myshell.c

Linux下的shell解释器

#include <stdio.h>
#include <string.h>
#include <litimts.h>
#include <unistd.h>
#include <sys/types.h>


#define MAX_CANON 256
#define PROMPT_STRING "[myshell]$"
#define QUIT_STRING "exit\n"

static char inbuf[MAX_CANON];

char* g_ptr;

char* g_lim;

extern void yylex();

int main(void){
	for(;;)
	{
		if(fputs(PROMPT_STRING,stdout)==EOF)
			continue;
		if(fgets(inbuf,MAX_CANON,stdin)==NULL)
			continue;
		if(strcmp(inbuf,QUIT_STRING)==0)
			break;
		g_ptr=inbuf;
		g_lim=inbuf+strlen(inbuf);
		yylex();
	}
	return 0;
}