
+size_t min(size_t a, size_t b) { return (a < b) ? a : b; }
+
+size_t vd_write(FILE *f, const unsigned char *s, size_t l) {
+  struct vd_cookie *c = f->cookie;
+
+  int clear_buffer = 0;
+  size_t b_copy = min(l, c->buf_len - (c->buf_used));
+  for (int i = 0; i < b_copy; i++) {
+    c->buffer[c->buf_used + i] = s[i];
+    if (s[i] == '\n')
+      clear_buffer = 1;
+  }
+  c->buf_used += b_copy;
+
+  if (clear_buffer) {
+    int rc = write(c->fd, c->buffer, c->buf_used);
+    c->buf_used = 0;
+    if (-1 == rc) {
+      return (size_t)-1;
+    }
+    c->sent_bytes += rc;
+  }
+  return l;
+}
+
+int vdprintf(int fd, const char *format, va_list ap) {
+  FILE f = {
+      .write = write_fd,
+      .fd = fd,
+  };
+  return vfprintf(&f, format, ap);
+  //    return -1;
+  /*
+char buffer[32];
+struct vd_cookie c = {.fd = fd,
+                  .buffer = buffer,
+                  .buf_len = 32,
+                  .buf_used = 0,
+                  .sent_bytes = 0};
+FILE f = {
+.write = vd_write,
+.cookie = &c,
+};
+
+// If an output error was encountered, these functions shall return a
+// negative value and set errno to indicate the error.
+if (-1 == vfprintf(&f, format, ap))
+return -1;
+
+// Upon successful completion, the dprintf(),
+// fprintf(), and printf() functions shall return the number of bytes
+// transmitted.
+
+if(0 == c.buf_used)
+return c.sent_bytes;
+
+// First the current buffer needs to be cleared
+int rc = write(fd, buffer, c.buf_used);
+if (-1 == rc) {
+return -1;
+}
+c.sent_bytes += rc;
+return c.sent_bytes;*/
+}
-- 
cgit v1.2.3