mg.c

#include "defs.h"

# define  NPT    2000
int npt,perm[NPT+1],had[NPT+1];
FILE *fopen(),*op;

int 
main (int argc, char *argv[])
{ int arg,nb,nperms,i,j,k,l,n;  char cyc,outf[80],err; int c;
/* Default outf=gpname.inperm  */
  err=0; arg=1; if (argc<=arg) {err=1; goto error;}
  strcpy(outf,argv[arg]); strcat(outf,".");
  arg++; if (argc<=arg) strcat(outf,"inperm"); else strcat(outf,argv[arg]);
  op=fopen(outf,"w");
  printf("Input npt, nperms, init. nb.\n");
  scanf("%d%d%d",&npt,&nperms,&nb);
  if (npt>NPT)
  { fprintf(stderr,"npt too big. Increase NPT.\n"); exit(1);}
  fprintf(op,"%4d%4d%4d%4d\n",npt,nperms,nb,0);
  if (nb!=0)
  { printf("Input initial base points.\n");
    for (i=1;i<=npt;i++) had[i]=0;
    for (i=1;i<=nb;i++)
    { scanf("%d",&n);
      if (n<=0 || n>npt || had[n])
      { fprintf(stderr,"Invalid or repeated base point %d\n",n); exit(1);}
      perm[i]=n; had[n]=1;
    }
    if (npt>=1000)
    { for (i=1;i<=nb;i++) fprintf(op,"%5d",perm[i]); fprintf(op,"\n");}
    else
    { for (i=1;i<=nb;i++) fprintf(op,"%4d",perm[i]); fprintf(op,"\n");}
  }
  printf("Now input perms in cyclic not'n. End each perm with a '.'.\n");
  for (i=1;i<=nperms;i++)
  { for (j=1;j<=npt;j++) { perm[j]=j; had[j]=0;}
    while ((c=getchar()) != '.') if (c=='(')
    { cyc=1; j=0;
      while (cyc)
      { scanf("%d",&l);
        if (l<=0 || l>npt || had[l])
        { fprintf(stderr,"Invalid or repeated point %d\n",l); exit(1);}
        had[l]=1;
        if (j==0) {j=l;k=l;} else {perm[k]=l;k=l;}
        while ((c=getchar())==' '); if (c==')') {cyc=0; perm[k]=j;}
      }
    }
    if (npt>=1000)
    { for (j=1;j<=npt;j++) fprintf(op,"%5d",perm[j]);fprintf(op,"\n");}
    else
    { for (j=1;j<=npt;j++) fprintf(op,"%4d",perm[j]);fprintf(op,"\n");}
  }
  error:  if (err)
  { fprintf(stderr,"Usage    makegp gpname [outf].\n"); exit(1);}
  exit(0);
}