/*
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* Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.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/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#define WRITE_STRING(fd, string) if (write(fd, string, sizeof(string)-1)) {}
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int main(int argc, char *argv[])
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{
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int i, pos = 0;
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char *args[argc];
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char *stdin_path = NULL, *stdout_path = NULL, *stderr_path = NULL;
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int stderr_fd = 0;
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if (argc <= 1) {
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fprintf(stderr, "%s: Takes at least one agrument!\n", argv[0]);
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return 1;
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}
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '>') {
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if (argv[i][1]) {
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stdout_path = argv[i]+1;
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} else {
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if (++i >= argc) {
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fprintf(stderr,
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"%s: Missing filename after >\n",
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argv[0]);
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return 1;
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}
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stdout_path = argv[i];
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}
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continue;
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}
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if (argv[i][0] == '<') {
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if (argv[i][1]) {
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stdin_path = argv[i]+1;
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} else {
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if (++i >= argc) {
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fprintf(stderr,
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"%s: Missing filename after <\n",
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argv[0]);
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return 1;
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}
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stdin_path = argv[i];
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}
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continue;
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}
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if (argv[i][0] == '2' && argv[i][1] == '>') {
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if (argv[i][2]) {
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stderr_path = argv[i]+2;
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} else {
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if (++i >= argc) {
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fprintf(stderr,
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"%s: Missing filename after 2>\n",
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argv[0]);
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return 1;
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}
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stderr_path = argv[i];
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}
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continue;
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}
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args[pos++] = argv[i];
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}
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args[pos] = NULL;
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if (stdin_path) {
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if (close(0)) {
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fprintf(stderr, "%s: Failed to close stdin: %s\n",
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argv[0], strerror(errno));
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return 1;
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}
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if (open(stdin_path, O_RDONLY) < 0) {
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fprintf(stderr,
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"%s: Failed to open '%s' for reading: %s\n",
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argv[0], stdin_path, strerror(errno));
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return 1;
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}
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}
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if (stdout_path) {
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if (close(1)) {
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fprintf(stderr, "%s: Failed to close stdout: %s\n",
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argv[0], strerror(errno));
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return 1;
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}
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if (open(stdout_path, O_CREAT|O_WRONLY|O_TRUNC, 0777) < 0) {
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fprintf(stderr,
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"%s: Failed to open '%s' for writing: %s\n",
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argv[0], stdin_path, strerror(errno));
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return 1;
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}
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}
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if (stderr_path) {
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int fd = open(stderr_path, O_CREAT|O_WRONLY|O_TRUNC, 0777);
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int stderr_fd = dup(2);
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if (stderr_fd < 0) {
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fprintf(stderr, "%s: Failed to dup() stderr: %s\n",
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argv[0], strerror(errno));
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return 1;
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}
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if (fd < 0) {
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fprintf(stderr,
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"%s: Failed to open '%s' for writing: %s\n",
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argv[0], stdin_path, strerror(errno));
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return 1;
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}
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if (dup2(fd, 2) < 0) {
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fprintf(stderr, "%s: Failed to dup2 stderr: %s\n",
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argv[0], strerror(errno));
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WRITE_STRING(stderr_fd, "Failed to dup2 stderr\n");
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return 1;
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}
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}
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execvp(argv[1], args);
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/* Fall back to shell if command wasn't found */
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FILE *sin = popen("/bin/sh", "w");
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if (!sin) {
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if (stderr_fd) {
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WRITE_STRING(stderr_fd, "Failed to popen /bin/sh\n");
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} else {
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fprintf(stderr, "%s: Failed to popen /bin/sh: %s\n",
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argv[0], strerror(errno));
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}
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return 1;
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}
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//TODO: Should we escape args?
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for (i = 0; args[i]; i++)
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fprintf(sin, "%s ", args[i]);
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return !!pclose(sin);
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}
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