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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
   c83985c5ce) 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
Download Patch File Download Diff File Expand all files Collapse all files
libs/libc/stdlib/lib_strtod.c
+5 -1
View File
@@ -79,12 +79,16 @@ static inline int is_real(double x)
* Public Functions * Public Functions
****************************************************************************/ ****************************************************************************/
/***************************************************(************************ /****************************************************************************
* Name: strtod * Name: strtod
* *
* Description: * Description:
* Convert a string to a double value * 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) double strtod(FAR const char *str, FAR char **endptr)
libs/libc/stdlib/lib_strtof.c
+14 -1
View File
@@ -86,12 +86,16 @@ static inline int is_real(float x)
* Public Functions * Public Functions
****************************************************************************/ ****************************************************************************/
/***************************************************(************************ /****************************************************************************
* Name: strtof * Name: strtof
* *
* Description: * Description:
* Convert a string to a float value * 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) 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); set_errno(ERANGE);
number = 0.0F; number = 0.0F;
p = (FAR char *)str;
goto errout; goto errout;
} }
@@ -208,6 +213,14 @@ float strtof(FAR const char *str, FAR char **endptr)
/* Process string of digits */ /* Process string of digits */
if (!isdigit(*p))
{
set_errno(ERANGE);
number = 0.0F;
p = (FAR char *)str;
goto errout;
}
n = 0; n = 0;
while (isdigit(*p)) while (isdigit(*p))
{ {
libs/libc/stdlib/lib_strtold.c
+14 -1
View File
@@ -79,12 +79,16 @@ static inline int is_real(long double x)
* Public Functions * Public Functions
****************************************************************************/ ****************************************************************************/
/***************************************************(************************ /****************************************************************************
* Name: strtold * Name: strtold
* *
* Description: * Description:
* Convert a string to a long double value * 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) 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); set_errno(ERANGE);
number = 0.0L; number = 0.0L;
p = (FAR char *)str;
goto errout; goto errout;
} }
@@ -195,6 +200,14 @@ long double strtold(FAR const char *str, FAR char **endptr)
/* Process string of digits */ /* Process string of digits */
if (!isdigit(*p))
{
set_errno(ERANGE);
number = 0.0L;
p = (FAR char *)str;
goto errout;
}
n = 0; n = 0;
while (isdigit(*p)) while (isdigit(*p))
{ {