From 3568412f8f230774d0d11d7ed1c897424f95d3ef Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano.tronto@gmail.com>
Date: Thu, 11 Nov 2021 21:37:34 +0100
Subject: Rewritten from scratch. Welocme nissy 2.0!

---
 src/main.c | 937 -------------------------------------------------------------
 1 file changed, 937 deletions(-)
 delete mode 100644 src/main.c

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
deleted file mode 100644
index a14e365..0000000
--- a/src/main.c
+++ /dev/null
@@ -1,937 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-#include "utils.h"
-#include "coordinates.h"
-#include "io.h"
-#include "moves.h"
-#include "solver.h"
-#include "string.h"
-#include "helppages.h"
-/* Saved sequences of moves */
-int scr_count=1, tmp_count=1, max_tmp=999;
-int scrambles[255][255], tmp[1000][255];
-
-int read_moves_from_variable(char *id, int *dst) {
-  char c = id[0];
-  if (c != '$' && c != '@')
-    return -1;
-  int n = atoi(id+1);
-  if (n <= 0 || n >= (c == '$' ? scr_count : tmp_count))
-    return -1;
-  copy_moves(c == '$' ? scrambles[n] : tmp[n], dst);
-  return n;
-}
-
-int read_moves_from_argument(int n, char tok[][100], int *dst) {
-  int r = read_moves_from_variable(tok[0], dst);
-  return  (r != -1) ? r : read_moves_from_tok(n, tok, dst);
-}
-
-void print_results(int n, int res[][30]) {
-  if (n == -1)
-    printf("Pre-conditions not satisfied (or other error).\n");
-
-  if (n == 0)
-    printf("No result found (try different bounds).\n");
-
-  if (n > 1)
-    printf("Found %d results.\n", n);
-  tmp_count = 1; /* Reset temporary count */
-  for (int i = 0; i < n; i++) {
-    if (i < max_tmp) {
-      copy_moves(res[i], tmp[tmp_count]);
-      printf("@%d:\t", tmp_count++);
-    } else {
-      printf("  \t");
-    }
-    print_moves(res[i]);
-    printf("(%d)\n", len(res[i]));
-  }
-}
-
-/* Removes extra white spaces from the input string */
-int parsecmd(char *cmd, char cmdtok[][100])  {
-  char *i = cmd, *j = cmd;
-  while (*j != '\n' && *j != EOF) {
-    *i = *j;
-    if (*i == ' ' || *i == '\t')
-      *i = ' ';
-    ++j;
-    if (*i == ' ' || *i == '\t')
-      while (*j == ' ' || *j == '\t')
-        ++j;
-    ++i;
-  }
-  if (*(i-1) == ' ')
-    *(i-1) = 0;
-  else
-    *i = 0;
-  
-  int n = 0;
-  char *s = strtok(cmd, " ");
-  while (s != NULL) {
-    strcpy(cmdtok[n++], s);
-    s = strtok(NULL, " ");
-  }
-  return n;
-}
-
-void scramble_cmd(int n, char cmdtok[][100]) {
-  int c = 0, e = 0, dr = 0;
-
-  if (n > 2 || cmdtok[0][0] != 's') { /* Second case avoids warning */
-    printf("scramble: wrong syntax\n");
-    return;
-  } else if (n == 2) {
-    if (!strcmp(cmdtok[1], "c")) {
-      c = 1;
-    } else if (!strcmp(cmdtok[1], "e")) {
-      e = 1;
-    } else if (!strcmp(cmdtok[1], "dr")) {
-      dr = 1;
-    } else {
-      printf("scramble: wrong syntax\n");
-      return;
-    }
-  }
-
-  int scram[2][30];
-  
-  srand(time(NULL));
-  int eofb = rand() % pow2to11;
-  int coud = rand() % pow3to7;
-  int ep   = rand() % factorial12;
-  int cp   = rand() % factorial8;
-  
-  if (c) {
-    eofb = ep = 0;
-  } else if (e) {
-    coud = cp = 0;
-  } else if (dr) {
-    eofb = coud = 0;
-    int epud = rand() % factorial8;
-    int epe  = rand() % factorial4;
-    int ep_arr[12];
-    epud_int_to_array(epud, ep_arr);
-    epe_int_to_array(epe, ep_arr);
-    ep = ep_array_to_int(ep_arr);
-    while (perm_sign_int(ep, 12) != perm_sign_int(cp, 8))
-      cp = (cp+1) % factorial8;
-  } else {
-    while (perm_sign_int(ep, 12) != perm_sign_int(cp, 8))
-      cp = (cp+1) % factorial8;
-  }
-
-  reach_state(eofb, coud, ep, cp, scram);
-  /* Debug */
-  /* printf("State: %d %d %d %d\n", eofb, coud, ep, cp); */
