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kurtis_shell.c
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kurtis_shell.c
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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#define BUFF_SIZE 64
#define PATH_MAX 1024
#define PARAM_MAX 128
int main(int argc, char * argv[])
{
char *saveptr;
char cwd[(int) PATH_MAX]; // current working directory
char user_str[(int) BUFF_SIZE]; // raw user input
char *command[(int) PARAM_MAX]; // tokenized user input
int i, len, param_count;
while (1)
{
getcwd(cwd, (int) PATH_MAX);
if (ERANGE == errno)
{
perror("getcwd() error");
/* how should this be handled? */
}
printf("\n%s%% ", cwd);
fgets(user_str, (int) BUFF_SIZE, stdin);
// need to handle buffer overflow
// strip newline char and add terminating null char
len = strlen(user_str);
if ('\n' == *(user_str+len-1))
{
*(user_str+len-1) = '\0';
}
// split user input up into parameters
param_count = tokenizeIntoArray(user_str, command, (int) PARAM_MAX, " ");
// handle internal commands and anything else is a system call
if (0 == strcmp(*(command), "cd"))
{
int success = chdir(*(command+1));
if(ENOENT == errno)
{
perror("chdir() error");
errno = 0;
}
}
// exit loop when 'exit' is input
else if (0 == strcmp(*(command), "exit"))
{
exit(0);
}
else
{
// fork and exec command
runProc(command, param_count);
}
}
return 0;
}
/* tokenizes str and stores token strings in bufArr */
/* returns size of filled bufArr (number of token strings) */
int tokenizeIntoArray(char *str, char** buf_arr, const int buf_arr_size, const char* delim)
{
int i;
char *token = NULL;
char *saveptr = NULL;
token = strtok_r(str, delim, &saveptr);
i = 0;
while ((NULL != token) && (i < buf_arr_size))
{
*(buf_arr+i) = token;
token = strtok_r(NULL, delim, &saveptr);
i++;
}
*(buf_arr+i) = NULL;
return i;
}