sbase/col.c

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3.3 KiB
C
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/* See LICENSE file for copyright and license details. */
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "utf.h"
#include "util.h"
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#define NLINES 128
#define NCOLS 800
static Rune **buf;
static int backspace, notabs, halfline, escape;
static size_t nline, ncol, nchar, nspaces, maxline, bs, pagesize = NLINES;
static void
flush(void)
{
Rune c;
size_t i, j;
for (i = 0; i < maxline; ++i) {
for (j = 0; j < NCOLS && (c = buf[i][j]); ++j)
efputrune(&c, stdout, "<stdout>");
putchar('\n');
}
bs = nchar = nline = ncol = 0;
}
static void
forward(size_t n)
{
size_t lim;
for (lim = ncol + n; ncol != lim && nchar < NCOLS - 1; ++nchar) {
switch (buf[nline][nchar]) {
case '\b':
--ncol;
break;
case '\0':
buf[nline][nchar] = ' ';
/* FALLTHROUGH */
default:
++ncol;
break;
}
}
}
static void
linefeed(int up, int rcarriage)
{
size_t oncol = ncol;
nspaces = 0;
if (up > 0) {
if (nline == pagesize - 1) {
flush();
} else {
if (++nline > maxline)
maxline = nline;
}
} else if (nline > 0) {
--nline;
}
bs = 0;
if (rcarriage) {
forward(oncol);
nchar = ncol = 0;
}
}
static void
newchar(Rune c)
{
Rune *cp;
forward(nspaces);
nspaces = 0;
switch (c) {
case ' ':
forward(1);
break;
case '\r':
nchar = ncol = 0;
break;
case '\t':
forward(8 - ncol % 8);
break;
case '\b':
if (ncol > 0)
--ncol;
if (nchar > 0)
--nchar;
bs = 1;
break;
default:
cp = &buf[nline][nchar];
if (*cp && *cp != ' ' && bs && !backspace && nchar != NCOLS - 3) {
memmove(cp + 3, cp + 1, (NCOLS - nchar - 2) * sizeof(*cp));
cp[1] = '\b';
nchar += 2;
}
if (nchar != NCOLS - 1) {
for (cp = buf[nline]; cp < &buf[nline][nchar]; ++cp) {
if (*cp == '\0')
*cp = ' ';
}
buf[nline][nchar++] = c;
++ncol;
}
bs = 0;
}
}
static void
col(void)
{
Rune r;
int ret;
while (efgetrune(&r, stdin, "<stdin>")) {
switch (r) {
case '\x1b':
ret = efgetrune(&r, stdin, "<stdin>");
switch (r) {
case '8': /* reverse half-line-feed */
case '7': /* reverse line-feed */
linefeed(-1, 0);
continue;
case '9': /* forward half-line-feed */
if (halfline)
break;
linefeed(1, 0);
continue;
}
if (!escape)
continue;
newchar('\x1b');
if (ret)
newchar(r);
break;
case '\v':
linefeed(-1, 0);
break;
case ' ':
if (!notabs) {
if (++nspaces != 8)
continue;
r = '\t';
nspaces = 0;
}
/* FALLTHROUGH */
case '\r':
case '\b':
case '\t':
newchar(r);
break;
case '\n':
linefeed(1, 1);
break;
default:
if (!iscntrlrune(r))
newchar(r);
break;
}
}
}
static void
allocbuf(void)
{
Rune **bp;
buf = ereallocarray(NULL, pagesize, sizeof(*buf));
for (bp = buf; bp < buf + pagesize; ++bp)
*bp = ereallocarray(NULL, NCOLS, sizeof(**buf));
}
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static void
usage(void)
{
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eprintf("usage: %s [-pbfx] [-l num]\n", argv0);
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}
int
main(int argc, char *argv[])
{
ARGBEGIN {
case 'b':
backspace = 1;
break;
case 'f':
halfline = 1;
break;
case 'l':
pagesize = estrtonum(EARGF(usage()), 0, MIN(SIZE_MAX, LLONG_MAX));
break;
case 'p':
escape = 1;
break;
case 'x':
notabs = 1;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
allocbuf();
col();
flush();
return 0;
}