93 lines
1.6 KiB
C
93 lines
1.6 KiB
C
/*
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* Copyright (c) 1980 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1980 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 1.1 92/07/30 SMI"; /* from UCB 5.1 5/31/85 */
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#endif not lint
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#include <stdio.h>
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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 linecnt = 10;
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int argc;
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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 argc;
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char *name;
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register char *argp;
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static int around;
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Argc--, argv++;
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argc = Argc;
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do {
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while (argc > 0 && argv[0][0] == '-') {
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linecnt = getnum(argv[0] + 1);
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argc--, argv++, Argc--;
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}
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if (argc == 0 && around)
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break;
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if (argc > 0) {
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close(0);
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if (freopen(argv[0], "r", stdin) == NULL) {
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perror(argv[0]);
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exit(1);
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}
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name = argv[0];
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argc--, argv++;
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} else
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name = 0;
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if (around)
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putchar('\n');
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around++;
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if (Argc > 1 && name)
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printf("==> %s <==\n", name);
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copyout(linecnt);
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fflush(stdout);
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} while (argc > 0);
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exit(0);
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/* NOTREACHED */
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}
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copyout(cnt)
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register int cnt;
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{
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register int c;
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char lbuf[BUFSIZ];
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while (cnt > 0 && fgets(lbuf, sizeof lbuf, stdin) != 0) {
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printf("%s", lbuf);
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fflush(stdout);
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cnt--;
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}
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}
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getnum(cp)
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register char *cp;
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{
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register int i;
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for (i = 0; *cp >= '0' && *cp <= '9'; cp++)
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i *= 10, i += *cp - '0';
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if (*cp) {
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fprintf(stderr, "Badly formed number\n");
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exit(1);
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}
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return (i);
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}
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