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annotate toys/other/tac.c @ 656:6df4ccc0acbe

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Regularize command headers, update links to standards documents.
author Rob Landley <rob@landley.net>
date Sat, 25 Aug 2012 18:08:51 -0500
parents 2986aa63a021
children 786841fdb1e0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
522
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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1 /* vi: set sw=4 ts=4:
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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2 *
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3 * tac.c - output lines in reverse order
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4 *
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5 * Copyright 2012 Rob Landley <rob@landley.net>
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6
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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7 USE_TAC(NEWTOY(tac, NULL, TOYFLAG_USR|TOYFLAG_BIN))
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8
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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9 config TAC
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10 bool "tac"
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11 default y
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12 help
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13 usage: tac [FILE...]
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14
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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15 Output lines in reverse order.
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16 */
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17
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18 #include "toys.h"
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19
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20 void do_tac(int fd, char *name)
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21 {
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22 struct arg_list *list = NULL;
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23 char *c;
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24
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25 // Read in lines
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26 for (;;) {
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27 struct arg_list *temp;
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28 int len;
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29
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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30 if (!(c = get_line(fd))) break;
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31
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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32 len = strlen(c);
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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33 if (len && c[len-1]=='\n') c[len-1] = 0;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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34 temp = xmalloc(sizeof(struct arg_list));
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35 temp->next = list;
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36 temp->arg = c;
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37 list = temp;
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38 }
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39
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40 // Play them back.
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41 while (list) {
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42 struct arg_list *temp = list->next;
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43 xputs(list->arg);
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44 free(list->arg);
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45 free(list);
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46 list = temp;
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47 }
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
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48 }
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49
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50 void tac_main(void)
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51 {
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52 loopfiles(toys.optargs, do_tac);
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53 }