From 872cf03f26c2801ae6c3008ce5fa0d7856f5f85d Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Sun, 14 Dec 2025 18:10:13 +0100
Subject: libc: implement err/warn functions

---
 lib/libc/err/Kbuild   |  8 ++++++++
 lib/libc/err/err.c    | 10 ++++++++++
 lib/libc/err/errx.c   | 10 ++++++++++
 lib/libc/err/verr.c   |  9 +++++++++
 lib/libc/err/verrx.c  |  9 +++++++++
 lib/libc/err/vwarn.c  | 16 ++++++++++++++++
 lib/libc/err/vwarnx.c | 16 ++++++++++++++++
 lib/libc/err/warn.c   | 10 ++++++++++
 lib/libc/err/warnx.c  | 10 ++++++++++
 9 files changed, 98 insertions(+)
 create mode 100644 lib/libc/err/Kbuild
 create mode 100644 lib/libc/err/err.c
 create mode 100644 lib/libc/err/errx.c
 create mode 100644 lib/libc/err/verr.c
 create mode 100644 lib/libc/err/verrx.c
 create mode 100644 lib/libc/err/vwarn.c
 create mode 100644 lib/libc/err/vwarnx.c
 create mode 100644 lib/libc/err/warn.c
 create mode 100644 lib/libc/err/warnx.c

(limited to 'lib/libc/err')

diff --git a/lib/libc/err/Kbuild b/lib/libc/err/Kbuild
new file mode 100644
index 00000000..e60623f5
--- /dev/null
+++ b/lib/libc/err/Kbuild
@@ -0,0 +1,8 @@
+obj-y += err.o
+obj-y += errx.o
+obj-y += verr.o
+obj-y += verrx.o
+obj-y += vwarn.o
+obj-y += vwarnx.o
+obj-y += warn.o
+obj-y += warnx.o
diff --git a/lib/libc/err/err.c b/lib/libc/err/err.c
new file mode 100644
index 00000000..5b1b2b02
--- /dev/null
+++ b/lib/libc/err/err.c
@@ -0,0 +1,10 @@
+#include <err.h>
+#include <stdarg.h>
+
+__dead void err(int eval, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	verr(eval, fmt, ap);
+	va_end(ap);
+}
diff --git a/lib/libc/err/errx.c b/lib/libc/err/errx.c
new file mode 100644
index 00000000..0afe999e
--- /dev/null
+++ b/lib/libc/err/errx.c
@@ -0,0 +1,10 @@
+#include <err.h>
+#include <stdarg.h>
+
+__dead void errx(int eval, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	verrx(eval, fmt, ap);
+	va_end(ap);
+}
diff --git a/lib/libc/err/verr.c b/lib/libc/err/verr.c
new file mode 100644
index 00000000..d769c15c
--- /dev/null
+++ b/lib/libc/err/verr.c
@@ -0,0 +1,9 @@
+#include <err.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+__dead void verr(int eval, const char *fmt, va_list args)
+{
+	vwarn(fmt, args);
+	exit(eval);
+}
diff --git a/lib/libc/err/verrx.c b/lib/libc/err/verrx.c
new file mode 100644
index 00000000..d769c15c
--- /dev/null
+++ b/lib/libc/err/verrx.c
@@ -0,0 +1,9 @@
+#include <err.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+__dead void verr(int eval, const char *fmt, va_list args)
+{
+	vwarn(fmt, args);
+	exit(eval);
+}
diff --git a/lib/libc/err/vwarn.c b/lib/libc/err/vwarn.c
new file mode 100644
index 00000000..2f485d93
--- /dev/null
+++ b/lib/libc/err/vwarn.c
@@ -0,0 +1,16 @@
+#include <stdarg.h>
+#include <stdio.h>
+
+extern char *__progname;
+
+void vwarn(const char *fmt, va_list args)
+{
+	fprintf(stderr, "%s: ", __progname);
+
+	if (fmt != NULL) {
+		vfprintf(stderr, fmt, args);
+		fprintf(stderr, ": ");
+	}
+
+	perror(NULL);
+}
diff --git a/lib/libc/err/vwarnx.c b/lib/libc/err/vwarnx.c
new file mode 100644
index 00000000..2f485d93
--- /dev/null
+++ b/lib/libc/err/vwarnx.c
@@ -0,0 +1,16 @@
+#include <stdarg.h>
+#include <stdio.h>
+
+extern char *__progname;
+
+void vwarn(const char *fmt, va_list args)
+{
+	fprintf(stderr, "%s: ", __progname);
+
+	if (fmt != NULL) {
+		vfprintf(stderr, fmt, args);
+		fprintf(stderr, ": ");
+	}
+
+	perror(NULL);
+}
diff --git a/lib/libc/err/warn.c b/lib/libc/err/warn.c
new file mode 100644
index 00000000..4f12995a
--- /dev/null
+++ b/lib/libc/err/warn.c
@@ -0,0 +1,10 @@
+#include <err.h>
+#include <stdarg.h>
+
+void warn(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vwarn(fmt, ap);
+	va_end(ap);
+}
diff --git a/lib/libc/err/warnx.c b/lib/libc/err/warnx.c
new file mode 100644
index 00000000..fa0e6fda
--- /dev/null
+++ b/lib/libc/err/warnx.c
@@ -0,0 +1,10 @@
+#include <err.h>
+#include <stdarg.h>
+
+void warnx(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vwarnx(fmt, ap);
+	va_end(ap);
+}
-- 
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