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    SubjectRe: [PATCH] perf tools: New function to parse string representing size in bytes
    On Sun, Nov 15, 2009 at 12:50:45PM +0900, Hitoshi Mitake wrote:
    > This patch modifies util/string.[ch] to add new function: bytesexp2int()
    > to parse string representing size in bytes.
    >
    > Below is the description of bytesexp2int().
    >
    > Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB) (e.g. "256MB")
    > and return its numeric value. (e.g. 268435456)
    >
    > The parameter str is not changed before and after calling,
    > but it changed temporally and internally for atoi().
    > So type of str is char *, not const char *.
    >
    > Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
    > Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > Cc: Paul Mackerras <paulus@samba.org>
    > Cc: Frederic Weisbecker <fweisbec@gmail.com>
    > ---
    > tools/perf/util/string.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++
    > tools/perf/util/string.h | 1 +
    > 2 files changed, 90 insertions(+), 0 deletions(-)
    >
    > diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
    > index 04743d3..bbedb06 100644
    > --- a/tools/perf/util/string.c
    > +++ b/tools/perf/util/string.c
    > @@ -1,4 +1,5 @@
    > #include <string.h>
    > +#include <stdlib.h>
    > #include "string.h"
    >
    > static int hex(char ch)
    > @@ -43,3 +44,91 @@ char *strxfrchar(char *s, char from, char to)
    >
    > return s;
    > }
    > +
    > +static int digit(char ch)
    > +{
    > + if ('0' <= ch && ch <= '9')
    > + return 1;
    > + return 0;
    > +}



    We have a "isdigit" macro in util.h already, despite the even already
    existing isdigit from the libc. I don't know why we have that. I guess
    it comes from git sources but I'm not sure why it has been reimplemented.



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