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206 lines
3.5 KiB
206 lines
3.5 KiB
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include<fcntl.h>
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static int num = 0;
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static char storage[MAXLINE][MAXLINE];
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void history(char *cmdline)
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{
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strcpy(storage[num], cmdline);
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num++;
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}
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void print_history(char *argv)
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{
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int i = 0;
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if(argv == NULL)
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{
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for(; i<num; i++)
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{
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fputs(storage[i], stdout);
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}
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return;
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}
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i = num - atoi(argv);
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if(i < 0)
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{
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i = 0;
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}
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for(; i<num; i++)
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{
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fputs(storage[i], stdout);
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}
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}
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void shell_pip(char **prog1, char **prog2)
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{
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int des_p[2];
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if(pipe(des_p) == -1)
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{
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perror("Pipe failed");
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exit(1);
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}
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if(fork() == 0)
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{
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close(1);
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dup(des_p[1]);
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close(des_p[0]);
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close(des_p[1]);
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execvp(prog1[0], prog1);
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perror("execvp of prog1 failed");
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exit(1);
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}
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if(fork() == 0)
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{
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close(0);
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dup(des_p[0]);
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close(des_p[1]);
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close(des_p[0]);
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execvp(prog2[0], prog2);
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perror("execvp of prog2 failed");
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exit(1);
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}
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close(des_p[0]);
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close(des_p[1]);
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wait(0);
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wait(0);
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}
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int Is_pipe(char **argv)
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{
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int i = 0;
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int Ispipe = 0;
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char *cmd_0[MAXLINE];
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char *cmd_1[MAXLINE];
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while (argv[i]!=NULL)
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{
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if (argv[i][0] == '|')
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{
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Ispipe = 1;
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}
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i++;
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}
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if(Ispipe == 0)
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{
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return 0;
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}
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i = 0;
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while (argv[i][0] != '|')
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{
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cmd_0[i] = argv[i];
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i++;
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}
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cmd_0[i] = NULL;
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i++;
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int j = 0;
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while (argv[i]!=NULL)
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{
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cmd_1[j] = argv[i];
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i++;
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j++;
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}
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cmd_1[j] = NULL;
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shell_pip(cmd_0, cmd_1);
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return 1;
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}
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void shell_direct(char **prog1, char **prog2, char Isopen)
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{
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int fd;
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if(Isopen == '>')
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{
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if(fork() == 0)
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{
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if( (fd=open(prog2[0],O_RDWR | O_CREAT | O_NOCTTY | O_NDELAY))<0 )
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{
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perror("open");
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exit(0);
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}
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close(1);
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dup(fd);
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close(fd);
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execvp(prog1[0], prog1);
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remove(prog2[0]);
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exit(0);
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}
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wait(0);
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if(fork() == 0)
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{
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if( (fd=open(prog1[0],O_RDWR | O_NOCTTY | O_NDELAY))<0 )
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{
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exit(0);
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}
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close(0);
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dup(fd);
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close(fd);
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execvp(prog2[0], prog2);
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exit(0);
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}
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wait(0);
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}
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if(Isopen == '<')
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{
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if(fork() == 0)
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{
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if( (fd=open(prog2[0],O_RDWR | O_NOCTTY | O_NDELAY))<0 )
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{
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perror("open");
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exit(0);
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}
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close(0);
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dup(fd);
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close(fd);
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execvp(prog1[0], prog1);
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exit(0);
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}
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wait(0);
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}
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return;
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}
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int Is_redirect(char **argv)
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{
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int i = 0;
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char Isopen = '0';
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char *cmd_0[MAXLINE];
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char *cmd_1[MAXLINE];
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while (argv[i]!=NULL)
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{
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if (argv[i][0] == '>')
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{
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Isopen = '>';
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}
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if (argv[i][0] == '<')
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{
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Isopen = '<';
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}
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i++;
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}
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if(Isopen == '0')
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{
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return 0;
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}
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i = 0;
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while (argv[i][0] != '>' && argv[i][0] != '<')
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{
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cmd_0[i] = argv[i];
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i++;
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}
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cmd_0[i] = NULL;
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i++;
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int j = 0;
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while (argv[i]!=NULL)
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{
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cmd_1[j] = argv[i];
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i++;
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j++;
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}
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cmd_1[j] = NULL;
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shell_direct(cmd_0, cmd_1, Isopen);
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return 1;
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}
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