| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: utils.c,v 1.3 1997/08/20 16:25:37 mdw Exp $ |
| 4 | * |
| 5 | * Miscellaneous useful bits of code. |
| 6 | * |
| 7 | * (c) 1997 Mark Wooding |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of `become' |
| 13 | * |
| 14 | * `Become' is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * `Become' is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with `become'; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Revision history --------------------------------------------------* |
| 30 | * |
| 31 | * $Log: utils.c,v $ |
| 32 | * Revision 1.3 1997/08/20 16:25:37 mdw |
| 33 | * Add some simple `malloc' tracking. |
| 34 | * |
| 35 | * Revision 1.2 1997/08/04 10:24:26 mdw |
| 36 | * Sources placed under CVS control. |
| 37 | * |
| 38 | * Revision 1.1 1997/07/21 13:47:42 mdw |
| 39 | * Initial revision |
| 40 | * |
| 41 | */ |
| 42 | |
| 43 | /*----- Header files ------------------------------------------------------*/ |
| 44 | |
| 45 | /* --- ANSI headers --- */ |
| 46 | |
| 47 | #include <ctype.h> |
| 48 | #include <stdarg.h> |
| 49 | #include <stdio.h> |
| 50 | #include <stdlib.h> |
| 51 | #include <string.h> |
| 52 | |
| 53 | /* --- Local headers --- */ |
| 54 | |
| 55 | #include "config.h" |
| 56 | #include "utils.h" |
| 57 | |
| 58 | /*----- Program name handling ---------------------------------------------*/ |
| 59 | |
| 60 | /* --- Static data --- */ |
| 61 | |
| 62 | static const char *myname = 0; /* What's my name? */ |
| 63 | |
| 64 | /* --- @quis@ --- * |
| 65 | * |
| 66 | * Arguments: --- |
| 67 | * |
| 68 | * Returns: Pointer to the program name. |
| 69 | * |
| 70 | * Use: Returns the program name. |
| 71 | */ |
| 72 | |
| 73 | const char *quis(void) |
| 74 | { |
| 75 | return (myname); |
| 76 | } |
| 77 | |
| 78 | /* --- @ego@ --- * |
| 79 | * |
| 80 | * Arguments: @const char *p@ = pointer to program name |
| 81 | * |
| 82 | * Returns: --- |
| 83 | * |
| 84 | * Use: Tells the utils library what the program's name is. |
| 85 | */ |
| 86 | |
| 87 | #ifndef PATHSEP |
| 88 | # if defined(__riscos) |
| 89 | # define PATHSEP '.' |
| 90 | # elif defined(__unix) || defined(unix) |
| 91 | # define PATHSEP '/' |
| 92 | # else |
| 93 | # define PATHSEP '\\' |
| 94 | # endif |
| 95 | #endif |
| 96 | |
| 97 | void ego(const char *p) |
| 98 | { |
| 99 | const char *q = p; |
| 100 | while (*q) { |
| 101 | if (*q++ == PATHSEP) |
| 102 | p = q; |
| 103 | } |
| 104 | myname = p; |
| 105 | } |
| 106 | |
| 107 | /*----- Error reporting ---------------------------------------------------*/ |
| 108 | |
| 109 | /* --- @moan@ --- * |
| 110 | * |
| 111 | * Arguments: @const char *f@ = a @printf@-style format string |
| 112 | * @...@ = other arguments |
| 113 | * |
| 114 | * Returns: --- |
| 115 | * |
| 116 | * Use: Reports an error. |
| 117 | */ |
| 118 | |
| 119 | void moan(const char *f, ...) |
| 120 | { |
| 121 | va_list ap; |
| 122 | va_start(ap, f); |
| 123 | fprintf(stderr, "%s: ", myname); |
| 124 | vfprintf(stderr, f, ap); |
| 125 | va_end(ap); |
| 126 | putc('\n', stderr); |
| 127 | } |
| 128 | |
| 129 | /* --- @die@ --- * |
| 130 | * |
| 131 | * Arguments: @const char *f@ = a @printf@-style format string |
| 132 | * @...@ = other arguments |
| 133 | * |
| 134 | * Returns: Never. |
| 135 | * |
| 136 | * Use: Reports an error and hari-kiris. Like @moan@ above, only |
| 137 | * more permanent. |
