85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/safemacros.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/fmt/conv.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/stdio/stdio.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/ex.h"
|
|
#include "libc/sysv/consts/exit.h"
|
|
#include "third_party/getopt/getopt.h"
|
|
|
|
int column_;
|
|
|
|
wontreturn void usage(int rc, FILE *f) {
|
|
fputs("Usage: ", f);
|
|
fputs(program_invocation_name, f);
|
|
fputs(" [-w COLS] [FILE...]\n", f);
|
|
exit(rc);
|
|
}
|
|
|
|
void getopts(int argc, char *argv[]) {
|
|
int opt;
|
|
while ((opt = getopt(argc, argv, "?hw:")) != -1) {
|
|
switch (opt) {
|
|
case 'w':
|
|
column_ = strtol(optarg, NULL, 0);
|
|
break;
|
|
case '?':
|
|
case 'h':
|
|
usage(EXIT_SUCCESS, stdout);
|
|
default:
|
|
usage(EX_USAGE, stderr);
|
|
}
|
|
}
|
|
if (column_ <= 0) {
|
|
column_ = 64;
|
|
}
|
|
}
|
|
|
|
void fold(FILE *fin, FILE *fout) {
|
|
unsigned column = 0;
|
|
for (;;) {
|
|
wint_t wc = fgetwc(fin);
|
|
if (wc != -1) {
|
|
fputwc(wc, fout);
|
|
if (wc == '\n') {
|
|
column = 0;
|
|
} else if (++column == column_) {
|
|
fputc('\n', fout);
|
|
column = 0;
|
|
}
|
|
} else {
|
|
if (feof(fin)) {
|
|
return;
|
|
} else {
|
|
fprintf(stderr, "%s: %d\n", "fgetwc", errno);
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
getopts(argc, argv);
|
|
fold(stdin, stdout);
|
|
return 0;
|
|
}
|