nasmlib.c

   1 /* nasmlib.c    library routines for the Netwide Assembler
   2  *
   3  * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
   4  * Julian Hall. All rights reserved. The software is
   5  * redistributable under the licence given in the file "Licence"
   6  * distributed in the NASM archive.
   7  */
   8
   9 #include "compiler.h"
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <ctype.h>
  15 #include <inttypes.h>
  16
  17 #include "nasm.h"
  18 #include "nasmlib.h"
  19 #include "insns.h"
  20
  21 int globalbits = 0;    /* defined in nasm.h, works better here for ASM+DISASM */
  22 efunc nasm_malloc_error;        /* Exported for the benefit of vsnprintf.c */
  23
  24 #ifdef LOGALLOC
  25 static FILE *logfp;
  26 #endif
  27
  28 void nasm_set_malloc_error(efunc error)
  29 {
  30     nasm_malloc_error = error;
  31 #ifdef LOGALLOC
  32     logfp = fopen("malloc.log", "w");
  33     setvbuf(logfp, NULL, _IOLBF, BUFSIZ);
  34     fprintf(logfp, "null pointer is %p\n", NULL);
  35 #endif
  36 }
  37
  38 #ifdef LOGALLOC
  39 void *nasm_malloc_log(char *file, int line, size_t size)
  40 #else
  41 void *nasm_malloc(size_t size)
  42 #endif
  43 {
  44     void *p = malloc(size);
  45     if (!p)
  46         nasm_malloc_error(ERR_FATAL | ERR_NOFILE, "out of memory");
  47 #ifdef LOGALLOC
  48     else
  49         fprintf(logfp, "%s %d malloc(%ld) returns %p\n",
  50                 file, line, (long)size, p);
  51 #endif
  52     return p;
  53 }
  54
  55 #ifdef LOGALLOC
  56 void *nasm_zalloc_log(char *file, int line, size_t size)
  57 #else
  58 void *nasm_zalloc(size_t size)
  59 #endif
  60 {
  61     void *p = calloc(size, 1);
  62     if (!p)
  63         nasm_malloc_error(ERR_FATAL | ERR_NOFILE, "out of memory");
  64 #ifdef LOGALLOC
  65     else
  66         fprintf(logfp, "%s %d calloc(%ld, 1) returns %p\n",
  67                 file, line, (long)size, p);
  68 #endif
  69     return p;
  70 }
  71
  72 #ifdef LOGALLOC
  73 void *nasm_realloc_log(char *file, int line, void *q, size_t size)
  74 #else
  75 void *nasm_realloc(void *q, size_t size)
  76 #endif
  77 {
  78     void *p = q ? realloc(q, size) : malloc(size);
  79     if (!p)
  80         nasm_malloc_error(ERR_FATAL | ERR_NOFILE, "out of memory");
  81 #ifdef LOGALLOC
  82     else if (q)
  83         fprintf(logfp, "%s %d realloc(%p,%ld) returns %p\n",
  84                 file, line, q, (long)size, p);
  85     else
  86         fprintf(logfp, "%s %d malloc(%ld) returns %p\n",
  87                 file, line, (long)size, p);
  88 #endif
  89     return p;
  90 }
  91
  92 #ifdef LOGALLOC
  93 void nasm_free_log(char *file, int line, void *q)
  94 #else
  95 void nasm_free(void *q)
  96 #endif
  97 {
  98     if (q) {
  99         free(q);
 100 #ifdef LOGALLOC
 101         fprintf(logfp, "%s %d free(%p)\n", file, line, q);
 102 #endif
 103     }
 104 }
 105
 106 #ifdef LOGALLOC
 107 char *nasm_strdup_log(char *file, int line, const char *s)
 108 #else
 109 char *nasm_strdup(const char *s)
 110 #endif
 111 {
 112     char *p;
 113     int size = strlen(s) + 1;
 114
 115     p = malloc(size);
 116     if (!p)
 117         nasm_malloc_error(ERR_FATAL | ERR_NOFILE, "out of memory");
