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sh: add builtins

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This commit is contained in:
apio 2022-10-19 20:34:10 +02:00
parent 20db8eaba6
commit a815beacfb
1 changed files with 36 additions and 2 deletions
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38
apps/src/sh.c
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@ -1,6 +1,7 @@
#include <luna.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
@ -9,8 +10,8 @@ static int status;
typedef struct
{
char* buffer;
long size;
long capacity;
size_t size;
size_t capacity;
} command;
void show_prompt()
@ -18,6 +19,33 @@ void show_prompt()
printf("[%ld]> ", getpid());
}
int command_matches(command* cmd, const char* string)
{
if (cmd->size <= strlen(string)) // cmd->size includes null terminator
return 0;
return strncmp(cmd->buffer, string, strlen(string)) == 0;
}
int command_matches_exactly(command* cmd, const char* string)
{
if (cmd->size <= strlen(string)) // cmd->size includes null terminator
return 0;
if (cmd->size > (strlen(string) + 1)) return 0;
return strncmp(cmd->buffer, string, strlen(string)) == 0;
}
int command_match_builtins(command* cmd)
{
if (command_matches(cmd, "exit ")) { exit(atoi(cmd->buffer + 5)); }
if (command_matches_exactly(cmd, "exit")) { exit(0); }
if (command_matches_exactly(cmd, "pid"))
{
printf("pid %ld, ppid %ld\n", getpid(), getppid());
return 1;
}
return 0;
}
void command_expand(command* cmd, long new_capacity)
{
char* buffer = realloc(cmd->buffer, new_capacity);
@ -58,6 +86,12 @@ void command_clear(command* cmd)
void command_execute(command* cmd)
{
command_push(cmd, '\0');
if (command_match_builtins(cmd))
{
command_clear(cmd);
show_prompt();
return;
}
pid_t child = fork();
if (child < 0)
{