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d8c2a3f5 WJ |
1 | /* |
2 | * Copyright (c) 1980, 1987 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1980, 1987 The Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)strings.c 5.10 (Berkeley) 5/23/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <sys/types.h> | |
45 | #include <fcntl.h> | |
46 | #include <errno.h> | |
47 | #include <a.out.h> | |
48 | #include <unistd.h> | |
49 | #include <stdio.h> | |
50 | #include <ctype.h> | |
51 | #include <stdlib.h> | |
52 | #include <string.h> | |
53 | ||
54 | #define DEF_LEN 4 /* default minimum string length */ | |
55 | #define ISSTR(ch) (isascii(ch) && (isprint(ch) || ch == '\t')) | |
56 | ||
57 | typedef struct exec EXEC; /* struct exec cast */ | |
58 | ||
59 | static long foff; /* offset in the file */ | |
60 | static int hcnt, /* head count */ | |
61 | head_len, /* length of header */ | |
62 | read_len; /* length to read */ | |
63 | static u_char hbfr[sizeof(EXEC)]; /* buffer for struct exec */ | |
64 | ||
65 | static void usage(); | |
66 | ||
67 | main(argc, argv) | |
68 | int argc; | |
69 | char **argv; | |
70 | { | |
71 | extern char *optarg; | |
72 | extern int optind; | |
73 | register int ch, cnt; | |
74 | register u_char *C; | |
75 | EXEC *head; | |
76 | int exitcode, minlen; | |
77 | short asdata, oflg, fflg; | |
78 | u_char *bfr; | |
79 | char *file, *p; | |
80 | ||
81 | /* | |
82 | * for backward compatibility, allow '-' to specify 'a' flag; no | |
83 | * longer documented in the man page or usage string. | |
84 | */ | |
85 | asdata = exitcode = fflg = oflg = 0; | |
86 | minlen = -1; | |
87 | while ((ch = getopt(argc, argv, "-0123456789anof")) != EOF) | |
88 | switch((char)ch) { | |
89 | case '0': case '1': case '2': case '3': case '4': | |
90 | case '5': case '6': case '7': case '8': case '9': | |
91 | /* | |
92 | * kludge: strings was originally designed to take | |
93 | * a number after a dash. | |
94 | */ | |
95 | if (minlen == -1) { | |
96 | p = argv[optind - 1]; | |
97 | if (p[0] == '-' && p[1] == ch && !p[2]) | |
98 | minlen = atoi(++p); | |
99 | else | |
100 | minlen = atoi(argv[optind] + 1); | |
101 | } | |
102 | break; | |
103 | case '-': | |
104 | case 'a': | |
105 | asdata = 1; | |
106 | break; | |
107 | case 'f': | |
108 | fflg = 1; | |
109 | break; | |
110 | case 'n': | |
111 | minlen = atoi(optarg); | |
112 | break; | |
113 | case 'o': | |
114 | oflg = 1; | |
115 | break; | |
116 | case '?': | |
117 | default: | |
118 | usage(); | |
119 | } | |
120 | argc -= optind; | |
121 | argv += optind; | |
122 | ||
123 | if (minlen == -1) | |
124 | minlen = DEF_LEN; | |
125 | ||
126 | if (!(bfr = malloc((u_int)minlen))) { | |
127 | (void)fprintf(stderr, "strings: %s\n", strerror(errno)); | |
128 | exit(1); | |
129 | } | |
130 | bfr[minlen] = '\0'; | |
131 | file = "stdin"; | |
132 | do { | |
133 | if (*argv) { | |
134 | file = *argv++; | |
135 | if (!freopen(file, "r", stdin)) { | |
136 | (void)fprintf(stderr, | |
137 | "strings: %s: %s\n", file, strerror(errno)); | |
138 | exitcode = 1; | |
139 | goto nextfile; | |
140 | } | |
141 | } | |
142 | foff = 0; | |
143 | #define DO_EVERYTHING() {read_len = -1; head_len = 0; goto start;} | |
144 | read_len = -1; | |
145 | if (asdata) | |
146 | DO_EVERYTHING() | |
147 | else { | |
148 | head = (EXEC *)hbfr; | |
149 | if ((head_len = | |
150 | read(fileno(stdin), head, sizeof(EXEC))) == -1) | |
151 | DO_EVERYTHING() | |
152 | if (head_len == sizeof(EXEC) && !N_BADMAG(*head)) { | |
153 | foff = N_TXTOFF(*head); | |
154 | if (fseek(stdin, foff, SEEK_SET) == -1) | |
155 | DO_EVERYTHING() | |
156 | read_len = head->a_text + head->a_data; | |
157 | head_len = 0; | |
158 | } | |
159 | else | |
160 | hcnt = 0; | |
161 | } | |
162 | start: | |
163 | for (cnt = 0; (ch = getch()) != EOF;) { | |
164 | if (ISSTR(ch)) { | |
165 | if (!cnt) | |
166 | C = bfr; | |
167 | *C++ = ch; | |
168 | if (++cnt < minlen) | |
169 | continue; | |
170 | if (fflg) | |
171 | printf("%s:", file); | |
172 | if (oflg) | |
173 | printf("%07ld %s", | |
174 | foff - minlen, (char *)bfr); | |
175 | else | |
176 | printf("%s", bfr); | |
177 | while ((ch = getch()) != EOF && ISSTR(ch)) | |
178 | putchar((char)ch); | |
179 | putchar('\n'); | |
180 | } | |
181 | cnt = 0; | |
182 | } | |
183 | nextfile: ; | |
184 | } while (*argv); | |
185 | exit(exitcode); | |
186 | } | |
187 | ||
188 | /* | |
189 | * getch -- | |
190 | * get next character from wherever | |
191 | */ | |
192 | getch() | |
193 | { | |
194 | ++foff; | |
195 | if (head_len) { | |
196 | if (hcnt < head_len) | |
197 | return((int)hbfr[hcnt++]); | |
198 | head_len = 0; | |
199 | } | |
200 | if (read_len == -1 || read_len-- > 0) | |
201 | return(getchar()); | |
202 | return(EOF); | |
203 | } | |
204 | ||
205 | static void | |
206 | usage() | |
207 | { | |
208 | (void)fprintf(stderr, | |
209 | "usage: strings [-afo] [-n length] [file ... ]\n"); | |
210 | exit(1); | |
211 | } |