| /* 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 each line reversed, when no files are given stdin is used. |
| */ |
| |
| #include "toys.h" |
| |
| static void rev_line(char **pline, long len) |
| { |
| char *line; |
| long i; |
| |
| if (!pline) return; |
| line = *pline; |
| if (len && line[len-1]=='\n') line[--len] = 0; |
| |
| if (len--) for (i = 0; i <= len/2; i++) { |
| char tmp = line[i]; |
| |
| line[i] = line[len-i]; |
| line[len-i] = tmp; |
| } |
| xputs(line); |
| } |
| |
| void rev_main(void) |
| { |
| loopfiles_lines(toys.optargs, rev_line); |
| } |