/* * Copyright (c) 1980, 1987, 1992, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Modified for GNO (Apple IIGS) by Dave Tribby, July 1997 * * Constructs unacceptable to compiler are replaced using #ifndef __ORCAC__ * * Changes not related to compiler are replaced using #ifndef __GNO__ * * Added prototyped headers, surrounded by #ifndef __STDC__ */ #ifndef __GNO__ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1980, 1987, 1992, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)head.c 8.2 (Berkeley) 5/4/95"; #endif static const char rcsid[] = "$Id: head.c,v 1.2 1997/09/26 06:20:06 gdr Exp $"; #endif /* not lint */ #endif #include #include #include #include #include #include #include /* * head - give the first few lines of a stream or of each of a set of files * * Bill Joy UCB August 24, 1977 */ void head __P((FILE *, int)); void head_bytes __P((FILE *, int)); void obsolete __P((char *[])); void usage __P((void)); int eval; /* Interface to check on how much stack space a C program uses. */ #if defined(__GNO__) && defined(__STACK_CHECK__) #ifndef _STDLIB_H_ #include #endif #include static void report_stack(void) { fprintf(stderr,"\n ==> %d stack bytes used <== \n", _endStackCheck()); } #endif int #ifndef __STDC__ main(argc, argv) int argc; char *argv[]; #else main(int argc, char *argv[]) #endif { register int ch; FILE *fp; int first, linecnt = -1, bytecnt = -1; char *ep; #if defined(__GNO__) && defined(__STACK_CHECK__) _beginStackCheck(); atexit(report_stack); #endif obsolete(argv); while ((ch = getopt(argc, argv, "n:c:")) != -1) switch(ch) { case 'c': bytecnt = strtol(optarg, &ep, 10); if (*ep || bytecnt <= 0) errx(1, "illegal byte count -- %s", optarg); break; case 'n': linecnt = strtol(optarg, &ep, 10); if (*ep || linecnt <= 0) errx(1, "illegal line count -- %s", optarg); break; case '?': default: usage(); } argc -= optind; #ifndef __ORCAC__ argv += optind; #else /* ORCA/C 2.1 compiler cannot handle += on pointer */ argv = argv + optind; #endif if (linecnt != -1 && bytecnt != -1) errx(1, "can't combine line and byte counts"); if (linecnt == -1 ) linecnt = 10; if (*argv) { for (first = 1; *argv; ++argv) { if ((fp = fopen(*argv, "r")) == NULL) { warn("%s", *argv); eval = 1; continue; } if (argc > 1) { (void)printf("%s==> %s <==\n", first ? "" : "\n", *argv); first = 0; } if (bytecnt == -1) head(fp, linecnt); else head_bytes(fp, bytecnt); (void)fclose(fp); } } else if (bytecnt == -1) head(stdin, linecnt); else head_bytes(stdin, bytecnt); exit(eval); } void #ifndef __STDC__ head(fp, cnt) FILE *fp; register int cnt; #else head(FILE *fp, register int cnt) #endif { register int ch; while (cnt && (ch = getc(fp)) != EOF) { if (putchar(ch) == EOF) err(1, "stdout"); if (ch == '\n') cnt--; } } void #ifndef __STDC__ head_bytes(fp, cnt) FILE *fp; register int cnt; #else head_bytes(FILE *fp, register int cnt) #endif { #ifndef __GNO__ char buf[4096]; #else /* Cannot handle 4096 bytes on stack. Since head_bytes is */ /* non-recursive, make it a static array. DMT */ static char buf[4096]; #endif register int readlen; while (cnt) { if (cnt < sizeof(buf)) readlen = cnt; else readlen = sizeof(buf); readlen = fread(buf, sizeof(char), readlen, fp); if (readlen == EOF) break; if (fwrite(buf, sizeof(char), readlen, stdout) != readlen) err(1, "stdout"); cnt -= readlen; } } void #ifndef __STDC__ obsolete(argv) char *argv[]; #else obsolete(char *argv[]) #endif { char *ap; while ((ap = *++argv)) { /* Return if "--" or not "-[0-9]*". */ if (ap[0] != '-' || ap[1] == '-' || !isdigit(ap[1])) return; if ((ap = malloc(strlen(*argv) + 2)) == NULL) err(1, NULL); ap[0] = '-'; ap[1] = 'n'; (void)strcpy(ap + 2, *argv + 1); *argv = ap; } } void #ifndef __STDC__ usage() #else usage(void) #endif { #ifndef __GNO__ (void)fprintf(stderr, "usage: head [-n lines] [-c bytes] [file ...]\n"); #else /* Show -n and -c as exclusive, and add obsolescent format (DMT) */ (void)fprintf(stderr, "usage: head [-n lines | -c bytes] [file ...]\n"); (void)fprintf(stderr, " head [-count] [file ...]\n"); #endif exit(1); }