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LibC: Misc additions

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This commit is contained in:
Sergey Bugaev 2019-10-02 22:48:14 +03:00 • committed by Andreas Kling
parent 17597f4681
commit 89bf38864a
4 changed files with 40 additions and 4 deletions
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37
Libraries/LibC/stdlib.cpp
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@ -167,6 +167,8 @@ int putenv(char* new_var)
return 0;
}
}
double strtod(const char* str, char** endptr)
{
(void)str;
@ -175,6 +177,15 @@ double strtod(const char* str, char** endptr)
ASSERT_NOT_REACHED();
}
long double strtold(const char* str, char** endptr)
{
(void)str;
(void)endptr;
dbgprintf("LibC: strtold: '%s'\n", str);
ASSERT_NOT_REACHED();
}
float strtof(const char* str, char** endptr)
{
(void)str;
@ -374,7 +385,8 @@ size_t mbstowcs(wchar_t*, const char*, size_t)
ASSERT_NOT_REACHED();
}
long strtol(const char* nptr, char** endptr, int base)
template<typename T, T min_value, T max_value>
static T strtol_impl(const char* nptr, char** endptr, int base)
{
errno = 0;
@ -411,8 +423,8 @@ long strtol(const char* nptr, char** endptr, int base)
}
}
long cutoff_point = is_negative ? (LONG_MIN / base) : (LONG_MAX / base);
int max_valid_digit_at_cutoff_point = is_negative ? (LONG_MIN % base) : (LONG_MAX % base);
long cutoff_point = is_negative ? (min_value / base) : (max_value / base);
int max_valid_digit_at_cutoff_point = is_negative ? (min_value % base) : (max_value % base);
long num = 0;
@ -441,7 +453,7 @@ long strtol(const char* nptr, char** endptr, int base)
if (is_past_cutoff || (num == cutoff_point && digit > max_valid_digit_at_cutoff_point)) {
has_overflowed = true;
num = is_negative ? LONG_MIN : LONG_MAX;
num = is_negative ? min_value : max_value;
errno = ERANGE;
} else {
num *= base;
@ -459,10 +471,27 @@ long strtol(const char* nptr, char** endptr, int base)
return num;
}
long strtol(const char* str, char** endptr, int base)
{
return strtol_impl<long, LONG_MIN, LONG_MAX>(str, endptr, base);
}
unsigned long strtoul(const char* str, char** endptr, int base)
{
auto value = strtol(str, endptr, base);
ASSERT(value >= 0);
return value;
}
long long strtoll(const char* str, char** endptr, int base)
{
return strtol_impl<long long, LONG_LONG_MIN, LONG_LONG_MAX>(str, endptr, base);
}
unsigned long long strtoull(const char* str, char** endptr, int base)
{
auto value = strtoll(str, endptr, base);
ASSERT(value >= 0);
return value;
}