-  print_results(1, scram);
-}
-
-void save_cmd(int n, char cmdtok[][100]) {
-  int scram[255];
-  if (n == 1) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("save: error reading moves. Not saved.\n");
-      return;
-    }
-  } else if (read_moves_from_argument(n-1, cmdtok+1, scram) == -1) {
-    printf("save: error reading moves or ID. Not saved.\n");
-    return;
-  }
-
-  copy_moves(scram, scrambles[scr_count]);
-
-  printf("$%d:\t", scr_count);
-  print_moves(scrambles[scr_count]);
-  printf("\n");
-  scr_count++;
-}
-
-void change_cmd(int n, char cmdtok[][100]) {
-  int id, scram[255];
-  if (n == 1) {
-    printf("change: you must specify an $ID.\n");
-    return;
-  } else if (cmdtok[1][0] != '$') {
-    printf("change: invalid $ID.\n");
-    return;
-  } else {
-    id = atoi(cmdtok[1]+1);
-    if (id <= 0 || id >= scr_count) {
-      printf("change: invalid $ID.\n");
-      return;
-    }
-    if (n == 2) {
-      if (read_moves_from_prompt(scram) == -1) {
-        printf("change: error reading moves.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-2, cmdtok+2, scram) == -1 ) {
-      printf("change: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  copy_moves(scram, scrambles[id]);
-
-  printf("$%d:\t", id);
-  print_moves(scrambles[id]);
-  printf("\n");
-}
-
-void print_cmd(int n, char cmdtok[][100]) {
-  if (n == 1) {
-    for (int i = 1; i < scr_count; i++) {
-      printf("$%d:\t", i);
-      print_moves(scrambles[i]);
-      printf("\n");
-    }
-  } else if (n == 2) {
-    int i = atoi(cmdtok[1]+1);
-    char sign = cmdtok[1][0];
-    if (sign != '$' && sign != '@') {
-      printf("print: invalid ID (must start with $ or @).\n");
-      return;
-    }
-    if (i > 0 && i < (sign == '$' ? scr_count : tmp_count)) {
-      printf("%c%d:\t", sign, i);
-      print_moves(sign == '$' ? scrambles[i] : tmp[i]);
-      printf("\n");
-    } else {
-      printf("print: invalid ID.\n");
-      return;
-    }
-  } else {
-    printf("print: wrong syntax.\n");
-  }
-}
-
-void add_cmd(int n, char cmdtok[][100]) {
-  int id, scram[255];
-  if (n == 1) {
-    printf("add: you must specify a destination $ID.\n");
-    return;
-  } else if (cmdtok[n-1][0] != '$') {
-    printf("add: invalid destination $ID.\n");
-    return;
-  } else {
-    id = atoi(cmdtok[n-1]+1);
-    if (id <= 0 || id >= scr_count) {
-      printf("add: invalid destination $ID.\n");
-      return;
-    }
-    if (n == 2) {
-      if (read_moves_from_prompt(scram) == -1) {
-        printf("add: error reading moves.\n");
-        return;
-      }
-    } else {
-      if (read_moves_from_argument(n-2, cmdtok+1, scram) == -1) {
-        printf("add: error reading moves or ID.\n");
-        return;
-      }
-    }
-  }
-
-  append_moves(scram, scrambles[id]);
-
-  printf("$%d:\t", id);
-  print_moves(scrambles[id]);
-  printf("\n");
-}
-
-void invert_cmd(int n, char cmdtok[][100]) {
-  int scram[255];
-  if (n == 1) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("invert: error reading moves.\n");
-      return;
-    }
-  } else if (read_moves_from_argument(n-1, cmdtok+1, scram) == -1) {
-    printf("invert: error reading moves or ID.\n");
-    return;
-  }
-
-  if (uses_niss(scram)) {
-    printf("invert: cannot invert NISS.\n");
-    return;
-  }
-
-  invert(scram, tmp[1]);
-  tmp_count = 2;
-
-  printf("@1:\t");
-  print_moves(tmp[1]);
-  printf("\n");
-}
-
-void unniss_cmd(int n, char cmdtok[][100]) {
-  int scram[255];
-  if (n == 1) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("unniss: error reading moves.\n");
-      return;
-    }
-  } else if (read_moves_from_argument(n-1, cmdtok+1, scram) == -1) {
-    printf("unniss: error reading moves or ID.\n");
