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Commit d7491b9b authored by hk835's avatar hk835
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3-ShellPart1/dsh_cli.c 0 → 100644
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dshlib.h"
/*
* Implement your main function by building a loop that prompts the
* user for input. Use the SH_PROMPT constant from dshlib.h and then
* use fgets to accept user input. Since we want fgets to also handle
* end of file so we can run this headless for testing we need to check
* the return code of fgets. I have provided an example below of how
* to do this assuming you are storing user input inside of the cmd_buff
* variable.
*
* while(1){
* printf("%s", SH_PROMPT);
* if (fgets(cmd_buff, ARG_MAX, stdin) == NULL){
* printf("\n");
* break;
* }
* //remove the trailing \n from cmd_buff
* cmd_buff[strcspn(cmd_buff,"\n")] = '\0';
*
* //IMPLEMENT THE REST OF THE REQUIREMENTS
* }
*
* Also, use the constants in the dshlib.h in this code.
* SH_CMD_MAX maximum buffer size for user input
* EXIT_CMD constant that terminates the dsh program
* SH_PROMPT the shell prompt
* OK the command was parsed properly
* WARN_NO_CMDS the user command was empty
* ERR_TOO_MANY_COMMANDS too many pipes used
*
* Expected output:
*
* CMD_OK_HEADER if the command parses properly. You will
* follow this by the command details
*
* CMD_WARN_NO_CMD if the user entered a blank command
* CMD_ERR_PIPE_LIMIT if the user entered too many commands using
* the pipe feature, e.g., cmd1 | cmd2 | ... |
*
* See the provided test cases for output expectations.
*/
// ASCII art for the dragon command (extra credit)
static const char* DRAGON_ASCII = "\
@%%%% \n\
%%%%%% \n\
%%%%%% \n\
% %%%%%%% @ \n\
%%%%%%%%%% %%%%%%% \n\
%%%%%%% %%%%@ %%%%%%%%%%%%@ %%%%%% @%%%% \n\
%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%% %%%%%%%%%%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%% %%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%@ @%%%%%%%%%%%%%%%%%% %% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%@%%%%%%@ \n\
%%%%%%%%@ %%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%% %% \n\
%%%%%%%%%%%%% %%@%%%%%%%%%%%% %%%%%%%%%%% %%%%%%%%%%%% @% \n\
%%%%%%%%%% %%% %%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%%% % %%%%%%%%%%%%% %%%%%%%%%%%%@%%%%%%%%%%% \n\
%%%%%%%%%@ % %%%%%%%%%%%%% @%%%%%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%%@ %%@%%%%%%%%%%%% @%%%%%%%%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%@ %%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%%%% %%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% \n\
%%%%%%%%%@ @%%%%%%%%%%%%%% %%%%%%%%%%%%@ %%%% %%%%%%%%%%%%%%%%% %%%%%%%%\n\
%%%%%%%%%% %%%%%%%%%%%%%%%%% %%%%%%%%%%%%% %%%%%%%%%%%%%%%%%% %%%%%%%%%\n\
%%%%%%%%%@%%@ %%%%%%%%%%%%%%%%@ %%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%% %%\n\
%%%%%%%%%% % %%%%%%%%%%%%%%@ %%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%% %%\n\
%%%%%%%%%%%% @ %%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% \n\
%%%%%%%%%%%%% %% % %@ %%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% \n\
%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%% @%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% \n\
@%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%% %%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%% @%%%%%%%%% \n\
%%%%%%%%%%%%%%%%%%%% @%@% @%%%%%%%%%%%%%%%%%% %%% \n\
%%%%%%%%%%%%%%% %%%%%%%%%% %%%%%%%%%%%%%%% % \n\
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%% \n\
%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% %%% %%%%%%%%%% %%%@ \n\
%%%%%%%%%%%%%%%%%%% %%%%%% %% %%%%%%%%%%%%%@ \n\
%%%%%%%@ \n";
// Helper function to print command list
static void print_command_list(command_list_t *clist) {
printf(CMD_OK_HEADER, clist->num);
for (int i = 0; i < clist->num; i++) {
printf("<%d> %s", i + 1, clist->commands[i].exe);
if (strlen(clist->commands[i].args) > 0) {
printf(" [%s]", clist->commands[i].args);
}
printf("\n");
}
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
// Allocate memory for storing user input commands
char *cmd_buff = malloc(SH_CMD_MAX * sizeof(char));
command_list_t clist; // Structure to hold parsed commands
// Check if memory allocation was successful
if (!cmd_buff) {
fprintf(stderr, "Error: Unable to allocate memory for command buffer\n");
return EXIT_FAILURE;
}
while (1) {
printf("%s", SH_PROMPT); // Display shell prompt
// Read input from the user
if (fgets(cmd_buff, ARG_MAX, stdin) == NULL) {
printf("\n"); // Handle EOF or input error gracefully
break;
}
// Remove trailing newline character from input
cmd_buff[strcspn(cmd_buff, "\n")] = '\0';
// Check if user wants to exit the shell
if (strcmp(cmd_buff, EXIT_CMD) == 0) {
free(cmd_buff); // Free allocated memory before exiting
return EXIT_SUCCESS;
}
// Easter egg: Display ASCII art if the user types "dragon"
if (strcmp(cmd_buff, "dragon") == 0) {
printf("%s", DRAGON_ASCII);
continue; // Skip further command processing
}
// Parse the input and build a command list
int rc = build_cmd_list(cmd_buff, &clist);
// Process the parsed command based on the return status
switch (rc) {
case OK:
print_command_list(&clist); // Print parsed commands
break;
case WARN_NO_CMDS:
printf(CMD_WARN_NO_CMD); // Warning if no valid commands were found
break;
case ERR_TOO_MANY_COMMANDS:
printf(CMD_ERR_PIPE_LIMIT, CMD_MAX); // Error if too many commands are entered
break;
default:
fprintf(stderr, "Error: Command processing failed\n"); // Handle unknown errors
break;
}
}
free(cmd_buff); // Ensure memory is freed before program termination
return EXIT_FAILURE;
}
free(cmd_buff);
return EXIT_SUCCESS;
}
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