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annotate toys/echo.c @ 481:e1b9a8579ddb

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mkswap helpstring and argument string
author Elie De Brauwer <eliedebrauwer@gmail.com>
date Sat, 18 Feb 2012 14:13:55 +0100
parents d8ff3b0980cf
children f062652562bd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * echo.c - echo supporting -n and -e.
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30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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4 *
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5 * Copyright 2007 Rob Landley <rob@landley.net>
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6 *
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3227c5316260 Update links and add some more spec comments.
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7 * See http://www.opengroup.org/onlinepubs/009695399/utilities/echo.html
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8
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9 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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10
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11 config ECHO
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12 bool "echo"
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13 default y
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14 help
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15 usage: echo [-ne] [args...]
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16
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17 Write each argument to stdout, with one space between each, followed
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18 by a newline.
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19
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20 -n No trailing newline.
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21 -e Process the following escape sequences:
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22 \\ backslash
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23 \0NNN octal values (1 to 3 digits)
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24 \a alert (beep/flash)
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25 \b backspace
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26 \c stop output here (avoids trailing newline)
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27 \f form feed
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28 \n newline
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29 \r carriage return
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30 \t horizontal tab
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31 \v vertical tab
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32 \xHH hexadecimal values (1 to 2 digits)
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33 */
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34
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35 #include "toys.h"
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36
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37 void echo_main(void)
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38 {
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39 int i = 0;
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40 char *arg, *from = "\\abfnrtv", *to = "\\\a\b\f\n\r\t\v";
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41
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42 for (;;) {
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43 arg = toys.optargs[i];
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44 if (!arg) break;
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45 if (i++) xputc(' ');
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46
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47 // Handle -e
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48
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49 if (toys.optflags&2) {
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50 int c, j = 0;
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51 for (;;) {
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52 c = arg[j++];
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53 if (!c) break;
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54 if (c == '\\') {
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55 char *found;
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56 int d = arg[j++];
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57
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58 // handle \escapes
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60 if (d) {
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61 found = strchr(from, d);
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62 if (found) c = to[found-from];
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63 else if (d == 'c') goto done;
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64 else if (d == '0') {
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65 int n = 0;
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66 c = 0;
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67 while (arg[j]>='0' && arg[j]<='7' && n++<3)
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68 c = (c*8)+arg[j++]-'0';
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69 } else if (d == 'x') {
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70 int n = 0;
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71 c = 0;
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72 while (n++<2) {
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73 if (arg[j]>='0' && arg[j]<='9')
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74 c = (c*16)+arg[j++]-'0';
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75 else {
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76 int temp = tolower(arg[j]);
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77 if (temp>='a' && temp<='f') {
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78 c = (c*16)+temp-'a'+10;
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79 j++;
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80 } else break;
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81 }
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82 }
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83 }
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84 }
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85 }
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86 xputc(c);
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87 }
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88 } else xprintf("%s", arg);
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89 }
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90
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91 // Output "\n" if no -n
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92 if (!(toys.optflags&1)) xputc('\n');
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93 done:
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94 xflush();
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95 }