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annotate toys/other/catv.c @ 818:264b9da809df

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Simplify license text, as mentioned on the mailing list. Reasoning: it was never my intent to require anybody to copy license text into another project if they cut and pasted something out of toybox. The "permission for any purpose" is as close to public domain as you can get in our current screwed up legal system without making people uncomfortable the _other_ way. (Besides, my initial reading of that was "all copies of the source code" but that's not what it says, and somebody pointed out that Android has "show license text" options because paranoid lawyers think that sort of thing applies to the BINARY version, which is nuts.)
author Rob Landley <rob@landley.net>
date Thu, 14 Mar 2013 09:02:37 -0500
parents 786841fdb1e0
children
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1 /* cat -v implementation for toybox
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2 *
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3 * Copyright (C) 2006, 2007 Rob Landley <rob@landley.net>
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4 *
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5 * See "Cat -v considered harmful" at
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6 * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
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163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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8 USE_CATV(NEWTOY(catv, "vte", TOYFLAG_USR|TOYFLAG_BIN))
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9
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10 config CATV
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11 bool "catv"
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12 default y
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13 help
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14 usage: catv [-evt] [filename...]
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16 Display nonprinting characters as escape sequences. Use M-x for
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17 high ascii characters (>127), and ^x for other nonprinting chars.
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19 -e Mark each newline with $
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20 -t Show tabs as ^I
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21 -v Don't use ^x or M-x escapes.
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22 */
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23
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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24 #define FOR_catv
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25 #include "toys.h"
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27 // Callback function for loopfiles()
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29 static void do_catv(int fd, char *name)
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30 {
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31 for(;;) {
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32 int i, len;
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34 len = read(fd, toybuf, sizeof(toybuf));
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35 if (len < 0) toys.exitval = EXIT_FAILURE;
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36 if (len < 1) break;
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37 for (i=0; i<len; i++) {
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38 char c=toybuf[i];
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40 if (c > 126 && (toys.optflags & FLAG_v)) {
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41 if (c > 127) {
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42 printf("M-");
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43 c -= 128;
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44 }
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45 if (c == 127) {
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46 printf("^?");
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47 continue;
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48 }
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49 }
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50 if (c < 32) {
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51 if (c == 10) {
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52 if (toys.optflags & FLAG_e) xputc('$');
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53 } else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
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54 printf("^%c", c+'@');
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55 continue;
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56 }
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57 }
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58 xputc(c);
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59 }
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60 }
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61 }
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63 void catv_main(void)
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64 {
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65 toys.optflags ^= FLAG_v;
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66 loopfiles(toys.optargs, do_catv);
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67 }