1 /* cat.c - copy inputs to stdout.
2 *
3 * Copyright 2006 Rob Landley <rob@landley.net>
4 *
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/cat.html
6 *
7 * And "Cat -v considered harmful" at
8 * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
9
10 USE_CAT(NEWTOY(cat, "u"USE_CAT_V("vte"), TOYFLAG_BIN))
11 USE_CATV(NEWTOY(catv, USE_CATV("vte"), TOYFLAG_USR|TOYFLAG_BIN))
12
13 config CAT
14 bool "cat"
15 default y
16 help
17 usage: cat [-u] [file...]
18
19 Copy (concatenate) files to stdout. If no files listed, copy from stdin.
20 Filename "-" is a synonym for stdin.
21
22 -u Copy one byte at a time (slow).
23
24 config CAT_V
25 bool "cat -etv"
26 default n
27 depends on CAT
28 help
29 usage: cat [-evt]
30
31 -e Mark each newline with $
32 -t Show tabs as ^I
33 -v Display nonprinting characters as escape sequences. Use M-x for
34 high ascii characters (>127), and ^x for other nonprinting chars.
35
36 config CATV
37 bool "catv"
38 default y
39 help
40 usage: catv [-evt] [filename...]
41
42 Display nonprinting characters as escape sequences. Use M-x for
43 high ascii characters (>127), and ^x for other nonprinting chars.
44
45 -e Mark each newline with $
46 -t Show tabs as ^I
47 -v Don't use ^x or M-x escapes.
48 */
49
50 #define FOR_cat
51 #define FORCE_FLAGS
52 #include "toys.h"
53
do_cat(int fd,char * name)54 static void do_cat(int fd, char *name)
55 {
56 int i, len, size=(toys.optflags & FLAG_u) ? 1 : sizeof(toybuf);
57
58 for(;;) {
59 len = read(fd, toybuf, size);
60 if (len < 0) {
61 toys.exitval = EXIT_FAILURE;
62 perror_msg_raw(name);
63 }
64 if (len < 1) break;
65 if ((CFG_CAT_V || CFG_CATV) && (toys.optflags&~FLAG_u)) {
66 for (i=0; i<len; i++) {
67 char c=toybuf[i];
68
69 if (c > 126 && (toys.optflags & FLAG_v)) {
70 if (c > 127) {
71 printf("M-");
72 c -= 128;
73 }
74 if (c == 127) {
75 printf("^?");
76 continue;
77 }
78 }
79 if (c < 32) {
80 if (c == 10) {
81 if (toys.optflags & FLAG_e) xputc('$');
82 } else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
83 printf("^%c", c+'@');
84 continue;
85 }
86 }
87 xputc(c);
88 }
89 } else xwrite(1, toybuf, len);
90 }
91 }
92
cat_main(void)93 void cat_main(void)
94 {
95 loopfiles(toys.optargs, do_cat);
96 }
97
catv_main(void)98 void catv_main(void)
99 {
100 toys.optflags ^= FLAG_v;
101 loopfiles(toys.optargs, do_cat);
102 }
103