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	rev.c - sbase - suckless unix tools
	git clone git://git.suckless.org/sbase
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	---
	rev.c (1153B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <stdio.h>
	3 #include <string.h>
	4 #include <unistd.h>
	5
	6 #include "text.h"
	7 #include "util.h"
	8
	9 static void
	10 usage(void)
	11 {
	12 eprintf("usage: %s [file ...]\n", argv0);
	13 }
	14
	15 static void
	16 rev(FILE *fp)
	17 {
	18 static char *line = NULL;
	19 static size_t size = 0;
	20 size_t i;
	21 ssize_t n;
	22 int lf;
	23
	24 while ((n = getline(&line, &size, fp)) > 0) {
	25 lf = n && line[n - 1] == '\n';
	26 i = n -= lf;
	27 for (n = 0; i--;) {
	28 if (UTF8_POINT(line[i])) {
	29 n++;
	30 } else {
	31 fwrite(line + i, 1, n + 1, stdout);
	32 n = 0;
	33 }
	34 }
	35 if (n)
	36 fwrite(line, 1, n, stdout);
	37 if (lf)
	38 fputc('\n', stdout);
	39 }
	40 }
	41
	42 int
	43 main(int argc, char *argv[])
	44 {
	45 FILE *fp;
	46 int ret = 0;
	47
	48 ARGBEGIN {
	49 default:
	50 usage();
	51 } ARGEND
	52
	53 if (!argc) {
	54 rev(stdin);
	55 } else {
	56 for (; *argv; argc--, argv++) {
	57 if (!strcmp(*argv, "-")) {
	58 *argv = "<stdin>";
	59 fp = stdin;
	60 } else if (!(fp = fopen(*argv, "r"))) {
	61 weprintf("fopen %s:", *argv);
	62 ret = 1;
	63 continue;
	64 }
	65 rev(fp);
	66 if (fp != stdin && fshut(fp, *argv))
	67 ret = 1;
	68 }
	69 }
	70
	71 ret \|= fshut(stdin, "<stdin>") \| fshut(stdout, "<stdout>");
	72
	73 return ret;
	74 }