projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| d2bfe217 SL |
1 | /* fastcopy.c 1.1 86/01/12 */ |
| 2 | /* fastcopy.c */ | |
| 3 | ||
| 4 | #define BSIZE 1024 | |
| 5 | #define FACTOR 32 /* 32k bytes in one i/o */ | |
| 6 | ||
| 7 | char buffer[BSIZE * FACTOR]; | |
| 8 | ||
| 9 | main() | |
| 10 | { | |
| 11 | char in_dev[50]; | |
| 12 | char out_dev[50]; | |
| 13 | char blocks[50]; | |
| 14 | register int input; | |
| 15 | register int output; | |
| 16 | register int count; | |
| 17 | register int firstread = 1; | |
| 18 | register int blk_siz = BSIZE * FACTOR; | |
| 19 | register int blk_num = 0; | |
| 20 | register int read_count = 0; | |
| 21 | register int write_count = 0; | |
| 22 | register int transfers = 0; | |
| 23 | ||
| 24 | in_dev[0] = 0; | |
| 25 | out_dev[0] = 0; | |
| 26 | blocks[0] = 0; | |
| 27 | for(;;) { | |
| 28 | /* get input and output devices */ | |
| 29 | printf("Source device : "); | |
| 30 | gets(in_dev); | |
| 31 | if((input = open(in_dev, 0)) > 0) | |
| 32 | break; | |
| 33 | printf("Cannot open input file '%s'\n", in_dev); | |
| 34 | } | |
| 35 | ||
| 36 | for(;;) { | |
| 37 | printf("Copy to device : "); | |
| 38 | gets(out_dev); | |
| 39 | if((output = open(out_dev, 1)) > 0) | |
| 40 | break; | |
| 41 | printf("Cannot open output file '%s'\n", out_dev); | |
| 42 | } | |
| 43 | ||
| 44 | for(;;) { | |
| 45 | printf("Number of blocks : "); | |
| 46 | gets(blocks); | |
| 47 | count = number(blocks); | |
| 48 | if(count > 0) | |
| 49 | break; | |
| 50 | } | |
| 51 | printf("\nCopy %d blocks from %s to %s\n", count, in_dev, out_dev); | |
| 52 | do { | |
| 53 | if ((transfers > 0) && !(transfers % 25)) | |
| 54 | printf("%d blocks\n", blk_num); | |
| 55 | transfers++; | |
| 56 | read_count = read(input, buffer, | |
| 57 | ((count*BSIZE) > blk_siz) ? blk_siz : count*BSIZE); | |
| 58 | if (firstread) { | |
| 59 | if (read_count != blk_siz) { | |
| 60 | blk_siz = read_count; | |
| 61 | } | |
| 62 | firstread = 0; | |
| 63 | printf("Block size from input = %d bytes\n", blk_siz); | |
| 64 | } | |
| 65 | if (read_count > 0) { | |
| 66 | if (read_count != blk_siz) | |
| 67 | printf("Short read! Block %d: %d read, %d bytes requested\n", blk_num, read_count, blk_siz); | |
| 68 | write_count = write(output, buffer, read_count); | |
| 69 | if (write_count != read_count) | |
| 70 | printf("Short write! Block %d: %d bytes written of %d bytes possible\n", blk_num, write_count, read_count); | |
| 71 | count -= read_count / BSIZE; | |
| 72 | blk_num += read_count / BSIZE; | |
| 73 | } | |
| 74 | } while((read_count > 0) && (write_count > 0) && (count > 0)); | |
| 75 | printf ("Total of %d blocks copied\n", blk_num); | |
| 76 | close(input); | |
| 77 | close(output); | |
| 78 | } | |
| 79 | ||
| 80 | int number (response) | |
| 81 | char *response; | |
| 82 | { | |
| 83 | int total; | |
| 84 | ||
| 85 | total = 0; | |
| 86 | while (*response == ' ' || *response == '\t') response++; | |
| 87 | while (*response >= '0' && *response <= '9') { | |
| 88 | total = total * 10 + (*response - '0'); | |
| 89 | response++; | |
| 90 | } | |
| 91 | return (total); | |
| 92 | } |