+++ /dev/null
-#include <precomp.h>
-
-/*
- * @implemented
- */
-long
-CDECL
-strtol(const char *nptr, char **endptr, int base)
-{
- const char *s = nptr;
- unsigned long acc;
- int c;
- unsigned long cutoff;
- int neg = 0, any, cutlim;
-
- /*
- * Skip white space and pick up leading +/- sign if any.
- * If base is 0, allow 0x for hex and 0 for octal, else
- * assume decimal; if base is already 16, allow 0x.
- */
- 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;
- }
- if (base == 0)
- base = c == '0' ? 8 : 10;
-
- /*
- * Compute the cutoff value between legal numbers and illegal
- * numbers. That is the largest legal value, divided by the
- * base. An input number that is greater than this value, if
- * followed by a legal input character, is too big. One that
- * is equal to this value may be valid or not; the limit
- * between valid and invalid numbers is then based on the last
- * digit. For instance, if the range for longs is
- * [-2147483648..2147483647] and the input base is 10,
- * cutoff will be set to 214748364 and cutlim to either
- * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
- * a value > 214748364, or equal but the next digit is > 7 (or 8),
- * the number is too big, and we will return a range error.
- *
- * Set any if any `digits' consumed; make it negative to indicate
- * overflow.
- */
- cutoff = neg ? ((unsigned long)LONG_MAX+1) : LONG_MAX;
- cutlim = cutoff % (unsigned long)base;
- cutoff /= (unsigned long)base;
- 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;
-#ifndef _LIBCNT_
- _set_errno(ERANGE);
-#endif
- }
- else if (neg)
- acc = 0-acc;
- if (endptr != 0)
- *endptr = any ? (char *)((size_t)(s - 1)) : (char *)((size_t)nptr);
- return acc;
-}