| 1 | |
| 2 | /* gmalloc.c - THIS FILE IS AUTOMAGICALLY GENERATED SO DON'T EDIT IT. */ |
| 3 | |
| 4 | /* Single-file skeleton for GNU malloc. |
| 5 | Copyright 1989 Free Software Foundation |
| 6 | Written May 1989 by Mike Haertel. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 1, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | |
| 22 | The author may be reached (Email) at the address mike@ai.mit.edu, |
| 23 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ |
| 24 | |
| 25 | #define __ONEFILE |
| 26 | |
| 27 | /* DO NOT DELETE THIS LINE -- ansidecl.h INSERTED HERE. */ |
| 28 | /* Copyright (C) 1989 Free Software Foundation, Inc. |
| 29 | This file is part of the GNU C Library. |
| 30 | |
| 31 | The GNU C Library is free software; you can redistribute it and/or modify |
| 32 | it under the terms of the GNU General Public License as published by |
| 33 | the Free Software Foundation; either version 1, or (at your option) |
| 34 | any later version. |
| 35 | |
| 36 | The GNU C Library is distributed in the hope that it will be useful, |
| 37 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 38 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 39 | GNU General Public License for more details. |
| 40 | |
| 41 | You should have received a copy of the GNU General Public License |
| 42 | along with the GNU C Library; see the file COPYING. If not, write to |
| 43 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 44 | |
| 45 | /* ANSI and traditional C compatibility macros |
| 46 | |
| 47 | ANSI C is assumed if __STDC__ is #defined. |
| 48 | |
| 49 | Macros |
| 50 | PTR - Generic pointer type |
| 51 | LONG_DOUBLE - `long double' type |
| 52 | CONST - `const' keyword |
| 53 | VOLATILE - `volatile' keyword |
| 54 | SIGNED - `signed' keyword |
| 55 | PTRCONST - Generic const pointer (void *const) |
| 56 | |
| 57 | EXFUN(name, prototype) - declare external function NAME |
| 58 | with prototype PROTOTYPE |
| 59 | DEFUN(name, arglist, args) - define function NAME with |
| 60 | args ARGLIST of types in ARGS |
| 61 | DEFUN_VOID(name) - define function NAME with no args |
| 62 | AND - argument separator for ARGS |
| 63 | NOARGS - null arglist |
| 64 | DOTS - `...' in args |
| 65 | |
| 66 | For example: |
| 67 | extern int EXFUN(printf, (CONST char *format DOTS)); |
| 68 | int DEFUN(fprintf, (stream, format), |
| 69 | FILE *stream AND CONST char *format DOTS) { ... } |
| 70 | void DEFUN_VOID(abort) { ... } |
| 71 | */ |
| 72 | |
| 73 | #ifndef _ANSIDECL_H |
| 74 | |
| 75 | #define _ANSIDECL_H 1 |
| 76 | |
| 77 | |
| 78 | /* Every source file includes this file, |
| 79 | so they will all get the switch for lint. */ |
| 80 | /* LINTLIBRARY */ |
| 81 | |
| 82 | |
| 83 | #ifdef __STDC__ |
| 84 | |
| 85 | #define PTR void * |
| 86 | #define PTRCONST void *CONST |
| 87 | #define LONG_DOUBLE long double |
| 88 | |
| 89 | #define AND , |
| 90 | #define NOARGS void |
| 91 | #define CONST const |
| 92 | #define VOLATILE volatile |
| 93 | #define SIGNED signed |
| 94 | #define DOTS , ... |
| 95 | |
| 96 | #define EXFUN(name, proto) name proto |
| 97 | #define DEFUN(name, arglist, args) name(args) |
| 98 | #define DEFUN_VOID(name) name(NOARGS) |
| 99 | |
| 100 | #else /* Not ANSI C. */ |
| 101 | |
| 102 | #define PTR char * |
| 103 | #define PTRCONST PTR |
| 104 | #define LONG_DOUBLE double |
| 105 | |
| 106 | #define AND ; |
| 107 | #define NOARGS |
| 108 | #define CONST |
| 109 | #define VOLATILE |
| 110 | #define SIGNED |
| 111 | #define DOTS |
| 112 | |
| 113 | #define EXFUN(name, proto) name() |
| 114 | #define DEFUN(name, arglist, args) name arglist args; |
| 115 | #define DEFUN_VOID(name) name() |
| 116 | |
| 117 | #endif /* ANSI C. */ |
| 118 | |
| 119 | |
| 120 | #endif /* ansidecl.h */ |
| 121 | |
| 122 | #ifdef __STDC__ |
| 123 | #include <limits.h> |
| 124 | #else |
| 125 | /* DO NOT DELETE THIS LINE -- limits.h INSERTED HERE. */ |
| 126 | /* Number of bits in a `char'. */ |
| 127 | #define CHAR_BIT 8 |
| 128 | |
| 129 | /* No multibyte characters supported yet. */ |
| 130 | #define MB_LEN_MAX 1 |
| 131 | |
| 132 | /* Minimum and maximum values a `signed char' can hold. */ |
| 133 | #define SCHAR_MIN -128 |
| 134 | #define SCHAR_MAX 127 |
| 135 | |
| 136 | /* Maximum value an `unsigned char' can hold. (Minimum is 0). */ |
| 137 | #define UCHAR_MAX 255U |
| 138 | |
| 139 | /* Minimum and maximum values a `char' can hold. */ |
| 140 | #ifdef __CHAR_UNSIGNED__ |
| 141 | #define CHAR_MIN 0 |
| 142 | #define CHAR_MAX 255U |
| 143 | #else |
| 144 | #define CHAR_MIN -128 |
| 145 | #define CHAR_MAX 127 |
| 146 | #endif |
| 147 | |
| 148 | /* Minimum and maximum values a `signed short int' can hold. */ |
| 149 | #define SHRT_MIN -32768 |
| 150 | #define SHRT_MAX 32767 |
| 151 | |
| 152 | /* Maximum value an `unsigned short int' can hold. (Minimum is 0). */ |
| 153 | #define USHRT_MAX 65535U |
| 154 | |
| 155 | /* Minimum and maximum values a `signed int' can hold. */ |
| 156 | #define INT_MIN -2147483648 |
| 157 | #define INT_MAX 2147483647 |
| 158 | |
