mdw@git.distorted.org.uk Git - become/blob - src/utils.h

   1 /* -*-c-*-
   2  *
   3  * $Id: utils.h,v 1.4 1998/01/12 16:46:52 mdw Exp $
   4  *
   5  * Miscellaneous useful bits of code.
   6  *
   7  * (c) 1998 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.h,v $
  32  * Revision 1.4  1998/01/12 16:46:52  mdw
  33  * Fix copyright date.
  34  *
  35  * Revision 1.3  1997/08/20  16:25:37  mdw
  36  * Add some simple `malloc' tracking.
  37  *
  38  * Revision 1.2  1997/08/04 10:24:26  mdw
  39  * Sources placed under CVS control.
  40  *
  41  * Revision 1.1  1997/07/21  13:47:42  mdw
  42  * Initial revision
  43  *
  44  */
  45
  46 #ifndef UTILS_H
  47 #define UTILS_H
  48
  49 #ifdef __cplusplus
  50   extern "C" {
  51 #endif
  52
  53 /*----- Required header files ---------------------------------------------*/
  54
  55 #include <stddef.h>
  56 #include <stdlib.h>
  57
  58 /*----- Storing and retrieving numbers ------------------------------------*
  59  *
  60  * These use big-endian conventions, because they seem more usual in network
  61  * applications.  I actually think that little-endian is more sensible...
  62  */
  63
  64 #define load32(p)                                                       \
  65   ((((unsigned char)(p)[0] & 0xFF) << 24) |                             \
  66    (((unsigned char)(p)[1] & 0xFF) << 16) |                             \
  67    (((unsigned char)(p)[2] & 0xFF) <<  8) |                             \
  68    (((unsigned char)(p)[3] & 0xFF) <<  0))
  69
  70 #define store32(p, v)                                                   \
  71   ((p)[0] = ((unsigned long)(v) >> 24) & 0xFF,                          \
  72    (p)[1] = ((unsigned long)(v) >> 16) & 0xFF,                          \
  73    (p)[2] = ((unsigned long)(v) >>  8) & 0xFF,                          \
  74    (p)[3] = ((unsigned long)(v) >>  0) & 0xFF)
  75
  76 /* --- Little-endian versions (for MD5) --- */
  77
  78 #define load32_l(p)                                                     \
  79   ((((unsigned char)(p)[0] & 0xFF) <<  0) |                             \
  80    (((unsigned char)(p)[1] & 0xFF) <<  8) |                             \
  81    (((unsigned char)(p)[2] & 0xFF) << 16) |                             \
  82    (((unsigned char)(p)[3] & 0xFF) << 24))
  83
  84 #define store32_l(p, v)                                                 \
  85   ((p)[0] = ((unsigned long)(v) >>  0) & 0xFF,                          \
  86    (p)[1] = ((unsigned long)(v) >>  8) & 0xFF,                          \
  87    (p)[2] = ((unsigned long)(v) >> 16) & 0xFF,                          \
  88    (p)[3] = ((unsigned long)(v) >> 24) & 0xFF)
  89
  90 /*----- Other macros ------------------------------------------------------*/
  91
  92 /* --- @burn@ --- *
  93  *
  94  * Arguments:   @obj@ = some object
  95  *
  96  * Use:         Writes zero bytes over the object.
  97  */
  98
  99 #define burn(obj) ((void)memset(&obj, 0, sizeof(obj)))
 100
 101 /*----- Program name handling ---------------------------------------------*/
 102
 103 /* --- @quis@ --- *
 104  *
 105  * Arguments:   ---
 106  *
 107  * Returns:     Pointer to the program name.
 108  *
 109  * Use:         Returns the program name.
 110  */
 111
 112 extern const char *quis(void);
 113
 114 /* --- @ego@ --- *
 115  *
 116  * Arguments:   @const char *p@ = pointer to program name
 117  *
 118  * Returns:     ---
 119  *
 120  * Use:         Tells the utils library what the program's name is.
 121  */
 122
 123 extern void ego(const char */*p*/);
 124
 125 /*----- Error reporting ---------------------------------------------------*/
 126
 127 /* --- @moan@ --- *
 128  *
 129  * Arguments:   @const char *f@ = a @printf@-style format string
 130  *              @...@ = other arguments
 131  *
 132  * Returns:     ---
 133  *
 134  * Use:         Reports an error.
 135  */
 136
 137 extern void moan(const char */*f*/, ...);
 138
 139 /* --- @die@ --- *
 140  *
 141  * Arguments:   @const char *f@ = a @printf@-style format string
 142  *              @...@ = other arguments
 143  *
 144  * Returns:     Never.
 145  *
 146  * Use:         Reports an error and hari-kiris.  Like @moan@ above, only
 147  *              more permanent.
 148  */
 149
 150 extern void die(const char */*f*/, ...);
 151
 152 /*----- Trace messages ----------------------------------------------------*/
 153
 154 #if !defined(NDEBUG) && !defined(TRACING)
 155 #  define TRACING
 156 #endif
 157
 158 #ifdef TRACING
 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 extern void trace(unsigned int /*lvl*/, const char */*f*/, ...);
 172
 173 /* --- @traceblk@ --- *
 174  *
 175  * Arguments:   @unsigned int lvl@ = trace level for output
 176  *              @const char *hdr@ = some header string to write
 177  *              @const void *blk@ = pointer to a block of memory to dump
 178  *              @size_t sz@ = size of the block of memory
 179  *
 180  * Returns:     ---
 181  *
 182  * Use:         Dumps the contents of a block to the trace output.
