parsing.c

/*
 * =====================================================================================
 *       Filename:  parsing.c
 *    Description:  
 *        Version:  1.0
 *        Created:  2013.11.02 15h44min23s
 *         Author:  wuyue (wy), vvuyve@gmail.com
 *        Company:  UESTC
 * =====================================================================================
 */
#include "wshell.h"

int parse_info_init(struct parse_info *info)
{
    info->flag = 0;
    info->in_file = NULL;
    info->out_file = NULL;
    info->command2 = NULL;
    info->parameters2 = NULL;
    return 0;
}

int parsing(char **parameters,int ParaNum,struct parse_info *info)
{
    int i;
    parse_info_init(info);
    if(strcmp(parameters[ParaNum-1],"&") ==0)
    {
        info->flag |= BACKGROUND;
        parameters[ParaNum-1] = NULL;
        ParaNum--;
    }
    for(i=0;i<ParaNum;)
    {
        if(strcmp(parameters[i],"<<")==0 || strcmp(parameters[i],"<")==0)
        {
            info->flag |= IN_REDIRECT;
            info->in_file = parameters[i+1];
            parameters[i] = NULL;
            i+=2;
        }
        else if(strcmp(parameters[i],">")==0)
        {
            info->flag |= OUT_REDIRECT;
            info->out_file = parameters[i+1];
            parameters[i] = NULL;
            i+=2;
        }
        else if(strcmp(parameters[i],">>")==0)
        {
            info->flag |= OUT_REDIRECT_APPEND;
            info->out_file = parameters[i+1];
            parameters[i] = NULL;
            i+=2;
        }
        else if(strcmp(parameters[i],"|")==0)
        {
            char* pCh;
            info->flag |= IS_PIPED;
            parameters[i] = NULL;
            info->command2 = parameters[i+1];
            info->parameters2 = &parameters[i+1];
            for(pCh = info->parameters2[0]+strlen(info->parameters2[0]);
                    pCh!=&(info->parameters2[0][0]) && *pCh!='/';pCh--)
                ;
            if(*pCh == '/')
                pCh++;
            info->parameters2[0] = pCh;
            break;
        }
        else
            i++;
    }
#ifdef DEBUG
	printf("\nbackground:%s\n",info->flag&BACKGROUND?"yes":"no");
	printf("in redirect:");
	info->flag&IN_REDIRECT?printf("yes,file:%s\n",info->in_file):printf("no\n");
	printf("out redirect:");
	info->flag&OUT_REDIRECT?printf("yes,file:%s\n",info->out_file):printf("no\n");
	printf("pipe:");
	info->flag&IS_PIPED?printf("yes,command:%s %s %s\n",info->command2,info->parameters2[0],info->parameters2[1]):printf("no\n");
#endif
    return 1;
}