myfun.c

一个实现基本功能的shell命令解释器

#include "myfun.h"

/***************************************************/
//Function file: myfun.c myfun.h
//Return       : void
//Var		   : void
//Author	   : Moxudong
//Verison      : V1.2
//Last amend   : 2009-03-04  by Mxd
/***************************************************/
void p_info(void)
{
	char *show, *buff;
	show = (char *)malloc(MAX/4);
	buff = (char *)malloc(MAX/4);
	strcat(show, "[ysh@");
	getcwd(buff, MAX/4);
	strcat(show, buff);
	strcat(show, "]# ");
	printf("%s", show);
}


/***************************************************/
//Function file: myfun.c myfun.h
//Return value : 0(success) or -1(falt)
//Var		   : char *source, char *argv[]
//source : the input string
//argv[] : cuted string store in aegv[]
//Author : Moxudong
//Version: V1.0
//Last amend : 2009-03-03 by Mxd
/***************************************************/
int cmd_cut(char *source, char *argv[])
{
	int  i = 0
		,loop = 0
		,space = 0
		,len = 0
		,sign = 1; // if you don't need the first space ,chose sign=0 ! 
	if((source[0] == '\n') || (source[0] == '\0') 
						   || (source[0] == ' '))
	{
		return -1;
	}
	else
	{
		len = strlen(source);
		for(loop=0; loop<len; loop++)
		{
			if(*source == ' ')
			{
				if(space == 0)   // '0':It means the first time of space's show!
				{
					*source = '\0';
					space = 1;
					sign = 1;
				}
				*source++;
			}
			else
			{
				if(sign == 1)
				{
					argv[i++] = source;
					argv[i] = NULL;
				}
				space = 0;
				sign = 0;
				*source++;
			}
		}
		return i+1;
	}
}
/****these func is in other C file*******
void redirect(void)
{
	printf("This is redirect!\n");
}

void my_pipe(void)
{
	printf("This is my pipe!\n");
}
*****************************************/
int is_founded(void)
{
	FILE *fp;
	if((fp = fopen("my_profile", "r")) == NULL)
		return -1;
	else
		return 0;
}

int init_enveriment(char *path, char *path_rec[])
{
	FILE *fp;
	if((fp = fopen("my_profile", "wb+")) == NULL)
	{
		printf("create profile error!\n");
		return -1;
	}
	else
	{
		fwrite(path, sizeof(char)*strlen(path), 1, fp);
		fclose(fp);
	}
	read_enveriment(path, path_rec);
	return 0;
}

int read_enveriment(char *path, char *path_rec[])
{
	int cnt = 0, sign = 1;
	while(*path++ != '/');
	*path--;//changed now
	while(*path != '\0')
	{
		if(*path == ':')
		{
			*path++ = '\0';
			sign = 1;
		}
		else
		{
			if(sign == 1)
			{
				path_rec[cnt++] = path;
				path_rec[cnt] = NULL;
				sign = 0;
			}
			*path++;
		}
	}
	return cnt+1;
}