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-rw-r--r--shell/lash.c86
1 files changed, 45 insertions, 41 deletions
diff --git a/shell/lash.c b/shell/lash.c
index 7203ba3..60d67e9 100644
--- a/shell/lash.c
+++ b/shell/lash.c
@@ -89,19 +89,21 @@ struct builtInCommand {
int (*function) (struct job *, struct jobSet * jobList); /* function ptr */
};
-/* Some function prototypes */
-static int shell_cd(struct job *cmd, struct jobSet *junk);
-static int shell_env(struct job *dummy, struct jobSet *junk);
-static int shell_exit(struct job *cmd, struct jobSet *junk);
-static int shell_fg_bg(struct job *cmd, struct jobSet *jobList);
-static int shell_help(struct job *cmd, struct jobSet *junk);
-static int shell_jobs(struct job *dummy, struct jobSet *jobList);
-static int shell_pwd(struct job *dummy, struct jobSet *junk);
-static int shell_export(struct job *cmd, struct jobSet *junk);
-static int shell_source(struct job *cmd, struct jobSet *jobList);
-static int shell_unset(struct job *cmd, struct jobSet *junk);
-static int shell_read(struct job *cmd, struct jobSet *junk);
-
+/* function prototypes for builtins */
+static int builtin_cd(struct job *cmd, struct jobSet *junk);
+static int builtin_env(struct job *dummy, struct jobSet *junk);
+static int builtin_exit(struct job *cmd, struct jobSet *junk);
+static int builtin_fg_bg(struct job *cmd, struct jobSet *jobList);
+static int builtin_help(struct job *cmd, struct jobSet *junk);
+static int builtin_jobs(struct job *dummy, struct jobSet *jobList);
+static int builtin_pwd(struct job *dummy, struct jobSet *junk);
+static int builtin_export(struct job *cmd, struct jobSet *junk);
+static int builtin_source(struct job *cmd, struct jobSet *jobList);
+static int builtin_unset(struct job *cmd, struct jobSet *junk);
+static int builtin_read(struct job *cmd, struct jobSet *junk);
+
+
+/* function prototypes for shell stuff */
static void checkJobs(struct jobSet *jobList);
static int getCommand(FILE * source, char *command);
static int parseCommand(char **commandPtr, struct job *job, int *isBg);
@@ -112,23 +114,23 @@ static int busy_loop(FILE * input);
/* Table of built-in functions */
static struct builtInCommand bltins[] = {
- {"bg", "Resume a job in the background", "bg [%%job]", shell_fg_bg},
- {"cd", "Change working directory", "cd [dir]", shell_cd},
- {"exit", "Exit from shell()", "exit", shell_exit},
- {"fg", "Bring job into the foreground", "fg [%%job]", shell_fg_bg},
- {"jobs", "Lists the active jobs", "jobs", shell_jobs},
- {"export", "Set environment variable", "export [VAR=value]", shell_export},
- {"unset", "Unset environment variable", "unset VAR", shell_unset},
- {"read", "Input environment variable", "read [VAR]", shell_read},
+ {"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg},
+ {"cd", "Change working directory", "cd [dir]", builtin_cd},
+ {"exit", "Exit from shell()", "exit", builtin_exit},
+ {"fg", "Bring job into the foreground", "fg [%%job]", builtin_fg_bg},
+ {"jobs", "Lists the active jobs", "jobs", builtin_jobs},
+ {"export", "Set environment variable", "export [VAR=value]", builtin_export},
+ {"unset", "Unset environment variable", "unset VAR", builtin_unset},
+ {"read", "Input environment variable", "read [VAR]", builtin_read},
{NULL, NULL, NULL, NULL}
};
/* Table of built-in functions */
static struct builtInCommand bltins_forking[] = {
- {"env", "Print all environment variables", "env", shell_env},
- {"pwd", "Print current directory", "pwd", shell_pwd},
- {".", "Source-in and run commands in a file", ". filename", shell_source},
- {"help", "List shell built-in commands", "help", shell_help},
+ {"env", "Print all environment variables", "env", builtin_env},
+ {"pwd", "Print current directory", "pwd", builtin_pwd},
+ {".", "Source-in and run commands in a file", ". filename", builtin_source},
+ {"help", "List shell built-in commands", "help", builtin_help},
{NULL, NULL, NULL, NULL}
};
@@ -157,7 +159,7 @@ void win_changed(int sig)
/* built-in 'cd <path>' handler */
-static int shell_cd(struct job *cmd, struct jobSet *junk)
+static int builtin_cd(struct job *cmd, struct jobSet *junk)
{
char *newdir;
@@ -175,7 +177,7 @@ static int shell_cd(struct job *cmd, struct jobSet *junk)
