101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* microshell.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: astein <astein@student.42lisboa.com> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2021/12/15 12:15:17 by shackbei #+# #+# */
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/* Updated: 2023/12/06 23:29:19 by astein ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include <unistd.h>
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#include <sys/wait.h>
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#include <string.h>
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#include <stdlib.h>
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/*not needed in exam, but necessary if you want to use this tester:
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https://github.com/Glagan/42-exam-rank-04/blob/master/microshell/test.sh*/
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// #ifdef TEST_SH
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// # define TEST 1
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// #else
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// # define TEST 0
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// #endif
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void ft_putstr_fd2(char *str, char *arg)
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{
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while (*str)
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write(2, str++, 1);
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if (arg)
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while(*arg)
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write(2, arg++, 1);
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write(2, "\n", 1);
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}
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void ft_execute(char *argv[], int i, int tmp_fd, char *env[])
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{
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argv[i] = NULL;
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dup2(tmp_fd, STDIN_FILENO);
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close(tmp_fd);
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execve(argv[0], argv, env);
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ft_putstr_fd2("error: cannot execute ", argv[0]);
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exit(1);
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}
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int main(int argc, char *argv[], char *env[])
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{
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int i;
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int fd[2];
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int tmp_fd;
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(void)argc;
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i = 0;
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tmp_fd = dup(STDIN_FILENO);
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while (argv[i] && argv[i + 1])
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{
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argv = &argv[i + 1];
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i = 0;
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while (argv[i] && strcmp(argv[i], ";") && strcmp(argv[i], "|"))
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i++;
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if (strcmp(argv[0], "cd") == 0)
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{
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if (i != 2)
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ft_putstr_fd2("error: cd: bad arguments", NULL);
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else if (chdir(argv[1]) != 0)
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ft_putstr_fd2("error: cd: cannot change directory to ", argv[1] );
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}
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else if (i != 0 && (argv[i] == NULL || strcmp(argv[i], ";") == 0))
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{
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if ( fork() == 0)
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ft_execute(argv, i, tmp_fd, env);
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else
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{
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close(tmp_fd);
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while(waitpid(-1, NULL, WUNTRACED) != -1)
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;
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tmp_fd = dup(STDIN_FILENO);
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}
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}
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else if(i != 0 && strcmp(argv[i], "|") == 0)
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{
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pipe(fd);
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if ( fork() == 0)
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{
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dup2(fd[1], STDOUT_FILENO);
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close(fd[0]);
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close(fd[1]);
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ft_execute(argv, i, tmp_fd, env);
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}
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else
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{
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close(fd[1]);
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close(tmp_fd);
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tmp_fd = fd[0];
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}
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}
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}
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close(tmp_fd);
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return (0);
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}
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