Annotation of src/usr.bin/rdist/lookup.c, Revision 1.15
1.15 ! guenther 1: /* $OpenBSD: lookup.c,v 1.14 2012/11/12 01:14:41 guenther 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.
1.12 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
1.15 ! guenther 32: #include <string.h>
! 33:
! 34: #include "client.h"
1.1 deraadt 35:
36: /* symbol types */
37: #define VAR 1
38: #define CONST 2
39:
40: struct syment {
41: int s_type;
42: char *s_name;
43: struct namelist *s_value;
44: struct syment *s_next;
45: };
46:
47: static struct syment *hashtab[HASHSIZE];
48:
49: /*
50: * Define a variable from a command line argument.
51: */
1.8 millert 52: void
1.11 millert 53: define(char *name)
1.1 deraadt 54: {
1.9 mpech 55: char *cp, *s;
56: struct namelist *nl;
1.1 deraadt 57: struct namelist *value;
58:
1.2 dm 59: debugmsg(DM_CALL, "define(%s)", name);
1.1 deraadt 60:
1.2 dm 61: cp = strchr(name, '=');
1.1 deraadt 62: if (cp == NULL)
63: value = NULL;
64: else if (cp[1] == '\0') {
65: *cp = '\0';
66: value = NULL;
67: } else if (cp[1] != '(') {
68: *cp++ = '\0';
69: value = makenl(cp);
70: } else {
1.2 dm 71: value = NULL;
1.1 deraadt 72: nl = NULL;
73: *cp++ = '\0';
74: do
75: cp++;
76: while (*cp == ' ' || *cp == '\t');
77: for (s = cp; ; s++) {
78: switch (*s) {
79: case ')':
80: *s = '\0';
81: case '\0':
82: break;
83: case ' ':
84: case '\t':
85: *s++ = '\0';
86: while (*s == ' ' || *s == '\t')
87: s++;
88: if (*s == ')')
89: *s = '\0';
90: break;
91: default:
92: continue;
93: }
94: if (nl == NULL)
95: value = nl = makenl(cp);
96: else {
97: nl->n_next = makenl(cp);
98: nl = nl->n_next;
99: }
100: if (*s == '\0')
101: break;
102: cp = s;
103: }
104: }
105: (void) lookup(name, REPLACE, value);
106: }
107:
108: /*
109: * Lookup name in the table and return a pointer to it.
110: * LOOKUP - just do lookup, return NULL if not found.
111: * INSERT - insert name with value, error if already defined.
112: * REPLACE - insert or replace name with value.
113: */
114:
115: struct namelist *
1.11 millert 116: lookup(char *name, int action, struct namelist *value)
1.1 deraadt 117: {
1.10 deraadt 118: unsigned int n;
1.9 mpech 119: char *cp;
120: struct syment *s;
1.2 dm 121: char ebuf[BUFSIZ];
1.1 deraadt 122:
1.14 guenther 123: debugmsg(DM_CALL, "lookup(%s, %d, %p)", name, action, value);
1.1 deraadt 124:
125: n = 0;
126: for (cp = name; *cp; )
127: n += *cp++;
128: n %= HASHSIZE;
129:
130: for (s = hashtab[n]; s != NULL; s = s->s_next) {
131: if (strcmp(name, s->s_name))
132: continue;
133: if (action != LOOKUP) {
134: if (action != INSERT || s->s_type != CONST) {
1.7 millert 135: (void) snprintf(ebuf, sizeof(ebuf),
1.11 millert 136: "%.*s redefined",
137: (int)(sizeof(ebuf) -
138: sizeof(" redefined")), name);
1.2 dm 139: yyerror(ebuf);
1.1 deraadt 140: }
141: }
142: return(s->s_value);
143: }
144:
145: if (action == LOOKUP) {
1.11 millert 146: (void) snprintf(ebuf, sizeof(ebuf), "%.*s undefined",
147: (int)(sizeof(ebuf) - sizeof(" undefined")),
148: name);
1.2 dm 149: yyerror(ebuf);
1.1 deraadt 150: return(NULL);
151: }
152:
153: s = ALLOC(syment);
154: s->s_next = hashtab[n];
155: hashtab[n] = s;
156: s->s_type = action == INSERT ? VAR : CONST;
157: s->s_name = name;
158: s->s_value = value;
1.2 dm 159:
1.1 deraadt 160: return(value);
161: }
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