Mercurial > hg > toybox
view toys/other/rev.c @ 753:7d258f3c13dc
Adding implementation of rev including tests
author | Elie De Brauwer <eliedebrauwer@gmail.com> |
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date | Sun, 16 Dec 2012 12:31:15 +0100 |
parents | |
children | 06c32155cb95 |
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/* rev.c - reverse lines of a set of given input files * * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com> USE_REV(NEWTOY(rev, NULL, TOYFLAG_USR|TOYFLAG_BIN)) config REV bool "rev" default y help usage: rev [FILE...] Output lines reversed, when no files are given stdin is used. */ #include "toys.h" void do_rev(int fd, char *name) { char *c; for (;;) { int len; int i; if (!(c = get_line(fd))) break; len = strlen(c) - 1; i = 0; while ( i <= len/2) { char tmp; tmp = c[i]; c[i] = c[len-i]; c[len-i] = tmp; i++; } xputs(c); free(c); } } void rev_main(void) { loopfiles(toys.optargs, do_rev); }