82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/**
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* @brief cat - Concatenate files
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*
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* Concatenates files together to standard output.
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* In a supporting terminal, you can then pipe
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* standard out to another file or other useful
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* things like that.
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2013-2018 K. Lange
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#define CHUNK_SIZE 4096
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static char * _argv_0;
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static char * _file;
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void doit(int fd) {
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while (1) {
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char buf[CHUNK_SIZE];
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memset(buf, 0, CHUNK_SIZE);
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ssize_t r = read(fd, buf, CHUNK_SIZE);
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if (!r) return;
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if (r < 0) {
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fprintf(stderr, "%s: %s: %s\n", _argv_0, _file, strerror(errno));
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return;
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}
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write(STDOUT_FILENO, buf, r);
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}
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}
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int main(int argc, char ** argv) {
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int ret = 0;
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_argv_0 = argv[0];
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if (argc == 1) {
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_file = "stdin";
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doit(0);
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}
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for (int i = 1; i < argc; ++i) {
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if (!strcmp(argv[i],"-")) {
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_file = "stdin";
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doit(0);
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continue;
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}
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_file = argv[i];
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int fd = open(argv[i], O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "%s: %s: %s\n", argv[0], argv[i], strerror(errno));
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ret = 1;
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continue;
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}
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struct stat _stat;
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fstat(fd, &_stat);
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if (S_ISDIR(_stat.st_mode)) {
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fprintf(stderr, "%s: %s: Is a directory\n", argv[0], argv[i]);
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close(fd);
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ret = 1;
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continue;
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}
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doit(fd);
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close(fd);
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}
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return ret;
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}
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