#include "builtin.h"
#include "utils.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <dirent.h>
#include <string.h>
#include <sys/syscall.h>
#include <fcntl.h>
char BUILTIN_COMMANDS[][MAX_COMMAND_LENGTH] = {
"type",
"cd",
"exit",
"ls",
"pwd",
"cat",
"cp",
"env"};
void type(const char commands[MAX_COMMAND_ARGC][MAX_COMMAND_LENGTH], int commands_length)
{
if (commands_length == 1)
{
fprintf(stderr, "错误：需要1个参数\n");
}
else if (commands_length == 2)
{
int flag = 0;
// 是否为内部命令
for (int i = 0; i < NUM_BUILTIN; i++)
{
if (strcmp(commands[1], BUILTIN_COMMANDS[i]) == 0)
{
flag = 1;
fprintf(stdout, "%s是shell的内部命令\n", commands[1]);
break;
}
}
// 是否为外部命令
if (!flag)
{
char external_path[256];
get_external_path(commands[1], external_path);
if (external_path[0] != '#')
{
fprintf(stdout, "%s是外部命令，路径：%s\n", commands[1], external_path);
}
else
{
fprintf(stdout, "未找到命令：%s\n", commands[1]);
}
}
}
else
{
fprintf(stderr, "错误：参数过多！\n");
}
}
void cd(const char commands[MAX_COMMAND_ARGC][MAX_COMMAND_LENGTH], int commands_length)
{
if (commands_length == 1)
{
// 无参数，不执行任何操作
return;
}
else if (commands_length == 2)
{
if (syscall(SYS_chdir, commands[1]) != 0)
{
fprintf(stderr, "错误：路径不存在或权限不足：%s\n", commands[1]);
}
}
else
{
fprintf(stderr, "错误：参数过多！\n");
}
}
void exit_shell(const char commands[MAX_COMMAND_ARGC][MAX_COMMAND_LENGTH], int commands_length)
{
if (commands_length == 1)
{
exit(0);
}
else if (commands_length == 2)
{
// 使用指定代码退出shell
if (str_is_int(commands[1]))
{
int exit_code = atoi(commands[1]);
exit(exit_code);
}
else
{
fprintf(stderr, "错误：%s非整数！\n", commands[1]);
}
}
else
{
fprintf(stderr, "错误：参数过多！\n");
}
}
void ls(const char commands[MAX_COMMAND_ARGC][MAX_COMMAND_LENGTH], int commands_length)
{
int show_hidden = 0;
if (commands_length == 1)
{
char path[] = "./";
print_file_names(path, show_hidden, 0);
}
else
{
// 查找是否有"-a"参数
for (int i = 1; i < commands_length; i++)
{
if (strcmp(commands[i], "-a") == 0)
{
show_hidden = 1;
break;
}
}
// 输出文件名
if (commands_length == 2)
{
// 输入的命令为"ls -a"或"ls <路径>"
if (show_hidden)
{
char path[] = "./";
print_file_names(path, show_hidden, 0);
}
else
{
if (!print_file_names(commands[1], show_hidden, 0))
{
fprintf(stderr, "错误：路径不存在或权限不足：%s\n", commands[1]);
}
}
}
else if (commands_length == 3)
{
// 输入的命令为"ls -a <路径>"或"ls <路径> <路径>"
for (int i = 1; i < commands_length; i++)
{
if (strcmp(commands[i], "-a") != 0)
{
if (!print_file_names(commands[i], show_hidden, !show_hidden))
{
fprintf(stderr, "错误：路径不存在或权限不足：%s\n", commands[i]);
}
else if (i < commands_length - 1 && !show_hidden)
{
fprintf(stdout, "\n");
}
}
}
}
else
{
// 输出多个路径
for (int i = 1; i < commands_length; i++)
{
if (strcmp(commands[i], "-a") != 0)
{
if (!print_file_names(commands[i], show_hidden, 1))
{
fprintf(stderr, "错误：路径不存在或权限不足：%s\n", commands[i]);
}
else if (i < commands_length - 1)
{
fprintf(stdout, "\n");
}
}
}
}
}
}
void pwd(const char commands[MAX_COMMAND_ARGC][MAX_COMMAND_LENGTH], int commands_length)
{
if (commands_length == 1)
{
char cwd[256];
syscall(SYS_getcwd, cwd, 256);
fprintf(stdout, "%s\n", cwd);
}
else
{
fprintf(stderr, "错误：参数过多！\n");
}
}
void cat(const char commands[MAX_COMMAND_ARGC][MAX_COMMAND_LENGTH], int commands_length)
{
if (commands_length == 1)
{
fprintf(stderr, "错误：至少提供一个文件\n");
}
else
{
char buffer[256];
int fd, count;
char last = '\0';
for (int i = 1; i < commands_length; i++)
{
fd = syscall(SYS_open, commands[i], O_RDONLY);
if (fd == -1)
{
fprintf(stderr, "错误：文件不存在或权限不足：%s\n", commands[i]);
continue;
}
while ((count = syscall(SYS_read, fd, buffer, sizeof(buffer))) != 0)
{
for (int j = 0; j < count; j++)
{
fprintf(stdout, "%c", buffer[j]);
last = buffer[j];
}
}
syscall(SYS_close, fd);
}
if (last != '\n' && last != '\0')
{
fprintf(stdout, "\n");
}
}
}
void cp(const char commands[MAX_COMMAND_ARGC][MAX_COMMAND_LENGTH], int commands_length)
{
if (commands_length < 3)
{
fprintf(stderr, "错误：缺少必要参数\n");
}
else if (commands_length > 3)
{
fprintf(stderr, "错误：参数过多\n");
}
else
{
if (syscall(SYS_access, commands[1], F_OK) == -1)
{
fprintf(stderr, "错误：文件不存在或权限不足：%s\n", commands[1]);
}
else
{
if (is_dir(commands[2]))
{
// 目标参数是目录，把文件复制到该目录下，文件名不变
char file_name[MAX_COMMAND_LENGTH];
char file_dst[2 * MAX_COMMAND_LENGTH];
split_path(commands[1], NULL, file_name);
strcpy(file_dst, commands[2]);
int len = strlen(file_dst);
if (file_dst[len - 1] != '/')
{
// 补上反斜杠
file_dst[len] = '/';
file_dst[len + 1] = '\0';
}
strcat(file_dst, file_name);
copy_file(file_dst, commands[1]);
}
else
{
// 目标参数是文件路径
char dir_path[MAX_COMMAND_LENGTH];
char file_name[MAX_COMMAND_LENGTH];
split_path(commands[2], dir_path, file_name);
if (is_dir(dir_path) || strcmp(file_name, commands[2]) == 0)
{
copy_file(commands[2], commands[1]);
}
else
{
fprintf(stderr, "错误：目标路径不存在或权限不足：%s\n", dir_path);
}
}
}
}
}
void env(const char commands
