Create a branch for audio work

svn path=/branches/audio-bringup/; revision=49478

lib/sdk/crt/string/strtol.c

@@ -0,0 +1,91 @@
+#include <precomp.h>
+
+/*
+ * @implemented
+ */
+long
+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_MIN : 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 = -acc;
+  if (endptr != 0)
+    *endptr = any ? (char *)((size_t)(s - 1)) : (char *)((size_t)nptr);
+  return acc;
+}