151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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* Copyright (c) 1980, 1987 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Internationalized by frank@ceres.esd.sgi.com
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)head.c 5.5 (Berkeley) 6/1/90";
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#endif /* not lint */
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#include <stdio.h>
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#include <ctype.h>
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#include <locale.h>
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#include <fmtmsg.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <sgi_nl.h>
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#include <msgs/uxsgicore.h>
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/* locals */
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char cmd_label[] = "UX:head";
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/*
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* head - give the first few lines of a stream or of each of a set of files
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*
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* Bill Joy UCB August 24, 1977
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*/
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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register int ch, cnt;
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int firsttime, linecnt = 10;
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int exit_val;
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extern char *optarg;
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extern int optind,opterr,optopt;
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int gotnum = 0;
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int c;
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/*
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* intnl support
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*/
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(void)setlocale(LC_ALL, "");
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(void)setcat("uxsgicore");
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(void)setlabel(cmd_label);
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opterr = 0;
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while ((c = getopt(argc, argv, "n:")) != EOF)
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{
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switch (c) {
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case 'n':
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if(isdigit(*optarg) && !gotnum)
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{
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if((linecnt = atoi(optarg)) < 0)
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goto usage;
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else
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{ ++gotnum;
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break;
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}
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}
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else goto usage;
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break;
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case '?':
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if(!isdigit(optopt))
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{
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_sgi_nl_error(SGINL_NOSYSERR, cmd_label,
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gettxt(_SGI_DMMX_illoption, "illegal option -- %c"),
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optopt);
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goto usage;
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}
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if(gotnum)
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goto usage;
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if(optind == 2)
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{
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if((linecnt = atoi(&argv[optind-1][1])) < 0)
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goto usage;
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else
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{ ++gotnum;
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break;
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}
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}
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break;
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}
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}
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if(optind > 1)
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{
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--optind;
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argc -= optind;
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argv += optind;
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}
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exit_val = 0;
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for(firsttime = 1, --argc, ++argv;; firsttime = 0) {
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if( !*argv) {
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if(!firsttime)
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exit(exit_val);
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} else {
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if( !freopen(*argv, "r", stdin)) {
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_sgi_nl_error(SGINL_NOSYSERR, cmd_label,
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gettxt(_SGI_DMMX_CannotRead,
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"Cannot read from %s"),
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*argv);
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exit_val = 1;
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++argv;
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continue;
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}
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if(argc > 1) {
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if( !firsttime)
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putchar('\n');
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printf("==> %s <==\n", *argv);
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}
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++argv;
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}
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for(cnt = linecnt; cnt; --cnt) {
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while((ch = getchar()) != EOF)
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if (putchar(ch) == '\n')
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break;
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if(ch == EOF)
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break;
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}
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}
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/*NOTREACHED*/
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usage:
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_sgi_nl_usage(SGINL_USAGE, cmd_label,
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gettxt(_SGI_DMMX_usage_head,
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"head [-number|-n number] [file ...]"));
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exit(1);
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}
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