third_party/ulib/musl/src/stdlib/strtol.c

#include "intscan.h"
#include "libc.h"
#include "shgetc.h"
#include "stdio_impl.h"
#include <ctype.h>
#include <inttypes.h>
#include <limits.h>

static unsigned long long strtox(const char* s, char** p, int base, unsigned long long lim) {
    /* FIXME: use a helper function or macro to setup the FILE */
    FILE f;
    f.flags = 0;
    f.buf = f.rpos = (void*)s;
    if ((size_t)s > (size_t)-1 / 2)
        f.rend = (void*)-1;
    else
        f.rend = (unsigned char*)s + (size_t)-1 / 2;
    f.lock = -1;
    shlim(&f, 0);
    unsigned long long y = __intscan(&f, base, 1, lim);
    if (p) {
        size_t cnt = shcnt(&f);
        *p = (char*)s + cnt;
    }
    return y;
}

unsigned long long strtoull(const char* restrict s, char** restrict p, int base) {
    return strtox(s, p, base, ULLONG_MAX);
}

long long strtoll(const char* restrict s, char** restrict p, int base) {
    return strtox(s, p, base, LLONG_MIN);
}

unsigned long strtoul(const char* restrict s, char** restrict p, int base) {
    return strtox(s, p, base, ULONG_MAX);
}

long strtol(const char* restrict s, char** restrict p, int base) {
    return strtox(s, p, base, 0UL + LONG_MIN);
}

intmax_t strtoimax(const char* restrict s, char** restrict p, int base) {
    return strtoll(s, p, base);
}

uintmax_t strtoumax(const char* restrict s, char** restrict p, int base) {
    return strtoull(s, p, base);
}