基于C语言实现的Linux命令解释程序源码+项目文档说明（个人毕设）.zip

#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