fp_cmp_d.c

00001 /* TomsFastMath, a fast ISO C bignum library.
00002  * 
00003  * This project is meant to fill in where LibTomMath
00004  * falls short.  That is speed ;-)
00005  *
00006  * This project is public domain and free for all purposes.
00007  * 
00008  * Tom St Denis, tomstdenis@gmail.com
00009  */
00010 #include <tfm.h>
00011 
00012 /* compare against a single digit */
00013 int fp_cmp_d(fp_int *a, fp_digit b)
00014 {
00015   /* compare based on sign */
00016   if ((b && a->used == 0) || a->sign == FP_NEG) {
00017     return FP_LT;
00018   }
00019 
00020   /* compare based on magnitude */
00021   if (a->used > 1) {
00022     return FP_GT;
00023   }
00024 
00025   /* compare the only digit of a to b */
00026   if (a->dp[0] > b) {
00027     return FP_GT;
00028   } else if (a->dp[0] < b) {
00029     return FP_LT;
00030   } else {
00031     return FP_EQ;
00032   }
00033 
00034 }
00035 
00036 /* $Source: /cvs/libtom/tomsfastmath/src/addsub/fp_cmp_d.c,v $ */
00037 /* $Revision: 1.1 $ */
00038 /* $Date: 2006/12/31 21:25:53 $ */