--- /dev/null
+/* ========================================================================
+ * Copyright 1988-2006 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *
+ * ========================================================================
+ */
+
+/*
+ * Program: String to unsigned long
+ *
+ * Author: Mark Crispin
+ * Networks and Distributed Computing
+ * Computing & Communications
+ * University of Washington
+ * Administration Building, AG-44
+ * Seattle, WA 98195
+ *
+ * Date: 14 February 1995
+ * Last Edited: 30 August 2006
+ */
+\f
+/*
+ * Turn a string unsigned long into the real thing
+ * Accepts: source string
+ * pointer to place to return end pointer
+ * base
+ * Returns: parsed unsigned long integer, end pointer is updated
+ */
+
+unsigned long strtoul (char *t,char **endp,int base)
+{
+ unsigned long value = 0; /* the accumulated value */
+ int negative = 0; /* this a negative number? */
+ unsigned char c,*s = t;
+ if (base && (base < 2 || base > 36)) {
+ errno = EINVAL; /* insist upon valid base */
+ return value;
+ }
+ while (isspace (*s)) s++; /* skip leading whitespace */
+ switch (*s) { /* check for leading sign char */
+ case '-':
+ negative = 1; /* yes, negative #. fall into '+' */
+ case '+':
+ s++; /* skip the sign character */
+ }
+ if (!base) { /* base not specified? */
+ if (*s != '0') base = 10; /* must be decimal if doesn't start with 0 */
+ /* starts with 0x? */
+ else if (tolower (*++s) == 'x') {
+ base = 16; /* yes, is hex */
+ s++; /* skip the x */
+ }
+ else base = 8; /* ...or octal */
+ }
+ do { /* convert to numeric form if digit */
+ if (isdigit (*s)) c = *s - '0';
+ /* alphabetic conversion */
+ else if (isalpha (*s)) c = *s - (isupper (*s) ? 'A' : 'a') + 10;
+ else break; /* else no way it's valid */
+ if (c >= base) break; /* digit out of range for base? */
+ value = value * base + c; /* accumulate the digit */
+ } while (*++s); /* loop until non-numeric character */
+ if (tolower (*s) == 'l') s++; /* ignore 'l' or 'L' marker */
+ if (endp) *endp = s; /* save users endp to after number */
+ /* negate number if needed */
+ return negative ? -value : value;
+}