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builtin.c
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builtin.c
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#include "builtin.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct Builtin builtins[] = {
{ "exit", bltn_exit },
{ "cd", bltn_cd },
{ "get", bltn_get },
{ "set", bltn_set },
// End of builtins
{ '\0', NULL }
};
void bltn_exit(char *const args[])
{
int code = args[1] ? atoi(args[1]) : 0;
exit(code);
}
void bltn_cd(char *const args[])
{
char *dir = args[1] ?: getenv("HOME");
if (dir) {
chdir(dir);
}
}
void bltn_get(char *const args[])
{
for (int i = 1; args[i]; i++) {
char *val = getenv(args[i]);
printf("%s = %s\n", args[i], val ?: "");
}
}
void bltn_set(char *const args[])
{
for (int i = 1; args[i]; i++) {
char *name = args[i];
char *val = strchr(name, '=');
*val++ = '\0';
setenv(name, val, 1);
}
}