 118 #ifdef LOGALLOC
 119     else
 120         fprintf(logfp, "%s %d strdup(%ld) returns %p\n",
 121                 file, line, (long)size, p);
 122 #endif
 123     strcpy(p, s);
 124     return p;
 125 }
 126
 127 #ifdef LOGALLOC
 128 char *nasm_strndup_log(char *file, int line, char *s, size_t len)
 129 #else
 130 char *nasm_strndup(char *s, size_t len)
 131 #endif
 132 {
 133     char *p;
 134     int size = len + 1;
 135
 136     p = malloc(size);
 137     if (!p)
 138         nasm_malloc_error(ERR_FATAL | ERR_NOFILE, "out of memory");
 139 #ifdef LOGALLOC
 140     else
 141         fprintf(logfp, "%s %d strndup(%ld) returns %p\n",
 142                 file, line, (long)size, p);
 143 #endif
 144     strncpy(p, s, len);
 145     p[len] = '\0';
 146     return p;
 147 }
 148
 149 #ifndef nasm_stricmp
 150 int nasm_stricmp(const char *s1, const char *s2)
 151 {
 152     while (*s1 && tolower(*s1) == tolower(*s2))
 153         s1++, s2++;
 154     if (!*s1 && !*s2)
 155         return 0;
 156     else if (tolower(*s1) < tolower(*s2))
 157         return -1;
 158     else
 159         return 1;
 160 }
 161 #endif
 162
 163 #ifndef nasm_strnicmp
 164 int nasm_strnicmp(const char *s1, const char *s2, int n)
 165 {
 166     while (n > 0 && *s1 && tolower(*s1) == tolower(*s2))
 167         s1++, s2++, n--;
 168     if ((!*s1 && !*s2) || n == 0)
 169         return 0;
 170     else if (tolower(*s1) < tolower(*s2))
 171         return -1;
 172     else
 173         return 1;
 174 }
 175 #endif
 176
 177 #ifndef nasm_strsep
 178 char *nasm_strsep(char **stringp, const char *delim)
 179 {
 180         char *s = *stringp;
 181         char *e;
 182
 183         if (!s)
 184                 return NULL;
 185
 186         e = strpbrk(s, delim);
 187         if (e)
 188                 *e++ = '\0';
 189
 190         *stringp = e;
 191         return s;
 192 }
 193 #endif
 194
 195
 196 #define lib_isnumchar(c)   (isalnum(c) || (c) == '$' || (c) == '_')
 197 #define numvalue(c)  ((c)>='a' ? (c)-'a'+10 : (c)>='A' ? (c)-'A'+10 : (c)-'0')
 198
 199 static int radix_letter(char c)
 200 {
 201     switch (c) {
 202     case 'b': case 'B':
 203     case 'y': case 'Y':
 204         return 2;               /* Binary */
 205     case 'o': case 'O':
 206     case 'q': case 'Q':
 207         return 8;               /* Octal */
 208     case 'h': case 'H':
 209     case 'x': case 'X':
 210         return 16;              /* Hexadecimal */
 211     case 'd': case 'D':
 212     case 't': case 'T':
 213         return 10;              /* Decimal */
 214     default:
 215         return 0;               /* Not a known radix letter */
 216     }
 217 }
 218
 219 int64_t readnum(char *str, bool *error)
 220 {
 221     char *r = str, *q;
 222     int32_t pradix, sradix, radix;
 223     int plen, slen, len;
 224     uint64_t result, checklimit;
 225     int digit, last;
 226     bool warn = false;
 227     int sign = 1;
 228
 229     *error = false;
 230
 231     while (isspace(*r))
 232         r++;                    /* find start of number */
 233
 234     /*
 235      * If the number came from make_tok_num (as a result of an %assign), it
 236      * might have a '-' built into it (rather than in a preceeding token).
