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222 lines
5.6 KiB
C
222 lines
5.6 KiB
C
/*
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* Copyright (c) 1980, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1980, 1987, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)strings.c 8.2 (Berkeley) 1/28/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <a.out.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define DEF_LEN 4 /* default minimum string length */
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#define ISSTR(ch) (isalnum(ch) || ispunct(ch) || \
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isspace(ch) && (!iscntrl(ch) || ch == '\t') || \
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isascii(ch) && isprint(ch))
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typedef struct exec EXEC; /* struct exec cast */
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static long foff; /* offset in the file */
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static int hcnt, /* head count */
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head_len, /* length of header */
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read_len; /* length to read */
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static u_char hbfr[sizeof(EXEC)]; /* buffer for struct exec */
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static void usage();
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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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extern char *optarg;
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extern int optind;
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register int ch, cnt;
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register u_char *C;
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EXEC *head;
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int exitcode, minlen;
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short asdata, oflg, fflg;
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u_char *bfr;
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char *file, *p;
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(void) setlocale(LC_CTYPE, "");
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/*
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* for backward compatibility, allow '-' to specify 'a' flag; no
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* longer documented in the man page or usage string.
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*/
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asdata = exitcode = fflg = oflg = 0;
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minlen = -1;
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while ((ch = getopt(argc, argv, "-0123456789an:of")) != EOF)
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switch (ch) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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/*
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* kludge: strings was originally designed to take
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* a number after a dash.
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*/
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if (minlen == -1) {
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p = argv[optind - 1];
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if (p[0] == '-' && p[1] == ch && !p[2])
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minlen = atoi(++p);
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else
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minlen = atoi(argv[optind] + 1);
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}
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break;
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case '-':
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case 'a':
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asdata = 1;
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break;
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case 'f':
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fflg = 1;
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break;
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case 'n':
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minlen = atoi(optarg);
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break;
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case 'o':
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oflg = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (minlen == -1)
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minlen = DEF_LEN;
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else if (minlen < 1) {
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(void)fprintf(stderr, "strings: length less than 1\n");
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exit (1);
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}
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if (!(bfr = malloc((u_int)minlen))) {
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(void)fprintf(stderr, "strings: %s\n", strerror(errno));
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exit(1);
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}
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bfr[minlen] = '\0';
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file = "stdin";
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do {
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if (*argv) {
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file = *argv++;
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if (!freopen(file, "r", stdin)) {
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(void)fprintf(stderr,
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"strings: %s: %s\n", file, strerror(errno));
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exitcode = 1;
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goto nextfile;
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}
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}
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foff = 0;
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#define DO_EVERYTHING() {read_len = -1; head_len = 0; goto start;}
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read_len = -1;
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if (asdata)
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DO_EVERYTHING()
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else {
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head = (EXEC *)hbfr;
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if ((head_len =
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read(fileno(stdin), head, sizeof(EXEC))) == -1)
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DO_EVERYTHING()
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if (head_len == sizeof(EXEC) && !N_BADMAG(*head)) {
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foff = N_TXTOFF(*head);
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if (fseek(stdin, foff, SEEK_SET) == -1)
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DO_EVERYTHING()
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read_len = head->a_text + head->a_data;
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head_len = 0;
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}
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else
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hcnt = 0;
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}
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start:
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for (cnt = 0; (ch = getch()) != EOF;) {
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if (ISSTR(ch)) {
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if (!cnt)
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C = bfr;
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*C++ = ch;
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if (++cnt < minlen)
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continue;
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if (fflg)
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printf("%s:", file);
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if (oflg)
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printf("%07ld %s",
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foff - minlen, (char *)bfr);
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else
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printf("%s", bfr);
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while ((ch = getch()) != EOF && ISSTR(ch))
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putchar((char)ch);
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putchar('\n');
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}
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cnt = 0;
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}
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nextfile: ;
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} while (*argv);
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exit(exitcode);
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}
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/*
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* getch --
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* get next character from wherever
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*/
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getch()
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{
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++foff;
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if (head_len) {
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if (hcnt < head_len)
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return((int)hbfr[hcnt++]);
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head_len = 0;
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}
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if (read_len == -1 || read_len-- > 0)
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return(getchar());
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return(EOF);
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}
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static void
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usage()
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{
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(void)fprintf(stderr,
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"usage: strings [-afo] [-n length] [file ... ]\n");
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exit(1);
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}
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