diff options
Diffstat (limited to 'shell/hush.c')
| -rw-r--r-- | shell/hush.c | 36 |
1 files changed, 21 insertions, 15 deletions
diff --git a/shell/hush.c b/shell/hush.c index 222fd9f..a84bb92 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -615,6 +615,7 @@ static int builtin_help(char **argv); static int builtin_pwd(char **argv); static int builtin_read(char **argv); static int builtin_test(char **argv); +static int builtin_true(char **argv); static int builtin_set(char **argv); static int builtin_shift(char **argv); static int builtin_source(char **argv); @@ -629,10 +630,10 @@ static int builtin_unset(char **argv); * For example, 'unset foo | whatever' will parse and run, but foo will * still be set at the end. */ struct built_in_command { - const char *cmd; /* name */ - int (*function) (char **argv); /* function ptr */ + const char *cmd; + int (*function)(char **argv); #if ENABLE_HUSH_HELP - const char *descr; /* description */ + const char *descr; #define BLTIN(cmd, func, help) { cmd, func, help } #else #define BLTIN(cmd, func, help) { cmd, func } @@ -642,24 +643,25 @@ struct built_in_command { /* For now, echo and test are unconditionally enabled. * Maybe make it configurable? */ static const struct built_in_command bltins[] = { + BLTIN("." , builtin_source, "Run commands in a file"), + BLTIN(":" , builtin_true, "No-op"), BLTIN("[" , builtin_test, "Test condition"), BLTIN("[[" , builtin_test, "Test condition"), #if ENABLE_HUSH_JOB BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"), #endif // BLTIN("break" , builtin_not_written, "Exit for, while or until loop"), - BLTIN("cd" , builtin_cd, "Change working directory"), + BLTIN("cd" , builtin_cd, "Change directory"), // BLTIN("continue", builtin_not_written, "Continue for, while or until loop"), BLTIN("echo" , builtin_echo, "Write strings to stdout"), BLTIN("eval" , builtin_eval, "Construct and run shell command"), - BLTIN("exec" , builtin_exec, "Exec command, replacing this shell with the exec'd process"), - BLTIN("exit" , builtin_exit, "Exit from shell"), + BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"), + BLTIN("exit" , builtin_exit, "Exit"), BLTIN("export", builtin_export, "Set environment variable"), #if ENABLE_HUSH_JOB BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"), - BLTIN("jobs" , builtin_jobs, "Lists the active jobs"), + BLTIN("jobs" , builtin_jobs, "List active jobs"), #endif -// TODO: remove pwd? we have it as an applet... BLTIN("pwd" , builtin_pwd, "Print current directory"), BLTIN("read" , builtin_read, "Input environment variable"), // BLTIN("return", builtin_not_written, "Return from a function"), @@ -667,14 +669,12 @@ static const struct built_in_command bltins[] = { BLTIN("shift" , builtin_shift, "Shift positional parameters"), // BLTIN("trap" , builtin_not_written, "Trap signals"), BLTIN("test" , builtin_test, "Test condition"), -// BLTIN("ulimit", builtin_not_written, "Controls resource limits"), - BLTIN("umask" , builtin_umask, "Sets file creation mask"), +// BLTIN("ulimit", builtin_not_written, "Control resource limits"), + BLTIN("umask" , builtin_umask, "Set file creation mask"), BLTIN("unset" , builtin_unset, "Unset environment variable"), - BLTIN("." , builtin_source, "Source-in and run commands in a file"), #if ENABLE_HUSH_HELP BLTIN("help" , builtin_help, "List shell built-in commands"), #endif - BLTIN(NULL, NULL, NULL) }; /* Signals are grouped, we handle them in batches */ @@ -810,6 +810,12 @@ static const char *set_cwd(void) } +/* built-in 'true' handler */ +static int builtin_true(char **argv ATTRIBUTE_UNUSED) +{ + return 0; +} + /* built-in 'test' handler */ static int builtin_test(char **argv) { @@ -1005,7 +1011,7 @@ static int builtin_help(char **argv ATTRIBUTE_UNUSED) printf("\nBuilt-in commands:\n"); printf("-------------------\n"); - for (x = bltins; x->cmd; x++) { + for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) { printf("%s\t%s\n", x->cmd, x->descr); } printf("\n\n"); @@ -1583,7 +1589,7 @@ static void pseudo_exec_argv(char **ptrs2free, char **argv) * easier to waste a few CPU cycles than it is to figure out * if this is one of those cases. */ - for (x = bltins; x->cmd; x++) { + for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) { if (strcmp(argv[0], x->cmd) == 0) { debug_printf_exec("running builtin '%s'\n", argv[0]); rcode = x->function(argv); @@ -1965,7 +1971,7 @@ static int run_pipe(struct pipe *pi) p = expand_string_to_string(argv[i]); putenv(p); } - for (x = bltins; x->cmd; x++) { + for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) { if (strcmp(argv[i], x->cmd) == 0) { if (x->function == builtin_exec && argv[i+1] == NULL) { debug_printf("magic exec\n"); |