change some parameters in the library to meet the needs of the website httpbin.org
Fork of MiniTLS-GPL by
math/addsub/s_fp_sub.c
- Committer:
- shiyilei
- Date:
- 2015-02-06
- Revision:
- 5:95f70ebfe61f
- Parent:
- 0:35aa5be3b78d
File content as of revision 5:95f70ebfe61f:
/* TomsFastMath, a fast ISO C bignum library. * * This project is meant to fill in where LibTomMath * falls short. That is speed ;-) * * This project is public domain and free for all purposes. * * Tom St Denis, tomstdenis@gmail.com */ #include <tfm.h> /* unsigned subtraction ||a|| >= ||b|| ALWAYS! */ void s_fp_sub(fp_int *a, fp_int *b, fp_int *c) { int x, oldbused, oldused; fp_word t; oldused = c->used; oldbused = b->used; c->used = a->used; t = 0; for (x = 0; x < oldbused; x++) { t = ((fp_word)a->dp[x]) - (((fp_word)b->dp[x]) + t); c->dp[x] = (fp_digit)t; t = (t >> DIGIT_BIT)&1; } for (; x < a->used; x++) { t = ((fp_word)a->dp[x]) - t; c->dp[x] = (fp_digit)t; t = (t >> DIGIT_BIT); } for (; x < oldused; x++) { c->dp[x] = 0; } fp_clamp(c); } /* $Source: /cvs/libtom/tomsfastmath/src/addsub/s_fp_sub.c,v $ */ /* $Revision: 1.1 $ */ /* $Date: 2006/12/31 21:25:53 $ */