[unix-history] / usr / src / usr.bin / window / parser1.c

#ifndef lint
static char sccsid[] = "@(#)parser1.c	3.16 %G%";
#endif

#include "parser.h"

p_start()
{
	char flag = 1;

	(void) s_gettok();
	for (;;) {
		p_statementlist(flag);
		if (token == T_EOF || p_abort())
			break;
		flag = 0;
		p_synerror();
		while (token != T_EOL && token != T_EOF) {
			if (token == T_STR)
				str_free(token_str);
			(void) s_gettok();
		}
		if (token == T_EOL)
			(void) s_gettok();
		p_clearerr();
	}
}

p_statementlist(flag)
char flag;
{
	for (; p_statement(flag) >= 0; p_clearerr())
		;
}

p_statement(flag)
char flag;
{
	switch (token) {
	case T_EOL:
		(void) s_gettok();
		return 0;
	case T_IF:
		return p_if(flag);
	default:
		return p_command(flag);
	}
}

p_if(flag)
char flag;
{
	struct value t;
	char true = 0;

top:
	(void) s_gettok();

	if (p_expr(&t, flag) < 0) {
		p_synerror();
		return -1;
	}
	switch (t.v_type) {
	case V_NUM:
		true = !true && t.v_num != 0;
		break;
	case V_STR:
		p_error("if: Numeric value required.");
		str_free(t.v_str);
	case V_ERR:
		flag = 0;
		break;
	}

	if (token != T_THEN) {
		p_synerror();
		return -1;
	}

	(void) s_gettok();
	p_statementlist(flag && true);
	if (p_erred())
		return -1;

	if (token == T_ELSIF)
		goto top;

	if (token == T_ELSE) {
		(void) s_gettok();
		p_statementlist(flag && !true);
		if (p_erred())
			return -1;
	}

	if (token == T_ENDIF) {
		(void) s_gettok();
		return 0;
	}

	p_synerror();
	return -1;
}

p_command(flag)
char flag;
{
	struct value t;
	char *cmd;
	int p_function(), p_assign();

	switch (token) {
	case T_MOD:
		t.v_type = V_STR;
		t.v_str = str_cpy("%");
		(void) s_gettok();
		break;
	case T_NUM:
		t.v_type = V_NUM;
		t.v_num = token_num;
		(void) s_gettok();
		break;
	case T_STR:
		t.v_type = V_STR;
		t.v_str = token_str;
		(void) s_gettok();
		break;
	default:
		if (p_expr(&t, flag) < 0)
			return -1;
		if (token == T_EOF) {
			val_free(t);
			return 0;
		}
	}
	if (token != T_ASSIGN && p_convstr(&t) < 0)
		return -1;
	cmd = t.v_type == V_STR ? t.v_str : 0;
	if ((*(token == T_ASSIGN ? p_assign : p_function))(cmd, &t, flag) < 0) {
		if (cmd)
			str_free(cmd);
		return -1;
	}
	if (cmd)
		str_free(cmd);
	val_free(t);
	if (token == T_EOL)
		(void) s_gettok();
	else if (token != T_EOF) {
		p_synerror();
		return -1;
	}
	return 0;
}

p_convstr(v)
register struct value *v;
{
	if (v->v_type != V_NUM)
		return 0;
	if ((v->v_str = str_itoa(v->v_num)) == 0) {
		p_memerror();
		v->v_type = V_ERR;
		return -1;
	}
	v->v_type = V_STR;
	return 0;
}

p_synerror()
{
	if (!cx.x_synerred) {
		cx.x_synerred = cx.x_erred = 1;
		error("Syntax error.");
	}
}

/*VARARGS1*/
p_error(msg, a, b, c)
char *msg;
{
	if (!cx.x_erred) {
		cx.x_erred = 1;
		error(msg, a, b, c);
	}
}

