c语言实现命令解析

1.源码实现

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void getArgs(char *str, int n)
{
    char arg[32][128];
    int u = 0;
    int i;
    int j = 0;
    int k = 0;

    for(i=0; i<n; i++)
    {
        if(str[i] == '\"')
        {
            if(u)
            {
                arg[k][j] = 0x00;
                /*printf("%s\n", arg);*/
                j = 0;
                k++;
            }

            u = !u;
        }
        else if(!u && (str[i] == ' ' || str[i] == '\t'))
        {
            arg[k][j] = 0x00;

            if(j > 0)
            {
                /*printf("%s\n", arg);*/
                k++;
            }

            j = 0;
        }
        else
        {
            arg[k][j] = str[i];
            j++;
        }
    }

    if(!u && str[i] != ' ' && str[i] != '\t')
    {
        arg[k][j] = 0x00;

        if(j > 0)
        {
            /*printf("%s\n", arg);*/
            k++;
        }

        j++;
    }

    printf("%d\n", k);

    for(i=0; i<k; i++)
    {
        printf("%s\n", arg[i]);
    }
}

int main()
{
    char linebuf[1024];
    int len;

    memset(linebuf, 0x00, sizeof(linebuf));

    while(fgets(linebuf, 1023, stdin) != NULL)
    {
        len = strlen(linebuf);

        if(linebuf[len-1] == '\n')
        {
            linebuf[len-1] = 0x00;
            len--;
        }

        getArgs(linebuf, len);
    }

    return 0;
}

2.编译源码

$ gcc -o example examle.c -std=c89

4.运行及其结果

$ ./example
xcopy /s c:\\ d:\\
4
xcopy
/s
c:\\
d:\\