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streams are broken but manual input is correct for test4

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shockrah 2019-09-21 22:02:56 -07:00
parent c02a7905b2
commit 39bfd0e7ff
2 changed files with 31 additions and 0 deletions
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2
334/Makefile
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@ -2,6 +2,7 @@
object=homework/msh/msh.c
cc=gcc
output=msh
tmps=*txt
default:
$(cc) $(object) -o $(output)
@ -12,3 +13,4 @@ run:
clean:
rm -f $(output)
rm -f $(tmps)

29
334/homework/msh/msh.c
View File

@ -15,16 +15,23 @@
#define RESP_DATE 2
#define RESP_ECHO 3
#define RESP_SHELL 4
#define RESP_CD_FAIL -1
#define RESP_CD_SUCCESS 6
// Sub statuses that are generally nice to have
#define CD_NOP 0x1
void echo(const char*);
void remove_newline(char*);
void exit_branch(const char*);
int builtin_response(char*);
int cd_handler(char**, const int);
int main(int argc, char** argv) {
FILE* file = NULL;
if(argc == 2) {
file = fopen(argv[1], "r");
if(!file) { return 1; }
}
char buffer[MAX_BUF];
while(1) {
@ -35,6 +42,7 @@ int main(int argc, char** argv) {
}
else {
fgets(buffer, MAX_BUF, file);
printf("buffer: %s\n", buffer);
}
// Deal with EOF input
@ -51,6 +59,8 @@ int main(int argc, char** argv) {
echo(buffer);
case RESP_SHELL: // shell command handler was used
continue;
case RESP_CD_FAIL:
printf("msh: cd: No such file or directory\n");
}
memset(buffer, 0x00, MAX_BUF); // reset buffer after each usage
}
@ -92,6 +102,9 @@ int builtin_response(char* buffer) {
return RESP_DATE;
}
// Populate tokens
char *tokens[64];
int idx = 0;
for(char* cur = strtok(buffer, STRING_DELIMITER); cur != NULL; cur=strtok(NULL, STRING_DELIMITER)) {
@ -102,6 +115,12 @@ int builtin_response(char* buffer) {
idx++;
}
// Handling director changes
int cd_result = cd_handler(tokens, idx);
if(cd_result != CD_NOP) {
return cd_result;
}
// Execute child process
pid_t child = fork();
if(child != 0) {
@ -120,3 +139,13 @@ int builtin_response(char* buffer) {
}
int cd_handler(char** tokens, const int t_count) {
if(!strcmp(tokens[0], "cd")) {
if(t_count < 2) {
int ret = chdir(getenv("HOME"));
return ret;
}
return chdir(tokens[1]);
}
return CD_NOP;
}