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stuff

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p-w-rs
2022-09-15 14:40:38 -05:00
parent 59e3d32e38
commit 742bdd74d2
1 changed files with 62 additions and 56 deletions
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118
02-TeenyTinyShell/ttsh.c
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@@ -1,9 +1,9 @@
/*************************************
*
*
* Class: CS3840 - YOUR SECTION HERE
*
*
* Name(s): YOUR NAME(S) HERE
*
*
* Lab: Teeny Tiny Shell
*
*************************************/
@@ -17,24 +17,26 @@
/* read_cmd_string()
* Reads a line of text from the user
* Parameters: dest - target location for the input
* Returns: int - 0 on success or
* Returns: int - 0 on success or
* -1 on error
*/
int read_cmd_string(char dest[INPUT_MAX])
{
// Read user input
if(fgets(dest, INPUT_MAX, stdin) == NULL) {
fprintf(stderr, "Unable to read user input\n");
return -1;
}
// Read user input
if (fgets(dest, INPUT_MAX, stdin) == NULL)
{
fprintf(stderr, "Unable to read user input\n");
return -1;
}
// Remove trailing return character
int len = strlen(dest);
if(dest[len-1] == '\n') {
dest[len - 1] = '\0';
}
// Remove trailing return character
int len = strlen(dest);
if (dest[len - 1] == '\n')
{
dest[len - 1] = '\0';
}
return 0;
return 0;
}
/* parse_commands()
@@ -46,57 +48,61 @@ int read_cmd_string(char dest[INPUT_MAX])
*/
int parse_commands(char input[INPUT_MAX], char cmd_strs[CMD_MAX][INPUT_MAX])
{
// Chop the input into command strings
int cmd_count = 0;
char* cmd_ptr = strtok(input, ";");
while(cmd_ptr) {
if(cmd_count >= CMD_MAX) {
fprintf(stderr, "Too many commands\n");
return -1;
}
strncpy(cmd_strs[cmd_count], cmd_ptr, INPUT_MAX);
cmd_count++;
cmd_ptr = strtok(NULL, ";");
}
// Chop the input into command strings
int cmd_count = 0;
char *cmd_ptr = strtok(input, ";");
while (cmd_ptr)
{
if (cmd_count >= CMD_MAX)
{
fprintf(stderr, "Too many commands\n");
return -1;
}
strncpy(cmd_strs[cmd_count], cmd_ptr, INPUT_MAX);
cmd_count++;
cmd_ptr = strtok(NULL, ";");
}
return cmd_count;
return cmd_count;
}
int main()
{
char user_input[INPUT_MAX];
char cmd_strs[CMD_MAX][INPUT_MAX];
char user_input[INPUT_MAX];
char cmd_strs[CMD_MAX][INPUT_MAX];
// TODO need to be able to get input from
// the user in a loop
// TODO need to be able to get input from
// the user in a loop
// Print the input prompt
printf("$> ");
// Print the input prompt
printf("$> ");
// Read user input
if(read_cmd_string(user_input) == -1) {
return 1;
}
// Read user input
if (read_cmd_string(user_input) == -1)
{
return 1;
}
// TODO: Figure out how to handle the 'quit' command
// TODO: Figure out how to handle the 'quit' command
// Chop the input into command strings
int cmd_count = parse_commands(user_input, cmd_strs);
if(cmd_count == -1) {
return 1;
}
// Chop the input into command strings
int cmd_count = parse_commands(user_input, cmd_strs);
if (cmd_count == -1)
{
return 1;
}
// Chop the commands into arguments and execute one at a time
for(int i = 0; i < cmd_count; i++) {
// TODO:
// 1) Chop the command into command line arguments
// need to handle up to 10 arguments
// NOTE: the command name is always the first argument
// 2) fork a process
// 3) execute the command with execvp
// Chop the commands into arguments and execute one at a time
for (int i = 0; i < cmd_count; i++)
{
}
return 0;
// TODO:
// 1) Chop the command into command line arguments
// need to handle up to 10 arguments
// NOTE: the command name is always the first argument
// 2) fork a process
// 3) execute the command with execvp
}
return 0;
}