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libs: fix visual studio Compiler Error C2124

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D:\code\incubator-nuttx\libs\libc\stdlib\lib_strtod.c: error C2124: divide or mod by zero

Windows MSVC restrictions, MSVC doesn't allow division through a
zero literal, but allows it through non-const variable set to zero

Reference:
https://docs.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/compiler-error-c2124?view=msvc-170

Signed-off-by: chao an <anchao@xiaomi.com>
This commit is contained in:
chao an 2022-09-25 23:19:54 +08:00 committed by Xiang Xiao
parent 34192c07de
commit 09c006b9c8
2 changed files with 26 additions and 4 deletions
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15
libs/libc/stdlib/lib_strtod.c
View File

@ -71,7 +71,12 @@
static inline int is_real(double x)
{
const double infinite = 1.0 / 0.0;
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
const double divzero = 0.0;
const double infinite = 1.0 / divzero;
return (x < infinite) && (x >= -infinite);
}
@ -101,7 +106,13 @@ double strtod(FAR const char *str, FAR char **endptr)
int n;
int num_digits;
int num_decimals;
const double infinite = 1.0 / 0.0;
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
const double divzero = 0.0;
const double infinite = 1.0 / divzero;
/* Skip leading whitespace */

15
libs/libc/stdlib/lib_strtold.c
View File

@ -71,7 +71,12 @@
static inline int is_real(long double x)
{
const long double infinite = 1.0L / 0.0L;
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
const long double divzero = 0.0L;
const long double infinite = 1.0L / divzero;
return (x < infinite) && (x >= -infinite);
}
@ -101,7 +106,13 @@ long double strtold(FAR const char *str, FAR char **endptr)
int n;
int num_digits;
int num_decimals;
const long double infinite = 1.0L / 0.0L;
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
const long double divzero = 0.0L;
const long double infinite = 1.0L / divzero;
/* Skip leading whitespace */