}
/* built-in 'env' handler */
-static int shell_env(struct job *dummy, struct jobSet *junk)
+static int builtin_env(struct job *dummy, struct jobSet *junk)
{
char **e;
@@ -186,7 +188,7 @@ static int shell_env(struct job *dummy, struct jobSet *junk)
}
/* built-in 'exit' handler */
-static int shell_exit(struct job *cmd, struct jobSet *junk)
+static int builtin_exit(struct job *cmd, struct jobSet *junk)
{
if (!cmd->progs[0].argv[1] == 1)
exit TRUE;
@@ -195,7 +197,7 @@ static int shell_exit(struct job *cmd, struct jobSet *junk)
}
/* built-in 'fg' and 'bg' handler */
-static int shell_fg_bg(struct job *cmd, struct jobSet *jobList)
+static int builtin_fg_bg(struct job *cmd, struct jobSet *jobList)
{
int i, jobNum;
struct job *job=NULL;
@@ -246,7 +248,7 @@ static int shell_fg_bg(struct job *cmd, struct jobSet *jobList)
}
/* built-in 'help' handler */
-static int shell_help(struct job *cmd, struct jobSet *junk)
+static int builtin_help(struct job *cmd, struct jobSet *junk)
{
struct builtInCommand *x;
@@ -263,7 +265,7 @@ static int shell_help(struct job *cmd, struct jobSet *junk)
}
/* built-in 'jobs' handler */
-static int shell_jobs(struct job *dummy, struct jobSet *jobList)
+static int builtin_jobs(struct job *dummy, struct jobSet *jobList)
{
struct job *job;
char *statusString;
@@ -281,7 +283,7 @@ static int shell_jobs(struct job *dummy, struct jobSet *jobList)
/* built-in 'pwd' handler */
-static int shell_pwd(struct job *dummy, struct jobSet *junk)
+static int builtin_pwd(struct job *dummy, struct jobSet *junk)
{
getcwd(cwd, sizeof(cwd));
fprintf(stdout, "%s\n", cwd);
@@ -289,12 +291,12 @@ static int shell_pwd(struct job *dummy, struct jobSet *junk)
}
/* built-in 'export VAR=value' handler */
-static int shell_export(struct job *cmd, struct jobSet *junk)
+static int builtin_export(struct job *cmd, struct jobSet *junk)
{
int res;
if (!cmd->progs[0].argv[1] == 1) {
- return (shell_env(cmd, junk));
+ return (builtin_env(cmd, junk));
}
res = putenv(cmd->progs[0].argv[1]);
if (res)
@@ -303,7 +305,7 @@ static int shell_export(struct job *cmd, struct jobSet *junk)
}
/* built-in 'read VAR' handler */
-static int shell_read(struct job *cmd, struct jobSet *junk)
+static int builtin_read(struct job *cmd, struct jobSet *junk)
{
int res = 0, len, newlen;
char *s;
@@ -337,7 +339,7 @@ static int shell_read(struct job *cmd, struct jobSet *junk)
}
/* Built-in '.' handler (read-in and execute commands from file) */
-static int shell_source(struct job *cmd, struct jobSet *junk)
+static int builtin_source(struct job *cmd, struct jobSet *junk)
{
FILE *input;
int status;
@@ -358,7 +360,7 @@ static int shell_source(struct job *cmd, struct jobSet *junk)
}
/* built-in 'unset VAR' handler */
-static int shell_unset(struct job *cmd, struct jobSet *junk)
+static int builtin_unset(struct job *cmd, struct jobSet *junk)
{
if (!cmd->progs[0].argv[1] == 1) {
fprintf(stdout, "unset: parameter required.\n");
@@ -803,7 +805,7 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
nextout = 1;
}
- /* Match any built-ins here */
+ /* Check if the command matches any non-forking builtins */
for (x = bltins; x->cmd; x++) {
if (!strcmp(newJob.progs[i].argv[0], x->cmd)) {
return (x->function(&newJob, jobList));
@@ -826,14 +828,16 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
/* explicit redirections override pipes */
setupRedirections(newJob.progs + i);
- /* Match any built-ins here */
+ /* Check if the command matches any of the other builtins */
for (x = bltins_forking; x->cmd; x++) {
if (!strcmp(newJob.progs[i].argv[0], x->cmd)) {
exit (x->function(&newJob, jobList));
}
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
- /* Handle busybox internals here */
+ /* Check if the command matches any busybox internal commands here */
+ /* TODO: Add matching when paths are appended (i.e. 'cat' currently
+ * works, but '/bin/cat' doesn't ) */
while (a->name != 0) {
if (strcmp(newJob.progs[i].argv[0], a->name) == 0) {
int argc;
@@ -1050,7 +1054,7 @@ int shell_main(int argc, char **argv)
#endif
//if (argv[0] && argv[0][0] == '-') {
- // shell_source("/etc/profile");
+ // builtin_source("/etc/profile");
//}
if (argc < 2) {
generated by cgit v1.1 at 2024-11-07 21:43:14 +0000