[unix-history] / usr / src / cmd / ratfor / rio.c

#include "r.h"
char	ibuf[BUFSIZ];
char	*ip = ibuf;

char	type[] = {
	0,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,
	CRAP,	'\t',	'\n',	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,
	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,
	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,	CRAP,
	' ',	'!',	'"',	'#',	'$',	'%',	'&',	'\'',
	'(',	')',	'*',	'+',	',',	'-',	'.',	'/',
	DIG,	DIG,	DIG,	DIG,	DIG,	DIG,	DIG,	DIG,
	DIG,	DIG,	':',	';',	'<',	'=',	'>',	'?',
	'@',	LET,	LET,	LET,	LET,	LET,	LET,	LET,
	LET,	LET,	LET,	LET,	LET,	LET,	LET,	LET,
	LET,	LET,	LET,	LET,	LET,	LET,	LET,	LET,
	LET,	LET,	LET,	'[',	'\\',	']',	'^',	'_',
	'`',	LET,	LET,	LET,	LET,	LET,	LET,	LET,
	LET,	LET,	LET,	LET,	LET,	LET,	LET,	LET,
	LET,	LET,	LET,	LET,	LET,	LET,	LET,	LET,
	LET,	LET,	LET,	'{',	'|',	'}',	'~',	0,
};

gtok(s) char *s; {	/* get token into s */
	register c, t;
	register char *p;
	struct nlist *q;

	for(;;) {
		p = s;
		*p++ = c = getchr();
		switch(t = type[c]) {
		case 0:
			if (infptr > 0) {
				fclose(infile[infptr]);
				infptr--;
				continue;
			}
			if (svargc > 1) {
				svargc--;
				svargv++;
				if (infile[infptr] != stdin)
					fclose(infile[infptr]);
				if( (infile[infptr] = fopen(*svargv,"r")) == NULL )
					cant(*svargv);
				linect[infptr] = 0;
				curfile[infptr] = *svargv;
				continue;
			}
			return(EOF);	/* real eof */
		case ' ':
		case '\t':
			while ((c = getchr()) == ' ' || c == '\t')
				;	/* skip others */
			if (c == COMMENT || c == '_') {
				putbak(c);
				continue;
			}
			if (c != '\n') {
				putbak(c);
				*p = '\0';
				return(' ');
			} else {
				*s = '\n';
				*(s+1) = '\0';
				return(*s);
			}
		case '_':
			while ((c = getchr()) == ' ' || c == '\t')
				;
			if (c == COMMENT) {
				putbak(c);
				gtok(s);	/* recursive */
			}
			else if (c != '\n')
				putbak(c);
			continue;
		case LET:
		case DIG:
			while ((t=type[*p = getchr()]) == LET || t == DIG)
				p++;
			putbak(*p);
			*p = '\0';
			if ((q = lookup(s))->name != NULL && q->ydef == 0) {	/* found but not keyword */
				if (q->def != fcnloc) {	/* not "function" */
					pbstr(q->def);
					continue;
				}
				getfname();	/* recursive gtok */
			}
			for (p=s; *p; p++)
				if (*p>='A' && *p<='Z')
					*p += 'a' - 'A';
			for (p=s; *p; p++)
				if (*p < '0' || *p > '9')
					return(LET);
			return(DIG);
		case '[':
			*p = '\0';
			return('{');
		case ']':
			*p = '\0';
			return('}');
		case '$':
		case '\\':
			if ((*p = getchr()) == '(' || *p == ')') {
				putbak(*p=='(' ? '{' : '}');
				continue;
			}
			if (*p == '"' || *p == '\'')
				p++;
			else
				putbak(*p);
			*p = '\0';
			return('$');
		case COMMENT:
			comment[comptr++] = 'c';
			while ((comment[comptr++] = getchr()) != '\n')
				;
			flushcom();
			*s = '\n';
			*(s+1) = '\0';
			return(*s);
		case '"':
		case '\'':
			for (; (*p = getchr()) != c; p++) {
				if (*p == '\\')
					*++p = getchr();
				if (*p == '\n') {
					error("missing quote");
					putbak('\n');
					break;
				}
			}
			*p++ = c;
			*p = '\0';
			return(QUOTE);
		case '%':
			while ((*p = getchr()) != '\n')
				p++;
			putbak(*p);
			*p = '\0';
			return('%');
		case '>': case '<': case '=': case '!': case '^':
			return(peek(p, '='));
		case '&':
			return(peek(p, '&'));
		case '|':
			return(peek(p, '|'));
		case CRAP:
			continue;
		default:
			*p = '\0';
			return(*s);
		}
	}
}

