Commit | Line | Data |
---|---|---|
9c79dca0 BJ |
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 | } |