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moved file resolution code to a shared library

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This commit is contained in:
Emma Tebibyte 2023-08-28 23:03:33 -06:00
parent 3a410edddc
commit 7f5e532216
Signed by untrusted user: emma
GPG Key ID: 6D661C738815E7DD
6 changed files with 125 additions and 54 deletions
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16
Makefile
View File

@ -7,10 +7,10 @@
.POSIX:
PREFIX=/usr/local/bin
CFLAGS=-O3 -s -Wl,-z,noseparate-code,-z,nosectionheader -flto
PREFIX=/usr/local
CFLAGS=-O3 -s -Wl,-z,noseparate-code,-z,nosectionheader -flto -Lbuild -lyac
build: build_dir cat false true
build: build_dir lib cat false tail true
clean: build_dir
rm -rf build/
@ -21,12 +21,20 @@ cat: build_dir
false: build_dir
cc $(CFLAGS) -o build/false src/false.c
tail: build_dir
cc $(CFLAGS) -o build/tail src/tail.c
true: build_dir
cc $(CFLAGS) -o build/true src/true.c
lib:
cc -c -fPIC $(CFLAGS) -o build/yac.o src/yac.c
cc $(CFLAGS) -shared -o build/libyac.so build/yac.o
build_dir:
mkdir -p build
install: build
mkdir -p $(PREFIX)
cp -f build/* $(PREFIX)/
cp -f build/*.so $(PREFIX)/lib/
cp -f build/* $(PREFIX)/bin/

52
src/cat.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2023 Emma Tebibyte
* Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This file is part of YAC coreutils.
@ -25,6 +25,8 @@
#include <stdio.h>
#include <unistd.h>
#include "yac.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 */
@ -89,55 +91,13 @@ int main(int argc, char *argv[]) {
}
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;
}
}
file = rpath(argv[0], argv[i]);
if (file != NULL) {
cat(file, u);
if (file != stdin) { fclose(file); }
} else { continue; }
}
return EX_OK;

2
src/false.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2023 Emma Tebibyte
* Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This file is part of YAC coreutils.

2
src/true.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2023 Emma Tebibyte
* Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This file is part of YAC coreutils.

77
src/yac.c Normal file
View File

@ -0,0 +1,77 @@
/*
* Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
* 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 <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <sys/stat.h>
/* Resolve a file from a path */
FILE *rpath(char *argv0, char *path) {
struct stat stats;
FILE *file;
if (path[0] == '-') {
switch (path[1]) {
case '\0':
file = stdin;
break;
default:
file = NULL;
break;
}
} else if (stat(path, &stats) == 0 && S_ISDIR(stats.st_mode)) {
fprintf(stderr, "%s: %s: Is a directory.\n", argv0, path);
exit(EX_NOINPUT);
} else if ((file = fopen(path, "r")) == NULL) {
switch (errno) {
case EACCES:
fprintf(stderr, "%s: %s: Permission denied.\n", argv0, path);
exit(EX_NOINPUT);
case EISDIR:
fprintf(stderr, "%s: %s: Is a directory.\n", argv0, path);
exit(EX_NOINPUT);
case ELOOP:
fprintf(
stderr,
"%s: %s: Is a symbolic link loop.\n",
argv0,
path
);
exit(EX_UNAVAILABLE);
case EMFILE:
fprintf(stderr, "%s: Internal error.\n", argv0);
exit(EX_SOFTWARE);
case ENOENT: case ENOTDIR: case ENXIO:
fprintf(
stderr,
"%s: %s: No such path or directory.\n",
argv0,
path
);
exit(EX_NOINPUT);
default:
fprintf(stderr, "%s: Unknown error.\n", argv0);
exit(EX_UNAVAILABLE);
}
}
return file;
}

26
src/yac.h Normal file
View File

@ -0,0 +1,26 @@
/*
* Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
* 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/.
*/
#ifndef YAC_H
#define YAC_H
FILE *rpath(char *argv0, char *path);
#endif