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[PATCH 02/16] tools: Clone the kernel's strtobool function

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From: Wang Nan <wangnan0@huawei.com>

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 <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1447675815-166222-6-git-send-email-wangnan0@huawei.com
[ Copied it to tools/lib/string.c instead, to make it usable by other tools/ ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 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 <jic23@cam.ac.uk>
+ */
+
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 #include <linux/string.h>
 
 /**
@@ -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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[GIT PULL 00/16] perf/ebpf improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 08/16] perf bpf: Allow BPF program config probing options Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 16/16] perf test: Mute test cases error messages if verbose == 0 Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 03/16] bpf tools: Load a program with different instances using preprocessor Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 01/16] tools: Adopt memdup() from tools/perf, moving it to tools/lib/string.c Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 10/16] perf bpf: Generate prologue for BPF programs Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 04/16] perf bpf: Add BPF_PROLOGUE config options for further patches Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 05/16] perf bpf: Compile dwarf-regs.c if CONFIG_BPF_PROLOGUE is on Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 02/16] tools: Clone the kernel's strtobool function Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 13/16] perf bpf: Use same BPF program if arguments are identical Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 11/16] perf test: Test the BPF prologue adding infrastructure Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 15/16] perf test: Print result for each BPF subtest Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  [PATCH 09/16] perf bpf: Add prologue for BPF programs for fetching arguments Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-17 16:40 +0100
  Re: [GIT PULL 00/16] perf/ebpf improvements and fixes Ingo Molnar <mingo@kernel.org> - 2015-11-18 07:40 +0100
    Re: [GIT PULL 00/16] perf/ebpf improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-18 13:50 +0100
      Re: [GIT PULL 00/16] perf/ebpf improvements and fixes pi3orama <pi3orama@163.com> - 2015-11-18 14:10 +0100
        Re: [GIT PULL 00/16] perf/ebpf improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-18 14:30 +0100

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