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comparison toys/other/rev.c @ 753:7d258f3c13dc

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Adding implementation of rev including tests
author Elie De Brauwer <eliedebrauwer@gmail.com>
date Sun, 16 Dec 2012 12:31:15 +0100
parents
children 06c32155cb95
comparison
equal deleted inserted replaced
752:d020ee45c227 753:7d258f3c13dc
1 /* rev.c - reverse lines of a set of given input files
2 *
3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
4
5 USE_REV(NEWTOY(rev, NULL, TOYFLAG_USR|TOYFLAG_BIN))
6
7 config REV
8 bool "rev"
9 default y
10 help
11 usage: rev [FILE...]
12
13 Output lines reversed, when no files are given stdin is used.
14 */
15
16 #include "toys.h"
17
18 void do_rev(int fd, char *name)
19 {
20 char *c;
21
22 for (;;) {
23 int len;
24 int i;
25 if (!(c = get_line(fd))) break;
26 len = strlen(c) - 1;
27 i = 0;
28 while ( i <= len/2)
29 {
30 char tmp;
31 tmp = c[i];
32 c[i] = c[len-i];
33 c[len-i] = tmp;
34 i++;
35 }
36 xputs(c);
37 free(c);
38 }
39 }
40
41 void rev_main(void)
42 {
43 loopfiles(toys.optargs, do_rev);
44 }