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feat(userspace/libc): implement atoi, strtol, and strtoll functions in <stdlib.h>

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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
This commit is contained in:
EnderIce2 2025-02-20 01:49:41 +02:00
parent e5acf4a99e
commit ab4bc55270
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GPG Key ID: 2EE20AF089811A5A
2 changed files with 169 additions and 4 deletions
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5
Userspace/libc/include/stdlib.h
View File

@ -54,7 +54,7 @@ extern "C"
int abs(int i);
int atexit(void (*func)(void));
double atof(const char *);
int atoi(const char *);
int atoi(const char *str);
long int atol(const char *);
void *bsearch(const void *, const void *, size_t, size_t, int (*)(const void *, const void *));
void *calloc(size_t, size_t);
@ -100,7 +100,8 @@ extern "C"
void srand48(long int);
void srandom(unsigned);
double strtod(const char *, char **);
long int strtol(const char *, char **, int);
long strtol(const char *restrict nptr, char **restrict endptr, int base);
long long strtoll(const char *restrict nptr, char **restrict endptr, int base);
unsigned long int strtoul(const char *, char **, int);
int system(const char *);
int ttyslot(void);

168
Userspace/libc/src/std/stdlib.c
View File

@ -47,7 +47,12 @@ export int atexit(void (*func)(void))
}
export double atof(const char *);
export int atoi(const char *);
export int atoi(const char *str)
{
return (int)strtol(str, (char **)NULL, 10);
}
export long int atol(const char *);
export void *bsearch(const void *, const void *, size_t, size_t, int (*)(const void *, const void *));
export void *calloc(size_t, size_t);
@ -163,7 +168,166 @@ export void srand(unsigned int);
export void srand48(long int);
export void srandom(unsigned);
export double strtod(const char *, char **);
export long int strtol(const char *, char **, int);
export long strtol(const char *restrict nptr, char **restrict endptr, int base)
{
const char *s = nptr;
long acc = 0;
int c;
long cutoff;
int neg = 0, any, cutlim;
do
{
c = *s++;
} while (isspace(c));
if (c == '-')
{
neg = 1;
c = *s++;
}
else if (c == '+')
c = *s++;
if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X'))
{
c = s[1];
s += 2;
base = 16;
}
else if (base == 0)
base = c == '0' ? 8 : 10;
cutoff = neg ? LONG_MIN : LONG_MAX;
cutlim = cutoff % base;
cutoff /= base;
if (neg)
{
if (cutlim > 0)
{
cutlim -= base;
cutoff += 1;
}
cutlim = -cutlim;
}
for (acc = 0, any = 0;; c = *s++)
{
if (isdigit(c))
c -= '0';
else if (isalpha(c))
c -= isupper(c) ? 'A' - 10 : 'a' - 10;
else
break;
if (c >= base)
break;
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
any = -1;
else
{
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0)
{
acc = neg ? LONG_MIN : LONG_MAX;
errno = ERANGE;
}
else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (char *)(any ? s - 1 : nptr);
return acc;
}
export long long strtoll(const char *restrict nptr, char **restrict endptr, int base)
{
const char *s = nptr;
long long acc = 0;
int c;
long long cutoff;
int neg = 0, any, cutlim;
do
{
c = *s++;
} while (isspace(c));
if (c == '-')
{
neg = 1;
c = *s++;
}
else if (c == '+')
c = *s++;
if ((base == 0 || base == 16) &&
c == '0' && (*s == 'x' || *s == 'X'))
{
c = s[1];
s += 2;
base = 16;
}
else if (base == 0)
base = c == '0' ? 8 : 10;
cutoff = neg ? LLONG_MIN : LLONG_MAX;
cutlim = cutoff % base;
cutoff /= base;
if (neg)
{
if (cutlim > 0)
{
cutlim -= base;
cutoff += 1;
}
cutlim = -cutlim;
}
for (acc = 0, any = 0;; c = *s++)
{
if (isdigit(c))
c -= '0';
else if (isalpha(c))
c -= isupper(c) ? 'A' - 10 : 'a' - 10;
else
break;
if (c >= base)
break;
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
any = -1;
else
{
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0)
{
acc = neg ? LLONG_MIN : LLONG_MAX;
errno = ERANGE;
}
else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (char *)(any ? s - 1 : nptr);
return acc;
}
export unsigned long int strtoul(const char *, char **, int);
export int system(const char *);
export int ttyslot(void);