Initial public busybox upstream commit
[busybox4maemo] / util-linux / hexdump.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * hexdump implementation for busybox
4  * Based on code from util-linux v 2.11l
5  *
6  * Copyright (c) 1989
7  *      The Regents of the University of California.  All rights reserved.
8  *
9  * Licensed under GPLv2 or later, see file License in this tarball for details.
10  */
11
12 #include <getopt.h>
13 #include "libbb.h"
14 #include "dump.h"
15
16 /* This is a NOEXEC applet. Be very careful! */
17
18
19 static void bb_dump_addfile(char *name)
20 {
21         char *p;
22         FILE *fp;
23         char *buf;
24
25         fp = xfopen(name, "r");
26
27         while ((buf = xmalloc_getline(fp)) != NULL) {
28                 p = skip_whitespace(buf);
29
30                 if (*p && (*p != '#')) {
31                         bb_dump_add(p);
32                 }
33                 free(buf);
34         }
35         fclose(fp);
36 }
37
38 static const char *const add_strings[] = {
39         "\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"",         /* b */
40         "\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"",         /* c */
41         "\"%07.7_ax \" 8/2 \"  %05u \" \"\\n\"",        /* d */
42         "\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"",         /* o */
43         "\"%07.7_ax \" 8/2 \"   %04x \" \"\\n\"",       /* x */
44 };
45
46 static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
47
48 static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" USE_FEATURE_HEXDUMP_REVERSE("R");
49
50 static const struct suffix_mult suffixes[] = {
51         { "b", 512 },
52         { "k", 1024 },
53         { "m", 1024*1024 },
54         { }
55 };
56
57 int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
58 int hexdump_main(int argc, char **argv)
59 {
60         const char *p;
61         int ch;
62 #if ENABLE_FEATURE_HEXDUMP_REVERSE
63         FILE *fp;
64         smallint rdump = 0;
65 #endif
66
67         bb_dump_vflag = FIRST;
68         bb_dump_length = -1;
69
70         if (ENABLE_HD && !applet_name[2]) { /* we are "hd" */
71                 ch = 'C';
72                 goto hd_applet;
73         }
74
75         /* We cannot use getopt32: in hexdump options are cumulative.
76          * E.g. "hexdump -C -C file" should dump each line twice */
77         while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
78                 p = strchr(hexdump_opts, ch);
79                 if (!p)
80                         bb_show_usage();
81                 if ((p - hexdump_opts) < 5) {
82                         bb_dump_add(add_first);
83                         bb_dump_add(add_strings[(int)(p - hexdump_opts)]);
84                 }
85                 /* Save a little bit of space below by omitting the 'else's. */
86                 if (ch == 'C') {
87  hd_applet:
88                         bb_dump_add("\"%08.8_Ax\n\"");
89                         bb_dump_add("\"%08.8_ax  \" 8/1 \"%02x \" \"  \" 8/1 \"%02x \" ");
90                         bb_dump_add("\"  |\" 16/1 \"%_p\" \"|\\n\"");
91                 }
92                 if (ch == 'e') {
93                         bb_dump_add(optarg);
94                 } /* else */
95                 if (ch == 'f') {
96                         bb_dump_addfile(optarg);
97                 } /* else */
98                 if (ch == 'n') {
99                         bb_dump_length = xatoi_u(optarg);
100                 } /* else */
101                 if (ch == 's') {
102                         bb_dump_skip = xatoul_range_sfx(optarg, 0, LONG_MAX, suffixes);
103                 } /* else */
104                 if (ch == 'v') {
105                         bb_dump_vflag = ALL;
106                 }
107 #if ENABLE_FEATURE_HEXDUMP_REVERSE
108                 if (ch == 'R') {
109                         rdump = 1;
110                 }
111 #endif
112         }
113
114         if (!bb_dump_fshead) {
115                 bb_dump_add(add_first);
116                 bb_dump_add("\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
117         }
118
119         argv += optind;
120
121 #if !ENABLE_FEATURE_HEXDUMP_REVERSE
122         return bb_dump_dump(argv);
123 #else
124         if (!rdump) {
125                 return bb_dump_dump(argv);
126         }
127
128         /* -R: reverse of 'hexdump -Cv' */
129         fp = stdin;
130         if (!*argv) {
131                 argv--;
132                 goto jump_in;
133         }
134
135         do {
136                 char *buf;
137                 fp = xfopen(*argv, "r");
138  jump_in:
139                 while ((buf = xmalloc_getline(fp)) != NULL) {
140                         p = buf;
141                         while (1) {
142                                 /* skip address or previous byte */
143                                 while (isxdigit(*p)) p++;
144                                 while (*p == ' ') p++;
145                                 /* '|' char will break the line */
146                                 if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
147                                         break;
148                                 putchar(ch);
149                         }
150                         free(buf);
151                 }
152                 fclose(fp);
153         } while (*++argv);
154
155         fflush_stdout_and_exit(EXIT_SUCCESS);
156 #endif
157 }