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fold.c
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fold.c
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et 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/errno.h"
#include "libc/fmt/conv.h"
#include "libc/intrin/safemacros.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.internal.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;
}