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

Original BTL Ratfor System for 4.2
/* @(#)rio.c	1.1 (Berkeley) %G% */
#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
3d12707d CC	1	Original BTL Ratfor System for 4.2
	2	/* @(#)rio.c 1.1 (Berkeley) %G% */
	3	#include "r.h"
	4	char ibuf[BUFSIZ];
	5	char *ip = ibuf;
	6
	7	char type[] = {
	8	0, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP,
	9	CRAP, '\t', '\n', CRAP, CRAP, CRAP, CRAP, CRAP,
	10	CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP,
	11	CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP, CRAP,
	12	' ', '!', '"', '#', '$', '%', '&', '\'',
	13	'(', ')', '*', '+', ',', '-', '.', '/',
	14	DIG, DIG, DIG, DIG, DIG, DIG, DIG, DIG,
	15	DIG, DIG, ':', ';', '<', '=', '>', '?',
	16	'@', LET, LET, LET, LET, LET, LET, LET,
	17	LET, LET, LET, LET, LET, LET, LET, LET,
	18	LET, LET, LET, LET, LET, LET, LET, LET,
	19	LET, LET, LET, '[', '\\', ']', '^', '_',
	20	'`', LET, LET, LET, LET, LET, LET, LET,
	21	LET, LET, LET, LET, LET, LET, LET, LET,
	22	LET, LET, LET, LET, LET, LET, LET, LET,
	23	LET, LET, LET, '{', '\|', '}', '~', 0,
	24	};
	25
	26	gtok(s) char s; { / get token into s */
	27	register c, t;
	28	register char *p;
	29	struct nlist *q;
	30
	31	for(;;) {
	32	p = s;
	33	*p++ = c = getchr();
	34	switch(t = type[c]) {
	35	case 0:
	36	if (infptr > 0) {
	37	fclose(infile[infptr]);
	38	infptr--;
	39	continue;
	40	}
	41	if (svargc > 1) {
	42	svargc--;
	43	svargv++;
	44	if (infile[infptr] != stdin)
	45	fclose(infile[infptr]);
	46	if( (infile[infptr] = fopen(*svargv,"r")) == NULL )
	47	cant(*svargv);
	48	linect[infptr] = 0;
	49	curfile[infptr] = *svargv;
	50	continue;
	51	}
	52	return(EOF); /* real eof */
	53	case ' ':
	54	case '\t':
	55	while ((c = getchr()) == ' ' \|\| c == '\t')
	56	; /* skip others */
	57	if (c == COMMENT \|\| c == '_') {
	58	putbak(c);
	59	continue;
	60	}
	61	if (c != '\n') {
	62	putbak(c);
	63	*p = '\0';
	64	return(' ');
65	} else {
66	*s = '\n';
67	*(s+1) = '\0';
68	return(*s);
69	}
70	case '_':
71	while ((c = getchr()) == ' ' \|\| c == '\t')
72	;
73	if (c == COMMENT) {
74	putbak(c);
75	gtok(s); /* recursive */
76	}
77	else if (c != '\n')
78	putbak(c);
79	continue;
80	case LET:
81	case DIG:
82	while ((t=type[*p = getchr()]) == LET \|\| t == DIG)
83	p++;
84	putbak(*p);
85	*p = '\0';
86	if ((q = lookup(s))->name != NULL && q->ydef == 0) { /* found but not keyword */
87	if (q->def != fcnloc) { /* not "function" */
88	pbstr(q->def);
89	continue;
90	}
91	getfname(); /* recursive gtok */
92	}
93	for (p=s; *p; p++)
94	if (p>='A' && p<='Z')
95	*p += 'a' - 'A';
96	for (p=s; *p; p++)
97	if (p < '0' \|\| p > '9')
98	return(LET);
99	return(DIG);
100	case '[':
101	*p = '\0';
102	return('{');
103	case ']':
104	*p = '\0';
105	return('}');
106	case '$':
107	case '\\':
108	if ((p = getchr()) == '(' \|\| p == ')') {
109	putbak(*p=='(' ? '{' : '}');
110	continue;
111	}
112	if (p == '"' \|\| p == '\'')
113	p++;
114	else
115	putbak(*p);
116	*p = '\0';
117	return('$');
118	case COMMENT:
119	comment[comptr++] = 'c';
120	while ((comment[comptr++] = getchr()) != '\n')
121	;
122	flushcom();
123	*s = '\n';
124	*(s+1) = '\0';
125	return(*s);
126	case '"':
127	case '\'':
128	for (; (*p = getchr()) != c; p++) {
129	if (*p == '\\')
130	*++p = getchr();
131	if (*p == '\n') {
132	error("missing quote");
133	putbak('\n');
134	break;
135	}
136	}
137	*p++ = c;
138	*p = '\0';
139	return(QUOTE);
140	case '%':
141	while ((*p = getchr()) != '\n')
142	p++;
143	putbak(*p);
144	*p = '\0';
145	return('%');
146	case '>': case '<': case '=': case '!': case '^':
147	return(peek(p, '='));
148	case '&':
149	return(peek(p, '&'));
150	case '\|':
151	return(peek(p, '\|'));
152	case CRAP:
153	continue;
154	default:
155	*p = '\0';
156	return(*s);
157	}
158	}
159	}
160
161	gnbtok(s) char *s; {
162	register c;
163	while ((c = gtok(s)) == ' ' \|\| c == '\t')
164	;
165	return(c);
166	}
167
168	getfname() {
169	while (gtok(fcname) == ' ')
170	;
171	pbstr(fcname);
172	putbak(' ');
173	}
174
175	peek(p, c1) char *p, c1; {
176	register c;
177	c = *(p-1);
178	if ((*p = getchr()) == c1)
179	p++;
180	else
181	putbak(*p);
182	*p = '\0';
183	return(c);
184	}
185
186	pbstr(str)
187	register char *str;
188	{
189	register char *p;
190
191	p = str;
192	while (*p++);
193	--p;
194	if (ip >= &ibuf[BUFSIZ]) {
195	error("pushback overflow");
196	exit(1);
197	}
198	while (p > str)
199	putbak(*--p);
200	}
201
202	getchr() {
203	register c;
204
205	if (ip > ibuf)
206	return(*--ip);
207	c = getc(infile[infptr]);
208	if (c == '\n')
209	linect[infptr]++;
210	if (c == EOF)
211	return(0);
212	return(c);
213	}