Mercurial > hg > toybox
annotate toys/posix/echo.c @ 1676:cbb1aca81eca draft
Make toy_exec() check if argc is in optargs and deal with it there so we don't need a separate xexec_optargs().
author | Rob Landley <rob@landley.net> |
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date | Sat, 07 Feb 2015 16:17:44 -0600 |
parents | 95cb37adb024 |
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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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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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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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40 |
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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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45 |
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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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52 |
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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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57 |
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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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Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents:
674
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changeset
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89 xflush(); |
71
40103a3ddcb0
Helps to "hg add" echo.c. Also, implement \0123 escapes for -e.
Rob Landley <rob@landley.net>
parents:
diff
changeset
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90 } |