| 159 | /* Maximum value an `unsigned int' can hold. (Minimum is 0). */ |
| 160 | #define UINT_MAX 4294967295U |
| 161 | |
| 162 | /* Minimum and maximum values a `signed long int' can hold. |
| 163 | (Same as `int'). */ |
| 164 | #define LONG_MIN (-LONG_MAX-1) |
| 165 | #define LONG_MAX 2147483647 |
| 166 | |
| 167 | /* Maximum value an `unsigned long int' can hold. (Minimum is 0). */ |
| 168 | #define ULONG_MAX 4294967295U |
| 169 | #endif |
| 170 | |
| 171 | #ifdef __STDC__ |
| 172 | #include <stddef.h> |
| 173 | #else |
| 174 | /* DO NOT DELETE THIS LINE -- stddef.h INSERTED HERE. */ |
| 175 | #ifndef _STDDEF_H |
| 176 | #define _STDDEF_H |
| 177 | |
| 178 | /* Signed type of difference of two pointers. */ |
| 179 | |
| 180 | typedef long ptrdiff_t; |
| 181 | |
| 182 | /* Unsigned type of `sizeof' something. */ |
| 183 | |
| 184 | #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */ |
| 185 | #define _SIZE_T |
| 186 | typedef unsigned long size_t; |
| 187 | #endif /* _SIZE_T */ |
| 188 | |
| 189 | /* A null pointer constant. */ |
| 190 | |
| 191 | #undef NULL /* in case <stdio.h> has defined it. */ |
| 192 | #define NULL 0 |
| 193 | |
| 194 | /* Offset of member MEMBER in a struct of type TYPE. */ |
| 195 | |
| 196 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |
| 197 | |
| 198 | #endif /* _STDDEF_H */ |
| 199 | #endif |
| 200 | |
| 201 | /* DO NOT DELETE THIS LINE -- stdlib.h INSERTED HERE. */ |
| 202 | /* Fake stdlib.h supplying the stuff needed by malloc. */ |
| 203 | |
| 204 | #ifndef __ONEFILE |
| 205 | #include <stddef.h> |
| 206 | #endif |
| 207 | |
| 208 | extern void EXFUN(abort, (void)); |
| 209 | extern void EXFUN(free, (PTR)); |
| 210 | extern PTR EXFUN(malloc, (size_t)); |
| 211 | extern PTR EXFUN(realloc, (PTR, size_t)); |
| 212 | |
| 213 | /* DO NOT DELETE THIS LINE -- string.h INSERTED HERE. */ |
| 214 | /* Fake string.h supplying stuff used by malloc. */ |
| 215 | #ifndef __ONEFILE |
| 216 | #include <stddef.h> |
| 217 | #endif |
| 218 | |
| 219 | extern PTR EXFUN(memcpy, (PTR, PTR, size_t)); |
| 220 | extern PTR EXFUN(memset, (PTR, int, size_t)); |
| 221 | #define memmove memcpy |
| 222 | |
| 223 | #define _MALLOC_INTERNAL |
| 224 | /* DO NOT DELETE THIS LINE -- malloc.h INSERTED HERE. */ |
| 225 | /* Declarations for `malloc' and friends. |
| 226 | Copyright 1990 Free Software Foundation |
| 227 | Written May 1989 by Mike Haertel. |
| 228 | |
| 229 | This program is free software; you can redistribute it and/or modify |
| 230 | it under the terms of the GNU General Public License as published by |
| 231 | the Free Software Foundation; either version 1, or (at your option) |
| 232 | any later version. |
| 233 | |
| 234 | This program is distributed in the hope that it will be useful, |
| 235 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 236 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 237 | GNU General Public License for more details. |
| 238 | |
| 239 | You should have received a copy of the GNU General Public License |
| 240 | along with this program; if not, write to the Free Software |
| 241 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 242 | |
| 243 | The author may be reached (Email) at the address mike@@ai.mit.edu, |
| 244 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ |
| 245 | |
| 246 | #ifndef _MALLOC_H |
| 247 | |
| 248 | #define _MALLOC_H 1 |
| 249 | |
| 250 | #ifndef __ONEFILE |
| 251 | #define __need_NULL |
| 252 | #define __need_size_t |
| 253 | #define __need_ptrdiff_t |
| 254 | #include <stddef.h> |
| 255 | #endif |
| 256 | |
| 257 | #ifdef _MALLOC_INTERNAL |
| 258 | |
| 259 | #ifndef __ONEFILE |
| 260 | #include <limits.h> |
| 261 | #endif |
| 262 | |
| 263 | /* The allocator divides the heap into blocks of fixed size; large |
| 264 | requests receive one or more whole blocks, and small requests |
| 265 | receive a fragment of a block. Fragment sizes are powers of two, |
| 266 | and all fragments of a block are the same size. When all the |
| 267 | fragments in a block have been freed, the block itself is freed. */ |
| 268 | #define INT_BIT (CHAR_BIT * sizeof(int)) |
| 269 | #define BLOCKLOG (INT_BIT > 16 ? 12 : 9) |
| 270 | #define BLOCKSIZE (1 << BLOCKLOG) |
| 271 | #define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE) |
| 272 | |
| 273 | /* Determine the amount of memory spanned by the initial heap table |
| 274 | (not an absolute limit). */ |
| 275 | #define HEAP (INT_BIT > 16 ? 4194304 : 65536) |
| 276 | |
| 277 | /* Number of contiguous free blocks allowed to build up at the end of |
| 278 | memory before they will be returned to the system. */ |
| 279 | #define FINAL_FREE_BLOCKS 8 |
| 280 | |
| 281 | /* Where to start searching the free list when looking for new memory. |
| 282 | The two possible values are 0 and _heapindex. Starting at 0 seems |
| 283 | to reduce total memory usage, while starting at _heapindex seems to |
| 284 | run faster. */ |
| 285 | #define MALLOC_SEARCH_START _heapindex |
| 286 | |
| 287 | /* Data structure giving per-block information. */ |
| 288 | typedef union |
| 289 | { |
