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1.1 ! deraadt 1: /*-
! 2: * Copyright (c) 1991, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * This code is derived from software contributed to Berkeley by
! 6: * Edward Sze-Tyan Wang.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by the University of
! 19: * California, Berkeley and its contributors.
! 20: * 4. Neither the name of the University nor the names of its contributors
! 21: * may be used to endorse or promote products derived from this software
! 22: * without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 34: * SUCH DAMAGE.
! 35: */
! 36:
! 37: #ifndef lint
! 38: static char copyright[] =
! 39: "@(#) Copyright (c) 1991, 1993\n\
! 40: The Regents of the University of California. All rights reserved.\n";
! 41: #endif /* not lint */
! 42:
! 43: #ifndef lint
! 44: #if 0
! 45: static char sccsid[] = "@(#)tail.c 8.1 (Berkeley) 6/6/93";
! 46: #endif
! 47: static char rcsid[] = "$NetBSD: tail.c,v 1.4 1994/11/23 07:42:16 jtc Exp $";
! 48: #endif /* not lint */
! 49:
! 50: #include <sys/types.h>
! 51: #include <sys/stat.h>
! 52: #include <errno.h>
! 53: #include <unistd.h>
! 54: #include <stdio.h>
! 55: #include <stdlib.h>
! 56: #include <string.h>
! 57: #include "extern.h"
! 58:
! 59: int fflag, rflag, rval;
! 60: char *fname;
! 61:
! 62: static void obsolete __P((char **));
! 63: static void usage __P((void));
! 64:
! 65: int
! 66: main(argc, argv)
! 67: int argc;
! 68: char *argv[];
! 69: {
! 70: struct stat sb;
! 71: FILE *fp;
! 72: long off;
! 73: enum STYLE style;
! 74: int ch, first;
! 75: char *p;
! 76:
! 77: /*
! 78: * Tail's options are weird. First, -n10 is the same as -n-10, not
! 79: * -n+10. Second, the number options are 1 based and not offsets,
! 80: * so -n+1 is the first line, and -c-1 is the last byte. Third, the
! 81: * number options for the -r option specify the number of things that
! 82: * get displayed, not the starting point in the file. The one major
! 83: * incompatibility in this version as compared to historical versions
! 84: * is that the 'r' option couldn't be modified by the -lbc options,
! 85: * i.e. it was always done in lines. This version treats -rc as a
! 86: * number of characters in reverse order. Finally, the default for
! 87: * -r is the entire file, not 10 lines.
! 88: */
! 89: #define ARG(units, forward, backward) { \
! 90: if (style) \
! 91: usage(); \
! 92: off = strtol(optarg, &p, 10) * (units); \
! 93: if (*p) \
! 94: err(1, "illegal offset -- %s", optarg); \
! 95: switch(optarg[0]) { \
! 96: case '+': \
! 97: if (off) \
! 98: off -= (units); \
! 99: style = (forward); \
! 100: break; \
! 101: case '-': \
! 102: off = -off; \
! 103: /* FALLTHROUGH */ \
! 104: default: \
! 105: style = (backward); \
! 106: break; \
! 107: } \
! 108: }
! 109:
! 110: obsolete(argv);
! 111: style = NOTSET;
! 112: while ((ch = getopt(argc, argv, "b:c:fn:r")) != EOF)
! 113: switch(ch) {
! 114: case 'b':
! 115: ARG(512, FBYTES, RBYTES);
! 116: break;
! 117: case 'c':
! 118: ARG(1, FBYTES, RBYTES);
! 119: break;
! 120: case 'f':
! 121: fflag = 1;
! 122: break;
! 123: case 'n':
! 124: ARG(1, FLINES, RLINES);
! 125: break;
! 126: case 'r':
! 127: rflag = 1;
! 128: break;
! 129: case '?':
! 130: default:
! 131: usage();
! 132: }
! 133: argc -= optind;
! 134: argv += optind;
! 135:
! 136: if (fflag && argc > 1)
! 137: err(1, "-f option only appropriate for a single file");
! 138:
! 139: /*
! 140: * If displaying in reverse, don't permit follow option, and convert
! 141: * style values.
! 142: */
! 143: if (rflag) {
! 144: if (fflag)
! 145: usage();
! 146: if (style == FBYTES)
! 147: style = RBYTES;
! 148: else if (style == FLINES)
! 149: style = RLINES;
! 150: }
! 151:
! 152: /*
! 153: * If style not specified, the default is the whole file for -r, and
! 154: * the last 10 lines if not -r.
