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

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Message-Id: <20230219185133.14576-3-w@1wt.eu>
Date:   Sun, 19 Feb 2023 19:51:31 +0100
From:   Willy Tarreau <w@....eu>
To:     Vincent Dagonneau <v@....io>
Cc:     linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/4] tools/nolibc: add integer types and integer limit macros

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)
+#define INTPTR_MIN       (-__LONG_MAX__ - 1)
+#define INTPTR_MAX       __LONG_MAX__
+#define UINTPTR_MAX      (SIZE_MAX)
+#define PTRDIFF_MIN      INTPTR_MIN
+#define PTRDIFF_MAX      INTPTR_MAX
+
 #endif /* _NOLIBC_STDINT_H */
-- 
2.35.3