-    return;
-  }
-  
-  unniss(scram, tmp[1]);
-  tmp_count = 2;
-
-  printf("@1:\t");
-  print_moves(tmp[1]);
-  printf("\n");
-}
-
-void pic_cmd(int n, char cmdtok[][100]) {
-  int scram[255];
-  if (n == 1) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("pic: error reading moves.\n");
-      return;
-    }
-  } else if (read_moves_from_argument(n-1, cmdtok+1, scram) == -1) {
-    printf("pic: error reading moves or ID.\n");
-    return;
-  }
-  print_cube_scram(scram);
-}
-
-void solve_cmd(int n, char cmdtok[][100]) {
-  int m = 1, b = 25, optimal = 0;
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("solve: bad option b.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-          printf("solve: bad option n.\n");
-        return;
-      }
-    } else if (!strcmp(cmdtok[i], "o")) {
-      optimal = 1;
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("solve: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("solve: error reading moves.\n");
-      return;
-    }
-  }
-
-  /* Call solver and print results */
-  unniss(scram, scram_unnissed);
-  int sol[m+2][30];
-  int s = solve_scram(scram_unnissed, sol, m, b, optimal);
-  print_results(s, sol);
-}
-
-void replace_cmd(int n, char cmdtok[][100]) {
-  int m = 10; /* max length */
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strncmp(cmdtok[i], "b=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-          printf("replace: bad option n.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("replace: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("replace: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-  int l = len(scram_unnissed);
-  int aux1[255], aux2[15][30], aux3[30];
-  for (int i = 0; i < l; i++) {
-    for (int j = 2; j <= m && i + j <= l; j++) {
-      copy_moves(scram_unnissed+i, aux1);
-      aux1[j] = 0;
-      int s = solve_scram(aux1, aux2, 10, j-1, 1);
-      for (int k = 0; k < s; k++) {
-        invert(aux2[k], aux3);
-        /* TODO: the following part should also chek for the case when
-         * the last moves are R L or similar. */
-        if (aux3[0] != aux1[0] && aux3[len(aux3)-1] != aux1[len(aux1)-1]) {
-          printf("Replace [ ");
-          print_moves(aux1);
-          printf("] (moves %d-%d) with: [ ", i+1, i+j);
-          print_moves(aux3);
-          printf("] (-%d+%d)\n", j, len(aux3));
-        }
-      }
-    }
-  }
-}     
-
-void clear_cmd(int n, char cmdtok[][100]) {
-  if (n > 1 || cmdtok[0][0] != 'c') {  /* Avoid unused variable warning */
-    printf("clear: syntax error.\n");
-    return;
-  }
-  scr_count = tmp_count = 1;
-}
-
-void eo_cmd(int n, char cmdtok[][100]) {
-  
-  /* Default values */
-  int m = 1, b = 20;
-  int niss = 0, hide = 1;
-  int fb = 1, rl = 1, ud = 1;
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-  
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strcmp(cmdtok[i], "h")) {
-      hide = 0;
-    } else if (!strcmp(cmdtok[i], "niss")) {
-      niss = 1;
-    } else if (!strncmp(cmdtok[i], "axis=", 5)) {
-      fb = rl = ud = 0;
-      if (strstr(cmdtok[i], "fb") != NULL)
-        fb = 1;
-      if (strstr(cmdtok[i], "rl") != NULL)
-        rl = 1;
-      if (strstr(cmdtok[i], "ud") != NULL)
-        ud = 1;
-      if (fb + rl + ud == 0) {
-        printf("eo: bad axis option.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-        printf("eo: bad option n.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("eo: bad option b.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("eo: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("eo: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-
-  /* Call solver and print results */
-  int eo_list[m+5][30];