 237      */
 238     if (*r == '-') {
 239         r++;
 240         sign = -1;
 241     }
 242
 243     q = r;
 244
 245     while (lib_isnumchar(*q))
 246         q++;                    /* find end of number */
 247
 248     len = q-r;
 249     if (!len) {
 250         /* Not numeric */
 251         *error = true;
 252         return 0;
 253     }
 254
 255     /*
 256      * Handle radix formats:
 257      *
 258      * 0<radix-letter><string>
 259      * $<string>                (hexadecimal)
 260      * <string><radix-letter>
 261      */
 262     pradix = sradix = 0;
 263     plen = slen = 0;
 264
 265     if (len > 2 && *r == '0' && (pradix = radix_letter(r[1])) != 0)
 266         plen = 2;
 267     else if (len > 1 && *r == '$')
 268         pradix = 16, plen = 1;
 269
 270     if (len > 1 && (sradix = radix_letter(q[-1])) != 0)
 271         slen = 1;
 272
 273     if (pradix > sradix) {
 274         radix = pradix;
 275         r += plen;
 276     } else if (sradix > pradix) {
 277         radix = sradix;
 278         q -= slen;
 279     } else {
 280         /* Either decimal, or invalid -- if invalid, we'll trip up
 281            further down. */
 282         radix = 10;
 283     }
 284
 285     /*
 286      * `checklimit' must be 2**(32|64) / radix. We can't do that in
 287      * 32/64-bit arithmetic, which we're (probably) using, so we
 288      * cheat: since we know that all radices we use are even, we
 289      * can divide 2**(31|63) by radix/2 instead.
 290      */
 291     if (globalbits == 64)
 292         checklimit = 0x8000000000000000ULL / (radix >> 1);
 293     else
 294         checklimit = 0x80000000UL / (radix >> 1);
 295
 296     /*
 297      * Calculate the highest allowable value for the last digit of a
 298      * 32-bit constant... in radix 10, it is 6, otherwise it is 0
 299      */
 300     last = (radix == 10 ? 6 : 0);
 301
 302     result = 0;
 303     while (*r && r < q) {
 304         if (*r != '_') {
 305             if (*r < '0' || (*r > '9' && *r < 'A')
 306                 || (digit = numvalue(*r)) >= radix) {
 307                 *error = true;
 308                 return 0;
 309             }
 310             if (result > checklimit ||
 311                 (result == checklimit && digit >= last)) {
 312                 warn = true;
 313             }
 314
 315             result = radix * result + digit;
 316         }
 317         r++;
 318     }
 319
 320     if (warn)
 321         nasm_malloc_error(ERR_WARNING | ERR_PASS1 | ERR_WARN_NOV,
 322                           "numeric constant %s does not fit in 32 bits",
 323                           str);
 324
 325     return result * sign;
 326 }
 327
 328 int64_t readstrnum(char *str, int length, bool *warn)
 329 {
 330     int64_t charconst = 0;
 331     int i;
 332
 333     *warn = false;
 334
 335     str += length;
 336     if (globalbits == 64) {
 337         for (i = 0; i < length; i++) {
 338             if (charconst & 0xFF00000000000000ULL)
 339                 *warn = true;
 340             charconst = (charconst << 8) + (uint8_t)*--str;
 341         }
 342     } else {
 343         for (i = 0; i < length; i++) {
