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libc: Port strtod fixes to strtof, strtold and improve comments

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* libs/libc/stdlib/lib_strtod.c:
  (strtod): Add a note about limitations of this implementation
   as compared to POSIX in the function's docstring. Also fix a
   typo.

* libs/libc/stdlib/lib_strtof.c:
  (strtof): Port the changes made to strtod in PR-6952 (commit
   c83985c5ce7) and add same note as above to docstring.

* libs/libc/stdlib/lib_strtold.c:
  (strtold): Same changes as strtof.
This commit is contained in:
Nathan Hartman 2022-08-29 16:53:36 -04:00 committed by Xiang Xiao
parent c83985c5ce
commit a0ee5d3747
3 changed files with 33 additions and 3 deletions
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6
libs/libc/stdlib/lib_strtod.c
View File

@ -79,12 +79,16 @@ static inline int is_real(double x)
* Public Functions
****************************************************************************/
/***************************************************(************************
/****************************************************************************
* Name: strtod
*
* Description:
* Convert a string to a double value
*
* NOTE: This implementation is limited as compared to POSIX:
* - Hexadecimal input is not supported
* - INF, INFINITY, NAN, and NAN(...) are not supported
*
****************************************************************************/
double strtod(FAR const char *str, FAR char **endptr)

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

@ -86,12 +86,16 @@ static inline int is_real(float x)
* Public Functions
****************************************************************************/
/***************************************************(************************
/****************************************************************************
* Name: strtof
*
* Description:
* Convert a string to a float value
*
* NOTE: This implementation is limited as compared to POSIX:
* - Hexadecimal input is not supported
* - INF, INFINITY, NAN, and NAN(...) are not supported
*
****************************************************************************/
float strtof(FAR const char *str, FAR char **endptr)
@ -173,6 +177,7 @@ float strtof(FAR const char *str, FAR char **endptr)
{
set_errno(ERANGE);
number = 0.0F;
p = (FAR char *)str;
goto errout;
}
@ -208,6 +213,14 @@ float strtof(FAR const char *str, FAR char **endptr)
/* Process string of digits */
if (!isdigit(*p))
{
set_errno(ERANGE);
number = 0.0F;
p = (FAR char *)str;
goto errout;
}
n = 0;
while (isdigit(*p))
{

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

@ -79,12 +79,16 @@ static inline int is_real(long double x)
* Public Functions
****************************************************************************/
/***************************************************(************************
/****************************************************************************
* Name: strtold
*
* Description:
* Convert a string to a long double value
*
* NOTE: This implementation is limited as compared to POSIX:
* - Hexadecimal input is not supported
* - INF, INFINITY, NAN, and NAN(...) are not supported
*
****************************************************************************/
long double strtold(FAR const char *str, FAR char **endptr)
@ -160,6 +164,7 @@ long double strtold(FAR const char *str, FAR char **endptr)
{
set_errno(ERANGE);
number = 0.0L;
p = (FAR char *)str;
goto errout;
}
@ -195,6 +200,14 @@ long double strtold(FAR const char *str, FAR char **endptr)
/* Process string of digits */
if (!isdigit(*p))
{
set_errno(ERANGE);
number = 0.0L;
p = (FAR char *)str;
goto errout;
}
n = 0;
while (isdigit(*p))
{