linux-kernel - Re: [RFC PATCH 2/4] tools/nolibc: add integer types and integer limit macros

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Message-ID: <Y/J3PjGoehYQTK3Y@1wt.eu>
Date:   Sun, 19 Feb 2023 20:23:42 +0100
From:   Willy Tarreau <w@....eu>
To:     Thomas Weißschuh <thomas@...ch.de>
Cc:     Vincent Dagonneau <v@....io>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/4] tools/nolibc: add integer types and integer
 limit macros

On Sun, Feb 19, 2023 at 07:16:57PM +0000, Thomas Weißschuh wrote:
> On Sun, Feb 19, 2023 at 07:51:31PM +0100, Willy Tarreau wrote:
> > From: Vincent Dagonneau <v@....io>
> > 
> > This commit adds some of the missing integer types to stdint.h and adds
> > limit macros (e.g. INTN_{MIN,MAX}).
> > 
> > The reference used for adding these types is
> > https://pubs.opengroup.org/onlinepubs/009695399/basedefs/stdint.h.html.
> > 
> > Note that the maximum size of size_t is implementation-defined (>65535),
> > in this case I chose to stick with what the kernel uses in
> > linux/include/uapi/asm-generic/posix_types.h: unsigned int on 32bits and
> > unsigned long on 64bits.
> > 
> > Signed-off-by: Vincent Dagonneau <v@....io>
> > [wt: size_t is always ulong since it matches the word size on all archs
> >  we care for; calculate the SIZE_MAX, INTPTR_MIN and INTPTR_MAX based on
> >  the compiler-provided __LONG_MAX__]
> > Signed-off-by: Willy Tarreau <w@....eu>
> > ---
> >  tools/include/nolibc/stdint.h | 51 +++++++++++++++++++++++++++++++++++
> >  1 file changed, 51 insertions(+)
> > 
> > diff --git a/tools/include/nolibc/stdint.h b/tools/include/nolibc/stdint.h
> > index 4ba264031df9..5f1adf9316ca 100644
> > --- a/tools/include/nolibc/stdint.h
> > +++ b/tools/include/nolibc/stdint.h
> > @@ -21,4 +21,55 @@ typedef unsigned long     uintptr_t;
> >  typedef   signed long      intptr_t;
> >  typedef   signed long     ptrdiff_t;
> >  
> > +typedef   int8_t       int_least8_t;
> > +typedef  uint8_t      uint_least8_t;
> > +typedef  int16_t      int_least16_t;
> > +typedef uint16_t     uint_least16_t;
> > +typedef  int32_t      int_least32_t;
> > +typedef uint32_t     uint_least32_t;
> > +typedef  int64_t      int_least64_t;
> > +typedef uint64_t     uint_least64_t;
> > +
> > +typedef  int64_t           intmax_t;
> > +typedef uint64_t          uintmax_t;
> > +
> > +/* limits of integral types */
> > +
> > +#define        INT8_MIN  (-128)
> > +#define       INT16_MIN  (-32767-1)
> > +#define       INT32_MIN  (-2147483647-1)
> > +#define       INT64_MIN  (-9223372036854775807LL-1)
> > +
> > +#define        INT8_MAX  (127)
> > +#define       INT16_MAX  (32767)
> > +#define       INT32_MAX  (2147483647)
> > +#define       INT64_MAX  (9223372036854775807LL)
> > +
> > +#define       UINT8_MAX  (255)
> > +#define      UINT16_MAX  (65535)
> > +#define      UINT32_MAX  (4294967295U)
> > +#define      UINT64_MAX  (18446744073709551615ULL)
> > +
> > +#define  INT_LEAST8_MIN  INT8_MIN
> > +#define INT_LEAST16_MIN  INT16_MIN
> > +#define INT_LEAST32_MIN  INT32_MIN
> > +#define INT_LEAST64_MIN  INT64_MIN
> > +
> > +#define  INT_LEAST8_MAX  INT8_MAX
> > +#define INT_LEAST16_MAX  INT16_MAX
> > +#define INT_LEAST32_MAX  INT32_MAX
> > +#define INT_LEAST64_MAX  INT64_MAX
> > +
> > +#define  UINT_LEAST8_MAX UINT8_MAX
> > +#define UINT_LEAST16_MAX UINT16_MAX
> > +#define UINT_LEAST32_MAX UINT32_MAX
> > +#define UINT_LEAST64_MAX UINT64_MAX
> > +
> > +#define SIZE_MAX         ((__SIZE_TYPE__)(__LONG_MAX__) * 2 + 1)
> 
> Nit: size_t would look nicer than __SIZE_TYPE__.

Thanks, I hesitated.

> Also SSIZE_MAX could be added.

Ah I hadn't noticed that ssize_t was defined in the file, in this case
I agree it would be better to have it as well.

> > +#define INTPTR_MIN       (-__LONG_MAX__ - 1)
> > +#define INTPTR_MAX       __LONG_MAX__
> > +#define UINTPTR_MAX      (SIZE_MAX)
> 
> Braces seem unnecessary.

Indeed.

Thanks!
Willy