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Annotation of 42BSD/usr.lib/learn/editor/L44.1g, revision 1.1.1.1

1.1       root        1: #print
                      2: Of course, you can also search for lines that
                      3: contain backslashes; again, it's simply a matter
                      4: of doubling the backslash in the search pattern.
                      5: That is,
                      6:    /\\/
                      7: finds the next line with a backslash.
                      8: 
                      9: Find the second occurrence of "\n\n" in the file
                     10: "prog.c", and type "answer N", where N is its
                     11: line number.
                     12: #create prog.c
                     13: 
                     14: int  nsave  = 0;
                     15: 
                     16: selunit()
                     17: {
                     18:   char fnam[20], s[50];
                     19:   static char dobuff[50];
                     20:   char posslev[20][20];
                     21:   int diff[20], i, k, m, n, best, alts, statb[20];
                     22:   FILE *f;
                     23:   char zb[200];
                     24:   static char saved[20];
                     25: 
                     26:   while (ask) {
                     27:     printf("What lesson? ");
                     28:     fflush(stdout);
                     29:     gets(dobuff);
                     30:     if (strcmp(dobuff, "bye") == 0)
                     31:       wrapup(0);
                     32:     level = todo = dobuff;
                     33:     sprintf(s, "../L%s", dobuff);
                     34:     if (access(s, 04) == 0)
                     35:       return;
                     36:     printf("no such lesson\n");
                     37:   }
                     38:   alts = 0;
                     39: retry:
                     40:   f=scrin;
                     41:   if (f==NULL) {
                     42:     sprintf(fnam, "../L%s", level);
                     43:     f = fopen(fnam, "r");
                     44:     if (f==NULL) {
                     45:       fprintf(stderr, "No script for lesson %s.\n", level);
                     46:       wrapup(1);
                     47:     }
                     48:     while (fgets(zb, 200, f)) {
                     49:       trim(zb);
                     50:       if (strcmp(zb, "#next")==0)
                     51:         break;
                     52:     }
                     53:   }
                     54:   if (feof(f)) {
                     55:     printf("Congratulations\n\n.You have finished this sequence.\n");
                     56:     fflush(stdout);
                     57:     todo = 0;
                     58:     return;
                     59:   }
                     60:   for(i=0; fgets(s, 50, f); i++) {
                     61:     sscanf(s, "%s %d", &posslev[i], &diff[i]);
                     62:   }
                     63:   best = -1;
                     64:   /* cycle through lessons from random start */
                     65:   /* first try the current place, failing that back up to
                     66:        last place there are untried alternatives (but only one backup) */
                     67:   n = grand()%i;
                     68:   for(k=0; k<i; k++) {
                     69:     m = (n+k)%i;
                     70:     if (already(posslev[m])) continue;
                     71:     if (best<0) best=m;
                     72:     /* real alternatives */
                     73:     alts++;
                     74:     if (abs(diff[m]-speed) < abs(diff[best]-speed))
                     75:       best=m;
                     76:   }
                     77:   if (best < 0 && nsave) {
                     78:     nsave--;
                     79:     strcpy(level, saved);
                     80:     goto retry;
                     81:   }
                     82:   if (best <0) {
                     83:     /* lessons exhausted or missing */
                     84:     printf("Sorry, there are no alternative lessons at this stage.\n");
                     85:     printf("See someone for help.\n\n");
                     86:     fflush(stdout);
                     87:     todo = 0;
                     88:     return;
                     89:   }
                     90:   strcpy (dobuff, posslev[best]);
                     91:   if (alts>1) {
                     92:     nsave=1;
                     93:     strcpy (saved, level);
                     94:   }
                     95:   todo = dobuff;
                     96:   fclose(f);
                     97: }
                     98: 
                     99: abs(x)
                    100: {
                    101:   return(x>=0? x: -x);
                    102: }
                    103: 
                    104: grand()
                    105: {
                    106:   static int garbage;
                    107:   int a[2], b;
                    108: 
                    109:   time(a);
                    110:   b = a[1]+10*garbage++;
                    111:   return(b&077777);
                    112: }
                    113: #copyin
                    114: #user
                    115: #uncopyin
                    116: #match 73
                    117: #bad 43
                    118: The second______ one.
                    119: #log
                    120: #next
                    121: 44.1h 10

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