| 1 | #include <stdio.h> |
| 2 | |
| 3 | main(argc, argv) |
| 4 | char **argv; |
| 5 | { |
| 6 | register bflg, c, n; |
| 7 | int undc=8; |
| 8 | |
| 9 | bflg = 1; |
| 10 | if (argc>1 && argv[1][0]=='-') { |
| 11 | undc = atoi(&argv[1][1]); |
| 12 | if (undc>16) |
| 13 | undc = 0; |
| 14 | argc--; |
| 15 | argv++; |
| 16 | } |
| 17 | if (argc>1) { |
| 18 | if ((freopen(argv[1], "r", stdin))==NULL) { |
| 19 | fprintf(stderr, "Cannot open %s\n", argv[1]); |
| 20 | exit(1); |
| 21 | } |
| 22 | } |
| 23 | while((c = getchar()) != EOF) { |
| 24 | if(c == '\n' || c == 014) { |
| 25 | bflg = 1; |
| 26 | putchar(c); |
| 27 | continue; |
| 28 | } |
| 29 | if(bflg) { |
| 30 | for (n=0; n<undc; n++) |
| 31 | putchar('\b'); |
| 32 | bflg = 0; |
| 33 | } |
| 34 | putchar(c); |
| 35 | } |
| 36 | return(0); |
| 37 | } |