change some parameters in the library to meet the needs of the website httpbin.org
Fork of MiniTLS-GPL by
math/addsub/fp_add.c@5:95f70ebfe61f, 2015-02-06 (annotated)
- Committer:
- shiyilei
- Date:
- Fri Feb 06 06:17:33 2015 +0000
- Revision:
- 5:95f70ebfe61f
- Parent:
- 0:35aa5be3b78d
change some parameters in the library to meet the needs of httpbin.org
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MiniTLS | 0:35aa5be3b78d | 1 | /* TomsFastMath, a fast ISO C bignum library. |
MiniTLS | 0:35aa5be3b78d | 2 | * |
MiniTLS | 0:35aa5be3b78d | 3 | * This project is meant to fill in where LibTomMath |
MiniTLS | 0:35aa5be3b78d | 4 | * falls short. That is speed ;-) |
MiniTLS | 0:35aa5be3b78d | 5 | * |
MiniTLS | 0:35aa5be3b78d | 6 | * This project is public domain and free for all purposes. |
MiniTLS | 0:35aa5be3b78d | 7 | * |
MiniTLS | 0:35aa5be3b78d | 8 | * Tom St Denis, tomstdenis@gmail.com |
MiniTLS | 0:35aa5be3b78d | 9 | */ |
MiniTLS | 0:35aa5be3b78d | 10 | #include <tfm.h> |
MiniTLS | 0:35aa5be3b78d | 11 | |
MiniTLS | 0:35aa5be3b78d | 12 | void fp_add(fp_int *a, fp_int *b, fp_int *c) |
MiniTLS | 0:35aa5be3b78d | 13 | { |
MiniTLS | 0:35aa5be3b78d | 14 | int sa, sb; |
MiniTLS | 0:35aa5be3b78d | 15 | |
MiniTLS | 0:35aa5be3b78d | 16 | /* get sign of both inputs */ |
MiniTLS | 0:35aa5be3b78d | 17 | sa = a->sign; |
MiniTLS | 0:35aa5be3b78d | 18 | sb = b->sign; |
MiniTLS | 0:35aa5be3b78d | 19 | |
MiniTLS | 0:35aa5be3b78d | 20 | /* handle two cases, not four */ |
MiniTLS | 0:35aa5be3b78d | 21 | if (sa == sb) { |
MiniTLS | 0:35aa5be3b78d | 22 | /* both positive or both negative */ |
MiniTLS | 0:35aa5be3b78d | 23 | /* add their magnitudes, copy the sign */ |
MiniTLS | 0:35aa5be3b78d | 24 | c->sign = sa; |
MiniTLS | 0:35aa5be3b78d | 25 | s_fp_add (a, b, c); |
MiniTLS | 0:35aa5be3b78d | 26 | } else { |
MiniTLS | 0:35aa5be3b78d | 27 | /* one positive, the other negative */ |
MiniTLS | 0:35aa5be3b78d | 28 | /* subtract the one with the greater magnitude from */ |
MiniTLS | 0:35aa5be3b78d | 29 | /* the one of the lesser magnitude. The result gets */ |
MiniTLS | 0:35aa5be3b78d | 30 | /* the sign of the one with the greater magnitude. */ |
MiniTLS | 0:35aa5be3b78d | 31 | if (fp_cmp_mag (a, b) == FP_LT) { |
MiniTLS | 0:35aa5be3b78d | 32 | c->sign = sb; |
MiniTLS | 0:35aa5be3b78d | 33 | s_fp_sub (b, a, c); |
MiniTLS | 0:35aa5be3b78d | 34 | } else { |
MiniTLS | 0:35aa5be3b78d | 35 | c->sign = sa; |
MiniTLS | 0:35aa5be3b78d | 36 | s_fp_sub (a, b, c); |
MiniTLS | 0:35aa5be3b78d | 37 | } |
MiniTLS | 0:35aa5be3b78d | 38 | } |
MiniTLS | 0:35aa5be3b78d | 39 | } |
MiniTLS | 0:35aa5be3b78d | 40 | |
MiniTLS | 0:35aa5be3b78d | 41 | /* $Source: /cvs/libtom/tomsfastmath/src/addsub/fp_add.c,v $ */ |
MiniTLS | 0:35aa5be3b78d | 42 | /* $Revision: 1.1 $ */ |
MiniTLS | 0:35aa5be3b78d | 43 | /* $Date: 2006/12/31 21:25:53 $ */ |