 344             if (charconst & 0xFF000000UL)
 345                 *warn = true;
 346             charconst = (charconst << 8) + (uint8_t)*--str;
 347         }
 348     }
 349     return charconst;
 350 }
 351
 352 static int32_t next_seg;
 353
 354 void seg_init(void)
 355 {
 356     next_seg = 0;
 357 }
 358
 359 int32_t seg_alloc(void)
 360 {
 361     return (next_seg += 2) - 2;
 362 }
 363
 364 #if X86_MEMORY
 365
 366 void fwriteint16_t(int data, FILE * fp)
 367 {
 368     uint16_t d = data;
 369     fwrite(&d, 1, 2, fp);
 370 }
 371
 372 void fwriteint32_t(int32_t data, FILE * fp)
 373 {
 374     uint32_t d = data;
 375     fwrite(&d, 1, 4, fp);
 376 }
 377
 378 void fwriteint64_t(int64_t data, FILE * fp)
 379 {
 380     uint64_t d = data;
 381     fwrite(&d, 1, 8, fp);
 382 }
 383
 384 void fwriteaddr(int64_t data, int size, FILE * fp)
 385 {
 386     uint64_t d = data;
 387     fwrite(&d, 1, size, fp);
 388 }
 389
 390 #else /* !X86_MEMORY */
 391
 392 void fwriteint16_t(int data, FILE * fp)
 393 {
 394     char buffer[2], *p = buffer;
 395     WRITESHORT(p, data);
 396     fwrite(buffer, 1, 2, fp);
 397 }
 398
 399 void fwriteint32_t(int32_t data, FILE * fp)
 400 {
 401     char buffer[4], *p = buffer;
 402     WRITELONG(p, data);
 403     fwrite(buffer, 1, 4, fp);
 404 }
 405
 406 void fwriteint64_t(int64_t data, FILE * fp)
 407 {
 408     char buffer[8], *p = buffer;
 409     WRITEDLONG(p, data);
 410     fwrite(buffer, 1, 8, fp);
 411 }
 412
 413 void fwriteaddr(int64_t data, int size, FILE * fp)
 414 {
 415     char buffer[8], *p = buffer;
 416     WRITEADDR(p, data, size);
 417     fwrite(buffer, 1, size, fp);
 418 }
 419
 420 #endif
 421
 422 void standard_extension(char *inname, char *outname, char *extension,
 423                         efunc error)
 424 {
 425     char *p, *q;
 426
 427     if (*outname)               /* file name already exists, */
 428         return;                 /* so do nothing */
 429     q = inname;
 430     p = outname;
 431     while (*q)
 432         *p++ = *q++;            /* copy, and find end of string */
 433     *p = '\0';                  /* terminate it */
 434     while (p > outname && *--p != '.') ;        /* find final period (or whatever) */
 435     if (*p != '.')
 436         while (*p)
 437             p++;                /* go back to end if none found */
 438     if (!strcmp(p, extension)) {        /* is the extension already there? */
 439         if (*extension)
 440             error(ERR_WARNING | ERR_NOFILE,
 441                   "file name already ends in `%s': "
 442                   "output will be in `nasm.out'", extension);
 443         else
 444             error(ERR_WARNING | ERR_NOFILE,
 445                   "file name already has no extension: "
 446                   "output will be in `nasm.out'");
 447         strcpy(outname, "nasm.out");
 448     } else
 449         strcpy(p, extension);
 450 }
 451
 452 #define LEAFSIZ (sizeof(RAA)-sizeof(RAA_UNION)+sizeof(RAA_LEAF))
 453 #define BRANCHSIZ (sizeof(RAA)-sizeof(RAA_UNION)+sizeof(RAA_BRANCH))
 454
 455 #define LAYERSIZ(r) ( (r)->layers==0 ? RAA_BLKSIZE : RAA_LAYERSIZE )