| 290 | /* Heap information for a busy block. */ |
| 291 | struct |
| 292 | { |
| 293 | /* Zero for a large block, or positive giving the |
| 294 | logarithm to the base two of the fragment size. */ |
| 295 | int type; |
| 296 | union |
| 297 | { |
| 298 | struct |
| 299 | { |
| 300 | size_t nfree; /* Free fragments in a fragmented block. */ |
| 301 | size_t first; /* First free fragment of the block. */ |
| 302 | } frag; |
| 303 | /* Size (in blocks) of a large cluster. */ |
| 304 | size_t size; |
| 305 | } info; |
| 306 | } busy; |
| 307 | /* Heap information for a free block (that may be the first of |
| 308 | a free cluster). */ |
| 309 | struct |
| 310 | { |
| 311 | size_t size; /* Size (in blocks) of a free cluster. */ |
| 312 | size_t next; /* Index of next free cluster. */ |
| 313 | size_t prev; /* Index of previous free cluster. */ |
| 314 | } free; |
| 315 | } malloc_info; |
| 316 | |
| 317 | /* Pointer to first block of the heap. */ |
| 318 | extern char *_heapbase; |
| 319 | |
| 320 | /* Table indexed by block number giving per-block information. */ |
| 321 | extern malloc_info *_heapinfo; |
| 322 | |
| 323 | /* Address to block number and vice versa. */ |
| 324 | #define BLOCK(A) (((char *) (A) - _heapbase) / BLOCKSIZE + 1) |
| 325 | #define ADDRESS(B) ((PTR) (((B) - 1) * BLOCKSIZE + _heapbase)) |
| 326 | |
| 327 | /* Current search index for the heap table. */ |
| 328 | extern size_t _heapindex; |
| 329 | |
| 330 | /* Limit of valid info table indices. */ |
| 331 | extern size_t _heaplimit; |
| 332 | |
| 333 | /* Doubly linked lists of free fragments. */ |
| 334 | struct list |
| 335 | { |
| 336 | struct list *next; |
| 337 | struct list *prev; |
| 338 | }; |
| 339 | |
| 340 | /* Free list headers for each fragment size. */ |
| 341 | extern struct list _fraghead[]; |
| 342 | |
| 343 | /* Instrumentation. */ |
| 344 | extern size_t _chunks_used; |
| 345 | extern size_t _bytes_used; |
| 346 | extern size_t _chunks_free; |
| 347 | extern size_t _bytes_free; |
| 348 | |
| 349 | /* Internal version of free() used in morecore(). */ |
| 350 | extern void EXFUN(__free, (PTR __ptr)); |
| 351 | |
| 352 | #endif /* _MALLOC_INTERNAL. */ |
| 353 | |
| 354 | /* Underlying allocation function; successive calls should |
| 355 | return contiguous pieces of memory. */ |
| 356 | extern PTR EXFUN((*__morecore), (ptrdiff_t __size)); |
| 357 | |
| 358 | /* Default value of previous. */ |
| 359 | extern PTR EXFUN(__default_morecore, (ptrdiff_t __size)); |
| 360 | |
| 361 | /* Flag whether malloc has been called. */ |
| 362 | extern int __malloc_initialized; |
| 363 | |
| 364 | /* Hooks for debugging versions. */ |
| 365 | extern void EXFUN((*__free_hook), (PTR __ptr)); |
| 366 | extern PTR EXFUN((*__malloc_hook), (size_t __size)); |
| 367 | extern PTR EXFUN((*__realloc_hook), (PTR __ptr, size_t __size)); |
| 368 | |
| 369 | /* Activate a standard collection of debugging hooks. */ |
| 370 | extern void EXFUN(mcheck, (void EXFUN((*func), (void)))); |
| 371 | |
| 372 | /* Statistics available to the user. */ |
| 373 | struct mstats |
| 374 | { |
| 375 | size_t bytes_total; /* Total size of the heap. */ |
| 376 | size_t chunks_used; /* Chunks allocated by the user. */ |
| 377 | size_t bytes_used; /* Byte total of user-allocated chunks. */ |
| 378 | size_t chunks_free; /* Chunks in the free list. */ |
| 379 | size_t bytes_free; /* Byte total of chunks in the free list. */ |
| 380 | }; |
| 381 | |
| 382 | /* Pick up the current statistics. */ |
| 383 | extern struct mstats EXFUN(mstats, (NOARGS)); |
| 384 | |
| 385 | #endif /* malloc.h */ |
| 386 | |
| 387 | /* DO NOT DELETE THIS LINE -- free.c INSERTED HERE. */ |
| 388 | /* Free a block of memory allocated by `malloc'. |
| 389 | Copyright 1990 Free Software Foundation |
| 390 | Written May 1989 by Mike Haertel. |
| 391 | |
| 392 | This program is free software; you can redistribute it and/or modify |
| 393 | it under the terms of the GNU General Public License as published by |
| 394 | the Free Software Foundation; either version 1, or (at your option) |
| 395 | any later version. |
| 396 | |
| 397 | This program is distributed in the hope that it will be useful, |
| 398 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 399 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 400 | GNU General Public License for more details. |
| 401 | |
| 402 | You should have received a copy of the GNU General Public License |
| 403 | along with this program; if not, write to the Free Software |
| 404 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 405 | |
| 406 | The author may be reached (Email) at the address mike@ai.mit.edu, |
| 407 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ |
| 408 | |
| 409 | #ifndef __ONEFILE |
| 410 | #include "ansidecl.h" |
| 411 | #include <stddef.h> |
| 412 | #include <stdlib.h> |
| 413 | |
| 414 | #define _MALLOC_INTERNAL |
| 415 | #include "malloc.h" |
| 416 | #endif /* __ONEFILE */ |
| 417 | |
| 418 | /* Debugging hook for free. */ |
| 419 | void EXFUN((*__free_hook), (PTR __ptr)); |
| 420 | |
