Merge branch 'cat'

This commit is contained in:
Emma Tebibyte 2023-08-15 21:31:29 -06:00
commit 043b20a150
Signed by: emma
GPG Key ID: 6D661C738815E7DD
4 changed files with 222 additions and 0 deletions

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Makefile Normal file
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# Copyright (c) 2023 Emma Tebibyte
# SPDX-License-Identifier: FSFAP
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice and this
# notice are preserved. This file is offered as-is, without any warranty.
.POSIX:
PREFIX=/usr/local/bin
CFLAGS=-O3 -s -Wl,-z,noseparate-code,-z,nosectionheader -flto
build: build_dir cat false true
clean: build_dir
rm -rf build/
cat: build_dir
cc $(CFLAGS) -o build/cat src/cat.c
false: build_dir
cc $(CFLAGS) -o build/false src/false.c
true: build_dir
cc $(CFLAGS) -o build/true src/true.c
build_dir:
mkdir -p build
install: build
mkdir -p $(PREFIX)
cp -f build/* $(PREFIX)/

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src/cat.c Normal file
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/*
* Copyright (c) 2023 Emma Tebibyte
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This file is part of YAC coreutils.
*
* YAC coreutils is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* YAC coreutils is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
* details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
#include <errno.h>
#include <sysexits.h>
#include <sys/stat.h>
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
void cat(FILE *file, bool u) {
int byte = 0; /* variable for storing bytes as they are read */
int p = 0; /* index counter for bytes in buffered reading */
char buf[4096]; /* buffer for buffered reading */
if (u) {
while (byte != EOF) {
byte = fgetc(file);
putchar(byte);
}
} else {
while (byte != EOF) {
byte = fgetc(file);
if (p > sizeof(buf)) {
fputs(buf, stdout);
p = 0;
} else {
buf[p] = byte;
p += 1;
}
}
fwrite(buf, 1, p, stdout);
fflush(stdout);
}
}
int main(int argc, char *argv[]) {
bool u = false;
int opt;
int i;
extern int optind;
while ((opt = getopt(argc, argv, "u")) != -1) {
switch (opt) {
/*
* From cat(1p):
*
* -u Write bytes from the input file to the standard output
* without delay as each is read.
*/
case 'u':
u = true;
break;
default:
fprintf(stderr, "Usage: %s (-u) file...\n", argv[0]);
return EX_USAGE;
}
}
/*
* From cat(1p):
*
* file A pathname of an input file. If no file operands are
* specified, the standard input shall be used. If a file is
* '-', the cat utility shall read from the standard input at
* that point in the sequence. The cat utility shall not close
* and reopen standard input when it is referenced in this way,
* but shall accept multiple occurrences of '-' as a file
* operand.
*/
if (optind == argc) {
cat(stdin, u);
return 0;
}
FILE *file;
struct stat stats;
for (i = optind; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case '\0':
file = stdin;
break;
default:
continue;
}
} else if (stat(argv[i], &stats) == 0 && S_ISDIR(stats.st_mode)) {
fprintf(stderr, "%s: %s: Is a directory.\n", argv[0], argv[i]);
return EX_NOINPUT;
} else if ((file = fopen(argv[i], "r")) == NULL) {
switch (errno) {
case EACCES:
fprintf(stderr, "%s: %s: Permission denied.\n", argv[0], argv[i]);
return EX_NOINPUT;
case EISDIR:
fprintf(stderr, "%s: %s: Is a directory.\n", argv[0], argv[i]);
return EX_NOINPUT;
case ELOOP:
fprintf(
stderr,
"%s: %s: Is a symbolic link loop.\n",
argv[0],
argv[i]
);
return EX_UNAVAILABLE;
case EMFILE:
fprintf(stderr, "%s: Internal error.\n", argv[0]);
return EX_SOFTWARE;
case ENOENT: case ENOTDIR: case ENXIO:
fprintf(
stderr,
"%s: %s: No such file or directory.\n",
argv[0],
argv[i]
);
return EX_NOINPUT;
default:
fprintf(stderr, "%s: Unknown error.\n", argv[0]);
return EX_UNAVAILABLE;
}
}
cat(file, u);
if (file != stdin) { fclose(file); }
}
return EX_OK;
}

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src/false.c Normal file
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/*
* Copyright (c) 2023 Emma Tebibyte
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This file is part of YAC coreutils.
*
* YAC coreutils is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* YAC coreutils is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
* details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
int main() { return 1; }

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src/true.c Normal file
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/*
* Copyright (c) 2023 Emma Tebibyte
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This file is part of YAC coreutils.
*
* YAC coreutils is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* YAC coreutils is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
* details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
int main() {}