projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| efa30d97 BJ |
1 | static char *sccsid = "@(#)cat.c 4.1 (Berkeley) %G%"; |
| 2 | /* | |
| 3 | * Concatenate files. | |
| 4 | */ | |
| 5 | ||
| 6 | #include <stdio.h> | |
| 7 | #include <sys/types.h> | |
| 8 | #include <sys/stat.h> | |
| 9 | ||
| 10 | char stdbuf[BUFSIZ]; | |
| 11 | ||
| 12 | main(argc, argv) | |
| 13 | char **argv; | |
| 14 | { | |
| 15 | int fflg = 0; | |
| 16 | register FILE *fi; | |
| 17 | register c; | |
| 18 | int dev, ino = -1; | |
| 19 | struct stat statb; | |
| 20 | ||
| 21 | setbuf(stdout, stdbuf); | |
| 22 | for( ; argc>1 && argv[1][0]=='-'; argc--,argv++) { | |
| 23 | switch(argv[1][1]) { | |
| 24 | case 0: | |
| 25 | break; | |
| 26 | case 'u': | |
| 27 | setbuf(stdout, (char *)NULL); | |
| 28 | continue; | |
| 29 | } | |
| 30 | break; | |
| 31 | } | |
| 32 | fstat(fileno(stdout), &statb); | |
| 33 | statb.st_mode &= S_IFMT; | |
| 34 | if (statb.st_mode!=S_IFCHR && statb.st_mode!=S_IFBLK) { | |
| 35 | dev = statb.st_dev; | |
| 36 | ino = statb.st_ino; | |
| 37 | } | |
| 38 | if (argc < 2) { | |
| 39 | argc = 2; | |
| 40 | fflg++; | |
| 41 | } | |
| 42 | while (--argc > 0) { | |
| 43 | if (fflg || (*++argv)[0]=='-' && (*argv)[1]=='\0') | |
| 44 | fi = stdin; | |
| 45 | else { | |
| 46 | if ((fi = fopen(*argv, "r")) == NULL) { | |
| 47 | fprintf(stderr, "cat: can't open %s\n", *argv); | |
| 48 | continue; | |
| 49 | } | |
| 50 | } | |
| 51 | fstat(fileno(fi), &statb); | |
| 52 | if (statb.st_dev==dev && statb.st_ino==ino) { | |
| 53 | fprintf(stderr, "cat: input %s is output\n", | |
| 54 | fflg?"-": *argv); | |
| 55 | fclose(fi); | |
| 56 | continue; | |
| 57 | } | |
| 58 | while ((c = getc(fi)) != EOF) | |
| 59 | putchar(c); | |
| 60 | if (fi!=stdin) | |
| 61 | fclose(fi); | |
| 62 | } | |
| 63 | return(0); | |
| 64 | } |