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annotate toys/echo.c @ 186:25447caf1b4b

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Change command main() functions to return void, and exit(toys.exitval) from the toybox infrastructure instead. Eliminates a return call from each command.
author Rob Landley <rob@landley.net>
date Thu, 29 Nov 2007 18:14:37 -0600
parents 1e8f4b05cb65
children 30a6db5a95c2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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40103a3ddcb0 Helps to "hg add" echo.c. Also, implement \0123 escapes for -e.
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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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4 */
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5
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6 #include "toys.h"
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7
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8 void echo_main(void)
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9 {
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10 int i = 0;
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11 char *arg, *from = "\\abfnrtv", *to = "\\\a\b\f\n\r\t\v";
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12
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13 for (;;) {
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14 arg = toys.optargs[i];
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15 if (!arg) break;
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16 if (i++) xputc(' ');
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17
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18 // Handle -e
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19
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20 if (toys.optflags&2) {
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21 int c, j = 0;
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22 for (;;) {
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23 c = arg[j++];
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24 if (!c) break;
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25 if (c == '\\') {
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26 char *found;
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27 int d = arg[j++];
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28
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29 // handle \escapes
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30
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31 if (d) {
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32 found = strchr(from, d);
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33 if (found) c = to[found-from];
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34 else if (d == 'c') goto done;
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35 else if (d == '0') {
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36 c = 0;
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37 while (arg[j]>='0' && arg[j]<='7')
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38 c = (c*8)+arg[j++]-'0';
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39 }
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40 }
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41 }
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42 xputc(c);
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43 }
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44 } else xprintf("%s", arg);
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45 }
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46
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47 // Output "\n" if no -n
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48 if (!(toys.optflags&1)) xputc('\n');
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49 done:
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50 xflush();
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51 }