[PATCH v1 1/2] commands: writef write variable contents to file

[gp at high-consulting.de]

From: Gerd Pauli <gp at high-consulting.de>

Signed-off-by: Gerd Pauli <gp at high-consulting.de>
---
 commands/Kconfig  | 10 ++++++++
 commands/Makefile |  1 +
 commands/writef.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+)
 create mode 100644 commands/writef.c

diff --git a/commands/Kconfig b/commands/Kconfig
index ae2dc4b..89b3103 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -1082,6 +1082,16 @@ config CMD_READF
 	  whitespaces are removed, nonvisible characters are stripped. Input is
 	  limited to 1024 characters.
 
+config CMD_WRITEF
+        tristate
+        prompt "writef"
+        help
+          Write variable into file
+
+          Usage: writef VAR FILE
+
+          Writes a line from VARiable into a FILE.
+
 config CMD_SLEEP
 	tristate
 	prompt "sleep"
diff --git a/commands/Makefile b/commands/Makefile
index 37486dc..16c1768 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -103,6 +103,7 @@ obj-$(CONFIG_CMD_BOOT)		+= boot.o
 obj-$(CONFIG_CMD_DEVINFO)	+= devinfo.o
 obj-$(CONFIG_CMD_DRVINFO)	+= drvinfo.o
 obj-$(CONFIG_CMD_READF)		+= readf.o
+obj-$(CONFIG_CMD_WRITEF)	+= writef.o
 obj-$(CONFIG_CMD_MENUTREE)	+= menutree.o
 obj-$(CONFIG_CMD_2048)		+= 2048.o
 obj-$(CONFIG_CMD_REGULATOR)	+= regulator.o
diff --git a/commands/writef.c b/commands/writef.c
new file mode 100644
index 0000000..1cd17b1
--- /dev/null
+++ b/commands/writef.c
@@ -0,0 +1,68 @@
+/*
+ * writef.c - Write Content of Variable to File
+ *
+ * Copyright (c) 2017 Gerd Pauli <gp at high-consulting.de>, HighConsulting GmbH & Co. KG
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <fs.h>
+#include <libfile.h>
+#include <malloc.h>
+#include <linux/stat.h>
+#include <linux/ctype.h>
+#include <environment.h>
+
+static int do_writef(int argc, char *argv[])
+{
+  const char *val;
+  char *variable, *filename;
+  size_t size;
+  void *buf;
+  int ret;
+
+  if (argc != 3)
+    return COMMAND_ERROR_USAGE;
+  
+  variable = argv[1];
+  filename = argv[2];
+  
+  val = getenv(variable);
+  if ( val == NULL )
+    return COMMAND_ERROR;
+  
+  size = strlen(val);
+  size++;
+
+  buf = xmalloc(size+1);
+  sprintf(buf,"%s\n",val);
+
+  ret = write_file(filename, buf, size);
+  free(buf);
+  return ret;
+}
+
+BAREBOX_CMD_HELP_START(writef)
+BAREBOX_CMD_HELP_TEXT("Write Content of VARiable to FILE")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(writef)
+  .cmd		= do_writef,
+  BAREBOX_CMD_DESC("write variable into file")
+  BAREBOX_CMD_OPTS("VAR FILE")
+  BAREBOX_CMD_GROUP(CMD_GRP_SCRIPT)
+  BAREBOX_CMD_HELP(cmd_writef_help)
+BAREBOX_CMD_END
-- 
1.9.1