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type-props: New macro for estimating length of a decimal integer.

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This commit is contained in:
Ben Pfaff
2011-04-01 10:20:17 -07:00
parent fe1e967e3b
commit 67a51a1d85
2 changed files with 19 additions and 3 deletions
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9
lib/type-props.h
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@@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2008 Nicira Networks. * Copyright (c) 2008, 2011 Nicira Networks.
* *
* Licensed under the Apache License, Version 2.0 (the "License"); * Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. * you may not use this file except in compliance with the License.
@@ -29,4 +29,11 @@
? ~(~(TYPE)0 << TYPE_VALUE_BITS(TYPE)) \ ? ~(~(TYPE)0 << TYPE_VALUE_BITS(TYPE)) \
: (TYPE)-1) : (TYPE)-1)
/* Number of decimal digits required to format an integer of the given TYPE.
* Includes space for a sign, if TYPE is signed, but not for a null
* terminator.
*
* The value is an overestimate. */
#define INT_STRLEN(TYPE) (TYPE_IS_SIGNED(TYPE) + TYPE_VALUE_BITS(TYPE) / 3 + 1)
#endif /* type-props.h */ #endif /* type-props.h */

13
tests/test-type-props.c
View File

@@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2008, 2009 Nicira Networks. * Copyright (c) 2008, 2009, 2011 Nicira Networks.
* *
* Licensed under the Apache License, Version 2.0 (the "License"); * Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. * you may not use this file except in compliance with the License.
@@ -16,8 +16,10 @@
#include <config.h> #include <config.h>
#include "type-props.h" #include "type-props.h"
#include <inttypes.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
#define MUST_SUCCEED(EXPRESSION) \ #define MUST_SUCCEED(EXPRESSION) \
if (!(EXPRESSION)) { \ if (!(EXPRESSION)) { \
@@ -30,11 +32,18 @@
MUST_SUCCEED(TYPE_IS_INTEGER(type)); \ MUST_SUCCEED(TYPE_IS_INTEGER(type)); \
MUST_SUCCEED(TYPE_IS_SIGNED(type) == is_signed); \ MUST_SUCCEED(TYPE_IS_SIGNED(type) == is_signed); \
MUST_SUCCEED(TYPE_MAXIMUM(type) == maximum); \ MUST_SUCCEED(TYPE_MAXIMUM(type) == maximum); \
MUST_SUCCEED(TYPE_MINIMUM(type) == minimum); MUST_SUCCEED(TYPE_MINIMUM(type) == minimum); \
sprintf(max_s, "%"PRIuMAX, (uintmax_t) (maximum)); \
MUST_SUCCEED(strlen(max_s) <= INT_STRLEN(type)); \
sprintf(min_s, "%"PRIdMAX, (intmax_t) (minimum)); \
MUST_SUCCEED(strlen(min_s) <= INT_STRLEN(type));
int int
main (void) main (void)
{ {
char max_s[128];
char min_s[128];
TEST_TYPE(char, CHAR_MIN, CHAR_MAX, (CHAR_MIN < 0)); TEST_TYPE(char, CHAR_MIN, CHAR_MAX, (CHAR_MIN < 0));
TEST_TYPE(signed char, SCHAR_MIN, SCHAR_MAX, 1); TEST_TYPE(signed char, SCHAR_MIN, SCHAR_MAX, 1);