-  int neo = eo_scram_spam(scram_unnissed, eo_list, fb, rl, ud, m, b, niss,
-                          hide);
-  print_results(neo, eo_list);
-}
-
-void co_cmd(int n, char cmdtok[][100]) {
-  
-  /* Default values */
-  int m = 1, b = 20, ignore = 0;
-  int niss = 0, hide = 1;
-  int fb = 1, rl = 1, ud = 1;
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-  
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strcmp(cmdtok[i], "h")) {
-      hide = 0;
-    } else if (!strcmp(cmdtok[i], "niss")) {
-      niss = 1;
-    } else if (!strcmp(cmdtok[i], "i")) {
-      ignore = 1;
-    } else if (!strncmp(cmdtok[i], "axis=", 5)) {
-      fb = rl = ud = 0;
-      if (strstr(cmdtok[i], "fb") != NULL)
-        fb = 1;
-      if (strstr(cmdtok[i], "rl") != NULL)
-        rl = 1;
-      if (strstr(cmdtok[i], "ud") != NULL)
-        ud = 1;
-      if (fb + rl + ud == 0) {
-        printf("co: bad axis option.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-        printf("co: bad option n.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("co: bad option b.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("co: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("co: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-
-  /* Call solver and print results */
-  int co_list[m+5][30];
-  int nco = co_scram_spam(scram_unnissed, co_list, fb, rl, ud, m, b, niss,
-                          hide, ignore);
-  print_results(nco, co_list);
-}
-
-void dr_cmd(int n, char cmdtok[][100]) {
-  
-  /* Default values */
-  int m = 1, b = 20;
-  int niss = 0, hide = 1;
-  int from = 0; /* 0: direct dr; {1,2,3}: from {eofb,eorl,eoud} */
-  int fb = 1, rl = 1, ud = 1;
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-  
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strcmp(cmdtok[i], "h")) {
-      hide = 0;
-    } else if (!strcmp(cmdtok[i], "niss")) {
-      niss = 1;
-    } else if (!strncmp(cmdtok[i], "axis=", 5)) {
-      fb = rl = ud = 0;
-      if (strstr(cmdtok[i], "fb") != NULL)
-        fb = 1;
-      if (strstr(cmdtok[i], "rl") != NULL)
-        rl = 1;
-      if (strstr(cmdtok[i], "ud") != NULL)
-        ud = 1;
-      if (fb + rl + ud == 0) {
-        printf("dr: bad axis option.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-        printf("dr: bad option n.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("dr: bad option b.\n");
-        return;
-      }
-    } else if (!strcmp(cmdtok[i], "from")) {
-      i++;
-      char x[3][3] = {"fb", "rl", "ud"};
-      for (int j = 0; j < 3; j++)
-        if (!strcmp(cmdtok[i], x[j]))
-          from = j+1;
-      if (!from) {
-        printf("dr: bad from option.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("dr: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("dr: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-
-  /* Call solver */
-  int dr_list[m+5][30], ndr;
-  if (from) {
-    ndr = drfrom_scram_spam(scram_unnissed, dr_list, from, fb, rl, ud,
-                            m, b, niss, hide);
-    if (ndr == -1) {
-      printf("dr: from given, but EO not found (possibly other error).\n");
-      return;
-    }
-  } else {
-    if (niss)
-      printf("Warning: not using NISS for direct DR.\n");
-    ndr = dr_scram_spam(scram_unnissed, dr_list, fb, rl, ud, m, b, hide);
-  }
-  print_results(ndr, dr_list);
-}
-
-void htr_cmd(int n, char cmdtok[][100]) {
-
-  /* Default values */
-  int m = 1, b = 20;
-  int niss = 0, hide = 1;
-  int from = 0; /* 0: unspecified; {1,2,3}: from {ud,fb,rl} */
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strcmp(cmdtok[i], "h")) {
-      hide = 0;
-    } else if (!strcmp(cmdtok[i], "niss")) {
-      niss = 1;