| 421 | /* Return memory to the heap. Like free() but don't call a __free_hook |
| 422 | if there is one. */ |
| 423 | void |
| 424 | DEFUN(__free, (ptr), PTR ptr) |
| 425 | { |
| 426 | int type; |
| 427 | size_t block, blocks; |
| 428 | register size_t i; |
| 429 | struct list *prev, *next; |
| 430 | |
| 431 | block = BLOCK(ptr); |
| 432 | |
| 433 | type = _heapinfo[block].busy.type; |
| 434 | switch (type) |
| 435 | { |
| 436 | case 0: |
| 437 | /* Get as many statistics as early as we can. */ |
| 438 | --_chunks_used; |
| 439 | _bytes_used -= _heapinfo[block].busy.info.size * BLOCKSIZE; |
| 440 | _bytes_free += _heapinfo[block].busy.info.size * BLOCKSIZE; |
| 441 | |
| 442 | /* Find the free cluster previous to this one in the free list. |
| 443 | Start searching at the last block referenced; this may benefit |
| 444 | programs with locality of allocation. */ |
| 445 | i = _heapindex; |
| 446 | if (i > block) |
| 447 | while (i > block) |
| 448 | i = _heapinfo[i].free.prev; |
| 449 | else |
| 450 | { |
| 451 | do |
| 452 | i = _heapinfo[i].free.next; |
| 453 | while (i > 0 && i < block); |
| 454 | i = _heapinfo[i].free.prev; |
| 455 | } |
| 456 | |
| 457 | /* Determine how to link this block into the free list. */ |
| 458 | if (block == i + _heapinfo[i].free.size) |
| 459 | { |
| 460 | /* Coalesce this block with its predecessor. */ |
| 461 | _heapinfo[i].free.size += _heapinfo[block].busy.info.size; |
| 462 | block = i; |
| 463 | } |
| 464 | else |
| 465 | { |
| 466 | /* Really link this block back into the free list. */ |
| 467 | _heapinfo[block].free.size = _heapinfo[block].busy.info.size; |
| 468 | _heapinfo[block].free.next = _heapinfo[i].free.next; |
| 469 | _heapinfo[block].free.prev = i; |
| 470 | _heapinfo[i].free.next = block; |
| 471 | _heapinfo[_heapinfo[block].free.next].free.prev = block; |
| 472 | ++_chunks_free; |
| 473 | } |
| 474 | |
| 475 | /* Now that the block is linked in, see if we can coalesce it |
| 476 | with its successor (by deleting its successor from the list |
| 477 | and adding in its size). */ |
| 478 | if (block + _heapinfo[block].free.size == _heapinfo[block].free.next) |
| 479 | { |
| 480 | _heapinfo[block].free.size |
| 481 | += _heapinfo[_heapinfo[block].free.next].free.size; |
| 482 | _heapinfo[block].free.next |
| 483 | = _heapinfo[_heapinfo[block].free.next].free.next; |
| 484 | _heapinfo[_heapinfo[block].free.next].free.prev = block; |
| 485 | --_chunks_free; |
| 486 | } |
| 487 | |
| 488 | /* Now see if we can return stuff to the system. */ |
| 489 | blocks = _heapinfo[block].free.size; |
| 490 | if (blocks >= FINAL_FREE_BLOCKS && block + blocks == _heaplimit |
| 491 | && (*__morecore)(0) == ADDRESS(block + blocks)) |
| 492 | { |
| 493 | register size_t bytes = blocks * BLOCKSIZE; |
| 494 | _heaplimit -= blocks; |
| 495 | (*__morecore)(- bytes); |
| 496 | _heapinfo[_heapinfo[block].free.prev].free.next |
| 497 | = _heapinfo[block].free.next; |
| 498 | _heapinfo[_heapinfo[block].free.next].free.prev |
| 499 | = _heapinfo[block].free.prev; |
| 500 | block = _heapinfo[block].free.prev; |
| 501 | --_chunks_free; |
| 502 | _bytes_free -= bytes; |
| 503 | } |
| 504 | |
| 505 | /* Set the next search to begin at this block. */ |
| 506 | _heapindex = block; |
| 507 | break; |
| 508 | |
| 509 | default: |
| 510 | /* Do some of the statistics. */ |
| 511 | --_chunks_used; |
| 512 | _bytes_used -= 1 << type; |
| 513 | ++_chunks_free; |
| 514 | _bytes_free += 1 << type; |
| 515 | |
| 516 | /* Get the address of the first free fragment in this block. */ |
| 517 | prev = (struct list *) ((char *) ADDRESS(block) + |
| 518 | (_heapinfo[block].busy.info.frag.first << type)); |
| 519 | |
| 520 | if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1) |
| 521 | { |
| 522 | /* If all fragments of this block are free, remove them |
| 523 | from the fragment list and free the whole block. */ |
| 524 | next = prev; |
| 525 | for (i = 1; i < BLOCKSIZE >> type; ++i) |
| 526 | next = next->next; |
| 527 | prev->prev->next = next; |
| 528 | if (next != NULL) |
| 529 | next->prev = prev->prev; |
| 530 | _heapinfo[block].busy.type = 0; |
| 531 | _heapinfo[block].busy.info.size = 1; |
| 532 | |
| 533 | /* Keep the statistics accurate. */ |
| 534 | ++_chunks_used; |
| 535 | _bytes_used += BLOCKSIZE; |
| 536 | _chunks_free -= BLOCKSIZE >> type; |
| 537 | _bytes_free -= BLOCKSIZE; |
| 538 | |
| 539 | free(ADDRESS(block)); |
| 540 | } |
| 541 | else if (_heapinfo[block].busy.info.frag.nfree != 0) |
| 542 | { |
| 543 | /* If some fragments of this block are free, link this |
| 544 | fragment into the fragment list after the first free |
| 545 | fragment of this block. */ |
| 546 | next = (struct list *) ptr; |
| 547 | next->next = prev->next; |
| 548 | next->prev = prev; |
| 549 | prev->next = next; |
| 550 | if (next->next != NULL) |
| 551 | next->next->prev = next; |
| 552 | ++_heapinfo[block].busy.info.frag.nfree; |
| 553 | } |
| 554 | else |
| 555 | { |
| 556 | /* No fragments of this block are free, so link this |
| 557 | fragment into the fragment list and announce that |
