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feat(builtin): add built-in functions

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add setenv, unset, echo command to check env
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iridiumR 2022-09-18 20:49:09 +08:00
parent 329262e47b
commit 4a018bad5d
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GPG key ID: 5574BE4450D55618
1 changed files with 47 additions and 27 deletions
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70
builtin.c
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@ -2,10 +2,12 @@
* @Author: 1ridic * @Author: 1ridic
* @Date: 2022-09-18 14:16:19 * @Date: 2022-09-18 14:16:19
* @Last Modified by: 1ridic * @Last Modified by: 1ridic
* @Last Modified time: 2022-09-18 14:52:17 * @Last Modified time: 2022-09-18 20:46:12
*/ */
#include "builtin.h"
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <strings.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h> #include <unistd.h>
@ -13,23 +15,19 @@ int dish_cd(char **args);
int dish_help(char **args); 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_echo(char **args);
int dish_unset(char **args);
char* builtin_cmd[] = { char *builtin_cmd[] = {"cd", "help", "exit", "clear", "setenv", "echo", "unset"};
"cd",
"help",
"exit",
"clear"
};
int (*builtin_func[]) (char **) = { int (*builtin_func[])(char **) = {&dish_cd, &dish_help, &dish_exit,
&dish_cd, &dish_clear, &dish_setenv, &dish_echo,
&dish_help, &dish_unset};
&dish_exit,
&dish_clear
};
int dish_cd(char **args) int getBuiltinNum() { return sizeof(builtin_cmd) / sizeof(char *); }
{
int dish_cd(char **args) {
if (args[1] == NULL) { if (args[1] == NULL) {
fprintf(stderr, "dish: expected argument to \"cd\"\n"); fprintf(stderr, "dish: expected argument to \"cd\"\n");
} else { } else {
@ -40,22 +38,44 @@ int dish_cd(char **args)
return 0; return 0;
} }
int dish_help(char **args) int dish_help(char **args) {
{
fprintf(stdout, "Yet another Shell with C.\n"); fprintf(stdout, "Yet another Shell with C.\n");
return 0; return 0;
} }
int dish_exit(char **args) int dish_exit(char **args) { exit(EXIT_SUCCESS); }
{
exit(EXIT_SUCCESS);
}
int getBuiltinNum() {
return sizeof(builtin_cmd) / sizeof(char *);
}
int dish_clear(char **args) { int dish_clear(char **args) {
fprintf(stdout, "\033[H\033[J"); fprintf(stdout, "\033[H\033[J");
return 0; return 0;
} }
int dish_setenv(char **args) {
if (args[1] == NULL || args[2] == NULL)
{
fprintf(stderr, "dish: expected 2 arguments to \"setenv\"\n");
return 1;
}
setenv(args[1], args[2], 1);
return 0;
}
int dish_echo(char **args) {
if (args[1][0] == '$') {
char *env = getenv(args[1] + sizeof(char));
if (env != NULL)
fprintf(stdout, "%s\n", env);
} else
fprintf(stdout, "%s\n", args[1]);
return 0;
}
int dish_unset(char **args) {
long i = 1;
while (args[i] != NULL) {
unsetenv(args[i]);
i++;
}
return 0;
}