86 lines
3.2 KiB
C
86 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.internal.h"
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#include "libc/conv/conv.h"
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#include "libc/errno.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/ex.h"
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#include "libc/sysv/consts/exit.h"
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#include "third_party/getopt/getopt.h"
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int column_;
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noreturn void usage(int rc, FILE *f) {
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fputs("Usage: ", f);
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fputs(program_invocation_name, f);
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fputs(" [-w COLS] [FILE...]\n", f);
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exit(rc);
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}
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void getopts(int argc, char *argv[]) {
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int opt;
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while ((opt = getopt(argc, argv, "?hw:")) != -1) {
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switch (opt) {
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case 'w':
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column_ = strtol(optarg, NULL, 0);
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break;
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case '?':
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case 'h':
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usage(EXIT_SUCCESS, stdout);
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default:
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usage(EX_USAGE, stderr);
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}
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}
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if (column_ <= 0) {
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column_ = 64;
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}
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}
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void fold(FILE *fin, FILE *fout) {
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unsigned column = 0;
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for (;;) {
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wint_t wc = fgetwc(fin);
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if (wc != -1) {
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fputwc(wc, fout);
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if (wc == '\n') {
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column = 0;
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} else if (++column == column_) {
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fputc('\n', fout);
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column = 0;
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}
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} else {
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if (feof(fin)) {
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return;
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} else {
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fprintf(stderr, "%s: %d\n", "fgetwc", errno);
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exit(1);
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}
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}
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}
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}
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int main(int argc, char *argv[]) {
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getopts(argc, argv);
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fold(stdin, stdout);
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return 0;
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}
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