gnbtok(s) char *s; {
	register c;
	while ((c = gtok(s)) == ' ' || c == '\t')
		;
	return(c);
}

getfname() {
	while (gtok(fcname) == ' ')
		;
	pbstr(fcname);
	putbak(' ');
}

peek(p, c1) char *p, c1; {
	register c;
	c = *(p-1);
	if ((*p = getchr()) == c1)
		p++;
	else
		putbak(*p);
	*p = '\0';
	return(c);
}

pbstr(str)
register char *str;
{
	register char *p;

	p = str;
	while (*p++);
	--p;
	if (ip >= &ibuf[BUFSIZ]) {
		error("pushback overflow");
		exit(1);
	}
	while (p > str)
		putbak(*--p);
}

getchr() {
	register c;

	if (ip > ibuf)
		return(*--ip);
	c = getc(infile[infptr]);
	if (c == '\n')
		linect[infptr]++;
	if (c == EOF)
		return(0);
	return(c);
}
Commit	Line	Data
44e8ed3b BJ	1	#include "r.h"
	2	char ibuf[BUFSIZ];
	3	char *ip = ibuf;
	4
	5	char type[] = {
	6	0, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP,
	7	CRAP, '\t', '\n', CRAP, CRAP, CRAP, CRAP, CRAP,
	8	CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP,
	9	CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP,
	10	' ', '!', '"', '#', '$', '%', '&', '\'',
	11	'(', ')', '*', '+', ',', '-', '.', '/',
	12	DIG, DIG, DIG, DIG, DIG, DIG, DIG, DIG,
	13	DIG, DIG, ':', ';', '<', '=', '>', '?',
	14	'@', LET, LET, LET, LET, LET, LET, LET,
	15	LET, LET, LET, LET, LET, LET, LET, LET,
	16	LET, LET, LET, LET, LET, LET, LET, LET,
	17	LET, LET, LET, '[', '\\', ']', '^', '_',
	18	'`', LET, LET, LET, LET, LET, LET, LET,
	19	LET, LET, LET, LET, LET, LET, LET, LET,
	20	LET, LET, LET, LET, LET, LET, LET, LET,
	21	LET, LET, LET, '{', '\|', '}', '~', 0,
	22	};
	23
	24	gtok(s) char s; { / get token into s */
	25	register c, t;
	26	register char *p;
	27	struct nlist *q;
	28
	29	for(;;) {
	30	p = s;
	31	*p++ = c = getchr();
	32	switch(t = type[c]) {
	33	case 0:
	34	if (infptr > 0) {
	35	fclose(infile[infptr]);
	36	infptr--;
	37	continue;
	38	}
	39	if (svargc > 1) {
	40	svargc--;
	41	svargv++;
	42	if (infile[infptr] != stdin)
	43	fclose(infile[infptr]);
	44	if( (infile[infptr] = fopen(*svargv,"r")) == NULL )
	45	cant(*svargv);
	46	linect[infptr] = 0;
	47	curfile[infptr] = *svargv;
	48	continue;
	49	}
	50	return(EOF); /* real eof */
	51	case ' ':
	52	case '\t':
	53	while ((c = getchr()) == ' ' \|\| c == '\t')
	54	; /* skip others */
	55	if (c == COMMENT \|\| c == '_') {
	56	putbak(c);
	57	continue;
	58	}
	59	if (c != '\n') {
	60	putbak(c);
	61	*p = '\0';
	62	return(' ');
	63	} else {
	64	*s = '\n';
65	*(s+1) = '\0';
66	return(*s);
67	}
68	case '_':
69	while ((c = getchr()) == ' ' \|\| c == '\t')
70	;
71	if (c == COMMENT) {