| 558 | it is the first free fragment of this block. */ |
| 559 | prev = (struct list *) ptr; |
| 560 | _heapinfo[block].busy.info.frag.nfree = 1; |
| 561 | _heapinfo[block].busy.info.frag.first = (unsigned int) |
| 562 | (((char *) ptr - (char *) NULL) % BLOCKSIZE >> type); |
| 563 | prev->next = _fraghead[type].next; |
| 564 | prev->prev = &_fraghead[type]; |
| 565 | prev->prev->next = prev; |
| 566 | if (prev->next != NULL) |
| 567 | prev->next->prev = prev; |
| 568 | } |
| 569 | break; |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | /* Return memory to the heap. */ |
| 574 | void |
| 575 | DEFUN(free, (ptr), PTR ptr) |
| 576 | { |
| 577 | if (ptr == NULL) |
| 578 | return; |
| 579 | |
| 580 | if (__free_hook != NULL) |
| 581 | (*__free_hook)(ptr); |
| 582 | else |
| 583 | __free (ptr); |
| 584 | } |
| 585 | |
| 586 | /* DO NOT DELETE THIS LINE -- malloc.c INSERTED HERE. */ |
| 587 | /* Memory allocator `malloc'. |
| 588 | Copyright 1990 Free Software Foundation |
| 589 | Written May 1989 by Mike Haertel. |
| 590 | |
| 591 | This program is free software; you can redistribute it and/or modify |
| 592 | it under the terms of the GNU General Public License as published by |
| 593 | the Free Software Foundation; either version 1, or (at your option) |
| 594 | any later version. |
| 595 | |
| 596 | This program is distributed in the hope that it will be useful, |
| 597 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 598 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 599 | GNU General Public License for more details. |
| 600 | |
| 601 | You should have received a copy of the GNU General Public License |
| 602 | along with this program; if not, write to the Free Software |
| 603 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 604 | |
| 605 | The author may be reached (Email) at the address mike@ai.mit.edu, |
| 606 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ |
| 607 | |
| 608 | #ifndef __ONEFILE |
| 609 | #include "ansidecl.h" |
| 610 | #include <stddef.h> |
| 611 | #include <stdlib.h> |
| 612 | #include <string.h> |
| 613 | |
| 614 | #define _MALLOC_INTERNAL |
| 615 | #include "malloc.h" |
| 616 | #endif /* __ONEFILE */ |
| 617 | |
| 618 | /* How to really get more memory. */ |
| 619 | PTR EXFUN((*__morecore), (ptrdiff_t __size)) = __default_morecore; |
| 620 | |
| 621 | /* Debugging hook for `malloc'. */ |
| 622 | PTR EXFUN((*__malloc_hook), (size_t __size)); |
| 623 | |
| 624 | /* Pointer to the base of the first block. */ |
| 625 | char *_heapbase; |
| 626 | |
| 627 | /* Block information table. Allocated with align/__free (not malloc/free). */ |
| 628 | malloc_info *_heapinfo; |
| 629 | |
| 630 | /* Number of info entries. */ |
| 631 | static size_t heapsize; |
| 632 | |
| 633 | /* Search index in the info table. */ |
| 634 | size_t _heapindex; |
| 635 | |
| 636 | /* Limit of valid info table indices. */ |
| 637 | size_t _heaplimit; |
| 638 | |
| 639 | /* Free lists for each fragment size. */ |
| 640 | struct list _fraghead[BLOCKLOG]; |
| 641 | |
| 642 | /* Instrumentation. */ |
| 643 | size_t _chunks_used; |
| 644 | size_t _bytes_used; |
| 645 | size_t _chunks_free; |
| 646 | size_t _bytes_free; |
| 647 | |
| 648 | /* Are you experienced? */ |
| 649 | int __malloc_initialized; |
| 650 | |
| 651 | /* Aligned allocation. */ |
| 652 | static PTR |
| 653 | DEFUN(align, (size), size_t size) |
| 654 | { |
| 655 | PTR result; |
| 656 | unsigned int adj; |
| 657 | |
| 658 | result = (*__morecore)(size); |
| 659 | adj = (unsigned int) ((char *) result - (char *) NULL) % BLOCKSIZE; |
| 660 | if (adj != 0) |
| 661 | { |
| 662 | adj = BLOCKSIZE - adj; |
| 663 | (void) (*__morecore)(adj); |
| 664 | result = (char *) result + adj; |
| 665 | } |
| 666 | return result; |
| 667 | } |
| 668 | |
| 669 | /* Set everything up and remember that we have. */ |
| 670 | static int |
| 671 | DEFUN_VOID(initialize) |
| 672 | { |
| 673 | heapsize = HEAP / BLOCKSIZE; |
| 674 | _heapinfo = (malloc_info *) align(heapsize * sizeof(malloc_info)); |
| 675 | if (_heapinfo == NULL) |
| 676 | return 0; |
| 677 | memset(_heapinfo, 0, heapsize * sizeof(malloc_info)); |
| 678 | _heapinfo[0].free.size = 0; |
| 679 | _heapinfo[0].free.next = _heapinfo[0].free.prev = 0; |
| 680 | _heapindex = 0; |
| 681 | _heapbase = (char *) _heapinfo; |
| 682 | __malloc_initialized = 1; |
| 683 | return 1; |
| 684 | } |
| 685 | |
| 686 | /* Get neatly aligned memory, initializing or |
| 687 | growing the heap info table as necessary. */ |
| 688 | static PTR |
| 689 | DEFUN(morecore, (size), size_t size) |
| 690 | { |
| 691 | PTR result; |
| 692 | malloc_info *newinfo, *oldinfo; |
| 693 | size_t newsize; |
| 694 | |
| 695 | result = align(size); |
| 696 | if (result == NULL) |
| 697 | return NULL; |
| 698 | |
| 699 | /* Check if we need to grow the info table. */ |
| 700 | if (BLOCK((char *) result + size) > heapsize) |
| 701 | { |
| 702 | newsize = heapsize; |
| 703 | while (BLOCK((char *) result + size) > newsize) |
| 704 | newsize *= 2; |