-    } else if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-        printf("htr: bad option n.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("htr: bad option b.\n");
-        return;
-      }
-    } else if (!strcmp(cmdtok[i], "from")) {
-      i++;
-      char x[3][3] = {"ud", "fb", "rl"};
-      for (int j = 0; j < 3; j++)
-        if (!strcmp(cmdtok[i], x[j]))
-          from = j+1;
-      if (!from) {
-        printf("htr: bad from option.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("htr: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("htr: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-
-  /* Call solver */
-  int htr_list[m+5][30], nhtr;
-  nhtr = htr_scram_spam(scram_unnissed, htr_list, from, m, b, niss, hide);
-  print_results(nhtr, htr_list);
-}
-
-void drfinish_cmd(int n, char cmdtok[][100]) {
-  /* Default values */
-  int m = 1, b = 20;
-  int from = 0; /* 0: unspecified; {1,2,3}: from {ud,fb,rl} */
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-        printf("drfinish: bad option n.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("drfinish: bad option b.\n");
-        return;
-      }
-    } else if (!strcmp(cmdtok[i], "from")) {
-      i++;
-      char x[3][3] = {"ud", "fb", "rl"};
-      for (int j = 0; j < 3; j++)
-        if (!strcmp(cmdtok[i], x[j]))
-          from = j+1;
-      if (!from) {
-        printf("drfinish: bad from option.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("drfinish: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("drfinish: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-  
-  /* Call solver */
-  int c_list[m+5][30], nc;
-  nc = dr_finish_scram_spam(scram_unnissed, c_list, from, m, b);
-  print_results(nc, c_list);
-}
-
-void htrfinish_cmd(int n, char cmdtok[][100]) {
-  /* Default values */
-  int m = 1, b = 20;
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-        printf("htrfinish: bad option n.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("htrfinish: bad option b.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("htrfinish: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("htrfinish: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-  
-  /* Call solver */
-  int c_list[m+5][30], nc;
-  nc = htr_finish_scram_spam(scram_unnissed, c_list, m, b);
-  print_results(nc, c_list);
-}
-
-void drcorners_cmd(int n, char cmdtok[][100]) {
-  /* Default values */
-  int m = 1, b = 20, ignore = 0;
-  int from = 0; /* 0: unspecified; {1,2,3}: from {ud,fb,rl} */
-  int scram[255] = {[0] = 0};
-  int scram_unnissed[255];
-
-  /* Parse options */
-  for (int i = 1; i < n && scram[0] == 0; i++) {
-    if (!strncmp(cmdtok[i], "n=", 2)) {
-      m = atoi(cmdtok[i]+2);
-      if (m <= 0) {
-        printf("drcorners: bad option n.\n");
-        return;
-      }
-    } else if (!strncmp(cmdtok[i], "b=", 2)) {
-      b = atoi(cmdtok[i]+2);
-      if (b <= 0) {
-        printf("drcorners: bad option b.\n");
-        return;
-      }
-    } else if (!strcmp(cmdtok[i], "i")) {
-      ignore = 1;
-    } else if (!strcmp(cmdtok[i], "from")) {
-      i++;
-      char x[3][3] = {"ud", "fb", "rl"};
-      for (int j = 0; j < 3; j++)
-        if (!strcmp(cmdtok[i], x[j]))
-          from = j+1;
-      if (!from) {
-        printf("drcorners: bad from option.\n");
-        return;
-      }
-    } else if (read_moves_from_argument(n-i, cmdtok+i, scram) == -1) {
-      printf("drcorners: error reading moves or ID.\n");
-      return;
-    }
-  }
-
-  if (scram[0] == 0) {
-    if (read_moves_from_prompt(scram) == -1) {
-      printf("drcorners: error reading moves.\n");
-      return;
-    }
-  }
-
-  unniss(scram, scram_unnissed);
-  
-  /* Call solver */
-  int c_list[m+5][30], nc;