| 138 | */ |
| 139 | |
| 140 | void die(const char *f, ...) |
| 141 | { |
| 142 | va_list ap; |
| 143 | va_start(ap, f); |
| 144 | fprintf(stderr, "%s: ", myname); |
| 145 | vfprintf(stderr, f, ap); |
| 146 | va_end(ap); |
| 147 | putc('\n', stderr); |
| 148 | exit(EXIT_FAILURE); |
| 149 | } |
| 150 | |
| 151 | /*----- Trace messages ----------------------------------------------------*/ |
| 152 | |
| 153 | #if defined(TRACING) || !defined(NDEBUG) |
| 154 | |
| 155 | /* --- Static data --- */ |
| 156 | |
| 157 | static FILE *tracefp = 0; /* Where does debugging go? */ |
| 158 | static unsigned int tracelvl = 0; /* How much tracing gets done? */ |
| 159 | |
| 160 | /* --- @trace@ --- * |
| 161 | * |
| 162 | * Arguments: @unsigned int lvl@ = trace level for output |
| 163 | * @const char *f@ = a @printf@-style format string |
| 164 | * @...@ = other arguments |
| 165 | * |
| 166 | * Returns: --- |
| 167 | * |
| 168 | * Use: Reports a message to the trace output. |
| 169 | */ |
| 170 | |
| 171 | void trace(unsigned int lvl, const char *f, ...) |
| 172 | { |
| 173 | va_list ap; |
| 174 | if ((lvl & tracing()) == 0) |
| 175 | return; |
| 176 | va_start(ap, f); |
| 177 | fprintf(tracefp, "*** %s: ", myname); |
| 178 | vfprintf(tracefp, f, ap); |
| 179 | va_end(ap); |
| 180 | putc('\n', tracefp); |
| 181 | } |
| 182 | |
| 183 | /* --- @traceblk@ --- * |
| 184 | * |
| 185 | * Arguments: @unsigned int lvl@ = trace level for output |
| 186 | * @const char *hdr@ = some header string to write |
| 187 | * @const void *blk@ = pointer to a block of memory to dump |
| 188 | * @size_t sz@ = size of the block of memory |
| 189 | * |
| 190 | * Returns: --- |
| 191 | * |
| 192 | * Use: Dumps the contents of a block to the trace output. |
| 193 | */ |
| 194 | |
| 195 | void traceblk(unsigned int lvl, const char *hdr, const void *blk, size_t sz) |
| 196 | { |
| 197 | const unsigned char *p = blk; |
| 198 | size_t i; |
| 199 | unsigned long o = 0; |
| 200 | size_t c; |
| 201 | |
| 202 | /* --- Skip if the trace level is too high --- */ |
| 203 | |
| 204 | if ((lvl & tracing()) == 0) |
| 205 | return; |
| 206 | |
| 207 | /* --- Now start work --- */ |
| 208 | |
| 209 | fprintf(tracefp, "*** %s: %s\n", myname, hdr); |
| 210 | |
| 211 | while (sz) { |
| 212 | fprintf(tracefp, "*** %s: %08lu : ", myname, o); |
| 213 | for (i = 0; i < 8; i++) { |
| 214 | if (i < sz) |
| 215 | fprintf(tracefp, "%02x ", p[i]); |
| 216 | else |
| 217 | fputs("** ", tracefp); |
| 218 | } |
| 219 | fputs(": ", tracefp); |
| 220 | for (i = 0; i < 8; i++) { |
| 221 | if (i < sz) |
| 222 | fputc(isprint(p[i]) ? p[i] : '.', tracefp); |
| 223 | else |
| 224 | fputc('*', tracefp); |
| 225 | } |
| 226 | fputc('\n', tracefp); |
| 227 | c = (sz >= 8) ? 8 : sz; |
| 228 | sz -= c, p += c, o += c; |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | |
| 233 | /* --- @traceon@ --- * |
| 234 | * |
| 235 | * Arguments: @FILE *fp@ = a file to trace on |
| 236 | * @unsigned int lvl@ = trace level to set |
| 237 | * |
| 238 | * Returns: --- |
| 239 | * |
| 240 | * Use: Enables tracing to a file. |
| 241 | */ |
| 242 | |
| 243 | void traceon(FILE *fp, unsigned int lvl) |
| 244 | { |
| 245 | tracefp = fp; |
| 246 | if (!tracelvl) |
| 247 | tracelvl = lvl; |
| 248 | } |
| 249 | |
| 250 | /* --- @tracesetlvl@ --- * |
| 251 | * |
| 252 | * Arguments: @unsigned int lvl@ = trace level to set |
| 253 | * |
