From fadbd6078081afe62cf120f9346b1d69aa79d486 Mon Sep 17 00:00:00 2001 From: Elie De Brauwer Date: Sun, 16 Dec 2012 12:31:15 +0100 Subject: Adding implementation of rev including tests --- toys/other/rev.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 toys/other/rev.c (limited to 'toys/other/rev.c') diff --git a/toys/other/rev.c b/toys/other/rev.c new file mode 100644 index 00000000..a95d6615 --- /dev/null +++ b/toys/other/rev.c @@ -0,0 +1,44 @@ +/* rev.c - reverse lines of a set of given input files + * + * Copyright 2012 Elie De Brauwer + +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); +} -- cgit v1.2.3