mem.c

unix v7是最后一个广泛发布的研究型UNIX版本

# include "stdio.h"
# include "lrnref"
# define SAME 0

struct keys {
	char *k_wd;
	int k_val;
} keybuff[] = {
	{"ready",	READY},
	{"answer",	READY},
	{"#print",	PRINT},
	{"#copyin",	COPYIN},
	{"#uncopyin",	UNCOPIN},
	{"#copyout",	COPYOUT},
	{"#uncopyout",	UNCOPOUT},
	{"#pipe",	PIPE},
	{"#unpipe",	UNPIPE},
	{"#succeed",	SUCCEED},
	{"#fail",	FAIL},
	{"bye",		BYE},
	{"chdir",	CHDIR},
	{"cd",		CHDIR},
	{"learn",	LEARN},
	{"#log",	LOG},
	{"yes",		YES},
	{"no",		NO},
	{"#mv",		MV},
	{"#user",	USER},
	{"#next",	NEXT},
	{"skip",	SKIP},
	{"#where",	WHERE},
	{"#match",	MATCH},
	{"#bad",	BAD},
	{"#create",	CREATE},
	{"#cmp",	CMP},
	{"#goto",	GOTO},
	{"#once",	ONCE},
	{"#",		NOP},
	{NULL,		0}
};

int *action(s)
char *s;
{
	struct keys *kp;
	for (kp=keybuff; kp->k_wd; kp++)
		if (strcmp(kp->k_wd, s) == SAME)
			return(&(kp->k_val));
	return(NULL);
}

# define NW 100
# define NWCH 800
struct whichdid {
	char *w_less;
	int w_seq;
} which[NW];
int nwh = 0;
char whbuff[NWCH];
char *whcp = whbuff;

setdid(lesson, sequence)
char *lesson;
{
	struct whichdid *pw;
	for(pw=which; pw < which+nwh; pw++)
		if (strcmp(pw->w_less, lesson) == SAME)
			{
			pw->w_seq = sequence;
			return;
			}
	pw=which+nwh++;
	if (nwh >= NW) {
		fprintf(stderr, "nwh>=NW\n");
		wrapup(1);
	}
	pw->w_seq = sequence;
	pw->w_less = whcp;
	while (*whcp++ = *lesson++);
	if (whcp >= whbuff + NWCH) {
		fprintf(stderr, "lesson name too long\n");
		wrapup(1);
	}
}

already(lesson, sequence)
char *lesson;
{
	struct whichdid *pw;
	for (pw=which; pw < which+nwh; pw++)
		if (strcmp(pw->w_less, lesson) == SAME)
			return(1);
	return(0);
}