Annotation of src/usr.bin/m4/look.c, Revision 1.5
1.5 ! espie 1: /* $OpenBSD: look.c,v 1.4 1999/09/14 08:35:16 espie Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*
4: * Copyright (c) 1989, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Ozan Yigit at York University.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #ifndef lint
40: static char sccsid[] = "@(#)look.c 8.1 (Berkeley) 6/6/93";
41: #endif /* not lint */
42:
43: /*
44: * look.c
45: * Facility: m4 macro processor
46: * by: oz
47: */
48:
49: #include <sys/types.h>
50: #include <stdio.h>
51: #include <stdlib.h>
1.3 espie 52: #include <stddef.h>
1.1 deraadt 53: #include <string.h>
54: #include "mdef.h"
55: #include "stdd.h"
56: #include "extern.h"
57:
1.5 ! espie 58: static void freent __P((ndptr));
! 59:
1.1 deraadt 60: int
61: hash(name)
1.5 ! espie 62: const char *name;
1.1 deraadt 63: {
1.4 espie 64: unsigned long h = 0;
1.1 deraadt 65: while (*name)
66: h = (h << 5) + h + *name++;
67: return (h % HASHSIZE);
68: }
69:
70: /*
71: * find name in the hash table
72: */
73: ndptr
74: lookup(name)
1.5 ! espie 75: const char *name;
1.1 deraadt 76: {
1.4 espie 77: ndptr p;
1.1 deraadt 78:
79: for (p = hashtab[hash(name)]; p != nil; p = p->nxtptr)
80: if (STREQ(name, p->name))
81: break;
82: return (p);
83: }
84:
85: /*
86: * hash and create an entry in the hash table.
87: * The new entry is added in front of a hash bucket.
88: */
89: ndptr
90: addent(name)
1.5 ! espie 91: const char *name;
1.1 deraadt 92: {
1.4 espie 93: int h;
1.1 deraadt 94: ndptr p;
95:
96: h = hash(name);
97: p = (ndptr) xalloc(sizeof(struct ndblock));
98: p->nxtptr = hashtab[h];
99: hashtab[h] = p;
100: p->name = xstrdup(name);
101: return p;
102: }
103:
104: static void
105: freent(p)
1.4 espie 106: ndptr p;
1.1 deraadt 107: {
108: if (!(p->type & STATIC)) {
109: free((char *) p->name);
110: if (p->defn != null)
111: free((char *) p->defn);
112: }
113: free((char *) p);
114: }
115:
116: /*
117: * remove an entry from the hashtable
118: */
119: void
120: remhash(name, all)
1.5 ! espie 121: const char *name;
1.4 espie 122: int all;
1.1 deraadt 123: {
1.4 espie 124: int h;
125: ndptr xp, tp, mp;
1.1 deraadt 126:
127: h = hash(name);
128: mp = hashtab[h];
129: tp = nil;
130: while (mp != nil) {
131: if (STREQ(mp->name, name)) {
132: mp = mp->nxtptr;
133: if (tp == nil) {
134: freent(hashtab[h]);
135: hashtab[h] = mp;
136: }
137: else {
138: xp = tp->nxtptr;
139: tp->nxtptr = mp;
140: freent(xp);
141: }
142: if (!all)
143: break;
144: }
145: else {
146: tp = mp;
147: mp = mp->nxtptr;
148: }
149: }
150: }
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