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annotate toys/echo.c @ 194:30a6db5a95c2

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Add comments about SUSv3 specs (or lack thereof).
author Rob Landley <rob@landley.net>
date Mon, 03 Dec 2007 20:05:57 -0600
parents 25447caf1b4b
children 3227c5316260
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 * See http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html
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6 */
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7
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8 #include "toys.h"
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9
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10 void echo_main(void)
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11 {
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12 int i = 0;
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13 char *arg, *from = "\\abfnrtv", *to = "\\\a\b\f\n\r\t\v";
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14
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15 for (;;) {
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16 arg = toys.optargs[i];
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17 if (!arg) break;
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18 if (i++) xputc(' ');
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19
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20 // Handle -e
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21
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22 if (toys.optflags&2) {
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23 int c, j = 0;
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24 for (;;) {
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25 c = arg[j++];
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26 if (!c) break;
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27 if (c == '\\') {
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28 char *found;
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29 int d = arg[j++];
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30
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31 // handle \escapes
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32
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33 if (d) {
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34 found = strchr(from, d);
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35 if (found) c = to[found-from];
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36 else if (d == 'c') goto done;
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37 else if (d == '0') {
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38 c = 0;
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39 while (arg[j]>='0' && arg[j]<='7')
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40 c = (c*8)+arg[j++]-'0';
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41 }
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42 }
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43 }
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44 xputc(c);
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45 }
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46 } else xprintf("%s", arg);
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47 }
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48
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49 // Output "\n" if no -n
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50 if (!(toys.optflags&1)) xputc('\n');
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51 done:
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52 xflush();
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53 }