72	putbak(c);
73	gtok(s); /* recursive */
74	}
75	else if (c != '\n')
76	putbak(c);
77	continue;
78	case LET:
79	case DIG:
80	while ((t=type[*p = getchr()]) == LET \|\| t == DIG)
81	p++;
82	putbak(*p);
83	*p = '\0';
84	if ((q = lookup(s))->name != NULL && q->ydef == 0) { /* found but not keyword */
85	if (q->def != fcnloc) { /* not "function" */
86	pbstr(q->def);
87	continue;
88	}
89	getfname(); /* recursive gtok */
90	}
91	for (p=s; *p; p++)
92	if (p>='A' && p<='Z')
93	*p += 'a' - 'A';
94	for (p=s; *p; p++)
95	if (p < '0' \|\| p > '9')
96	return(LET);
97	return(DIG);
98	case '[':
99	*p = '\0';
100	return('{');
101	case ']':
102	*p = '\0';
103	return('}');
104	case '$':
105	case '\\':
106	if ((p = getchr()) == '(' \|\| p == ')') {
107	putbak(*p=='(' ? '{' : '}');
108	continue;
109	}
110	if (p == '"' \|\| p == '\'')
111	p++;
112	else
113	putbak(*p);
114	*p = '\0';
115	return('$');
116	case COMMENT:
117	comment[comptr++] = 'c';
118	while ((comment[comptr++] = getchr()) != '\n')
119	;
120	flushcom();
121	*s = '\n';
122	*(s+1) = '\0';
123	return(*s);
124	case '"':
125	case '\'':
126	for (; (*p = getchr()) != c; p++) {
127	if (*p == '\\')
128	*++p = getchr();
129	if (*p == '\n') {
130	error("missing quote");
131	putbak('\n');
132	break;
133	}
134	}
135	*p++ = c;
136	*p = '\0';
137	return(QUOTE);
138	case '%':
139	while ((*p = getchr()) != '\n')
140	p++;
141	putbak(*p);
142	*p = '\0';
143	return('%');
144	case '>': case '<': case '=': case '!': case '^':
145	return(peek(p, '='));
146	case '&':
147	return(peek(p, '&'));
148	case '\|':
149	return(peek(p, '\|'));
150	case CRAP:
151	continue;
152	default:
153	*p = '\0';
154	return(*s);
155	}
156	}
157	}
158
159	gnbtok(s) char *s; {
160	register c;
161	while ((c = gtok(s)) == ' ' \|\| c == '\t')
162	;
163	return(c);
164	}
165
166	getfname() {
167	while (gtok(fcname) == ' ')
168	;
169	pbstr(fcname);
170	putbak(' ');
171	}
172
173	peek(p, c1) char *p, c1; {
174	register c;
175	c = *(p-1);
176	if ((*p = getchr()) == c1)
177	p++;
178	else
179	putbak(*p);
180	*p = '\0';
181	return(c);
182	}
183
184	pbstr(str)
185	register char *str;
186	{
187	register char *p;
188
189	p = str;
190	while (*p++);
191	--p;
192	if (ip >= &ibuf[BUFSIZ]) {
193	error("pushback overflow");
194	exit(1);
195	}
196	while (p > str)
197	putbak(*--p);
198	}
199
200	getchr() {
201	register c;
202
203	if (ip > ibuf)
204	return(*--ip);
205	c = getc(infile[infptr]);
206	if (c == '\n')
207	linect[infptr]++;
208	if (c == EOF)
209	return(0);
210	return(c);
211	}