diff options
Diffstat (limited to 'usr/src/cmd/head')
| -rw-r--r-- | usr/src/cmd/head/Makefile | 45 | ||||
| -rw-r--r-- | usr/src/cmd/head/head.c | 180 |
2 files changed, 225 insertions, 0 deletions
diff --git a/usr/src/cmd/head/Makefile b/usr/src/cmd/head/Makefile new file mode 100644 index 0000000000..fe38498154 --- /dev/null +++ b/usr/src/cmd/head/Makefile @@ -0,0 +1,45 @@ +# +# CDDL HEADER START +# +# The contents of this file are subject to the terms of the +# Common Development and Distribution License, Version 1.0 only +# (the "License"). You may not use this file except in compliance +# with the License. +# +# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE +# or http://www.opensolaris.org/os/licensing. +# See the License for the specific language governing permissions +# and limitations under the License. +# +# When distributing Covered Code, include this CDDL HEADER in each +# file and include the License file at usr/src/OPENSOLARIS.LICENSE. +# If applicable, add the following below this CDDL HEADER, with the +# fields enclosed by brackets "[]" replaced with your own identifying +# information: Portions Copyright [yyyy] [name of copyright owner] +# +# CDDL HEADER END +# +# +#ident "%Z%%M% %I% %E% SMI" +# +# Copyright 2004 Sun Microsystems, Inc. All rights reserved. +# Use is subject to license terms. +# + +PROG= head + +include ../Makefile.cmd +CFLAGS += $(CCVERBOSE) +CPPFLAGS += -D_FILE_OFFSET_BITS=64 + +.KEEP_STATE: + +all: $(PROG) + +install: all $(ROOTPROG) + +clean: + +lint: lint_PROG + +include ../Makefile.targ diff --git a/usr/src/cmd/head/head.c b/usr/src/cmd/head/head.c new file mode 100644 index 0000000000..a9f051f495 --- /dev/null +++ b/usr/src/cmd/head/head.c @@ -0,0 +1,180 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2004 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ +/* All Rights Reserved */ + +/* + * University Copyright- Copyright (c) 1982, 1986, 1988 + * The Regents of the University of California + * All Rights Reserved + * + * University Acknowledgment- Portions of this document are derived from + * software developed by the University of California, Berkeley, and its + * contributors. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <locale.h> +#include <string.h> +#include <ctype.h> + +#define DEF_LINE_COUNT 10 + +static void copyout(off_t); +static void Usage(); + + +/* + * head - give the first few lines of a stream or of each of a set of files + * + */ +int +main(int argc, char **argv) +{ + int fileCount; + int around = 0; + int i; + int opt; + off_t linecnt = DEF_LINE_COUNT; + int error = 0; + + (void) setlocale(LC_ALL, ""); +#if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */ +#define TEXT_DOMAIN "SYS_TEST" /* Use this only if it weren't */ +#endif + (void) textdomain(TEXT_DOMAIN); + + /* check for non-standard "-line-count" option */ + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "--") == 0) + break; + + if ((argv[i][0] == '-') && isdigit(argv[i][1])) { + if (strlen(&argv[i][1]) != + strspn(&argv[i][1], "0123456789")) { + (void) fprintf(stderr, gettext( + "%s: Badly formed number\n"), argv[0]); + Usage(); + } + + linecnt = (off_t) strtoll(&argv[i][1], (char **)NULL, + 10); + while (i < argc) { + argv[i] = argv[i + 1]; + i++; + } + argc--; + } + } + + /* get options */ + while ((opt = getopt(argc, argv, "n:")) != EOF) { + switch (opt) { + case 'n': + if ((strcmp(optarg, "--") == 0) || (optind > argc)) { + (void) fprintf(stderr, gettext( + "%s: Missing -n argument\n"), argv[0]), + Usage(); + } + linecnt = (off_t) strtoll(optarg, (char **)NULL, 10); + if (linecnt <= 0) { + (void) fprintf(stderr, gettext( + "%s: Invalid \"-n %s\" option\n"), + argv[0], optarg); + Usage(); + } + break; + + default: + Usage(); + } + } + + fileCount = argc - optind; + + do { + if ((argv[optind] == NULL) && around) + break; + + if (argv[optind] != NULL) { + (void) close(0); + if (freopen(argv[optind], "r", stdin) == NULL) { + perror(argv[optind]); + error = 1; + optind++; + continue; + } + } + + if (around) + (void) putchar('\n'); + + if (fileCount > 1) + (void) printf("==> %s <==\n", argv[optind]); + + if (argv[optind] != NULL) + optind++; + + copyout(linecnt); + (void) fflush(stdout); + around++; + + } while (argv[optind] != NULL); + + return (error); +} + +static void +copyout(cnt) + register off_t cnt; +{ + char lbuf[BUFSIZ]; + size_t len; + + while (cnt > 0 && fgets(lbuf, sizeof (lbuf), stdin) != 0) { + (void) printf("%s", lbuf); + /* only count as a line if buffer read ends with newline */ + if ((len = strlen(lbuf)) > 0) { + if (lbuf[len - 1] == '\n') { + (void) fflush(stdout); + cnt--; + } + } + } +} + +static void +Usage() +{ + (void) printf(gettext("usage: head [-n #] [-#] [filename...]\n")); + exit(1); +} |