1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 1997-1999 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 /*
29 * util.c -- low-level utilities used by map*.c
30 */
31 #include <stdio.h>
32 #include <string.h>
33 #include <errno.h>
34 #include <stdlib.h>
35 #include "xlator.h"
36 #include "util.h"
37 #include "errlog.h"
38
39 /*
40 * String tables -- WARNING! This uses realloc to recreate tables,
41 * so always assign table_t * return value to the current
42 * table pointer, lest the table address change in the
43 * called function.
44 */
45 static char *strset(char *, char *);
46
47 table_t *
create_stringtable(int size)48 create_stringtable(int size)
49 {
50 table_t *t;
51
52 /* Solaris idiom: malloc && memset. TBD. */
53 if ((t = calloc((size_t)1, (size_t)(sizeof (table_t) +
54 ((sizeof (char *)) * size)))) == NULL) {
55 errlog(FATAL,
56 "\nOut of memory.\n"
57 "We wish to hold the whole sky,\n"
58 "But we never will.\n");
59 }
60 t->nelem = size;
61 t->used = -1;
62 return (t);
63 }
64
65
66 table_t *
add_to_stringtable(table_t * t,char * value)67 add_to_stringtable(table_t *t, char *value)
68 {
69 table_t *t2;
70
71 int i;
72
73 if (t == NULL) {
74 seterrline(__LINE__, __FILE__, NULL, NULL);
75 errlog(FATAL|PROGRAM, "programmer error: tried to add to "
76 "a NULL table");
77 }
78 if (in_stringtable(t, value)) {
79 return (t);
80 }
81 ++t->used;
82 if (t->used >= t->nelem) {
83 if ((t2 = realloc(t, (size_t)(sizeof (table_t) +
84 ((sizeof (char *)) * (t->nelem + TABLE_INCREMENT)))))
85 == NULL) {
86 print_stringtable(t);
87 seterrline(__LINE__, __FILE__, NULL, NULL);
88 errlog(FATAL|PROGRAM, "out of memory extending a "
89 "string table");
90 }
91 t = t2;
92 t->nelem += TABLE_INCREMENT;
93 for (i = t->used; i < t->nelem; ++i) {
94 t->elements[i] = NULL;
95 }
96 }
97 t->elements[t->used] = strset(t->elements[t->used], value);
98 return (t);
99 }
100
101 /*
102 * free_stringtable -- really only mark it empty for reuse.
103 */
104 table_t *
free_stringtable(table_t * t)105 free_stringtable(table_t *t)
106 {
107
108 if (t != NULL) {
109 t->used = -1;
110 }
111 return (t);
112 }
113
114
115 char *
get_stringtable(table_t * t,int index)116 get_stringtable(table_t *t, int index)
117 {
118
119 if (t == NULL) {
120 return (NULL);
121 } else if (index > t->used) {
122 return (NULL);
123 } else {
124 return (t->elements[index]);
125 }
126 }
127
128 int
in_stringtable(table_t * t,const char * value)129 in_stringtable(table_t *t, const char *value)
130 {
131 int i;
132
133 if (t == NULL) {
134 return (0);
135 }
136 for (i = 0; i <= t->used; ++i) {
137 if (strcmp(value, t->elements[i]) == 0)
138 return (1);
139 }
140 return (0);
141 }
142
143
144 void
print_stringtable(table_t * t)145 print_stringtable(table_t *t)
146 {
147 int i;
148
149 if (t == NULL)
150 return;
151
152 errlog(VERBOSE,
153 "table size = %d elements out of %d elements/%d bytes\n",
154 t->used + 1, t->nelem,
155 sizeof (table_t) + (sizeof (char *) * t->nelem));
156
157 for (i = 0; i <= t->used; ++i) {
158 (void) fprintf(stderr, "\t%s\n",
159 get_stringtable(t, i));
160 }
161 }
162
163 static int
compare(const void * p,const void * q)164 compare(const void *p, const void *q)
165 {
166 return (strcmp((char *)p, (char *)q));
167 }
168
169 void
sort_stringtable(table_t * t)170 sort_stringtable(table_t *t)
171 {
172
173 if (t && t->used > 0) {
174 qsort((char *)t->elements, (size_t)t->used,
175 sizeof (char *), compare);
176 }
177 }
178
179
180 /*
181 * strset -- update a dynamically-allocated string or die trying.
182 */
183 /*ARGSUSED*/
184 static char *
strset(char * string,char * value)185 strset(char *string, char *value)
186 {
187 size_t vlen;
188
189 assert(value != NULL, "passed a null value to strset");
190 vlen = strlen(value);
191 if (string == NULL) {
192 /* It was never allocated, so allocate it. */
193 if ((string = malloc(vlen + 1)) == NULL) {
194 seterrline(__LINE__, __FILE__, NULL, NULL);
195 errlog(FATAL|PROGRAM, "out of memory allocating a "
196 "string");
197 }
198 } else if (strlen(string) < vlen) {
199 /* Reallocate bigger. */
200 if ((string = realloc(string, vlen + 1)) == NULL) {
201 seterrline(__LINE__, __FILE__, NULL, NULL);
202 errlog(FATAL|PROGRAM, "out of memory reallocating"
203 "a string");
204 }
205 }
206 (void) strcpy(string, value);
207 return (string);
208 }
209