f140403fca
1) Refactor manpage. 2) De-globalize local values. 3) update usage(). 4) sort local variable declarations. 5) fix wrong argument in strtonum (3 -> 1). 6) argc-argv style, boolean style. 7) check bytes > 0 before accessing b.lines[i][bytes - 1] relying on len only makes sense but let's not push it. 7) don't break on maxlen > (chars - 1) / 2. This didn't even make sense. 8) _correctly_ calculate cols and rows in a readable way. 9) Rewrite loop over rows and cols in a readable way and using putchar in a loop instead of printf-magic or fputs where not necessary.
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/ioctl.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "text.h"
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#include "utf.h"
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s [-c num] [file ...]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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struct winsize w;
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struct linebuf b = EMPTY_LINEBUF;
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size_t chars = 65, maxlen = 0, i, j, k, len, bytes, cols, rows;
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int cflag = 0;
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char *p;
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ARGBEGIN {
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case 'c':
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cflag = 1;
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chars = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
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break;
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default:
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usage();
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} ARGEND;
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if (!cflag) {
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if ((p = getenv("COLUMNS")))
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chars = estrtonum(p, 1, MIN(LLONG_MAX, SIZE_MAX));
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else if (!ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) && w.ws_col > 0)
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chars = w.ws_col;
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}
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if (!argc) {
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getlines(stdin, &b);
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} else {
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for (; *argv; argc--, argv++) {
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if (!(fp = fopen(*argv, "r"))) {
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weprintf("fopen %s:", *argv);
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continue;
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}
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getlines(fp, &b);
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fclose(fp);
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}
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}
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for (i = 0; i < b.nlines; i++) {
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len = utflen(b.lines[i]);
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bytes = strlen(b.lines[i]);
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if (len && bytes && b.lines[i][bytes - 1] == '\n') {
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b.lines[i][bytes - 1] = '\0';
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len--;
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}
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if (len > maxlen)
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maxlen = len;
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}
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for (cols = 1; (cols + 1) * maxlen + cols <= chars; cols++);
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rows = b.nlines / cols + (b.nlines % cols > 0);
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for (i = 0; i < rows; i++) {
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for (j = 0; j < cols && i + j * rows < b.nlines; j++) {
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len = utflen(b.lines[i + j * rows]);
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fputs(b.lines[i + j * rows], stdout);
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if (j < cols - 1)
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for (k = len; k < maxlen + 1; k++)
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putchar(' ');
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}
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putchar('\n');
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}
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return 0;
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}
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