syntax sugar

[proxmark3-svn] / client / reveng / cli.c

diff --git a/client/reveng/cli.c b/client/reveng/cli.c
index fe1155d4b2abb5d7bedff38a30736cbe5fa8a9b4..5b91c3dce77504400590c7455f689412dc5966d0 100644 (file)
--- a/client/reveng/cli.c
+++ b/client/reveng/cli.c
@@ -1,9 +1,9 @@
 /* cli.c
- * Greg Cook, 9/Apr/2015
+ * Greg Cook, 27/Jun/2016
  */
 
-/* CRC RevEng, an arbitrary-precision CRC calculator and algorithm finder
- * Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015  Gregory Cook
+/* CRC RevEng: arbitrary-precision CRC calculator and algorithm finder
+ * Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016  Gregory Cook
  *
  * This file is part of CRC RevEng.
  *
@@ -18,10 +18,11 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with CRC RevEng.  If not, see <http://www.gnu.org/licenses/>.
+ * along with CRC RevEng.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-/* 2015-04-03: added -z
+/* 2016-06-27: -P sets width like -k
+ * 2015-04-03: added -z
  * 2013-09-16: do not search with -M
  * 2013-06-11: uprog() suppresses first progress report
  * 2013-04-22: uprog() prints poly same as mtostr()
@@ -156,13 +157,16 @@ int reveng_main(int argc, char *argv[]) {
                        case 'i': /* i: Init value */
                                pptr = &model.init;
                                rflags |= R_HAVEI;
-                               goto ippx;
+                               goto ipqx;
+                       case 'P': /* P: reversed polynomial */
                        case 'k': /* k: polynomial in Koopman notation */
                                pfree(&model.spoly);
                                model.spoly = strtop(optarg, 0, 4);
                                pkchop(&model.spoly);
                                width = plen(model.spoly);
                                rflags |= R_HAVEP;
+                               if(c == 'P')
+                                       prcp(&model.spoly);
                                mnovel(&model);
                                break;
                        case 'l': /* l  little-endian input and output */
@@ -194,24 +198,21 @@ int reveng_main(int argc, char *argv[]) {
                        case 'M': /* M  non-augmenting algorithm */
                                model.flags &= ~P_MULXN;
                                break;
-                       case 'P': /* P: reversed polynomial */
                        case 'p': /* p: polynomial */
                                pptr = &model.spoly;
                                rflags &= ~R_HAVEQ;
                                rflags |= R_HAVEP;
-ippx:
+ipqx:
                                pfree(pptr);
                                *pptr = strtop(optarg, 0, 4);
                                pright(pptr, width);
-                               if(c == 'P')
-                                       prev(pptr);
                                mnovel(&model);
                                break;
                        case 'q': /* q: range end polynomial */
                                pptr = &qpoly;
                                rflags &= ~R_HAVEP;
                                rflags |= R_HAVEQ;
-                               goto ippx;
+                               goto ipqx;
                        case 'S': /* s  space between output characters */
                                model.flags |= P_SPACE;
                                break;
@@ -224,6 +225,7 @@ ippx:
                                mrev(&model);
                                break;
                        case 'w': /* w: CRC width = order - 1 */
+                               /* no validation, WONTFIX */
                                width = (unsigned long) atol(optarg);
                                break;
                        case 'X': /* X  print uppercase hex */
@@ -232,7 +234,7 @@ ippx:
                        case 'x': /* x: XorOut value */
                                pptr = &model.xorout;
                                rflags |= R_HAVEX;
-                               goto ippx;
+                               goto ipqx;
                        case 'y': /* y  little-endian byte order in files */
                                model.flags |= P_LTLBYT;
                                break;
@@ -444,7 +446,7 @@ ippx:
                        if(uflags & C_RESULT) {
                                for(qptr = apolys; qptr < pptr; ++qptr)
                                        pfree(qptr);
-                               //return 1;
+                               return 1;
                                //exit(EXIT_SUCCESS);
                        }
                        if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT)){
@@ -571,7 +573,7 @@ static void
 usage(void) {
        /* print usage if asked, or if syntax incorrect */
        fprintf(stderr,
-                       "CRC RevEng, an arbitrary-precision CRC calculator and algorithm finder\n"
+                       "CRC RevEng: arbitrary-precision CRC calculator and algorithm finder\n"
                        "Usage:\t");
        fputs(myname, stderr);
        fprintf(stderr,
@@ -586,7 +588,7 @@ usage(void) {
                        "\t-k KPOLY\tgenerator in Koopman notation (implies WIDTH)\n"
                        "\t-m MODEL\tpreset CRC algorithm\n"
                        "\t-p POLY\t\tgenerator or search range start polynomial\n"
-                       "\t-P RPOLY\treversed generator polynomial\n",
+                       "\t-P RPOLY\treversed generator polynomial (implies WIDTH)\n",
                        BMP_BIT, BMP_BIT);
        fprintf(stderr,
                        "\t-q QPOLY\tsearch range end polynomial\n"
@@ -605,9 +607,21 @@ usage(void) {
                        "\t-c calculate CRCs\t\t-d dump algorithm parameters\n"
                        "\t-D list preset algorithms\t-e echo (and reformat) input\n"
                        "\t-s search for algorithm\t\t-v calculate reversed CRCs\n"
-                       "\t-h | -u | -? show this help\n"
+                       "\t-g search for alg given hex+crc\t-h | -u | -? show this help\n"
+                       "Common Use Examples:\n"
+                       "\t   reveng -g 01020304e3\n"
+                       "\t      Searches for a known/common crc preset that computes the crc\n"
+                       "\t      on the end of the given hex string\n"
+                       "\t   reveng -w 8 -s 01020304e3 010204039d\n"
+                       "\t      Searches for any possible 8 bit width crc calc that computes\n"
+                       "\t      the crc on the end of the given hex string(s)\n"
+                       "\t   reveng -m CRC-8 -c 01020304\n"
+                       "\t      Calculates the crc-8 of the given hex string\n"
+                       "\t   reveng -D\n"
+                       "\t      Outputs a list of all known/common crc models with their\n"
+                       "\t      preset values\n"
                        "\n"
-                       "Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015  Gregory Cook\n"
+                       "Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016  Gregory Cook\n"
                        "This is free software; see the source for copying conditions.  There is NO\n"
                        "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
                        "Version "