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