| 1 | /* |
| 2 | * Concatenate files. |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <sys/types.h> |
| 7 | #include <sys/stat.h> |
| 8 | |
| 9 | char stdbuf[BUFSIZ]; |
| 10 | |
| 11 | main(argc, argv) |
| 12 | char **argv; |
| 13 | { |
| 14 | int fflg = 0; |
| 15 | register FILE *fi; |
| 16 | register c; |
| 17 | int dev, ino = -1; |
| 18 | struct stat statb; |
| 19 | |
| 20 | setbuf(stdout, stdbuf); |
| 21 | for( ; argc>1 && argv[1][0]=='-'; argc--,argv++) { |
| 22 | switch(argv[1][1]) { |
| 23 | case 0: |
| 24 | break; |
| 25 | case 'u': |
| 26 | setbuf(stdout, (char *)NULL); |
| 27 | continue; |
| 28 | } |
| 29 | break; |
| 30 | } |
| 31 | fstat(fileno(stdout), &statb); |
| 32 | statb.st_mode &= S_IFMT; |
| 33 | if (statb.st_mode!=S_IFCHR && statb.st_mode!=S_IFBLK) { |
| 34 | dev = statb.st_dev; |
| 35 | ino = statb.st_ino; |
| 36 | } |
| 37 | if (argc < 2) { |
| 38 | argc = 2; |
| 39 | fflg++; |
| 40 | } |
| 41 | while (--argc > 0) { |
| 42 | if (fflg || (*++argv)[0]=='-' && (*argv)[1]=='\0') |
| 43 | fi = stdin; |
| 44 | else { |
| 45 | if ((fi = fopen(*argv, "r")) == NULL) { |
| 46 | fprintf(stderr, "cat: can't open %s\n", *argv); |
| 47 | continue; |
| 48 | } |
| 49 | } |
| 50 | fstat(fileno(fi), &statb); |
| 51 | if (statb.st_dev==dev && statb.st_ino==ino) { |
| 52 | fprintf(stderr, "cat: input %s is output\n", |
| 53 | fflg?"-": *argv); |
| 54 | fclose(fi); |
| 55 | continue; |
| 56 | } |
| 57 | while ((c = getc(fi)) != EOF) |
| 58 | putchar(c); |
| 59 | if (fi!=stdin) |
| 60 | fclose(fi); |
| 61 | } |
| 62 | return(0); |
| 63 | } |