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annotate toys/posix/echo.c @ 1775:57f2a26fa92c draft toast

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To ensure that toybox can be installed alongside busybox without confusing update-alternatives, the paths of the links installed by toybox should match those installed by busybox. This is accomplished by changing the flags of a few tools within toybox.
author Paul Barker <paul@paulbarker.me.uk>
date Sat, 04 Apr 2015 11:58:06 -0500
parents 95cb37adb024
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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14
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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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17
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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, *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++) putchar(' ');
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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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54
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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 slash = *(c++), n = unescape(slash);
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61
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62 if (n) out = n;
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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 putchar(out);
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83 }
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84 }
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85
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86 // Output "\n" if no -n
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87 if (!(toys.optflags&FLAG_n)) putchar('\n');
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88 done:
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89 xflush();
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90 }