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authorBaoquan He <bhe@redhat.com>2017-04-17 21:34:56 +0800
committerIngo Molnar <mingo@kernel.org>2017-04-18 10:37:13 +0200
commitf51b17c8d90f85456579c3192ab59ee031835634 (patch)
tree7dc3151d5548cd99bd5b13f136950a64ace7d944 /lib
parent4729277156cf18acd9b9b04d6ef8c2a8a7bf00dc (diff)
downloadlinux-f51b17c8d90f85456579c3192ab59ee031835634.tar.bz2
boot/param: Move next_arg() function to lib/cmdline.c for later reuse
next_arg() will be used to parse boot parameters in the x86/boot/compressed code, so move it to lib/cmdline.c for better code reuse. No change in functionality. Signed-off-by: Baoquan He <bhe@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Cc: Jens Axboe <axboe@fb.com> Cc: Jessica Yu <jeyu@redhat.com> Cc: Johannes Berg <johannes.berg@intel.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Larry Finger <Larry.Finger@lwfinger.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: dan.j.williams@intel.com Cc: dave.jiang@intel.com Cc: dyoung@redhat.com Cc: keescook@chromium.org Cc: zijun_hu <zijun_hu@htc.com> Link: http://lkml.kernel.org/r/1492436099-4017-2-git-send-email-bhe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/cmdline.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/cmdline.c b/lib/cmdline.c
index 8f13cf73c2ec..3c6432df7e63 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -15,6 +15,7 @@
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/string.h>
+#include <linux/ctype.h>
/*
* If a hyphen was found in get_option, this will handle the
@@ -189,3 +190,59 @@ bool parse_option_str(const char *str, const char *option)
return false;
}
+
+/*
+ * Parse a string to get a param value pair.
+ * You can use " around spaces, but can't escape ".
+ * Hyphens and underscores equivalent in parameter names.
+ */
+char *next_arg(char *args, char **param, char **val)
+{
+ unsigned int i, equals = 0;
+ int in_quote = 0, quoted = 0;
+ char *next;
+
+ if (*args == '"') {
+ args++;
+ in_quote = 1;
+ quoted = 1;
+ }
+
+ for (i = 0; args[i]; i++) {
+ if (isspace(args[i]) && !in_quote)
+ break;
+ if (equals == 0) {
+ if (args[i] == '=')
+ equals = i;
+ }
+ if (args[i] == '"')
+ in_quote = !in_quote;
+ }
+
+ *param = args;
+ if (!equals)
+ *val = NULL;
+ else {
+ args[equals] = '\0';
+ *val = args + equals + 1;
+
+ /* Don't include quotes in value. */
+ if (**val == '"') {
+ (*val)++;
+ if (args[i-1] == '"')
+ args[i-1] = '\0';
+ }
+ }
+ if (quoted && args[i-1] == '"')
+ args[i-1] = '\0';
+
+ if (args[i]) {
+ args[i] = '\0';
+ next = args + i + 1;
+ } else
+ next = args + i;
+
+ /* Chew up trailing spaces. */
+ return skip_spaces(next);
+ //return next;
+}