-  nc = dr_corners_scram_spam(scram_unnissed, c_list, from, m, b, ignore);
-  print_results(nc, c_list);
-}
-
-
-void exit_quit_cmd(int n, char cmdtok[][100]) {
-  if (n == 1)
-    exit(0);
-  else
-    printf("%s: wrong synstax.\n", cmdtok[0]);
-}
-
-/***************************************************************/
-/* List of all commands                                        */
-/* Important: they must be in the same order in the two arrays */
-/***************************************************************/
-
-char *commands[][10] = {
-  {"help", "[COMMAND]",
-   "Print this help, or a help page for COMMAND."},
-  {"scramble", "[OPTIONS]",
-   "Prints a random-state scramble."},
-  {"save", "[MOVES|@ID|$ID]",
-   "Save or copy a scramble."},
-  {"change", "$ID1 [MOVES|$ID2|@ID2]",
-   "Change a memorized scramble."},
-  {"print", "[$ID|@ID]",
-   "Print memorized sequences."},
-  {"add", "[MOVES|$ID1|@ID1] $ID2",
-   "Add moves at the end of a memorized scramble."},
-  {"invert", "[MOVES|$ID|@ID]",
-   "Inverts the given sequence of moves."},
-  {"unniss", "[MOVES|$ID|@ID]}",
-   "Removes NISS: A (B) -> B\' A."},
-  {"pic",   "[MOVES|$ID|@ID]",
-   "Show a text description of the scrambled cube."},
-  {"solve", "[MOVES|$ID|@ID]",
-   "Solves a scramble."},
-  {"replace", "[MOVES|$ID|@ID]",
-   "Find non-optimal subsequences."},
-  {"clear", "",
-   "Delete saved scrambles and output sequences."},
-  {"eo", "[MOVES|$ID|@ID]",
-   "Solves EO."},
-  {"co", "[MOVES|$ID|@ID]",
-   "Solves CO."},
-  {"dr", "[MOVES|$ID|@ID]",
-   "Solves DR, either directly or from eo."},
-  {"htr", "[MOVES|$ID|@ID]",
-   "Solves HTR from DR."},
-  {"drfinish", "[MOVES|$ID|@ID]",
-   "Solves the cube after DR."},
-  {"htrfinish", "[MOVES|$ID|@ID]",
-   "Solves the cube using only half turns."},
-  {"drcorners", "[MOVES|$ID|@ID]",
-   "Solves corners after DR."},
-  {"exit", "",
-   "Exit nissy."},
-  {"quit", "",
-   "Exit nissy."},
-  {"", "", ""}
-};
-
-void help_cmd(int n, char cmdtok[][100]) {
-  if (n == 1) {
-    printf("\n");
-    for (int i = 0; commands[i][0][0]; i++)
-      printf("%-10s%-25s%s\n", commands[i][0], commands[i][1], commands[i][2]);
-    printf("\n");
-    printf("Type \'help\' followed by a command for a detailed help page.\n");
-    printf("Type \'help nissy\' for a general user guide.\n");
-  } else if (n == 2) {  
-    for (int i = 0; i < Npages; i++) {
-      if (!strcmp(helppages[i][0], cmdtok[1])) {
-        printf("%s", helppages[i][1]);
-        return;
-      }
-    }
-    printf("No help page for %s.\n", cmdtok[1]);
-    return;
-  } else {
-    printf("help: wrong syntax.\n");
-  }
-}
-
-void (*cmd_list[])(int n, char cmdtok[][100]) = {
-  help_cmd, scramble_cmd, save_cmd, change_cmd, print_cmd,
-  add_cmd, invert_cmd, unniss_cmd, pic_cmd,
-  solve_cmd, replace_cmd, clear_cmd,
-  eo_cmd, co_cmd, dr_cmd, htr_cmd,
-  drfinish_cmd, htrfinish_cmd, drcorners_cmd,
-  exit_quit_cmd, exit_quit_cmd, NULL
-};
-
-
-void execcmd(int n, char cmdtok[][100]) {
-  int i = 0;
-  while (strcmp(commands[i][0], cmdtok[0]) && strcmp(commands[i][0], ""))
-    i++;
-  if (strcmp(commands[i][0], ""))
-    (*cmd_list[i])(n, cmdtok);
-  else
-    printf("%s: not a command.\n", cmdtok[0]);
-}
-
-
-/* Main loop */
-
-int main() {
-  init_transition_table();
-  init_possible_next();
-
-  printf("Type help for a list of commands.\n");
-
-  char cmd[1000] = "";
-  while (1) {
-    printf("nissy-# ");
-    if (fgets(cmd, 1000, stdin) == NULL)
-      break;
-    char cmdtok[100][100];
-    int n = parsecmd(cmd, cmdtok);
-    if (n == 0)
-      continue;
-    execcmd(n, cmdtok);
-  }
-
-  return 0;
-}
-- 
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