| 254 | * Returns: --- |
| 255 | * |
| 256 | * Use: Sets the tracing level. |
| 257 | */ |
| 258 | |
| 259 | void tracesetlvl(unsigned int lvl) { tracelvl = lvl; } |
| 260 | |
| 261 | /* --- @tracing@ --- * |
| 262 | * |
| 263 | * Arguments: --- |
| 264 | * |
| 265 | * Returns: Zero if not tracing, tracing level if tracing. |
| 266 | * |
| 267 | * Use: Informs the caller whether tracing is enabled. |
| 268 | */ |
| 269 | |
| 270 | unsigned int tracing(void) { return (tracefp ? tracelvl : 0u); } |
| 271 | |
| 272 | #endif |
| 273 | |
| 274 | /*----- Memory management functions ---------------------------------------*/ |
| 275 | |
| 276 | /* --- @xmalloc@ --- * |
| 277 | * |
| 278 | * Arguments: @size_t sz@ = size of block to allocate |
| 279 | * |
| 280 | * Returns: Pointer to allocated block. |
| 281 | * |
| 282 | * Use: Allocates memory. If the memory isn't available, we don't |
| 283 | * hang aroung long enough for a normal function return. |
| 284 | */ |
| 285 | |
| 286 | void *xmalloc(size_t sz) |
| 287 | { |
| 288 | void *p = malloc(sz); |
| 289 | if (!p) |
| 290 | die("not enough memory"); |
| 291 | return (p); |
| 292 | } |
| 293 | |
| 294 | /* --- @xstrdup@ --- * |
| 295 | * |
| 296 | * Arguments: @const char *s@ = pointer to a string |
| 297 | * |
| 298 | * Returns: Pointer to a copy of the string. |
| 299 | * |
| 300 | * Use: Copies a string (like @strdup@ would, if it existed). |
| 301 | */ |
| 302 | |
| 303 | char *xstrdup(const char *s) |
| 304 | { |
| 305 | size_t sz = strlen(s) + 1; |
| 306 | char *p = xmalloc(sz); |
| 307 | memcpy(p, s, sz); |
| 308 | return (p); |
| 309 | } |
| 310 | |
| 311 | /* --- @xrealloc@ --- * |
| 312 | * |
| 313 | * Arguments: @void *p@ = pointer to a block of memory |
| 314 | * @size_t sz@ = new size desired for the block |
| 315 | * |
| 316 | * Returns: Pointer to the resized memory block (which is almost |
| 317 | * certainly not in the same place any more). |
| 318 | * |
| 319 | * Use: Resizes a memory block. |
| 320 | */ |
| 321 | |
| 322 | void *xrealloc(void *p, size_t sz) |
| 323 | { |
| 324 | p = realloc(p, sz); |
| 325 | if (!p) |
| 326 | die("not enough memory"); |
| 327 | return (p); |
| 328 | } |
| 329 | |
| 330 | /*----- Simple memory use tracking ----------------------------------------*/ |
| 331 | |
| 332 | #ifdef TRACK_MALLOC |
| 333 | |
| 334 | /*#define TRACK_VERBOSE*/ |
| 335 | |
| 336 | /* --- A type to record a size and have a nice alignment --- */ |
| 337 | |
| 338 | typedef union szblock { |
| 339 | struct { |
| 340 | union szblock *next; |
| 341 | union szblock *prev; |
| 342 | size_t sz; |
| 343 | } x; |
| 344 | long double _ld; |
| 345 | void *_p; |
| 346 | } szblock; |
| 347 | |
| 348 | /* --- Static data --- */ |
| 349 | |
| 350 | static unsigned int memused = 0; |
| 351 | static szblock *memlist; |
| 352 | |
| 353 | /* --- @track_malloc@ --- * |
| 354 | * |
| 355 | * Arguments: @size_t sz@ = size requested |
| 356 | * |
| 357 | * Returns: Pointer to allocated space, or null |
| 358 | * |
| 359 | * Use: Allocates memory, and tracks how much is allocated. |
| 360 | */ |
| 361 | |
| 362 | void *track_malloc(size_t sz) |
| 363 | { |
| 364 | szblock *q = (malloc)(sz + sizeof(szblock)); |
| 365 | if (q) { |
| 366 | memused += sz; |
| 367 | #ifdef TRACK_VERBOSE |
| 368 | printf("[%p] allocated %lu\n", (void *)(q + 1), (unsigned long)sz); |
| 369 | #endif |
| 370 | q->x.sz = sz; |
| 371 | q->x.next = memlist; |
