From ab400c0be5577cab2a66d242183887ebbd61717f Mon Sep 17 00:00:00 2001
From: Nicholas <nbnoll@eml.cc>
Date: Wed, 17 Nov 2021 08:22:03 -0800
Subject: checkin

---
 src/libfmt/fprint.c |  2 +-
 src/libfmt/panic.c  | 15 +++++++++++++++
 src/libfmt/rules.mk |  1 +
 3 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 src/libfmt/panic.c

(limited to 'src/libfmt')

diff --git a/src/libfmt/fprint.c b/src/libfmt/fprint.c
index 26343f7..5077359 100644
--- a/src/libfmt/fprint.c
+++ b/src/libfmt/fprint.c
@@ -1,7 +1,7 @@
 #include "internal.h"
 
 int
-fprint(int fd, char *fmt, ...)
+fmt·fprint(int fd, char *fmt, ...)
 {
     int n;
     va_list args;
diff --git a/src/libfmt/panic.c b/src/libfmt/panic.c
new file mode 100644
index 0000000..25ee277
--- /dev/null
+++ b/src/libfmt/panic.c
@@ -0,0 +1,15 @@
+#include "internal.h"
+
+void
+fmt·panic(char *fmt, ...)
+{
+    char buf[256];
+    va_list arg;
+
+    va_start(arg, fmt);
+    fmt·vesprint(buf, arrend(buf), fmt, arg);
+    va_end(arg);
+
+    fmt·fprint(2, "%s: %s\n", argv0 ? argv0 : "<prog>", buf);
+    exits("fatal");
+}
diff --git a/src/libfmt/rules.mk b/src/libfmt/rules.mk
index 9080bba..75a7bc7 100644
--- a/src/libfmt/rules.mk
+++ b/src/libfmt/rules.mk
@@ -16,6 +16,7 @@ SRCS_$(d):=\
 	$(d)/vnsprint.c\
 	$(d)/vprint.c\
 	$(d)/vwrite.c\
+	$(d)/panic.c\
 	$(d)/write.c
 
 LIBS_$(d):=\
-- 
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