From ece57cc509cce67000407c2ce49c62b5cef3e8a0 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Fri, 2 Jan 2015 22:22:06 +0000
Subject: [PATCH] libc: add BSD err/warn/errx/warnx interfaces

---
 Library/libs/Makefile |  7 +++--
 Library/libs/__argv.c |  2 ++
 Library/libs/crt0.s   |  6 ++++
 Library/libs/err.c    | 71 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 83 insertions(+), 3 deletions(-)
 create mode 100644 Library/libs/__argv.c
 create mode 100644 Library/libs/err.c

diff --git a/Library/libs/Makefile b/Library/libs/Makefile
index dd8d66a5..6a6e439a 100644
--- a/Library/libs/Makefile
+++ b/Library/libs/Makefile
@@ -12,11 +12,12 @@ SRC_CRT0 = crt0.s
 OBJ_CRT0 = $(SRC_CRT0:.s=.rel)
 SRC_ASM =
 OBJ_ASM = $(SRC_ASM:.s=.rel)
-SRC_C =  abort.c asctime.c assert.c atexit.c
+SRC_C =  __argv.c abort.c asctime.c assert.c atexit.c
 SRC_C += bcmp.c bcopy.c bsearch.c bzero.c calloc.c cfree.c clock.c closedir.c
 SRC_C += clock_gettime.c clock_getres.c clock_settime.c
-SRC_C += creat.c crypt.c ctime.c ctype.c difftime.c errno.c error.c execl.c execv.c
-SRC_C += execvp.c exit.c fclose.c fflush.c fgetc.c fgetgrent.c fgetpwent.c
+SRC_C += creat.c crypt.c ctime.c ctype.c difftime.c err.c errno.c error.c
+SRC_C += execl.c execv.c execvp.c exit.c
+SRC_C += fclose.c fflush.c fgetc.c fgetgrent.c fgetpwent.c
 SRC_C += fgetpos.c fgets.c fopen.c fprintf.c fputc.c fputs.c fread.c free.c
 SRC_C += fsetpos.c ftell.c fwrite.c getcwd.c
 SRC_C += getenv.c __getgrent.c getgrgid.c getgrnam.c getopt.c
diff --git a/Library/libs/__argv.c b/Library/libs/__argv.c
new file mode 100644
index 00000000..0ede031a
--- /dev/null
+++ b/Library/libs/__argv.c
@@ -0,0 +1,2 @@
+char **__argv;
+
diff --git a/Library/libs/crt0.s b/Library/libs/crt0.s
index 0b4c2c6f..a817c79a 100644
--- a/Library/libs/crt0.s
+++ b/Library/libs/crt0.s
@@ -19,6 +19,7 @@
 		.globl _main
 		.globl _exit
 		.globl _environ
+		.globl ___argv
 
 		.globl s__DATA
 		.globl l__DATA
@@ -62,6 +63,11 @@ start2:		ld hl, #l__DATA - 1	 ; work around linker limit
 		ld hl, #4
 		add hl, sp
 		ld (_environ), hl
+		pop de			; argc
+		pop hl			; argv
+		push hl
+		ld (___argv), hl	; needed for stuff like err()
+		push de
 		ld hl, #_exit		; return vector
 		push hl
 		jp _main		; go
diff --git a/Library/libs/err.c b/Library/libs/err.c
new file mode 100644
index 00000000..f631af79
--- /dev/null
+++ b/Library/libs/err.c
@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <err.h>
+
+extern char **__argv;
+
+static void _vdo(int flags, const char *fmt,  va_list args)
+{
+  fprintf(stderr, "%s", __argv[0]);
+  if (fmt) {
+    vfprintf(stderr, fmt, args);
+    if (flags & 1)
+      fprintf(stderr, ": %s", strerror(errno));
+    fputc('\n', stderr);
+  }
+}
+
+void verr(int eval, const char *fmt, va_list args)
+{
+  _vdo(1, fmt, args);
+  exit(eval);
+}
+
+void verrx(int eval, const char *fmt, va_list args)
+{
+  _vdo(0, fmt, args);
+  exit(eval);
+}
+
+void vwarn(const char *fmt, va_list args)
+{
+  _vdo(1, fmt, args);
+}
+
+void vwarnx(const char *fmt, va_list args)
+{
+  _vdo(0, fmt, args);
+}
+
+void err(int eval, const char *fmt, ...)
+{
+  va_list ptr;
+  va_start(ptr, fmt);
+  _vdo(1, fmt, ptr);
+  exit(eval);
+}
+
+void errx(int eval, const char *fmt, ...)
+{
+  va_list ptr;
+  va_start(ptr, fmt);
+  _vdo(0, fmt, ptr);
+  exit(eval);
+}
+
+void warn(const char *fmt, ...)
+{
+  va_list ptr;
+  va_start(ptr, fmt);
+  _vdo(1, fmt, ptr);
+}
+
+void warnx(const char *fmt, ...)
+{
+  va_list ptr;
+  va_start(ptr, fmt);
+  _vdo(0, fmt, ptr);
+}
+
-- 
2.34.1