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40 lines
703 B
40 lines
703 B
7 months ago
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/* rev.c - reverse lines of a set of given input files
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*
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* Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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USE_REV(NEWTOY(rev, NULL, TOYFLAG_USR|TOYFLAG_BIN))
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config REV
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bool "rev"
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default y
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help
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usage: rev [FILE...]
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Output each line reversed, when no files are given stdin is used.
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*/
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#include "toys.h"
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static void rev_line(char **pline, long len)
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{
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char *line;
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long i;
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if (!pline) return;
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line = *pline;
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if (len && line[len-1]=='\n') line[--len] = 0;
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if (len--) for (i = 0; i <= len/2; i++) {
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char tmp = line[i];
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line[i] = line[len-i];
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line[len-i] = tmp;
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}
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xputs(line);
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}
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void rev_main(void)
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{
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loopfiles_lines(toys.optargs, rev_line);
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}
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