1 /* $OpenBSD: look.c,v 1.22 2010/09/07 19:58:09 marco Exp $ */ 2 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 /* 38 * look.c 39 * Facility: m4 macro processor 40 * by: oz 41 */ 42 43 #include <sys/types.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <stdint.h> 47 #include <stddef.h> 48 #include <string.h> 49 #include <ohash.h> 50 #include "mdef.h" 51 #include "stdd.h" 52 #include "extern.h" 53 54 static void *hash_alloc(size_t, void *); 55 static void hash_free(void *, size_t, void *); 56 static void *element_alloc(size_t, void *); 57 static void setup_definition(struct macro_definition *, const char *, 58 const char *); 59 60 static struct ohash_info macro_info = { 61 offsetof(struct ndblock, name), 62 NULL, hash_alloc, hash_free, element_alloc }; 63 64 struct ohash macros; 65 66 /* Support routines for hash tables. */ 67 void * 68 hash_alloc(size_t s, __unused void *u) 69 { 70 void *storage = xalloc(s, "hash alloc"); 71 if (storage) 72 memset(storage, 0, s); 73 return storage; 74 } 75 76 void 77 hash_free(void *p, __unused size_t s, __unused void *u) 78 { 79 free(p); 80 } 81 82 void * 83 element_alloc(size_t s, __unused void *u) 84 { 85 return xalloc(s, "element alloc"); 86 } 87 88 void 89 init_macros(void) 90 { 91 ohash_init(¯os, 10, ¯o_info); 92 } 93 94 /* 95 * find name in the hash table 96 */ 97 ndptr 98 lookup(const char *name) 99 { 100 return ohash_find(¯os, ohash_qlookup(¯os, name)); 101 } 102 103 struct macro_definition * 104 lookup_macro_definition(const char *name) 105 { 106 ndptr p; 107 108 p = ohash_find(¯os, ohash_qlookup(¯os, name)); 109 if (p) 110 return p->d; 111 else 112 return NULL; 113 } 114 115 static void 116 setup_definition(struct macro_definition *d, const char *defn, const char *name) 117 { 118 ndptr p; 119 120 if (strncmp(defn, BUILTIN_MARKER, sizeof(BUILTIN_MARKER)-1) == 0 && 121 (p = macro_getbuiltin(defn+sizeof(BUILTIN_MARKER)-1)) != NULL) { 122 d->type = macro_builtin_type(p); 123 d->defn = xstrdup(defn+sizeof(BUILTIN_MARKER)-1); 124 } else { 125 if (!*defn) 126 d->defn = __DECONST(char *, null); 127 else 128 d->defn = xstrdup(defn); 129 d->type = MACRTYPE; 130 } 131 if (STREQ(name, defn)) 132 d->type |= RECDEF; 133 } 134 135 static ndptr 136 create_entry(const char *name) 137 { 138 const char *end = NULL; 139 unsigned int i; 140 ndptr n; 141 142 i = ohash_qlookupi(¯os, name, &end); 143 n = ohash_find(¯os, i); 144 if (n == NULL) { 145 n = ohash_create_entry(¯o_info, name, &end); 146 ohash_insert(¯os, i, n); 147 n->trace_flags = FLAG_NO_TRACE; 148 n->builtin_type = MACRTYPE; 149 n->d = NULL; 150 } 151 return n; 152 } 153 154 void 155 macro_define(const char *name, const char *defn) 156 { 157 ndptr n = create_entry(name); 158 if (n->d != NULL) { 159 if (n->d->defn != null) 160 free(n->d->defn); 161 } else { 162 n->d = xalloc(sizeof(struct macro_definition), NULL); 163 n->d->next = NULL; 164 } 165 setup_definition(n->d, defn, name); 166 } 167 168 void 169 macro_pushdef(const char *name, const char *defn) 170 { 171 ndptr n; 172 struct macro_definition *d; 173 174 n = create_entry(name); 175 d = xalloc(sizeof(struct macro_definition), NULL); 176 d->next = n->d; 177 n->d = d; 178 setup_definition(n->d, defn, name); 179 } 180 181 void 182 macro_undefine(const char *name) 183 { 184 ndptr n = lookup(name); 185 if (n != NULL) { 186 struct macro_definition *r, *r2; 187 188 for (r = n->d; r != NULL; r = r2) { 189 r2 = r->next; 190 if (r->defn != null) 191 free(r->defn); 192 free(r); 193 } 194 n->d = NULL; 195 } 196 } 197 198 void 199 macro_popdef(const char *name) 200 { 201 ndptr n = lookup(name); 202 203 if (n != NULL) { 204 struct macro_definition *r = n->d; 205 if (r != NULL) { 206 n->d = r->next; 207 if (r->defn != null) 208 free(r->defn); 209 free(r); 210 } 211 } 212 } 213 214 void 215 macro_for_all(void (*f)(const char *, struct macro_definition *)) 216 { 217 ndptr n; 218 unsigned int i; 219 220 for (n = ohash_first(¯os, &i); n != NULL; 221 n = ohash_next(¯os, &i)) 222 if (n->d != NULL) 223 f(n->name, n->d); 224 } 225 226 void 227 setup_builtin(const char *name, unsigned int type) 228 { 229 ndptr n; 230 char *name2; 231 232 if (prefix_builtins) { 233 name2 = xalloc(strlen(name)+3+1, NULL); 234 memcpy(name2, "m4_", 3); 235 memcpy(name2 + 3, name, strlen(name)+1); 236 } else 237 name2 = xstrdup(name); 238 239 n = create_entry(name2); 240 n->builtin_type = type; 241 n->d = xalloc(sizeof(struct macro_definition), NULL); 242 n->d->defn = name2; 243 n->d->type = type; 244 n->d->next = NULL; 245 } 246 247 void 248 mark_traced(const char *name, int on) 249 { 250 ndptr p; 251 unsigned int i; 252 253 if (name == NULL) { 254 if (on) 255 trace_flags |= TRACE_ALL; 256 else 257 trace_flags &= ~TRACE_ALL; 258 for (p = ohash_first(¯os, &i); p != NULL; 259 p = ohash_next(¯os, &i)) 260 p->trace_flags = FLAG_NO_TRACE; 261 } else { 262 p = create_entry(name); 263 p->trace_flags = on; 264 } 265 } 266 267 ndptr 268 macro_getbuiltin(const char *name) 269 { 270 ndptr p; 271 272 p = lookup(name); 273 if (p == NULL || p->builtin_type == MACRTYPE) 274 return NULL; 275 else 276 return p; 277 } 278