p_memerror()
{
	cx.x_erred = cx.x_abort = 1;
	error("Out of memory.");
}
Commit	Line	Data
b0c08430	1	#ifndef lint
fbbe9777	2	static char sccsid[] = "@(#)parser1.c 3.16 %G%";
b0c08430 EW	3	#endif
b0c08430 EW	4
a7b2e18a	5	#include "parser.h"
b0c08430 EW	6
	7	p_start()
	8	{
	9	char flag = 1;
	10
	11	(void) s_gettok();
	12	for (;;) {
	13	p_statementlist(flag);
	14	if (token == T_EOF \|\| p_abort())
	15	break;
	16	flag = 0;
	17	p_synerror();
	18	while (token != T_EOL && token != T_EOF) {
	19	if (token == T_STR)
	20	str_free(token_str);
	21	(void) s_gettok();
	22	}
	23	if (token == T_EOL)
	24	(void) s_gettok();
	25	p_clearerr();
	26	}
	27	}
	28
	29	p_statementlist(flag)
	30	char flag;
	31	{
63f7da95 EW	32	for (; p_statement(flag) >= 0; p_clearerr())
63f7da95 EW	33	;
b0c08430 EW	34	}
	35
	36	p_statement(flag)
	37	char flag;
	38	{
b0c08430 EW	39	switch (token) {
b0c08430 EW	40	case T_EOL:
b0c08430 EW	41	(void) s_gettok();
	42	return 0;
	43	case T_IF:
b0c08430 EW	44	return p_if(flag);
b0c08430 EW	45	default:
b0c08430 EW	46	return p_command(flag);
	47	}
	48	}
	49
	50	p_if(flag)
	51	char flag;
	52	{
	53	struct value t;
	54	char true = 0;
	55
	56	top:
	57	(void) s_gettok();
	58
	59	if (p_expr(&t, flag) < 0) {
	60	p_synerror();
	61	return -1;
	62	}
	63	switch (t.v_type) {
	64	case V_NUM:
	65	true = !true && t.v_num != 0;
	66	break;
	67	case V_STR:
fbbe9777	68	p_error("if: Numeric value required.");
b0c08430 EW	69	str_free(t.v_str);
	70	case V_ERR:
	71	flag = 0;
	72	break;
	73	}
	74
	75	if (token != T_THEN) {
	76	p_synerror();
	77	return -1;
	78	}
	79
	80	(void) s_gettok();
	81	p_statementlist(flag && true);
	82	if (p_erred())
	83	return -1;
	84
	85	if (token == T_ELSIF)
	86	goto top;
	87
	88	if (token == T_ELSE) {
	89	(void) s_gettok();
	90	p_statementlist(flag && !true);
	91	if (p_erred())
	92	return -1;
	93	}
	94
	95	if (token == T_ENDIF) {
	96	(void) s_gettok();
	97	return 0;
	98	}
	99
	100	p_synerror();
	101	return -1;
	102	}
	103
	104	p_command(flag)
	105	char flag;
	106	{
	107	struct value t;
	108	char *cmd;
bb4a0c0b	109	int p_function(), p_assign();
b0c08430	110
b0c08430 EW	111	switch (token) {
	112	case T_MOD:
	113	t.v_type = V_STR;
803a666e	114	t.v_str = str_cpy("%");
b0c08430 EW	115	(void) s_gettok();
	116	break;
	117	case T_NUM:
	118	t.v_type = V_NUM;
	119	t.v_num = token_num;
	120	(void) s_gettok();
	121	break;
	122	case T_STR:
	123	t.v_type = V_STR;
	124	t.v_str = token_str;
	125	(void) s_gettok();
	126	break;
	127	default:
	128	if (p_expr(&t, flag) < 0)
	129	return -1;
	130	if (token == T_EOF) {
474b372d	131	val_free(t);
b0c08430 EW	132	return 0;
	133	}
	134	}
bb4a0c0b EW	135	if (token != T_ASSIGN && p_convstr(&t) < 0)
	136	return -1;
	137	cmd = t.v_type == V_STR ? t.v_str : 0;
	138	if ((*(token == T_ASSIGN ? p_assign : p_function))(cmd, &t, flag) < 0) {
	139	if (cmd)
	140	str_free(cmd);
	141	return -1;
b0c08430	142	}
f8e2d916 EW	143	if (cmd)
f8e2d916 EW	144	str_free(cmd);
474b372d	145	val_free(t);
b0c08430 EW	146	if (token == T_EOL)
	147	(void) s_gettok();
	148	else if (token != T_EOF) {
	149	p_synerror();
	150	return -1;
	151	}
	152	return 0;
	153	}
	154
0180c2d9 EW	155	p_convstr(v)
	156	register struct value *v;
	157	{
	158	if (v->v_type != V_NUM)
	159	return 0;
	160	if ((v->v_str = str_itoa(v->v_num)) == 0) {
	161	p_memerror();
	162	v->v_type = V_ERR;
	163	return -1;
	164	}
	165	v->v_type = V_STR;
	166	return 0;
	167	}
	168
b0c08430 EW	169	p_synerror()
	170	{
	171	if (!cx.x_synerred) {
	172	cx.x_synerred = cx.x_erred = 1;
	173	error("Syntax error.");
	174	}
	175	}
	176
	177	/VARARGS1/
	178	p_error(msg, a, b, c)
	179	char *msg;
	180	{
	181	if (!cx.x_erred) {
	182	cx.x_erred = 1;
	183	error(msg, a, b, c);
	184	}
	185	}
	186
	187	p_memerror()
	188	{
	189	cx.x_erred = cx.x_abort = 1;
	190	error("Out of memory.");
	191	}