| 705 | newinfo = (malloc_info *) align(newsize * sizeof(malloc_info)); |
| 706 | if (newinfo == NULL) |
| 707 | { |
| 708 | (*__morecore)(- size); |
| 709 | return NULL; |
| 710 | } |
| 711 | memset(newinfo, 0, newsize * sizeof(malloc_info)); |
| 712 | memcpy(newinfo, _heapinfo, heapsize * sizeof(malloc_info)); |
| 713 | oldinfo = _heapinfo; |
| 714 | newinfo[BLOCK(oldinfo)].busy.type = 0; |
| 715 | newinfo[BLOCK(oldinfo)].busy.info.size |
| 716 | = BLOCKIFY(heapsize * sizeof(malloc_info)); |
| 717 | _heapinfo = newinfo; |
| 718 | __free(oldinfo); |
| 719 | heapsize = newsize; |
| 720 | } |
| 721 | |
| 722 | _heaplimit = BLOCK((char *) result + size); |
| 723 | return result; |
| 724 | } |
| 725 | |
| 726 | /* Allocate memory from the heap. */ |
| 727 | PTR |
| 728 | DEFUN(malloc, (size), size_t size) |
| 729 | { |
| 730 | PTR result; |
| 731 | size_t block, blocks, lastblocks, start; |
| 732 | register size_t i; |
| 733 | struct list *next; |
| 734 | |
| 735 | if (size == 0) |
| 736 | return NULL; |
| 737 | |
| 738 | if (__malloc_hook != NULL) |
| 739 | return (*__malloc_hook)(size); |
| 740 | |
| 741 | if (!__malloc_initialized) |
| 742 | if (!initialize()) |
| 743 | return NULL; |
| 744 | |
| 745 | if (size < sizeof(struct list)) |
| 746 | size = sizeof(struct list); |
| 747 | |
| 748 | /* Determine the allocation policy based on the request size. */ |
| 749 | if (size <= BLOCKSIZE / 2) |
| 750 | { |
| 751 | /* Small allocation to receive a fragment of a block. |
| 752 | Determine the logarithm to base two of the fragment size. */ |
| 753 | register size_t log = 1; |
| 754 | --size; |
| 755 | while ((size /= 2) != 0) |
| 756 | ++log; |
| 757 | |
| 758 | /* Look in the fragment lists for a |
| 759 | free fragment of the desired size. */ |
| 760 | next = _fraghead[log].next; |
| 761 | if (next != NULL) |
| 762 | { |
| 763 | /* There are free fragments of this size. |
| 764 | Pop a fragment out of the fragment list and return it. |
| 765 | Update the block's nfree and first counters. */ |
| 766 | result = (PTR) next; |
| 767 | next->prev->next = next->next; |
| 768 | if (next->next != NULL) |
| 769 | next->next->prev = next->prev; |
| 770 | block = BLOCK(result); |
| 771 | if (--_heapinfo[block].busy.info.frag.nfree != 0) |
| 772 | _heapinfo[block].busy.info.frag.first = (unsigned int) |
| 773 | (((char *) next->next - (char *) NULL) % BLOCKSIZE) >> log; |
| 774 | |
| 775 | /* Update the statistics. */ |
| 776 | ++_chunks_used; |
| 777 | _bytes_used += 1 << log; |
| 778 | --_chunks_free; |
| 779 | _bytes_free -= 1 << log; |
| 780 | } |
| 781 | else |
| 782 | { |
| 783 | /* No free fragments of the desired size, so get a new block |
| 784 | and break it into fragments, returning the first. */ |
| 785 | result = malloc(BLOCKSIZE); |
| 786 | if (result == NULL) |
| 787 | return NULL; |
| 788 | |
| 789 | /* Link all fragments but the first into the free list. */ |
| 790 | for (i = 1; i < BLOCKSIZE >> log; ++i) |
| 791 | { |
| 792 | next = (struct list *) ((char *) result + (i << log)); |
| 793 | next->next = _fraghead[log].next; |
| 794 | next->prev = &_fraghead[log]; |
| 795 | next->prev->next = next; |
| 796 | if (next->next != NULL) |
| 797 | next->next->prev = next; |
| 798 | } |
| 799 | |
| 800 | /* Initialize the nfree and first counters for this block. */ |
| 801 | block = BLOCK(result); |
| 802 | _heapinfo[block].busy.type = log; |
| 803 | _heapinfo[block].busy.info.frag.nfree = i - 1; |
| 804 | _heapinfo[block].busy.info.frag.first = i - 1; |
| 805 | |
| 806 | _chunks_free += (BLOCKSIZE >> log) - 1; |
| 807 | _bytes_free += BLOCKSIZE - (1 << log); |
| 808 | } |
| 809 | } |
| 810 | else |
| 811 | { |
| 812 | /* Large allocation to receive one or more blocks. |
| 813 | Search the free list in a circle starting at the last place visited. |
| 814 | If we loop completely around without finding a large enough |
| 815 | space we will have to get more memory from the system. */ |
| 816 | blocks = BLOCKIFY(size); |
| 817 | start = block = MALLOC_SEARCH_START; |
| 818 | while (_heapinfo[block].free.size < blocks) |
| 819 | { |
| 820 | block = _heapinfo[block].free.next; |
| 821 | if (block == start) |
| 822 | { |
| 823 | /* Need to get more from the system. Check to see if |
| 824 | the new core will be contiguous with the final free |
| 825 | block; if so we don't need to get as much. */ |
| 826 | block = _heapinfo[0].free.prev; |
| 827 | lastblocks = _heapinfo[block].free.size; |
| 828 | if (_heaplimit != 0 && block + lastblocks == _heaplimit && |
| 829 | (*__morecore)(0) == ADDRESS(block + lastblocks) && |
| 830 | (morecore((blocks - lastblocks) * BLOCKSIZE)) != NULL) |
| 831 | { |
| 832 | _heapinfo[block].free.size = blocks; |
| 833 | _bytes_free += (blocks - lastblocks) * BLOCKSIZE; |
| 834 | continue; |
| 835 | } |
| 836 | result = morecore(blocks * BLOCKSIZE); |
| 837 | if (result == NULL) |
| 838 | return NULL; |
| 839 | block = BLOCK(result); |
| 840 | _heapinfo[block].busy.type = 0; |
| 841 | _heapinfo[block].busy.info.size = blocks; |
| 842 | ++_chunks_used; |
| 843 | _bytes_used += blocks * BLOCKSIZE; |
