98 lines
1.7 KiB
C
98 lines
1.7 KiB
C
#include <glob.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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#define DELIMS " \t\n"
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struct cmd_st
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{
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glob_t globres;
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};
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static void prompt(void)
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{
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printf("mysh-0.1$ ");
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}
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/**
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* @brief 解析命令行
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* @details
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* line 不加 const 是考虑以后可能加 alias 功能
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*
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* @param line
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* @param res
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*/
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static void parse(char *line, struct cmd_st *res)
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{
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char *tok;
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int i = 0;
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//* 根据分隔符分割小串
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// strtok();
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while (1)
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{
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tok = strsep(&line, DELIMS);
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if (NULL == tok)
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break;
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if ('\0' == tok[0]) // 判断是否为空串
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continue;
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// 用glob nocheck 来解析
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// 用 i 来让第一次不追加
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glob(tok, GLOB_NOCHECK | GLOB_APPEND * i, NULL, &res->globres);
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i = 1;
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}
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}
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int main(int argc, char **argv)
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{
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char *linebuf = NULL;
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size_t linebuf_size = 0;
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struct cmd_st cmd;
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pid_t pid;
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while (1)
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{
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prompt( );
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if (getline(&linebuf, &linebuf_size, stdin) < 0)
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break;
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parse(linebuf, &cmd);
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if (0)
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{
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/* dosomething */
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}
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else // 外部命令
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{
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pid = fork( );
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if (pid < 0)
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{
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perror("fork");
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exit(1);
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}
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if (0 == pid) // child
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{
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execvp(cmd.globres.gl_pathv[0], cmd.globres.gl_pathv);
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perror("execvp");
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exit(1);
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}
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else // parent
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{
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wait(NULL);
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}
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}
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}
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exit(0);
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} |