[PATCH 04/37] tools: Clone the kernel's strtobool function

[Arnaldo Carvalho de Melo]

From: Wang Nan 

Copying it to tools/lib/string.c, the counterpart to the kernel's
lib/string.c.

This is preparation for enhancing BPF program configuration, which will
allow config string like 'inlines=yes'.

Signed-off-by: Wang Nan 
Cc: Alexei Starovoitov 
Cc: Jonathan Cameron 
Cc: Masami Hiramatsu 
Cc: Zefan Li 
Cc: pi3or...@163.com
Link: 
http://lkml.kernel.org/r/1447675815-166222-6-git-send-email-wangn...@huawei.com
[ Copied it to tools/lib/string.c instead, to make it usable by other tools/ ]
Signed-off-by: Arnaldo Carvalho de Melo 
---
 tools/include/linux/string.h |  2 ++
 tools/lib/string.c   | 43 +++
 2 files changed, 45 insertions(+)

diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h
index f3a6db6ad732..2e2f736c039c 100644
--- a/tools/include/linux/string.h
+++ b/tools/include/linux/string.h
@@ -6,4 +6,6 @@
 
 void *memdup(const void *src, size_t len);
 
+int strtobool(const char *s, bool *res);
+
 #endif /* _LINUX_STRING_H_ */
diff --git a/tools/lib/string.c b/tools/lib/string.c
index ecfd43a9b24e..065e54f42d8f 100644
--- a/tools/lib/string.c
+++ b/tools/lib/string.c
@@ -1,5 +1,20 @@
+/*
+ *  linux/tools/lib/string.c
+ *
+ *  Copied from linux/lib/string.c, where it is:
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  More specifically, the first copied function was strtobool, which
+ *  was introduced by:
+ *
+ *  d0f1fed29e6e ("Add a strtobool function matching semantics of existing in 
kernel equivalents")
+ *  Author: Jonathan Cameron 
+ */
+
 #include 
 #include 
+#include 
 #include 
 
 /**
@@ -17,3 +32,31 @@ void *memdup(const void *src, size_t len)
 
return p;
 }
+
+/**
+ * strtobool - convert common user inputs into boolean values
+ * @s: input string
+ * @res: result
+ *
+ * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
+ * Otherwise it will return -EINVAL.  Value pointed to by res is
+ * updated upon finding a match.
+ */
+int strtobool(const char *s, bool *res)
+{
+   switch (s[0]) {
+   case 'y':
+   case 'Y':
+   case '1':
+   *res = true;
+   break;
+   case 'n':
+   case 'N':
+   case '0':
+   *res = false;
+   break;
+   default:
+   return -EINVAL;
+   }
+   return 0;
+}
-- 
2.1.0

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[PATCH 04/37] tools: Clone the kernel's strtobool function

[Arnaldo Carvalho de Melo]

From: Wang Nan 

Copying it to tools/lib/string.c, the counterpart to the kernel's
lib/string.c.

This is preparation for enhancing BPF program configuration, which will
allow config string like 'inlines=yes'.

Signed-off-by: Wang Nan 
Cc: Alexei Starovoitov 
Cc: Jonathan Cameron 
Cc: Masami Hiramatsu 
Cc: Zefan Li 
Cc: pi3or...@163.com
Link: 
http://lkml.kernel.org/r/1447675815-166222-6-git-send-email-wangn...@huawei.com
[ Copied it to tools/lib/string.c instead, to make it usable by other tools/ ]
Signed-off-by: Arnaldo Carvalho de Melo 
---
 tools/include/linux/string.h |  2 ++
 tools/lib/string.c   | 43 +++
 2 files changed, 45 insertions(+)

diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h
index f3a6db6ad732..2e2f736c039c 100644
--- a/tools/include/linux/string.h
+++ b/tools/include/linux/string.h
@@ -6,4 +6,6 @@
 
 void *memdup(const void *src, size_t len);
 
+int strtobool(const char *s, bool *res);
+
 #endif /* _LINUX_STRING_H_ */
diff --git a/tools/lib/string.c b/tools/lib/string.c
index ecfd43a9b24e..065e54f42d8f 100644
--- a/tools/lib/string.c
+++ b/tools/lib/string.c
@@ -1,5 +1,20 @@
+/*
+ *  linux/tools/lib/string.c
+ *
+ *  Copied from linux/lib/string.c, where it is:
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  More specifically, the first copied function was strtobool, which
+ *  was introduced by:
+ *
+ *  d0f1fed29e6e ("Add a strtobool function matching semantics of existing in 
kernel equivalents")
+ *  Author: Jonathan Cameron 
+ */
+
 #include 
 #include 
+#include 
 #include 
 
 /**
@@ -17,3 +32,31 @@ void *memdup(const void *src, size_t len)
 
return p;
 }
+
+/**
+ * strtobool - convert common user inputs into boolean values
+ * @s: input string
+ * @res: result
+ *
+ * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
+ * Otherwise it will return -EINVAL.  Value pointed to by res is
+ * updated upon finding a match.
+ */
+int strtobool(const char *s, bool *res)
+{
+   switch (s[0]) {
+   case 'y':
+   case 'Y':
+   case '1':
+   *res = true;
+   break;
+   case 'n':
+   case 'N':
+   case '0':
+   *res = false;
+   break;
+   default:
+   return -EINVAL;
+   }
+   return 0;
+}
-- 
2.1.0

--
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Please read the FAQ at  http://www.tux.org/lkml/