19b50d902SRodney W. Grimes /* 29b50d902SRodney W. Grimes * Copyright (c) 1980, 1987, 1992, 1993 39b50d902SRodney W. Grimes * The Regents of the University of California. All rights reserved. 49b50d902SRodney W. Grimes * 59b50d902SRodney W. Grimes * Redistribution and use in source and binary forms, with or without 69b50d902SRodney W. Grimes * modification, are permitted provided that the following conditions 79b50d902SRodney W. Grimes * are met: 89b50d902SRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 99b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer. 109b50d902SRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 119b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 129b50d902SRodney W. Grimes * documentation and/or other materials provided with the distribution. 139b50d902SRodney W. Grimes * 3. All advertising materials mentioning features or use of this software 149b50d902SRodney W. Grimes * must display the following acknowledgement: 159b50d902SRodney W. Grimes * This product includes software developed by the University of 169b50d902SRodney W. Grimes * California, Berkeley and its contributors. 179b50d902SRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 189b50d902SRodney W. Grimes * may be used to endorse or promote products derived from this software 199b50d902SRodney W. Grimes * without specific prior written permission. 209b50d902SRodney W. Grimes * 219b50d902SRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 229b50d902SRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 239b50d902SRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 249b50d902SRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 259b50d902SRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 269b50d902SRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 279b50d902SRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 289b50d902SRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 299b50d902SRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 309b50d902SRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 319b50d902SRodney W. Grimes * SUCH DAMAGE. 329b50d902SRodney W. Grimes */ 339b50d902SRodney W. Grimes 349b50d902SRodney W. Grimes #ifndef lint 359b50d902SRodney W. Grimes static char copyright[] = 369b50d902SRodney W. Grimes "@(#) Copyright (c) 1980, 1987, 1992, 1993\n\ 379b50d902SRodney W. Grimes The Regents of the University of California. All rights reserved.\n"; 389b50d902SRodney W. Grimes #endif /* not lint */ 399b50d902SRodney W. Grimes 409b50d902SRodney W. Grimes #ifndef lint 419b50d902SRodney W. Grimes static char sccsid[] = "@(#)head.c 8.1 (Berkeley) 6/6/93"; 429b50d902SRodney W. Grimes #endif /* not lint */ 439b50d902SRodney W. Grimes 449b50d902SRodney W. Grimes #include <sys/types.h> 459b50d902SRodney W. Grimes #include <errno.h> 469b50d902SRodney W. Grimes #include <stdlib.h> 479b50d902SRodney W. Grimes #include <string.h> 489b50d902SRodney W. Grimes #include <stdio.h> 499b50d902SRodney W. Grimes #include <ctype.h> 509b50d902SRodney W. Grimes 519b50d902SRodney W. Grimes /* 529b50d902SRodney W. Grimes * head - give the first few lines of a stream or of each of a set of files 539b50d902SRodney W. Grimes * 549b50d902SRodney W. Grimes * Bill Joy UCB August 24, 1977 559b50d902SRodney W. Grimes */ 569b50d902SRodney W. Grimes 579b50d902SRodney W. Grimes void err __P((int, const char *, ...)); 589b50d902SRodney W. Grimes void head __P((FILE *, int)); 599b50d902SRodney W. Grimes void obsolete __P((char *[])); 609b50d902SRodney W. Grimes void usage __P((void)); 619b50d902SRodney W. Grimes 629b50d902SRodney W. Grimes int eval; 639b50d902SRodney W. Grimes 649b50d902SRodney W. Grimes int 659b50d902SRodney W. Grimes main(argc, argv) 669b50d902SRodney W. Grimes int argc; 679b50d902SRodney W. Grimes char *argv[]; 689b50d902SRodney W. Grimes { 699b50d902SRodney W. Grimes register int ch; 709b50d902SRodney W. Grimes FILE *fp; 719b50d902SRodney W. Grimes int first, linecnt; 729b50d902SRodney W. Grimes char *ep; 739b50d902SRodney W. Grimes 749b50d902SRodney W. Grimes obsolete(argv); 759b50d902SRodney W. Grimes linecnt = 10; 769b50d902SRodney W. Grimes while ((ch = getopt(argc, argv, "n:")) != EOF) 779b50d902SRodney W. Grimes switch(ch) { 789b50d902SRodney W. Grimes case 'n': 799b50d902SRodney W. Grimes linecnt = strtol(optarg, &ep, 10); 809b50d902SRodney