 456
 457 static struct RAA *real_raa_init(int layers)
 458 {
 459     struct RAA *r;
 460     int i;
 461
 462     if (layers == 0) {
 463         r = nasm_zalloc(LEAFSIZ);
 464         r->stepsize = 1L;
 465     } else {
 466         r = nasm_malloc(BRANCHSIZ);
 467         r->layers = layers;
 468         for (i = 0; i < RAA_LAYERSIZE; i++)
 469             r->u.b.data[i] = NULL;
 470         r->stepsize = RAA_BLKSIZE;
 471         while (--layers)
 472             r->stepsize *= RAA_LAYERSIZE;
 473     }
 474     return r;
 475 }
 476
 477 struct RAA *raa_init(void)
 478 {
 479     return real_raa_init(0);
 480 }
 481
 482 void raa_free(struct RAA *r)
 483 {
 484     if (r->layers == 0)
 485         nasm_free(r);
 486     else {
 487         struct RAA **p;
 488         for (p = r->u.b.data; p - r->u.b.data < RAA_LAYERSIZE; p++)
 489             if (*p)
 490                 raa_free(*p);
 491     }
 492 }
 493
 494 int64_t raa_read(struct RAA *r, int32_t posn)
 495 {
 496     if (posn >= r->stepsize * LAYERSIZ(r))
 497         return 0;               /* Return 0 for undefined entries */
 498     while (r->layers > 0) {
 499         ldiv_t l;
 500         l = ldiv(posn, r->stepsize);
 501         r = r->u.b.data[l.quot];
 502         posn = l.rem;
 503         if (!r)
 504             return 0;           /* Return 0 for undefined entries */
 505     }
 506     return r->u.l.data[posn];
 507 }
 508
 509 struct RAA *raa_write(struct RAA *r, int32_t posn, int64_t value)
 510 {
 511     struct RAA *result;
 512
 513     if (posn < 0)
 514         nasm_malloc_error(ERR_PANIC, "negative position in raa_write");
 515
 516     while (r->stepsize * LAYERSIZ(r) <= posn) {
 517         /*
 518          * Must add a layer.
 519          */
 520         struct RAA *s;
 521         int i;
 522
 523         s = nasm_malloc(BRANCHSIZ);
 524         for (i = 0; i < RAA_LAYERSIZE; i++)
 525             s->u.b.data[i] = NULL;
 526         s->layers = r->layers + 1;
 527         s->stepsize = LAYERSIZ(r) * r->stepsize;
 528         s->u.b.data[0] = r;
 529         r = s;
 530     }
 531
 532     result = r;
 533
 534     while (r->layers > 0) {
 535         ldiv_t l;
 536         struct RAA **s;
 537         l = ldiv(posn, r->stepsize);
 538         s = &r->u.b.data[l.quot];
 539         if (!*s)
 540             *s = real_raa_init(r->layers - 1);
 541         r = *s;
 542         posn = l.rem;
 543     }
 544
 545     r->u.l.data[posn] = value;
 546
 547     return result;
 548 }
 549
 550 /* Aggregate SAA components smaller than this */
 551 #define SAA_BLKLEN 65536
 552
 553 struct SAA *saa_init(size_t elem_len)
 554 {
 555     struct SAA *s;
 556     char *data;
 557
 558     s = nasm_zalloc(sizeof(struct SAA));
 559
 560     if (elem_len >= SAA_BLKLEN)
 561         s->blk_len = elem_len;
 562     else
 563         s->blk_len = SAA_BLKLEN - (SAA_BLKLEN % elem_len);
 564
 565     s->elem_len = elem_len;
 566     s->length = s->blk_len;
 567     data = nasm_malloc(s->blk_len);
 568     s->nblkptrs = s->nblks = 1;
 569     s->blk_ptrs = nasm_malloc(sizeof(char *));
 570     s->blk_ptrs[0] = data;
