sbase/cols.c

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C
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/* See LICENSE file for copyright and license details. */
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
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#include "text.h"
#include "util.h"
static long chars = 65;
static int cflag;
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static struct linebuf b = EMPTY_LINEBUF;
static long n_columns;
static long n_rows;
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static void
usage(void)
{
eprintf("usage: %s [-c chars] [FILE...]\n", argv0);
}
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int
main(int argc, char *argv[])
{
long i, l, col;
size_t len;
int maxlen = 0;
struct winsize w;
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FILE *fp;
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ARGBEGIN {
case 'c':
cflag = 1;
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chars = estrtol(EARGF(usage()), 0);
if(chars < 3)
eprintf("%d: too few character columns");
break;
default:
usage();
} ARGEND;
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if (cflag == 0) {
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
if (w.ws_col != 0)
chars = w.ws_col;
}
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/* XXX librarify this chunk, too? only useful in sponges though */
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if(argc == 0) {
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getlines(stdin, &b);
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} else for(; argc > 0; argc--, argv++) {
if(!(fp = fopen(argv[0], "r")))
eprintf("fopen %s:", argv[0]);
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getlines(fp, &b);
fclose(fp);
}
for(l = 0; l < b.nlines; ++l) {
len = strlen(b.lines[l]);
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if(len > 0 && b.lines[l][len-1] == '\n')
b.lines[l][--len] = '\0';
if(len > maxlen)
maxlen = len;
if(maxlen > (chars - 1) / 2)
break;
}
n_columns = (chars + 1) / (maxlen + 1);
if(n_columns <= 1) {
for(l = 0; l < b.nlines; ++l) {
fputs(b.lines[l], stdout);
}
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return 0;
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}
n_rows = (b.nlines + (n_columns - 1)) / n_columns;
for(i = 0; i < n_rows; ++i) {
for(l = i, col = 1; l < b.nlines; l += n_rows, ++col) {
len = strlen(b.lines[l]);
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fputs(b.lines[l], stdout);
if(col < n_columns)
printf("%*s", maxlen + 1 - (int)len, "");
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}
fputs("\n", stdout);
}
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return 0;
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}