[PATCH v9 1/8] x86/boot: Introduce cmdline_find_option_arg()to detect if option=arg in cmdline

Chao Fan
2018-10-17T10:20:05Z

Introduce a new function cmdline_find_option_arg() to detect whether
option is in command line and the value is arg.

Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com>
---
arch/x86/boot/compressed/cmdline.c | 15 +++++++++++++++
arch/x86/boot/compressed/misc.h | 1 +
2 files changed, 16 insertions(+)

diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
index af6cda0b7900..61118c69feb8 100644
--- a/arch/x86/boot/compressed/cmdline.c
+++ b/arch/x86/boot/compressed/cmdline.c
@@ -1,5 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include "misc.h"
+#define STATIC
+#include <linux/decompress/mm.h>

#if CONFIG_EARLY_PRINTK || CONFIG_RANDOMIZE_BASE || CONFIG_X86_5LEVEL

@@ -30,5 +32,18 @@ int cmdline_find_option_bool(const char *option)
{
return __cmdline_find_option_bool(get_cmd_line_ptr(), option);
}
+bool cmdline_find_option_arg(const char *option, const char *arg, int argsize)
+{
+ char *buffer = malloc(argsize+1);
+ bool find = false;
+ int ret;
+
+ ret = cmdline_find_option(option, buffer, argsize+1);
+ if (ret == argsize && !strncmp(buffer, arg, argsize))
+ find = true;
+
+ free(buffer);
+ return find;
+}

#endif
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index a1d5918765f3..008fdc47a29c 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -67,6 +67,7 @@ static inline void debug_puthex(const char *s)
/* cmdline.c */
int cmdline_find_option(const char *option, char *buffer, int bufsize);
int cmdline_find_option_bool(const char *option);
+bool cmdline_find_option_arg(const char *option, const char *arg, int argsize);
#endif

--
2.17.2