sbase

suckless unix tools
git clone git://git.2f30.org/sbase.git
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cols.c (2087B)


      1 /* See LICENSE file for copyright and license details. */
      2 #include <sys/ioctl.h>
      3 
      4 #include <limits.h>
      5 #include <stdint.h>
      6 #include <stdio.h>
      7 #include <stdlib.h>
      8 #include <string.h>
      9 #include <unistd.h>
     10 
     11 #include "text.h"
     12 #include "util.h"
     13 
     14 static void
     15 usage(void)
     16 {
     17 	eprintf("usage: %s [-c num] [file ...]\n", argv0);
     18 }
     19 
     20 int
     21 main(int argc, char *argv[])
     22 {
     23 	FILE *fp;
     24 	struct winsize w;
     25 	struct linebuf b = EMPTY_LINEBUF;
     26 	size_t chars = 65, maxlen = 0, i, j, k, len, cols, rows;
     27 	int cflag = 0, ret = 0;
     28 	char *p;
     29 
     30 	ARGBEGIN {
     31 	case 'c':
     32 		cflag = 1;
     33 		chars = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
     34 		break;
     35 	default:
     36 		usage();
     37 	} ARGEND
     38 
     39 	if (!cflag) {
     40 		if ((p = getenv("COLUMNS")))
     41 			chars = estrtonum(p, 1, MIN(LLONG_MAX, SIZE_MAX));
     42 		else if (!ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) && w.ws_col > 0)
     43 			chars = w.ws_col;
     44 	}
     45 
     46 	if (!argc) {
     47 		getlines(stdin, &b);
     48 	} else {
     49 		for (; *argv; argc--, argv++) {
     50 			if (!strcmp(*argv, "-")) {
     51 				*argv = "<stdin>";
     52 				fp = stdin;
     53 			} else if (!(fp = fopen(*argv, "r"))) {
     54 				weprintf("fopen %s:", *argv);
     55 				ret = 1;
     56 				continue;
     57 			}
     58 			getlines(fp, &b);
     59 			if (fp != stdin && fshut(fp, *argv))
     60 				ret = 1;
     61 		}
     62 	}
     63 
     64 	for (i = 0; i < b.nlines; i++) {
     65 		for (j = 0, len = 0; j < b.lines[i].len; j++) {
     66 			if (UTF8_POINT(b.lines[i].data[j]))
     67 				len++;
     68 		}
     69 		if (len && b.lines[i].data[b.lines[i].len - 1] == '\n') {
     70 			b.lines[i].data[--(b.lines[i].len)] = '\0';
     71 			len--;
     72 		}
     73 		if (len > maxlen)
     74 			maxlen = len;
     75 	}
     76 
     77 	for (cols = 1; (cols + 1) * maxlen + cols <= chars; cols++);
     78 	rows = b.nlines / cols + (b.nlines % cols > 0);
     79 
     80 	for (i = 0; i < rows; i++) {
     81 		for (j = 0; j < cols && i + j * rows < b.nlines; j++) {
     82 			for (k = 0, len = 0; k < b.lines[i + j * rows].len; k++) {
     83 				if (UTF8_POINT(b.lines[i + j * rows].data[k]))
     84 					len++;
     85 			}
     86 			fwrite(b.lines[i + j * rows].data, 1,
     87 			       b.lines[i + j * rows].len, stdout);
     88 			if (j < cols - 1)
     89 				for (k = len; k < maxlen + 1; k++)
     90 					putchar(' ');
     91 		}
     92 		putchar('\n');
     93 	}
     94 
     95 	ret |= fshut(stdin, "<stdin>") | fshut(stdout, "<stdout>");
     96 
     97 	return ret;
     98 }