 571     s->wblk = s->rblk = &s->blk_ptrs[0];
 572
 573     return s;
 574 }
 575
 576 void saa_free(struct SAA *s)
 577 {
 578     char **p;
 579     size_t n;
 580
 581     for (p = s->blk_ptrs, n = s->nblks; n; p++, n--)
 582         nasm_free(*p);
 583
 584     nasm_free(s->blk_ptrs);
 585     nasm_free(s);
 586 }
 587
 588 /* Add one allocation block to an SAA */
 589 static void saa_extend(struct SAA *s)
 590 {
 591     size_t blkn = s->nblks++;
 592
 593     if (blkn >= s->nblkptrs) {
 594         size_t rindex = s->rblk - s->blk_ptrs;
 595         size_t windex = s->wblk - s->blk_ptrs;
 596
 597         s->nblkptrs <<= 1;
 598         s->blk_ptrs = nasm_realloc(s->blk_ptrs, s->nblkptrs*sizeof(char *));
 599
 600         s->rblk = s->blk_ptrs + rindex;
 601         s->wblk = s->blk_ptrs + windex;
 602     }
 603
 604     s->blk_ptrs[blkn] = nasm_malloc(s->blk_len);
 605     s->length += s->blk_len;
 606 }
 607
 608 void *saa_wstruct(struct SAA *s)
 609 {
 610     void *p;
 611
 612     if (s->wpos % s->elem_len)
 613             nasm_malloc_error(ERR_PANIC|ERR_NOFILE,
 614                               "misaligned wpos in saa_wstruct");
 615
 616     if (s->wpos + s->elem_len > s->blk_len) {
 617         if (s->wpos != s->blk_len)
 618             nasm_malloc_error(ERR_PANIC|ERR_NOFILE,
 619                               "unfilled block in saa_wstruct");
 620
 621         if (s->wptr + s->elem_len > s->length)
 622             saa_extend(s);
 623         s->wblk++;
 624         s->wpos = 0;
 625     }
 626
 627     p = *s->wblk + s->wpos;
 628     s->wpos += s->elem_len;
 629     s->wptr += s->elem_len;
 630
 631     if (s->wptr > s->datalen)
 632         s->datalen = s->wptr;
 633
 634     return p;
 635 }
 636
 637 void saa_wbytes(struct SAA *s, const void *data, size_t len)
 638 {
 639     const char *d = data;
 640
 641     while (len) {
 642         size_t l = s->blk_len - s->wpos;
 643         if (l > len)
 644             l = len;
 645         if (l) {
 646             if (d) {
 647                 memcpy(*s->wblk + s->wpos, d, l);
 648                 d += l;
 649             } else
 650                 memset(*s->wblk + s->wpos, 0, l);
 651             s->wpos += l;
 652             s->wptr += l;
 653             len -= l;
 654
 655             if (s->datalen < s->wptr)
 656                 s->datalen = s->wptr;
 657         }
 658         if (len) {
 659             if (s->wptr >= s->length)
 660                 saa_extend(s);
 661             s->wblk++;
 662             s->wpos = 0;
 663         }
 664     }
 665 }
 666
 667 void saa_rewind(struct SAA *s)
 668 {
 669     s->rblk = s->blk_ptrs;
 670     s->rpos = s->rptr = 0;
 671 }
 672
 673 void *saa_rstruct(struct SAA *s)
 674 {
 675     void *p;
 676
 677     if (s->rptr + s->elem_len > s->datalen)
 678         return NULL;
 679
 680     if (s->rpos % s->elem_len)
 681             nasm_malloc_error(ERR_PANIC|ERR_NOFILE,
 682                               "misaligned rpos in saa_rstruct");
 683
 684     if (s->rpos + s->elem_len > s->blk_len) {
 685         s->rblk++;
 686         s->rpos = 0;
 687     }
 688
 689     p = *s->rblk + s->rpos;
 690     s->rpos += s->elem_len;
