sbase

suckless unix tools
git clone git://git.2f30.org/sbase
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rev.c (1158B)


      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 ((line[i] & 0xC0) == 0x80) {
     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 }