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feat(builtin): add built-in functions

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iridiumR 2022-09-20 20:25:49 +08:00
parent 781e59236d
commit 72f9204ea6
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GPG key ID: 5574BE4450D55618
1 changed files with 28 additions and 23 deletions
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41
builtin.c
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@ -16,15 +16,17 @@ int dish_help(char **args);
int dish_exit(char **args); int dish_exit(char **args);
int dish_clear(char **args); int dish_clear(char **args);
int dish_setenv(char **args); int dish_setenv(char **args);
int dish_getenv(char **args);
int dish_unsetenv(char **args);
int dish_echo(char **args); int dish_echo(char **args);
int dish_unset(char **args);
int dish_laststatus(char **args); int dish_laststatus(char **args);
char *builtin_cmd[] = {"cd", "help", "exit", "clear", "setenv", "echo", "unset","laststatus"}; char *builtin_cmd[] = {"cd", "help", "exit", "clear", "setenv",
"getenv", "unsetenv", "echo", "laststatus"};
int (*builtin_func[])(char **) = {&dish_cd, &dish_help, &dish_exit, int (*builtin_func[])(char **) = {
&dish_clear, &dish_setenv, &dish_echo, &dish_cd, &dish_help, &dish_exit, &dish_clear, &dish_setenv,
&dish_unset,&dish_laststatus}; &dish_getenv, &dish_unsetenv, &dish_echo, &dish_laststatus};
int getBuiltinNum() { return sizeof(builtin_cmd) / sizeof(char *); } int getBuiltinNum() { return sizeof(builtin_cmd) / sizeof(char *); }
@ -52,8 +54,7 @@ int dish_clear(char **args) {
} }
int dish_setenv(char **args) { int dish_setenv(char **args) {
if (args[1] == NULL || args[2] == NULL) if (args[1] == NULL || args[2] == NULL) {
{
fprintf(stderr, "dish: expected 2 arguments to \"setenv\"\n"); fprintf(stderr, "dish: expected 2 arguments to \"setenv\"\n");
return 1; return 1;
} }
@ -62,6 +63,20 @@ setenv(args[1], args[2], 1);
return 0; return 0;
} }
int dish_getenv(char **args) {
fprintf(stdout, "%s\n", getenv(args[1]));
return 0;
}
int dish_unsetenv(char **args) {
long i = 1;
while (args[i] != NULL) {
unsetenv(args[i]);
i++;
}
return 0;
}
int dish_echo(char **args) { int dish_echo(char **args) {
if (args[1][0] == '$') { if (args[1][0] == '$') {
char *env = getenv(args[1] + sizeof(char)); char *env = getenv(args[1] + sizeof(char));
@ -72,17 +87,7 @@ int dish_echo(char **args) {
return 0; return 0;
} }
int dish_unset(char **args) { int dish_laststatus(char **args) {
long i = 1;
while (args[i] != NULL) {
unsetenv(args[i]);
i++;
}
return 0;
}
int dish_laststatus(char **args)
{
extern int status; extern int status;
fprintf(stdout, "%d\n", status); fprintf(stdout, "%d\n", status);
return 0; return 0;