 691     s->rptr += s->elem_len;
 692
 693     return p;
 694 }
 695
 696 const void *saa_rbytes(struct SAA *s, size_t *lenp)
 697 {
 698     const void *p;
 699     size_t len;
 700
 701     if (s->rptr >= s->datalen) {
 702         *lenp = 0;
 703         return NULL;
 704     }
 705
 706     if (s->rpos >= s->blk_len) {
 707         s->rblk++;
 708         s->rpos = 0;
 709     }
 710
 711     len = *lenp;
 712     if (len > s->datalen - s->rptr)
 713         len = s->datalen - s->rptr;
 714     if (len > s->blk_len - s->rpos)
 715         len = s->blk_len - s->rpos;
 716
 717     *lenp = len;
 718     p = *s->rblk + s->rpos;
 719
 720     s->rpos += len;
 721     s->rptr += len;
 722
 723     return p;
 724 }
 725
 726 void saa_rnbytes(struct SAA *s, void *data, size_t len)
 727 {
 728     char *d = data;
 729
 730     if (s->rptr + len > s->datalen) {
 731         nasm_malloc_error(ERR_PANIC|ERR_NOFILE, "overrun in saa_rnbytes");
 732         return;
 733     }
 734
 735     while (len) {
 736         size_t l;
 737         const void *p;
 738
 739         l = len;
 740         p = saa_rbytes(s, &l);
 741
 742         memcpy(d, p, l);
 743         d   += l;
 744         len -= l;
 745     }
 746 }
 747
 748 /* Same as saa_rnbytes, except position the counter first */
 749 void saa_fread(struct SAA *s, size_t posn, void *data, size_t len)
 750 {
 751     size_t ix;
 752
 753     if (posn+len > s->datalen) {
 754         nasm_malloc_error(ERR_PANIC|ERR_NOFILE, "overrun in saa_fread");
 755         return;
 756     }
 757
 758     ix = posn / s->blk_len;
 759     s->rptr = posn;
 760     s->rpos = posn % s->blk_len;
 761     s->rblk = &s->blk_ptrs[ix];
 762
 763     saa_rnbytes(s, data, len);
 764 }
 765
 766 /* Same as saa_wbytes, except position the counter first */
 767 void saa_fwrite(struct SAA *s, size_t posn, const void *data, size_t len)
 768 {
 769     size_t ix;
 770
 771     if (posn > s->datalen) {
 772         /* Seek beyond the end of the existing array not supported */
 773         nasm_malloc_error(ERR_PANIC|ERR_NOFILE, "overrun in saa_fwrite");
 774         return;
 775     }
 776
 777     ix = posn / s->blk_len;
 778     s->wptr = posn;
 779     s->wpos = posn % s->blk_len;
 780     s->wblk = &s->blk_ptrs[ix];
 781
 782     if (!s->wpos) {
 783         s->wpos = s->blk_len;
 784         s->wblk--;
 785     }
 786
 787     saa_wbytes(s, data, len);
 788 }
 789
 790 void saa_fpwrite(struct SAA *s, FILE * fp)
 791 {
 792     const char *data;
 793     size_t len;
 794
 795     saa_rewind(s);
 796     while (len = s->datalen, (data = saa_rbytes(s, &len)) != NULL)
 797         fwrite(data, 1, len, fp);
 798 }
 799
 800 /*
 801  * Common list of prefix names
 802  */
 803 static const char *prefix_names[] = {
 804     "a16", "a32", "lock", "o16", "o32", "rep", "repe", "repne",
 805     "repnz", "repz", "times"
 806 };
 807
 808 const char *prefix_name(int token)
 809 {
 810     unsigned int prefix = token-PREFIX_ENUM_START;
 811     if (prefix > elements(prefix_names))
 812         return NULL;
 813
 814     return prefix_names[prefix];
 815 }
 816
 817 /*
 818  * Binary search.