| 372 | q->x.prev = 0; |
| 373 | if (q->x.next) |
| 374 | q->x.next->x.prev = q; |
| 375 | memlist = q; |
| 376 | return (q + 1); |
| 377 | } |
| 378 | return (0); |
| 379 | } |
| 380 | |
| 381 | /* --- @track_free@ --- * |
| 382 | * |
| 383 | * Arguments: @void *p@ = pointer to an allocated block |
| 384 | * |
| 385 | * Returns: --- |
| 386 | * |
| 387 | * Use: Frees memory, and tracks how much is still allocated. |
| 388 | */ |
| 389 | |
| 390 | void track_free(void *p) |
| 391 | { |
| 392 | szblock *q; |
| 393 | |
| 394 | if (!p) |
| 395 | return; |
| 396 | q = (szblock *)p - 1; |
| 397 | #ifdef TRACK_VERBOSE |
| 398 | printf("[%p] freed %lu\n", (void *)(q + 1), (unsigned long)q->x.sz); |
| 399 | #endif |
| 400 | if (q->x.next) |
| 401 | q->x.next->x.prev = q->x.prev; |
| 402 | if (q->x.prev) |
| 403 | q->x.prev->x.next = q->x.next; |
| 404 | else |
| 405 | memlist = q->x.next; |
| 406 | memused -= q->x.sz; |
| 407 | (free)(q); |
| 408 | } |
| 409 | |
| 410 | /* --- @track_realloc@ --- * |
| 411 | * |
| 412 | * Arguments: @void *p@ = pointer to an allocated block |
| 413 | * @size_t sz@ = how big it wants to be |
| 414 | * |
| 415 | * Returns: Pointer to the new block. |
| 416 | * |
| 417 | * Use: Reallocates a block, tracking how much memory is still |
| 418 | * available. |
| 419 | */ |
| 420 | |
| 421 | void *track_realloc(void *p, size_t sz) |
| 422 | { |
| 423 | size_t osz; |
| 424 | szblock *q, *qq; |
| 425 | if (p) { |
| 426 | q = (szblock *)p - 1; |
| 427 | osz = q->x.sz; |
| 428 | if (q->x.next) |
| 429 | q->x.next->x.prev = q->x.prev; |
| 430 | if (q->x.prev) |
| 431 | q->x.prev->x.next = q->x.next; |
| 432 | else |
| 433 | memlist = q->x.next; |
| 434 | } else { |
| 435 | q = 0; |
| 436 | osz = 0; |
| 437 | } |
| 438 | qq = (realloc)(q, sz + sizeof(szblock)); |
| 439 | if (qq) { |
| 440 | #ifdef TRACK_VERBOSE |
| 441 | printf("[%p->%p] reallocated %lu -> %lu\n", |
| 442 | (void *)(q + 1), (void *)(qq + 1), |
| 443 | (unsigned long)osz, (unsigned long)sz); |
| 444 | #endif |
| 445 | qq->x.sz = sz; |
| 446 | qq->x.next = memlist; |
| 447 | qq->x.prev = 0; |
| 448 | if (qq->x.next) |
| 449 | qq->x.next->x.prev = qq; |
| 450 | memlist = qq; |
| 451 | memused += sz - osz; |
| 452 | qq->x.sz = sz; |
| 453 | return (qq + 1); |
| 454 | } |
| 455 | return (0); |
| 456 | } |
| 457 | |
| 458 | /* --- @track_memused@ --- * |
| 459 | * |
| 460 | * Arguments: --- |
| 461 | * |
| 462 | * Returns: A count of how much memory is used currently. |
| 463 | * |
| 464 | * Use: Returns the amount of memory which the @track_@-functions |
| 465 | * above have counted as being currently allocated. |
| 466 | */ |
| 467 | |
| 468 | unsigned long track_memused(void) |
| 469 | { |
| 470 | return (memused); |
| 471 | } |
| 472 | |
| 473 | /* --- @track_memlist@ --- * |
| 474 | * |
| 475 | * Arguments: --- |
| 476 | * |
| 477 | * Returns: --- |
| 478 | * |
| 479 | * Use: Dumps a list of allocated blocks to standard output. |
| 480 | */ |
| 481 | |
| 482 | void track_memlist(void) |
| 483 | { |
| 484 | szblock *q = memlist; |
| 485 | printf("listing blocks:\n"); |
| 486 | while (q) { |
| 487 | printf("... [%p] %lu\n", (void *)(q + 1), (unsigned long)q->x.sz); |
| 488 | q = q->x.next; |
| 489 | } |
| 490 | printf("done\n"); |
| 491 | } |
| 492 | |
| 493 | #endif |
| 494 | |
| 495 | /*----- That's all, folks -------------------------------------------------*/ |