| 844 | return result; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | /* At this point we have found a suitable free list entry. |
| 849 | Figure out how to remove what we need from the list. */ |
| 850 | result = ADDRESS(block); |
| 851 | if (_heapinfo[block].free.size > blocks) |
| 852 | { |
| 853 | /* The block we found has a bit left over, |
| 854 | so relink the tail end back into the free list. */ |
| 855 | _heapinfo[block + blocks].free.size |
| 856 | = _heapinfo[block].free.size - blocks; |
| 857 | _heapinfo[block + blocks].free.next |
| 858 | = _heapinfo[block].free.next; |
| 859 | _heapinfo[block + blocks].free.prev |
| 860 | = _heapinfo[block].free.prev; |
| 861 | _heapinfo[_heapinfo[block].free.prev].free.next |
| 862 | = _heapinfo[_heapinfo[block].free.next].free.prev |
| 863 | = _heapindex = block + blocks; |
| 864 | } |
| 865 | else |
| 866 | { |
| 867 | /* The block exactly matches our requirements, |
| 868 | so just remove it from the list. */ |
| 869 | _heapinfo[_heapinfo[block].free.next].free.prev |
| 870 | = _heapinfo[block].free.prev; |
| 871 | _heapinfo[_heapinfo[block].free.prev].free.next |
| 872 | = _heapindex = _heapinfo[block].free.next; |
| 873 | --_chunks_free; |
| 874 | } |
| 875 | |
| 876 | _heapinfo[block].busy.type = 0; |
| 877 | _heapinfo[block].busy.info.size = blocks; |
| 878 | ++_chunks_used; |
| 879 | _bytes_used += blocks * BLOCKSIZE; |
| 880 | _bytes_free -= blocks * BLOCKSIZE; |
| 881 | } |
| 882 | |
| 883 | return result; |
| 884 | } |
| 885 | |
| 886 | /* DO NOT DELETE THIS LINE -- realloc.c INSERTED HERE. */ |
| 887 | /* Change the size of a block allocated by `malloc'. |
| 888 | Copyright 1990 Free Software Foundation |
| 889 | Written May 1989 by Mike Haertel. |
| 890 | |
| 891 | This program is free software; you can redistribute it and/or modify |
| 892 | it under the terms of the GNU General Public License as published by |
| 893 | the Free Software Foundation; either version 1, or (at your option) |
| 894 | any later version. |
| 895 | |
| 896 | This program is distributed in the hope that it will be useful, |
| 897 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 898 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 899 | GNU General Public License for more details. |
| 900 | |
| 901 | You should have received a copy of the GNU General Public License |
| 902 | along with this program; if not, write to the Free Software |
| 903 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 904 | |
| 905 | The author may be reached (Email) at the address mike@ai.mit.edu, |
| 906 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ |
| 907 | |
| 908 | #ifndef __ONEFILE |
| 909 | #include "ansidecl.h" |
| 910 | #include <stdlib.h> |
| 911 | #include <string.h> |
| 912 | |
| 913 | #define _MALLOC_INTERNAL |
| 914 | #include "malloc.h" |
| 915 | #endif /* __ONEFILE */ |
| 916 | |
| 917 | #define MIN(A, B) ((A) < (B) ? (A) : (B)) |
| 918 | |
| 919 | /* Debugging hook for realloc. */ |
| 920 | PTR EXFUN((*__realloc_hook), (PTR __ptr, size_t __size)); |
| 921 | |
| 922 | /* Resize the given region to the new size, returning a pointer |
| 923 | to the (possibly moved) region. This is optimized for speed; |
| 924 | some benchmarks seem to indicate that greater compactness is |
| 925 | achieved by unconditionally allocating and copying to a |
| 926 | new region. This module has incestuous knowledge of the |
| 927 | internals of both free and malloc. */ |
| 928 | PTR |
| 929 | DEFUN(realloc, (ptr, size), PTR ptr AND size_t size) |
| 930 | { |
| 931 | PTR result; |
| 932 | int type; |
| 933 | size_t block, blocks, oldlimit; |
| 934 | |
| 935 | if (size == 0) |
| 936 | { |
| 937 | free(ptr); |
| 938 | return NULL; |
| 939 | } |
| 940 | else if (ptr == NULL) |
| 941 | return malloc(size); |
| 942 | |
| 943 | if (__realloc_hook != NULL) |
| 944 | return (*__realloc_hook)(ptr, size); |
| 945 | |
| 946 | block = BLOCK(ptr); |
| 947 | |
| 948 | type = _heapinfo[block].busy.type; |
| 949 | switch (type) |
| 950 | { |
| 951 | case 0: |
| 952 | /* Maybe reallocate a large block to a small fragment. */ |
| 953 | if (size <= BLOCKSIZE / 2) |
| 954 | { |
| 955 | result = malloc(size); |
| 956 | if (result != NULL) |
| 957 | { |
| 958 | memcpy(result, ptr, size); |
| 959 | free(ptr); |
| 960 | return result; |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | /* The new size is a large allocation as well; |
| 965 | see if we can hold it in place. */ |
| 966 | blocks = BLOCKIFY(size); |
| 967 | if (blocks < _heapinfo[block].busy.info.size) |
| 968 | { |
| 969 | /* The new size is smaller; return |
| 970 | excess memory to the free list. */ |
| 971 | _heapinfo[block + blocks].busy.type = 0; |
| 972 | _heapinfo[block + blocks].busy.info.size |
| 973 | = _heapinfo[block].busy.info.size - blocks; |
| 974 | _heapinfo[block].busy.info.size = blocks; |
| 975 | free(ADDRESS(block + blocks)); |
| 976 | result = ptr; |
| 977 | } |
| 978 | else if (blocks == _heapinfo[block].busy.info.size) |
| 979 | /* No size change necessary. */ |
