--- /dev/null
+/*
+ bigint.c - Manage big positive integer numbers
+ Copyright (c) 1996 Martin Schulze <joey@artis.uni-oldenburg.de>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+ */
+
+#include "bigint.h"
+#include <stdio.h>
+#include <string.h>
+#include <malloc.h>
+
+bigint bigint_add(bigint a, bigint b)
+{
+ int i;
+ unsigned long int tmp;
+ bigint c;
+
+ for (i=0; i<BIGINT_LEN; i++) {
+ tmp = a.val[i] + b.val[i];
+ if (tmp >= BIGINT_MAX) {
+ c.val[i] = tmp - BIGINT_MAX;
+ if (i<BIGINT_LEN)
+ a.val[i+1]++;
+ else
+ fprintf(stderr, "Overflow in bigint addition.");
+ } else
+ c.val[i] = tmp;
+ }
+ return c;
+}
+
+bigint bigint_sub(bigint a, bigint b)
+{
+ /* FIXME */
+ fprintf (stderr, "bigint_sub not supported yet.\n");
+ return a;
+}
+
+bigint bigint_int(int num)
+{
+ bigint x;
+ int i;
+
+ for (i=0; i<BIGINT_LEN; i++) x.val[i] = 0L;
+ x.val[0] = num;
+ x.val[1] = 0;
+ return x;
+}
+
+bigint bigint_string(char *s)
+{
+ char tmp[BIGINT_PREC+1];
+ bigint a;
+ int i;
+ char *cp, *x;
+
+ for (i=0; i<BIGINT_LEN; i++) a.val[i] = 0L;
+ if ((x = (char *)malloc(strlen(s)+1))) {
+ strcpy(x, s);
+ for (i=0; i<BIGINT_LEN; i++) {
+ if (strlen(x)) {
+ cp = x;
+ if (strlen(x) > BIGINT_PREC)
+ cp += (strlen(x) - BIGINT_PREC);
+ strcpy(tmp, cp);
+ *cp = '\0';
+ sscanf(tmp, "%lu", &a.val[i]);
+ }
+ }
+ free (x);
+ }
+
+ return a;
+}
+
+void bigint_sprintf (char *res, char *format, bigint a)
+{
+ char s[(BIGINT_PREC*BIGINT_LEN)+1];
+ char tmp[BIGINT_PREC+1];
+ char form[6];
+ int i, max;
+
+ bzero(s, sizeof(s));
+ sprintf(form, "%%0%dlu", BIGINT_PREC);
+ max = BIGINT_LEN;
+ for (;max>0 && !a.val[max-1];max--);
+ for (i=0; i<max; i++) {
+ if (i<max-1)
+ sprintf(tmp, form, a.val[i]);
+ else
+ sprintf(tmp, "%lu", a.val[i]);
+ sprintf (res, "%s%s", tmp, s);
+ sprintf (s, "%s", res);
+ }
+ sprintf (res, format, s);
+}
--- /dev/null
+/*
+ bigint.h - Manage big positive integer numbers
+ Copyright (c) 1996 Martin Schulze <joey@artis.uni-oldenburg.de>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+ */
+
+/*
+ * 4294967295 is max (unsigned long int)
+ */
+
+#define BIGINT_LEN 2
+#define BIGINT_MAX 1000000000
+#define BIGINT_PREC 9
+
+typedef struct
+{
+ unsigned long int val[BIGINT_LEN];
+} bigint;
+
+bigint bigint_add(bigint a, bigint b);
+
+bigint bigint_sub(bigint a, bigint b);
+
+bigint bigint_int(int num);
+
+bigint bigint_string(char *s);
+
+void bigint_sprintf (char *res, char *format, bigint a);