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annotate toys/posix/echo.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 95cb37adb024
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* echo.c - echo supporting -n and -e.
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2 *
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3 * Copyright 2007 Rob Landley <rob@landley.net>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/echo.html
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6
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7 USE_ECHO(NEWTOY(echo, "^?en", TOYFLAG_BIN))
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163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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8
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9 config ECHO
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10 bool "echo"
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11 default y
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12 help
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13 usage: echo [-ne] [args...]
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15 Write each argument to stdout, with one space between each, followed
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16 by a newline.
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18 -n No trailing newline.
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19 -e Process the following escape sequences:
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20 \\ backslash
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21 \0NNN octal values (1 to 3 digits)
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22 \a alert (beep/flash)
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23 \b backspace
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24 \c stop output here (avoids trailing newline)
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25 \f form feed
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26 \n newline
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27 \r carriage return
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28 \t horizontal tab
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29 \v vertical tab
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30 \xHH hexadecimal values (1 to 2 digits)
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31 */
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32
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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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33 #define FOR_echo
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34 #include "toys.h"
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35
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36 void echo_main(void)
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37 {
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38 int i = 0, out;
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39 char *arg, *from = "\\abfnrtv", *to = "\\\a\b\f\n\r\t\v", *c;
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41 for (;;) {
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42 arg = toys.optargs[i];
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43 if (!arg) break;
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44 if (i++) xputc(' ');
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46 // Should we output arg verbatim?
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47
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48 if (!(toys.optflags & FLAG_e)) {
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49 xprintf("%s", arg);
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50 continue;
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51 }
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53 // Handle -e
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55 for (c=arg;;) {
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56 if (!(out = *(c++))) break;
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58 // handle \escapes
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59 if (out == '\\' && *c) {
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60 int n = 0, slash = *(c++);
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61 char *found = strchr(from, slash);
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62 if (found) out = to[found-from];
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63 else if (slash == 'c') goto done;
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64 else if (slash == '0') {
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65 out = 0;
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66 while (*c>='0' && *c<='7' && n++<3) out = (out*8)+*(c++)-'0';
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67 } else if (slash == 'x') {
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68 out = 0;
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69 while (n++<2) {
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70 if (*c>='0' && *c<='9') out = (out*16)+*(c++)-'0';
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71 else {
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72 int temp = tolower(*c);
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73 if (temp>='a' && temp<='f') {
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74 out = (out*16)+temp-'a'+10;
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75 c++;
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76 } else break;
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77 }
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78 }
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79 // Slash in front of unknown character, print literal.
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80 } else c--;
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81 }
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82 xputc(out);
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83 }
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84 }
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86 // Output "\n" if no -n
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87 if (!(toys.optflags&FLAG_n)) xputc('\n');
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88 done:
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89 xflush();
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90 }