I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and 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.
158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
/*
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* Copyright (c) 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* cat.c
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* Concatenate and print files to the standard output.
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*/
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#include <sys/stat.h>
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static bool cat_fd(int fd, const char* path)
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{
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struct stat st;
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if ( fstat(fd, &st) == 0 )
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{
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if ( S_ISDIR(st.st_mode) )
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return error(0, EISDIR, "`%s'", path), false;
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}
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const size_t BUFFER_SIZE = 16 * 1024;
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uint8_t buffer[BUFFER_SIZE];
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ssize_t buffer_used;
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while ( 0 < (buffer_used = read(fd, buffer, BUFFER_SIZE)) )
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{
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size_t so_far = 0;
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while ( so_far < (size_t) buffer_used )
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{
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ssize_t amount = write(1, buffer + so_far, buffer_used - so_far);
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if ( amount <= 0 )
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return error(0, errno, "`%s'", "<stdout>"), false;
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so_far += amount;
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}
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}
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if ( buffer_used < 0 )
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return error(0, errno, "`%s'", path), false;
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return true;
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}
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static bool cat_path(const char* path)
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{
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if ( !strcmp("-", path) )
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return cat_fd(0, "<stdin>");
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int fd = open(path, O_RDONLY);
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if ( fd < 0 )
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{
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error(0, errno, "`%s'", path);
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return false;
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}
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bool result = cat_fd(fd, path);
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close(fd);
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return result;
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}
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static bool cat_arguments(int argc, char* argv[])
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{
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if ( argc <= 1 )
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return cat_path("-");
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bool success = true;
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for ( int i = 1; i < argc; i++ )
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if ( !cat_path(argv[i]) )
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success = false;
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return success;
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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static void help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... [FILE]...\n", argv0);
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fprintf(fp, "Concatenate FILE(s), or standard input, to standard output.\n");
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fprintf(fp, "\n");
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fprintf(fp, " -u (ignored)\n");
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fprintf(fp, " --help display this help and exit\n");
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fprintf(fp, " --version output version information and exit\n");
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fprintf(fp, "\n");
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fprintf(fp, "With no FILE, or when FILE is -, read standard input.\n");
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}
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static void version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 'u': /* Ignored, POSIX compatibility. */ break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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help(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--help") )
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help(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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help(stderr, argv0);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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return cat_arguments(argc, argv) ? 0 : 1;
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}
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