 183  */
 184
 185 extern void traceblk(unsigned int /*lvl*/, const char */*hdr*/,
 186                      const void */*blk*/, size_t /*sz*/);
 187
 188 /* --- @traceon@ --- *
 189  *
 190  * Arguments:   @FILE *fp@ = a file to trace on
 191  *              @unsigned int lvl@ = trace level to set
 192  *
 193  * Returns:     ---
 194  *
 195  * Use:         Enables tracing to a file.
 196  */
 197
 198 extern void traceon(FILE */*fp*/, unsigned int /*lvl*/);
 199
 200 /* --- @tracesetlvl@ --- *
 201  *
 202  * Arguments:   @unsigned int lvl@ = trace level to set
 203  *
 204  * Returns:     ---
 205  *
 206  * Use:         Sets the tracing level.
 207  */
 208
 209 extern void tracesetlvl(unsigned int /*lvl*/);
 210
 211 /* --- @tracing@ --- *
 212  *
 213  * Arguments:   ---
 214  *
 215  * Returns:     Zero if not tracing, tracing level if tracing.
 216  *
 217  * Use:         Informs the caller whether tracing is enabled.
 218  */
 219
 220 extern unsigned int tracing(void);
 221
 222 #endif
 223
 224 /* --- Some hacky macros --- */
 225
 226 #ifdef TRACING
 227 #  define T(x) x
 228 #  define IF_TRACING(lvl, x) if ((lvl) & tracing()) x
 229 #else
 230 #  define T(x)
 231 #  define IF_TRACING(lvl, x)
 232 #endif
 233
 234 /*----- Memory management functions ---------------------------------------*/
 235
 236 /* --- @xmalloc@ --- *
 237  *
 238  * Arguments:   @size_t sz@ = size of block to allocate
 239  *
 240  * Returns:     Pointer to allocated block.
 241  *
 242  * Use:         Allocates memory.  If the memory isn't available, we don't
 243  *              hang aroung long enough for a normal function return.
 244  */
 245
 246 extern void *xmalloc(size_t /*sz*/);
 247
 248 /* --- @xstrdup@ --- *
 249  *
 250  * Arguments:   @const char *s@ = pointer to a string
 251  *
 252  * Returns:     Pointer to a copy of the string.
 253  *
 254  * Use:         Copies a string (like @strdup@ would, if it existed).
 255  */
 256
 257 extern char *xstrdup(const char */*s*/);
 258
 259 /* --- @xrealloc@ --- *
 260  *
 261  * Arguments:   @void *p@ = pointer to a block of memory
 262  *              @size_t sz@ = new size desired for the block
 263  *
 264  * Returns:     Pointer to the resized memory block (which is almost
 265  *              certainly not in the same place any more).
 266  *
 267  * Use:         Resizes a memory block.
 268  */
 269
 270 extern void *xrealloc(void */*p*/, size_t /*sz*/);
 271
 272 /*----- Simple memory use tracking ----------------------------------------*/
 273
 274 #undef TRACK_MALLOC
 275
 276 #ifdef TRACK_MALLOC
 277
 278 /* --- @track_malloc@ --- *
 279  *
 280  * Arguments:   @size_t sz@ = size requested
 281  *
 282  * Returns:     Pointer to allocated space, or null
 283  *
 284  * Use:         Allocates memory, and tracks how much is allocated.
 285  */
 286
 287 extern void *track_malloc(size_t /*sz*/);
 288
 289 /* --- @track_free@ --- *
 290  *
 291  * Arguments:   @void *p@ = pointer to an allocated block
 292  *
 293  * Returns:     ---
 294  *
 295  * Use:         Frees memory, and tracks how much is still allocated.
 296  */
 297
 298 extern void track_free(void */*p*/);
 299
 300 /* --- @track_realloc@ --- *
 301  *
 302  * Arguments:   @void *p@ = pointer to an allocated block
 303  *              @size_t sz@ = how big it wants to be
 304  *
 305  * Returns:     Pointer to the new block.
 306  *
 307  * Use:         Reallocates a block, tracking how much memory is still
 308  *              available.
 309  */
 310
 311 extern void *track_realloc(void */*p*/, size_t /*sz*/);
 312
 313 /* --- @track_memused@ --- *
 314  *
 315  * Arguments:   ---
 316  *
 317  * Returns:     A count of how much memory is used currently.
 318  *
 319  * Use:         Returns the amount of memory which the @track_@-functions
 320  *              above have counted as being currently allocated.
 321  */
 322
 323 extern unsigned long track_memused(void);
 324
 325 /* --- @track_memlist@ --- *
 326  *
 327  * Arguments:   ---
 328  *
 329  * Returns:     ---
 330  *
 331  * Use:         Dumps a list of allocated blocks to standard output.
 332  */
 333
 334 extern void track_memlist(void);
 335
 336 #undef malloc
 337 #define malloc(sz) track_malloc(sz)
 338
 339 #undef free
 340 #define free(p) track_free(p)
 341
 342 #undef realloc
 343 #define realloc(p, sz) track_realloc(p, sz)
 344
 345 #endif
 346
 347 /*----- That's all, folks -------------------------------------------------*/
 348
 349 #ifdef __cplusplus
 350   }
 351 #endif
 352
 353 #endif