! 155: */
! 156: if (style == NOTSET)
! 157: if (rflag) {
! 158: off = 0;
! 159: style = REVERSE;
! 160: } else {
! 161: off = 10;
! 162: style = RLINES;
! 163: }
! 164:
! 165: if (*argv)
! 166: for (first = 1; fname = *argv++;) {
! 167: if ((fp = fopen(fname, "r")) == NULL ||
! 168: fstat(fileno(fp), &sb)) {
! 169: ierr();
! 170: continue;
! 171: }
! 172: if (argc > 1) {
! 173: (void)printf("%s==> %s <==\n",
! 174: first ? "" : "\n", fname);
! 175: first = 0;
! 176: (void)fflush(stdout);
! 177: }
! 178:
! 179: if (rflag)
! 180: reverse(fp, style, off, &sb);
! 181: else
! 182: forward(fp, style, off, &sb);
! 183: (void)fclose(fp);
! 184: }
! 185: else {
! 186: fname = "stdin";
! 187:
! 188: if (fstat(fileno(stdin), &sb)) {
! 189: ierr();
! 190: exit(1);
! 191: }
! 192:
! 193: /*
! 194: * Determine if input is a pipe. 4.4BSD will set the SOCKET
! 195: * bit in the st_mode field for pipes. Fix this then.
! 196: */
! 197: if (lseek(fileno(stdin), (off_t)0, SEEK_CUR) == -1 &&
! 198: errno == ESPIPE) {
! 199: errno = 0;
! 200: fflag = 0; /* POSIX.2 requires this. */
! 201: }
! 202:
! 203: if (rflag)
! 204: reverse(stdin, style, off, &sb);
! 205: else
! 206: forward(stdin, style, off, &sb);
! 207: }
! 208: exit(rval);
! 209: }
! 210:
! 211: /*
! 212: * Convert the obsolete argument form into something that getopt can handle.
! 213: * This means that anything of the form [+-][0-9][0-9]*[lbc][fr] that isn't
! 214: * the option argument for a -b, -c or -n option gets converted.
! 215: */
! 216: static void
! 217: obsolete(argv)
! 218: char *argv[];
! 219: {
! 220: register char *ap, *p, *t;
! 221: int len;
! 222: char *start;
! 223:
! 224: while (ap = *++argv) {
! 225: /* Return if "--" or not an option of any form. */
! 226: if (ap[0] != '-') {
! 227: if (ap[0] != '+')
! 228: return;
! 229: } else if (ap[1] == '-')
! 230: return;
! 231:
! 232: switch(*++ap) {
! 233: /* Old-style option. */
! 234: case '0': case '1': case '2': case '3': case '4':
! 235: case '5': case '6': case '7': case '8': case '9':
! 236:
! 237: /* Malloc space for dash, new option and argument. */
! 238: len = strlen(*argv);
! 239: if ((start = p = malloc(len + 3)) == NULL)
! 240: err(1, "%s", strerror(errno));
! 241: *p++ = '-';
! 242:
! 243: /*
! 244: * Go to the end of the option argument. Save off any
! 245: * trailing options (-3lf) and translate any trailing
! 246: * output style characters.
! 247: */
! 248: t = *argv + len - 1;
! 249: if (*t == 'f' || *t == 'r') {
! 250: *p++ = *t;
! 251: *t-- = '\0';
! 252: }
! 253: switch(*t) {
! 254: case 'b':
! 255: *p++ = 'b';
! 256: *t = '\0';
! 257: break;
! 258: case 'c':
! 259: *p++ = 'c';
! 260: *t = '\0';
! 261: break;
! 262: case 'l':
! 263: *t = '\0';
! 264: /* FALLTHROUGH */
! 265: case '0': case '1': case '2': case '3': case '4':
! 266: case '5': case '6': case '7': case '8': case '9':
! 267: *p++ = 'n';
! 268: break;
! 269: default:
! 270: err(1, "illegal option -- %s", *argv);
! 271: }
! 272: *p++ = *argv[0];
! 273: (void)strcpy(p, ap);
! 274: *argv = start;
! 275: continue;
! 276:
! 277: /*
! 278: * Options w/ arguments, skip the argument and continue
! 279: * with the next option.
! 280: */
! 281: case 'b':
! 282: case 'c':
! 283: case 'n':
! 284: if (!ap[1])
! 285: ++argv;
! 286: /* FALLTHROUGH */
! 287: /* Options w/o arguments, continue with the next option. */
! 288: case 'f':
! 289: case 'r':
! 290: continue;
! 291:
! 292: /* Illegal option, return and let getopt handle it. */
! 293: default:
! 294: return;
! 295: }
! 296: }
! 297: }
! 298:
! 299: static void
! 300: usage()
! 301: {
! 302: (void)fprintf(stderr,
! 303: "usage: tail [-f | -r] [-b # | -c # | -n #] [file ...]\n");
! 304: exit(1);
! 305: }