diff --git a/main.c b/main.c index b71b64c..473ae75 100644 --- a/main.c +++ b/main.c @@ -3,8 +3,10 @@ #include #include #include +#include - +#define true 1 +#define false 0 #define LEN 512 #define PATH "/bin/" #define ERROR -1 @@ -12,11 +14,12 @@ int getHostName(char* host); int getUserName(char* name); -int runExec(char** args); +int runExec(char** args, int writeToFile); void PrintTokens (char** tokens); -char** ReadTokens(FILE* stream) ; +char** ReadTokens(FILE* stream, int* writeToFile) ; void FreeTokens(char** tokens) ; void checkIfQuit(char* word); +int getFileNameIndex(char** args); int main() @@ -25,6 +28,7 @@ int main() char* host_n = (char *)malloc(sizeof(char)); char* user_n = (char *)malloc(sizeof(char)); char** args; + int writeToFile = false; if(getHostName(host_n) == ERROR) goto quit; @@ -34,17 +38,18 @@ int main() while(1) { printf("%d %s@%s$ ",exitCode, user_n, host_n); - args = ReadTokens(stdin); + args = ReadTokens(stdin, &writeToFile); if(args != NULL) { - exitCode = runExec(args); + exitCode = runExec(args, writeToFile); FreeTokens(args); //in case of error while trying to create process - this method will free the memory already if(exitCode == ERROR) goto quit; } + writeToFile = false; } -quit: + quit: free(host_n); free(user_n); return 0; @@ -76,7 +81,7 @@ int getUserName(char* name) * @param args - an array of strings that contains all the arguments from the user * @return int - exit status of child */ - int runExec(char** args) + int runExec(char** args, int writeToFile) { int status; pid_t pid; @@ -86,8 +91,6 @@ int getUserName(char* name) strcpy(path, PATH); strcat(path, exe); - printf("try: %s \n",args[0]); - pid = fork(); if(pid < 0) @@ -97,15 +100,28 @@ int getUserName(char* name) } else if(pid == 0) // child { - if(execv(path, args) != 0) + if(writeToFile == true) { - fprintf(stderr, "%s%s%s\n", "myTerminal: ", args[0] ,": command not found"); + int i_lastArg = getFileNameIndex(args); + char* fileName = (char *)malloc(strlen(args[i_lastArg])*sizeof(char)); + strcpy(fileName, args[i_lastArg]); + args[i_lastArg - 1] = NULL; + int fd = open(fileName, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR); + dup2(fd, 1); // make stdout go to file + dup2(fd, 2); // make stderr go to file + close(fd); + + } + if(execv(path, args) != 0) + { + fprintf(stderr, "%s%s%s\n", "myTerminal: ", args[0] ,": command not found"); exit(1); //child error - chield needs to be closed manually. exit code 225; } } else //pid > 0 father waitpid(pid,&status,0); free(path); + free(exe); if(status == EXIT_1) //in my computer exit(1) returns 256 - ex demands wanted 255 return status-1; return status; @@ -118,7 +134,7 @@ int getUserName(char* name) * @param stream FILE* - in our case stdin * @return if all went well , an Array of arguements from the input line. */ - char** ReadTokens(FILE* stream) + char** ReadTokens(FILE* stream, int* writeToFile) { char** returnArr; char input[LEN]; // the var to hold the line @@ -154,16 +170,17 @@ int getUserName(char* name) while (tok != NULL) { returnArr[i] = (char *)malloc(strlen(tok)*sizeof(char)); - //returnArr[i] = tok; strcpy(returnArr[i], tok); if(wordCnt == 1) checkIfQuit(tok); + if(i == wordCnt-2) // one before the last argument. to see if to put output into file. + if(strcmp(">", returnArr[i]) == 0) + *writeToFile = true; tok = strtok(NULL, " \n"); i++; } returnArr[wordCnt] = NULL; // the last index will be NULL - so we know where the end is. - return returnArr; } @@ -175,7 +192,7 @@ int getUserName(char* name) */ void checkIfQuit(char* word) { - if(strcmp(word, "quit") == 0) + if(strcmp(word, "exit") == 0) exit(0); } @@ -211,4 +228,12 @@ int getUserName(char* name) free(tokens[i]); // free the last index tokens = NULL; // free the array free(tokens); +} + +int getFileNameIndex(char** args) +{ + int i = 0; + while(args[i] != NULL) + i++; + return i-1; } \ No newline at end of file