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	cols.c - sbase - suckless unix tools
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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…
	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_c…
	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].l…
	83 if (UTF8_POINT(b.lines[i + j * rows].dat…
	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 }