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diff --git a/src/strtol.c b/src/strtol.c
new file mode 100644
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+/***********************************************************
+Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
+Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/*
+** strtol
+** This is a general purpose routine for converting
+** an ascii string to an integer in an arbitrary base.
+** Leading white space is ignored, if 'base' is zero
+** it looks for a leading 0, 0x or 0X to tell which
+** base. If these are absent it defaults to 10.
+** Base must be between 0 and 36.
+** If 'ptr' is non-NULL it will contain a pointer to
+** the end of the scan.
+** Errors due to bad pointers will probably result in
+** exceptions - we don't check for them.
+*/
+
+#include "ctype.h"
+
+long
+strtol(str, ptr, base)
+register char * str;
+char ** ptr;
+int base;
+{
+ register long result; /* return value of the function */
+ register int c; /* current input character */
+ int minus; /* true if a leading minus was found */
+
+ result = 0;
+ minus = 0;
+
+/* catch silly bases */
+ if (base < 0 || base > 36)
+ {
+ if (ptr)
+ *ptr = str;
+ return result;
+ }
+
+/* skip leading white space */
+ while (*str && isspace(*str))
+ str++;
+
+/* check for optional leading minus sign */
+ if (*str == '-')
+ {
+ minus = 1;
+ str++;
+ }
+
+/* check for leading 0 or 0x for auto-base or base 16 */
+ switch (base)
+ {
+ case 0: /* look for leading 0, 0x or 0X */
+ if (*str == '0')
+ {
+ str++;
+ if (*str == 'x' || *str == 'X')
+ {
+ str++;
+ base = 16;
+ }
+ else
+ base = 8;
+ }
+ else
+ base = 10;
+ break;
+
+ case 16: /* skip leading 0x or 0X */
+ if (*str == '0' && (*(str+1) == 'x' || *(str+1) == 'X'))
+ str += 2;
+ break;
+ }
+
+/* do the conversion */
+ while (c = *str)
+ {
+ if (isdigit(c) && c - '0' < base)
+ c -= '0';
+ else
+ {
+ if (isupper(c))
+ c = tolower(c);
+ if (c >= 'a' && c <= 'z')
+ c -= 'a' - 10;
+ else /* non-"digit" character */
+ break;
+ if (c >= base) /* non-"digit" character */
+ break;
+ }
+ result = result * base + c;
+ str++;
+ }
+
+/* set pointer to point to the last character scanned */
+ if (ptr)
+ *ptr = str;
+ return minus ? -result : result;
+}