W. Grimes if (*ep || linecnt <= 0) 819b50d902SRodney W. Grimes err(1, "illegal line count -- %s", optarg); 829b50d902SRodney W. Grimes break; 839b50d902SRodney W. Grimes case '?': 849b50d902SRodney W. Grimes default: 859b50d902SRodney W. Grimes usage(); 869b50d902SRodney W. Grimes } 879b50d902SRodney W. Grimes argc -= optind; 889b50d902SRodney W. Grimes argv += optind; 899b50d902SRodney W. Grimes 909b50d902SRodney W. Grimes if (*argv) 919b50d902SRodney W. Grimes for (first = 1; *argv; ++argv) { 929b50d902SRodney W. Grimes if ((fp = fopen(*argv, "r")) == NULL) { 939b50d902SRodney W. Grimes err(0, "%s: %s", *argv, strerror(errno)); 949b50d902SRodney W. Grimes continue; 959b50d902SRodney W. Grimes } 969b50d902SRodney W. Grimes if (argc > 1) { 979b50d902SRodney W. Grimes (void)printf("%s==> %s <==\n", 989b50d902SRodney W. Grimes first ? "" : "\n", *argv); 999b50d902SRodney W. Grimes first = 0; 1009b50d902SRodney W. Grimes } 1019b50d902SRodney W. Grimes head(fp, linecnt); 1029b50d902SRodney W. Grimes (void)fclose(fp); 1039b50d902SRodney W. Grimes } 1049b50d902SRodney W. Grimes else 1059b50d902SRodney W. Grimes head(stdin, linecnt); 1069b50d902SRodney W. Grimes exit(eval); 1079b50d902SRodney W. Grimes } 1089b50d902SRodney W. Grimes 1099b50d902SRodney W. Grimes void 1109b50d902SRodney W. Grimes head(fp, cnt) 1119b50d902SRodney W. Grimes FILE *fp; 1129b50d902SRodney W. Grimes register int cnt; 1139b50d902SRodney W. Grimes { 1149b50d902SRodney W. Grimes register int ch; 1159b50d902SRodney W. Grimes 1169b50d902SRodney W. Grimes while (cnt--) 1179b50d902SRodney W. Grimes while ((ch = getc(fp)) != EOF) { 1189b50d902SRodney W. Grimes if (putchar(ch) == EOF) 1199b50d902SRodney W. Grimes err(1, "stdout: %s", strerror(errno)); 1209b50d902SRodney W. Grimes if (ch == '\n') 1219b50d902SRodney W. Grimes break; 1229b50d902SRodney W. Grimes } 1239b50d902SRodney W. Grimes } 1249b50d902SRodney W. Grimes 1259b50d902SRodney W. Grimes void 1269b50d902SRodney W. Grimes obsolete(argv) 1279b50d902SRodney W. Grimes char *argv[]; 1289b50d902SRodney W. Grimes { 1299b50d902SRodney W. Grimes char *ap; 1309b50d902SRodney W. Grimes 1319b50d902SRodney W. Grimes while (ap = *++argv) { 1329b50d902SRodney W. Grimes /* Return if "--" or not "-[0-9]*". */ 1339b50d902SRodney W. Grimes if (ap[0] != '-' || ap[1] == '-' || !isdigit(ap[1])) 1349b50d902SRodney W. Grimes return; 1359b50d902SRodney W. Grimes if ((ap = malloc(strlen(*argv) + 2)) == NULL) 1369b50d902SRodney W. Grimes err(1, "%s", strerror(errno)); 1379b50d902SRodney W. Grimes ap[0] = '-'; 1389b50d902SRodney W. Grimes ap[1] = 'n'; 1399b50d902SRodney W. Grimes (void)strcpy(ap + 2, *argv + 1); 1409b50d902SRodney W. Grimes *argv = ap; 1419b50d902SRodney W. Grimes } 1429b50d902SRodney W. Grimes } 1439b50d902SRodney W. Grimes 1449b50d902SRodney W. Grimes void 1459b50d902SRodney W. Grimes usage() 1469b50d902SRodney W. Grimes { 1479b50d902SRodney W. Grimes (void)fprintf(stderr, "usage: head [-n lines] [file ...]\n"); 1489b50d902SRodney W. Grimes exit(1); 1499b50d902SRodney W. Grimes } 1509b50d902SRodney W. Grimes 1519b50d902SRodney W. Grimes #if __STDC__ 1529b50d902SRodney W. Grimes #include <stdarg.h> 1539b50d902SRodney W. Grimes #else 1549b50d902SRodney W. Grimes #include <varargs.h> 1559b50d902SRodney W. Grimes #endif 1569b50d902SRodney W. Grimes 1579b50d902SRodney W. Grimes void 1589b50d902SRodney W. Grimes #if __STDC__ 1599b50d902SRodney W. Grimes err(int fatal, const char *fmt, ...) 1609b50d902SRodney W. Grimes #else 1619b50d902SRodney W. Grimes err(fatal, fmt, va_alist) 1629b50d902SRodney W. Grimes int fatal; 1639b50d902SRodney W. Grimes char *fmt; 1649b50d902SRodney W. Grimes va_dcl 1659b50d902SRodney W. Grimes #endif 1669b50d902SRodney W. Grimes { 1679b50d902SRodney W. Grimes va_list ap; 1689b50d902SRodney W. Grimes #if __STDC__ 1699b50d902SRodney W. Grimes va_start(ap, fmt); 1709b50d902SRodney W. Grimes #else 1719b50d902SRodney W. Grimes va_start(ap); 1729b50d902SRodney W. Grimes #endif 1739b50d902SRodney W. Grimes (void)fprintf(stderr, "head: "); 1749b50d902SRodney W. Grimes (void)vfprintf(stderr, fmt, ap); 1759b50d902SRodney W. Grimes va_end(ap); 1769b50d902SRodney W. Grimes (void)fprintf(stderr, "\n"); 1779b50d902SRodney W. Grimes if (fatal) 1789b50d902SRodney W. Grimes exit(1); 1799b50d902SRodney W. Grimes eval = 1; 1809b50d902SRodney W. Grimes } 181