Locally invariant string processing with strtod strtof atof printf?

Question

Are there any plans to add versions of the string processing functions of the C standard library that are invariant in the current language?

There are currently a lot of fragile workarounds, for example from jansson / strconv.c:

static void to_locale(strbuffer_t *strbuffer)
{
    const char *point;
    char *pos;

    point = localeconv()->decimal_point;
    if(*point == '.') {
        /* No conversion needed */
        return;
    }

    pos = strchr(strbuffer->value, '.');
    if(pos)
        *pos = *point;
}

static void from_locale(char *buffer)
{
    const char *point;
    char *pos;

    point = localeconv()->decimal_point;
    if(*point == '.') {
        /* No conversion needed */
        return;
    }

    pos = strchr(buffer, *point);
    if(pos)
        *pos = '.';
}

These functions pre-process their input, so it can be used regardless of the current locale under the assumption

• So that the separator is one byte
• No call setlocaleoccurs between these repair functions and the call to any of the affected functions.
• String can be changed before conversion

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Update:

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Answer 1

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int
fprintf_l(FILE * restrict stream, locale_t loc, const char * restrict format, ...);

int
printf_l(locale_t loc, const char * restrict format, ...);

int
snprintf_l(char * restrict str, size_t size, locale_t loc, const char * restrict format, ...);

int
sprintf_l(char * restrict str, locale_t loc, const char * restrict format, ...);

int
fscanf_l(FILE * restrict stream, locale_t loc, const char * restrict format, ...);

int
scanf_l(locale_t loc, const char * restrict format, ...);

int
sscanf_l(const char * restrict str, locale_t loc, const char * restrict format, ...);

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int   isalpha_l(int, locale_t);

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