From d1ff7bcc91886626dc9060ec5fb67ee102ab7c1d Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Mon, 11 Mar 2024 21:30:31 -0400
Subject: usermode capable kernel with logging syscall

---
 io/log.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 io/log.c

(limited to 'io/log.c')

diff --git a/io/log.c b/io/log.c
new file mode 100644
index 0000000..14397a7
--- /dev/null
+++ b/io/log.c
@@ -0,0 +1,68 @@
+#include "log.h"
+#include "lib/jove.h"
+#include "lib/string.h"
+#include "lib/format.h"
+
+static struct LogDevice *s_first_logdev = NULL;
+
+void
+klog_newdev(struct LogDevice *dev)
+{
+    if(s_first_logdev == NULL) {
+        s_first_logdev = dev;
+    }else{
+        dev->chain = s_first_logdev;
+        s_first_logdev = dev;
+    }
+}
+
+static void
+s_klogc(struct LogDevice *dev, char c)
+{
+    dev->out(&c, 1);
+    if(dev->chain != NULL)
+        s_klogc(dev->chain, c);
+}
+
+void
+klogc(char c)
+{
+    s_klogc(s_first_logdev, c);
+}
+
+static void
+s_klogs(struct LogDevice *dev, const char *s, size_t slen)
+{
+    dev->out(s, slen);
+    if(dev->chain != NULL)
+        s_klogs(dev->chain, s, slen);
+}
+
+void
+klogs(const char *s)
+{
+    size_t slen = strlen(s);
+    s_klogs(s_first_logdev, s, slen);
+}
+
+void
+klogsn(const char *s, size_t len)
+{
+    s_klogs(s_first_logdev, s, len);
+}
+
+void
+kvlogf(const char *fmt, va_list ap)
+{
+    char buffer[256];
+    svfmt(buffer, 256, fmt, ap);
+    klogs(buffer);
+}
+
+void klogf(const char *fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    kvlogf(fmt, ap);
+    va_end(ap);
+}
-- 
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