projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 481f6ae2 WJ |
1 | /* |
| 2 | * Copyright (c) 1980, 1987 Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. Neither the name of the University nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
| 32 | */ | |
| 33 | ||
| 34 | #ifndef lint | |
| 35 | char copyright[] = | |
| 36 | "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\ | |
| 37 | All rights reserved.\n"; | |
| 38 | #endif /* not lint */ | |
| 39 | ||
| 40 | #ifndef lint | |
| 41 | static char sccsid[] = "@(#)head.c 5.5 (Berkeley) 6/1/90"; | |
| 42 | #endif /* not lint */ | |
| 43 | ||
| 44 | #include <stdio.h> | |
| 45 | #include <ctype.h> | |
| 46 | /* | |
| 47 | * head - give the first few lines of a stream or of each of a set of files | |
| 48 | * | |
| 49 | * Bill Joy UCB August 24, 1977 | |
| 50 | */ | |
| 51 | ||
| 52 | main(argc, argv) | |
| 53 | int argc; | |
| 54 | char **argv; | |
| 55 | { | |
| 56 | register int ch, cnt; | |
| 57 | int firsttime, linecnt = 10; | |
| 58 | ||
| 59 | if (argc > 1 && argv[1][0] == '-') { | |
| 60 | if (!isdigit(argv[1][1])) { | |
| 61 | fprintf(stderr, "head: illegal option -- %c\n", argv[1][1]); | |
| 62 | goto usage; | |
| 63 | } | |
| 64 | if ((linecnt = atoi(argv[1] + 1)) < 0) { | |
| 65 | usage: fputs("usage: head [-line_count] [file ...]\n", stderr); | |
| 66 | exit(1); | |
| 67 | } | |
| 68 | --argc; ++argv; | |
| 69 | } | |
| 70 | /* setlinebuf(stdout); */ | |
| 71 | for (firsttime = 1, --argc, ++argv;; firsttime = 0) { | |
| 72 | if (!*argv) { | |
| 73 | if (!firsttime) | |
| 74 | exit(0); | |
| 75 | } | |
| 76 | else { | |
| 77 | if (!freopen(*argv, "r", stdin)) { | |
| 78 | fprintf(stderr, "head: can't read %s.\n", *argv); | |
| 79 | exit(1); | |
| 80 | } | |
| 81 | if (argc > 1) { | |
| 82 | if (!firsttime) | |
| 83 | putchar('\n'); | |
| 84 | printf("==> %s <==\n", *argv); | |
| 85 | } | |
| 86 | ++argv; | |
| 87 | } | |
| 88 | for (cnt = linecnt; cnt; --cnt) | |
| 89 | while ((ch = getchar()) != EOF) | |
| 90 | if (putchar(ch) == '\n') | |
| 91 | break; | |
| 92 | } | |
| 93 | /*NOTREACHED*/ | |
| 94 | } |