| 980 | result = ptr; |
| 981 | else |
| 982 | { |
| 983 | /* Won't fit, so allocate a new region that will. |
| 984 | Free the old region first in case there is sufficient |
| 985 | adjacent free space to grow without moving. */ |
| 986 | blocks = _heapinfo[block].busy.info.size; |
| 987 | /* Prevent free from actually returning memory to the system. */ |
| 988 | oldlimit = _heaplimit; |
| 989 | _heaplimit = 0; |
| 990 | free(ptr); |
| 991 | _heaplimit = oldlimit; |
| 992 | result = malloc(size); |
| 993 | if (result == NULL) |
| 994 | { |
| 995 | (void) malloc(blocks * BLOCKSIZE); |
| 996 | return NULL; |
| 997 | } |
| 998 | if (ptr != result) |
| 999 | memmove(result, ptr, blocks * BLOCKSIZE); |
| 1000 | } |
| 1001 | break; |
| 1002 | |
| 1003 | default: |
| 1004 | /* Old size is a fragment; type is logarithm |
| 1005 | to base two of the fragment size. */ |
| 1006 | if (size > 1 << (type - 1) && size <= 1 << type) |
| 1007 | /* The new size is the same kind of fragment. */ |
| 1008 | result = ptr; |
| 1009 | else |
| 1010 | { |
| 1011 | /* The new size is different; allocate a new space, |
| 1012 | and copy the lesser of the new size and the old. */ |
| 1013 | result = malloc(size); |
| 1014 | if (result == NULL) |
| 1015 | return NULL; |
| 1016 | memcpy(result, ptr, MIN(size, 1 << type)); |
| 1017 | free(ptr); |
| 1018 | } |
| 1019 | break; |
| 1020 | } |
| 1021 | |
| 1022 | return result; |
| 1023 | } |
| 1024 | |
| 1025 | /* DO NOT DELETE THIS LINE -- unix.c INSERTED HERE. */ |
| 1026 | /* unix.c - get more memory with a UNIX system call. |
| 1027 | Copyright 1990 Free Software Foundation |
| 1028 | Written May 1989 by Mike Haertel. |
| 1029 | |
| 1030 | This program is free software; you can redistribute it and/or modify |
| 1031 | it under the terms of the GNU General Public License as published by |
| 1032 | the Free Software Foundation; either version 1, or (at your option) |
| 1033 | any later version. |
| 1034 | |
| 1035 | This program is distributed in the hope that it will be useful, |
| 1036 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 1037 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 1038 | GNU General Public License for more details. |
| 1039 | |
| 1040 | You should have received a copy of the GNU General Public License |
| 1041 | along with this program; if not, write to the Free Software |
| 1042 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 1043 | |
| 1044 | The author may be reached (Email) at the address mike@ai.mit.edu, |
| 1045 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ |
| 1046 | |
| 1047 | #ifndef __ONEFILE |
| 1048 | #include "ansidecl.h" |
| 1049 | #include <stddef.h> |
| 1050 | |
| 1051 | #define _MALLOC_INTERNAL |
| 1052 | #include "malloc.h" |
| 1053 | #endif /* __ONEFILE */ |
| 1054 | |
| 1055 | extern PTR EXFUN(sbrk, (ptrdiff_t size)); |
| 1056 | |
| 1057 | PTR |
| 1058 | DEFUN(__default_morecore, (size), ptrdiff_t size) |
| 1059 | { |
| 1060 | PTR result; |
| 1061 | |
| 1062 | result = sbrk(size); |
| 1063 | if (result == (PTR) -1) |
| 1064 | return NULL; |
| 1065 | return result; |
| 1066 | } |
| 1067 | |
| 1068 | #define __getpagesize getpagesize |
| 1069 | /* DO NOT DELETE THIS LINE -- valloc.c INSERTED HERE. */ |
| 1070 | /* Allocate memory on a page boundary. |
| 1071 | Copyright 1990 Free Software Foundation |
| 1072 | Written May 1989 by Mike Haertel. |
| 1073 | |
| 1074 | This program is free software; you can redistribute it and/or modify |
| 1075 | it under the terms of the GNU General Public License as published by |
| 1076 | the Free Software Foundation; either version 1, or (at your option) |
| 1077 | any later version. |
| 1078 | |
| 1079 | This program is distributed in the hope that it will be useful, |
| 1080 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 1081 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 1082 | GNU General Public License for more details. |
| 1083 | |
| 1084 | You should have received a copy of the GNU General Public License |
| 1085 | along with this program; if not, write to the Free Software |
| 1086 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 1087 | |
| 1088 | The author may be reached (Email) at the address mike@ai.mit.edu, |
| 1089 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ |
| 1090 | |
| 1091 | #ifndef __ONEFILE |
| 1092 | #include "ansidecl.h" |
| 1093 | #include <stdlib.h> |
| 1094 | #endif /* __ONEFILE */ |
| 1095 | |
| 1096 | extern size_t EXFUN(__getpagesize, (NOARGS)); |
| 1097 | |
| 1098 | static size_t pagesize; |
| 1099 | |
| 1100 | PTR |
| 1101 | DEFUN(valloc, (size), size_t size) |
| 1102 | { |
| 1103 | PTR result; |
| 1104 | unsigned int adj; |
| 1105 | |
| 1106 | if (pagesize == 0) |
| 1107 | pagesize = __getpagesize(); |
| 1108 | |
| 1109 | result = malloc(size + pagesize); |
| 1110 | if (result == NULL) |
| 1111 | return NULL; |
| 1112 | adj = (unsigned int) ((char *) result - (char *) NULL) % pagesize; |
| 1113 | if (adj != 0) |
| 1114 | result = (char *) result + pagesize - adj; |
| 1115 | return result; |
| 1116 | } |