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/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "text.h"
#include "util.h"
#include "utf.h"
static int bflag = 0;
static int sflag = 0;
static size_t width = 80;
static void
foldline(struct line *l, const char *fname) {
size_t i, col, last, spacesect, len;
Rune r;
int runelen;
for (i = 0, last = 0, col = 0, spacesect = 0; i < l->len; i += runelen) {
if (col >= width && ((l->data[i] != '\r' && l->data[i] != '\b') || bflag)) {
if (bflag && col > width)
i -= runelen; /* never split a character */
len = ((sflag && spacesect) ? spacesect : i) - last;
if (fwrite(l->data + last, 1, len, stdout) != len)
eprintf("fwrite <stdout>:");
if (l->data[i] != '\n')
putchar('\n');
if (sflag && spacesect)
i = spacesect;
last = i;
col = 0;
spacesect = 0;
}
runelen = charntorune(&r, l->data + i, l->len - i);
if (!runelen || r == Runeerror)
eprintf("charntorune: %s: invalid utf\n", fname);
if (sflag && isblankrune(r))
spacesect = i + runelen;
if (!bflag && iscntrl(l->data[i])) {
switch(l->data[i]) {
case '\b':
col -= (col > 0);
break;
case '\r':
col = 0;
break;
case '\t':
col += (8 - (col % 8));
if (col >= width)
i--;
break;
}
} else {
col += bflag ? runelen : 1;
}
}
if (l->len - last)
fwrite(l->data + last, 1, l->len - last, stdout);
}
static void
fold(FILE *fp, const char *fname)
{
static struct line line;
static size_t size = 0;
ssize_t len;
while ((len = getline(&line.data, &size, fp)) > 0) {
line.len = len;
foldline(&line, fname);
}
if (ferror(fp))
eprintf("getline %s:", fname);
}
static void
usage(void)
{
eprintf("usage: %s [-bs] [-w num | -num] [FILE ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
FILE *fp;
int ret = 0;
ARGBEGIN {
case 'b':
bflag = 1;
break;
case 's':
sflag = 1;
break;
case 'w':
width = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
break;
ARGNUM:
if (!(width = ARGNUMF()))
eprintf("illegal width value, too small\n");
break;
default:
usage();
} ARGEND
if (!argc) {
fold(stdin, "<stdin>");
} else {
for (; *argv; argc--, argv++) {
if (!strcmp(*argv, "-")) {
*argv = "<stdin>";
fp = stdin;
} else if (!(fp = fopen(*argv, "r"))) {
weprintf("fopen %s:", *argv);
ret = 1;
continue;
}
fold(fp, *argv);
if (fp != stdin && fshut(fp, *argv))
ret = 1;
}
}
ret |= fshut(stdin, "<stdin>") | fshut(stdout, "<stdout>");
return ret;
}