Annotation of src/usr.bin/rdist/lookup.c, Revision 1.10
1.10 ! deraadt 1: /* $OpenBSD: lookup.c,v 1.9 2001/11/19 19:02:15 mpech Exp $ */
1.4 deraadt 2:
1.1 deraadt 3: /*
1.2 dm 4: * Copyright (c) 1983 Regents of the University of California.
5: * All rights reserved.
1.1 deraadt 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
1.8 millert 37: #if 0
1.2 dm 38: static char RCSid[] =
1.8 millert 39: "$From: lookup.c,v 6.8 1996/07/19 16:49:55 michaelc Exp $";
40: #else
41: static char RCSid[] =
1.10 ! deraadt 42: "$OpenBSD: lookup.c,v 1.9 2001/11/19 19:02:15 mpech Exp $";
1.8 millert 43: #endif
1.2 dm 44:
45: static char sccsid[] = "@(#)lookup.c 5.1 (Berkeley) 6/6/85";
46:
47: static char copyright[] =
48: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
49: All rights reserved.\n";
1.1 deraadt 50: #endif /* not lint */
51:
52: #include "defs.h"
53:
54: /* symbol types */
55: #define VAR 1
56: #define CONST 2
57:
58: struct syment {
59: int s_type;
60: char *s_name;
61: struct namelist *s_value;
62: struct syment *s_next;
63: };
64:
65: static struct syment *hashtab[HASHSIZE];
66:
67: /*
68: * Define a variable from a command line argument.
69: */
1.8 millert 70: void
1.1 deraadt 71: define(name)
72: char *name;
73: {
1.9 mpech 74: char *cp, *s;
75: struct namelist *nl;
1.1 deraadt 76: struct namelist *value;
77:
1.2 dm 78: debugmsg(DM_CALL, "define(%s)", name);
1.1 deraadt 79:
1.2 dm 80: cp = strchr(name, '=');
1.1 deraadt 81: if (cp == NULL)
82: value = NULL;
83: else if (cp[1] == '\0') {
84: *cp = '\0';
85: value = NULL;
86: } else if (cp[1] != '(') {
87: *cp++ = '\0';
88: value = makenl(cp);
89: } else {
1.2 dm 90: value = NULL;
1.1 deraadt 91: nl = NULL;
92: *cp++ = '\0';
93: do
94: cp++;
95: while (*cp == ' ' || *cp == '\t');
96: for (s = cp; ; s++) {
97: switch (*s) {
98: case ')':
99: *s = '\0';
100: case '\0':
101: break;
102: case ' ':
103: case '\t':
104: *s++ = '\0';
105: while (*s == ' ' || *s == '\t')
106: s++;
107: if (*s == ')')
108: *s = '\0';
109: break;
110: default:
111: continue;
112: }
113: if (nl == NULL)
114: value = nl = makenl(cp);
115: else {
116: nl->n_next = makenl(cp);
117: nl = nl->n_next;
118: }
119: if (*s == '\0')
120: break;
121: cp = s;
122: }
123: }
124: (void) lookup(name, REPLACE, value);
125: }
126:
127: /*
128: * Lookup name in the table and return a pointer to it.
129: * LOOKUP - just do lookup, return NULL if not found.
130: * INSERT - insert name with value, error if already defined.
131: * REPLACE - insert or replace name with value.
132: */
133:
134: struct namelist *
1.2 dm 135: lookup(name, action, value) /* %% in name. Ignore quotas in name */
1.1 deraadt 136: char *name;
137: int action;
138: struct namelist *value;
139: {
1.10 ! deraadt 140: unsigned int n;
1.9 mpech 141: char *cp;
142: struct syment *s;
1.2 dm 143: char ebuf[BUFSIZ];
1.1 deraadt 144:
1.2 dm 145: debugmsg(DM_CALL, "lookup(%s, %d, %x)", name, action, value);
1.1 deraadt 146:
147: n = 0;
148: for (cp = name; *cp; )
149: n += *cp++;
150: n %= HASHSIZE;
151:
152: for (s = hashtab[n]; s != NULL; s = s->s_next) {
153: if (strcmp(name, s->s_name))
154: continue;
155: if (action != LOOKUP) {
156: if (action != INSERT || s->s_type != CONST) {
1.7 millert 157: (void) snprintf(ebuf, sizeof(ebuf),
158: "%s redefined", name);
1.2 dm 159: yyerror(ebuf);
1.1 deraadt 160: }
161: }
162: return(s->s_value);
163: }
164:
165: if (action == LOOKUP) {
1.6 mickey 166: (void) snprintf(ebuf, sizeof(ebuf), "%s undefined", name);
1.2 dm 167: yyerror(ebuf);
1.1 deraadt 168: return(NULL);
169: }
170:
171: s = ALLOC(syment);
172: s->s_next = hashtab[n];
173: hashtab[n] = s;
174: s->s_type = action == INSERT ? VAR : CONST;
175: s->s_name = name;
176: s->s_value = value;
1.2 dm 177:
1.1 deraadt 178: return(value);
179: }
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