 819  */
 820 int bsi(const char *string, const char **array, int size)
 821 {
 822     int i = -1, j = size;       /* always, i < index < j */
 823     while (j - i >= 2) {
 824         int k = (i + j) / 2;
 825         int l = strcmp(string, array[k]);
 826         if (l < 0)              /* it's in the first half */
 827             j = k;
 828         else if (l > 0)         /* it's in the second half */
 829             i = k;
 830         else                    /* we've got it :) */
 831             return k;
 832     }
 833     return -1;                  /* we haven't got it :( */
 834 }
 835
 836 int bsii(const char *string, const char **array, int size)
 837 {
 838     int i = -1, j = size;       /* always, i < index < j */
 839     while (j - i >= 2) {
 840         int k = (i + j) / 2;
 841         int l = nasm_stricmp(string, array[k]);
 842         if (l < 0)              /* it's in the first half */
 843             j = k;
 844         else if (l > 0)         /* it's in the second half */
 845             i = k;
 846         else                    /* we've got it :) */
 847             return k;
 848     }
 849     return -1;                  /* we haven't got it :( */
 850 }
 851
 852 static char *file_name = NULL;
 853 static int32_t line_number = 0;
 854
 855 char *src_set_fname(char *newname)
 856 {
 857     char *oldname = file_name;
 858     file_name = newname;
 859     return oldname;
 860 }
 861
 862 int32_t src_set_linnum(int32_t newline)
 863 {
 864     int32_t oldline = line_number;
 865     line_number = newline;
 866     return oldline;
 867 }
 868
 869 int32_t src_get_linnum(void)
 870 {
 871     return line_number;
 872 }
 873
 874 int src_get(int32_t *xline, char **xname)
 875 {
 876     if (!file_name || !*xname || strcmp(*xname, file_name)) {
 877         nasm_free(*xname);
 878         *xname = file_name ? nasm_strdup(file_name) : NULL;
 879         *xline = line_number;
 880         return -2;
 881     }
 882     if (*xline != line_number) {
 883         int32_t tmp = line_number - *xline;
 884         *xline = line_number;
 885         return tmp;
 886     }
 887     return 0;
 888 }
 889
 890 void nasm_quote(char **str)
 891 {
 892     int ln = strlen(*str);
 893     char q = (*str)[0];
 894     char *p;
 895     if (ln > 1 && (*str)[ln - 1] == q && (q == '"' || q == '\''))
 896         return;
 897     q = '"';
 898     if (strchr(*str, q))
 899         q = '\'';
 900     p = nasm_malloc(ln + 3);
 901     strcpy(p + 1, *str);
 902     nasm_free(*str);
 903     p[ln + 1] = p[0] = q;
 904     p[ln + 2] = 0;
 905     *str = p;
 906 }
 907
 908 char *nasm_strcat(char *one, char *two)
 909 {
 910     char *rslt;
 911     int l1 = strlen(one);
 912     rslt = nasm_malloc(l1 + strlen(two) + 1);
 913     strcpy(rslt, one);
 914     strcpy(rslt + l1, two);
 915     return rslt;
 916 }
 917
 918 void null_debug_init(struct ofmt *of, void *id, FILE * fp, efunc error)
 919 {
 920         (void)of;
 921         (void)id;
 922         (void)fp;
 923         (void)error;
 924 }
 925 void null_debug_linenum(const char *filename, int32_t linenumber, int32_t segto)
 926 {
 927         (void)filename;
 928         (void)linenumber;
 929         (void)segto;
 930 }
 931 void null_debug_deflabel(char *name, int32_t segment, int64_t offset,
 932                          int is_global, char *special)
 933 {
 934         (void)name;
 935         (void)segment;
 936         (void)offset;
 937         (void)is_global;
 938         (void)special;
 939 }
 940 void null_debug_routine(const char *directive, const char *params)
 941 {
 942         (void)directive;
 943         (void)params;
 944 }
 945 void null_debug_typevalue(int32_t type)
 946 {
 947         (void)type;
 948 }
 949 void null_debug_output(int type, void *param)
 950 {
 951         (void)type;
 952         (void)param;
 953 }
 954 void null_debug_cleanup(void)
 955 {
 956 }
 957
 958 struct dfmt null_debug_form = {
 959     "Null debug format",
 960     "null",
 961     null_debug_init,
 962     null_debug_linenum,
 963     null_debug_deflabel,
 964     null_debug_routine,
 965     null_debug_typevalue,
 966     null_debug_output,
 967     null_debug_cleanup
 968 };
 969
 970 struct dfmt *null_debug_arr[2] = { &null_debug_form, NULL };