cydy80229 / bonus-hw

Bonus-hw

compilier: gcc -Wall -o bonus bonus.c bonus.h

Execution:./bonus

Student: Frank Wu

Assignment: Bonus Homework

#include <stdio.h> #include <sys/types.h> #include "bonus.h"

necessary headers implemented which include the bonus header

void parse(char *line, char **argv) { while (line != '\0') { / if not the end of line ....... */ while (*line == ' ' || *line == '\t' || *line == '\n') line++ = '\0'; / replace white spaces with 0 */ argv++ = line; / save the argument position */ while (*line != '\0' && *line != ' ' && *line != '\t' && line != '\n') line++; / skip the argument until ... */ } argv = '\0'; / mark the end of argument list */ }

Referecne http://www.csl.mtu.edu/cs4411.ck/www/NOTES/process/fork/exec.html

Read the input line and parase into tokens

Start from replace space into zero, till hittig a non-white space. address were saved to argv[]

void execute(char **argv) { pid_t pid; int status;

 if ((pid = fork()) < 0) {   
      printf("*** ERROR: forking child process failed\n");
      exit(1);
 }
 else if (pid == 0) {         
      if (execvp(*argv, argv) < 0) {     
           printf("\n");
           exit(1);
      }
 }
 else {                                
      while (wait(&status) != pid)       
           ;
 }

}

Referecne http://www.csl.mtu.edu/cs4411.ck/www/NOTES/process/fork/exec.html

Recive command line agument list,

Initially, being a file name followed by augments

forks child process. Excecute command with execvp

#define Buff_Len 1024 void main(void) { char line[Buff_Len];
char *argv[100]; char path = "/bin/"; char progpath[20];

 int i,n;              
 int arr[100]={0,1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,983};
 while (1) {                   
      printf("some fuctions include\n");
      printf("quit, hello, FIB ,fibonacci\n");
      printf("ls, help, cd, \n");
      printf("uab_sh >> ");   

introduction about function and excecute uab_sh >

      gets(line);              
      printf("\n");
      parse(line, argv);

The above part are from the Referecne

http://www.csl.mtu.edu/cs4411.ck/www/NOTES/process/fork/exec.html

and following are commands

      if (strcmp(argv[0], "quit") == 0)  //Exit from the OS
          { exit(0);}
      else if (strcmp(argv[0], "hello") == 0)
          {printf("Hello_World\n");
          execute(argv);
          } 
      else if (strcmp(argv[0], "FIB") == 0)
          {printf("The first 10 values is: ");
          for (i=0;i<10;i++){printf("%d, ",arr[i]);}
          printf("\n");
          execute(argv); 
          }
      else if (strcmp(argv[0], "fibonacci") == 0 )
          {printf("Key in the amount of numbers to display :\n");
          scanf("%d",&n);
          printf("The first %d values is: ",n);
          for (i=0;i<n;i++){printf("%d ,",arr[i]);} 
          execute(argv);}
      else if (strcmp(argv[0], "ls") == 0)
          {
            execvp(argv[1],argv[0]);
            execute(argv);
          }
      else if (strcmp(argv[0], "help") == 0)
          {execute(argv);}
          
      else if (strcmp(argv[0], "cd") == 0)
          {path = ".";}
      




 }

}

Put functions which include cd, help,ls, quit and fibonacci.