crypto/err/err.c

   1 /* crypto/err/err.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "lhash.h"
  61 #include "crypto.h"
  62 #include "cryptlib.h"
  63 #include "buffer.h"
  64 #include "err.h"
  65 #include "crypto.h"
  66
  67
  68 static LHASH *error_hash=NULL;
  69 static LHASH *thread_hash=NULL;
  70
  71 #ifndef NOPROTO
  72 static unsigned long err_hash(ERR_STRING_DATA *a);
  73 static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b);
  74 static unsigned long pid_hash(ERR_STATE *pid);
  75 static int pid_cmp(ERR_STATE *a,ERR_STATE *pid);
  76 static unsigned long get_error_values(int inc,char **file,int *line,
  77         char **data,int *flags);
  78 static void ERR_STATE_free(ERR_STATE *s);
  79 #else
  80 static unsigned long err_hash();
  81 static int err_cmp();
  82 static unsigned long pid_hash();
  83 static int pid_cmp();
  84 static void ERR_STATE_free();
  85 ERR_STATE *s;
  86 #endif
  87
  88 #ifndef NO_ERR
  89 static ERR_STRING_DATA ERR_str_libraries[]=
  90         {
  91 {ERR_PACK(ERR_LIB_NONE,0,0)             ,"unknown library"},
  92 {ERR_PACK(ERR_LIB_SYS,0,0)              ,"system library"},
  93 {ERR_PACK(ERR_LIB_BN,0,0)               ,"bignum routines"},
  94 {ERR_PACK(ERR_LIB_RSA,0,0)              ,"rsa routines"},
  95 {ERR_PACK(ERR_LIB_DH,0,0)               ,"Diffie-Hellman routines"},
  96 {ERR_PACK(ERR_LIB_EVP,0,0)              ,"digital envelope routines"},
  97 {ERR_PACK(ERR_LIB_BUF,0,0)              ,"memory buffer routines"},
  98 {ERR_PACK(ERR_LIB_BIO,0,0)              ,"BIO routines"},
  99 {ERR_PACK(ERR_LIB_OBJ,0,0)              ,"object identifier routines"},
 100 {ERR_PACK(ERR_LIB_PEM,0,0)              ,"PEM routines"},
 101 {ERR_PACK(ERR_LIB_ASN1,0,0)             ,"asn1 encoding routines"},
 102 {ERR_PACK(ERR_LIB_X509,0,0)             ,"x509 certificate routines"},
 103 {ERR_PACK(ERR_LIB_CONF,0,0)             ,"configuation file routines"},
 104 {ERR_PACK(ERR_LIB_METH,0,0)             ,"X509 lookup 'method' routines"},
 105 {ERR_PACK(ERR_LIB_SSL,0,0)              ,"SSL routines"},
 106 {ERR_PACK(ERR_LIB_RSAREF,0,0)           ,"RSAref routines"},
 107 {ERR_PACK(ERR_LIB_PROXY,0,0)            ,"Proxy routines"},
 108 {ERR_PACK(ERR_LIB_BIO,0,0)              ,"BIO routines"},
 109 {ERR_PACK(ERR_LIB_PKCS7,0,0)            ,"PKCS7 routines"},
 110 {0,NULL},
 111         };
 112
 113 static ERR_STRING_DATA ERR_str_functs[]=
 114         {
 115         {ERR_PACK(0,SYS_F_FOPEN,0),             "fopen"},
 116         {ERR_PACK(0,SYS_F_CONNECT,0),           "connect"},
 117         {ERR_PACK(0,SYS_F_GETSERVBYNAME,0),     "getservbyname"},
 118         {ERR_PACK(0,SYS_F_SOCKET,0),            "socket"},
 119         {ERR_PACK(0,SYS_F_IOCTLSOCKET,0),       "ioctlsocket"},
 120         {ERR_PACK(0,SYS_F_BIND,0),              "bind"},
 121         {ERR_PACK(0,SYS_F_LISTEN,0),            "listen"},
 122         {ERR_PACK(0,SYS_F_ACCEPT,0),            "accept"},
 123 #ifdef WINDOWS
 124         {ERR_PACK(0,SYS_F_WSASTARTUP,0),        "WSAstartup"},
 125 #endif
 126         {0,NULL},
 127         };
 128
 129 static ERR_STRING_DATA ERR_str_reasons[]=
 130         {
 131 {ERR_R_FATAL                             ,"fatal"},
 132 {ERR_R_SYS_LIB                          ,"system lib"},
 133 {ERR_R_BN_LIB                           ,"BN lib"},
 134 {ERR_R_RSA_LIB                          ,"RSA lib"},
 135 {ERR_R_DH_LIB                           ,"DH lib"},
 136 {ERR_R_EVP_LIB                          ,"EVP lib"},
 137 {ERR_R_BUF_LIB                          ,"BUF lib"},
 138 {ERR_R_BIO_LIB                          ,"BIO lib"},
 139 {ERR_R_OBJ_LIB                          ,"OBJ lib"},
 140 {ERR_R_PEM_LIB                          ,"PEM lib"},
 141 {ERR_R_X509_LIB                         ,"X509 lib"},
 142 {ERR_R_METH_LIB                         ,"METH lib"},
 143 {ERR_R_ASN1_LIB                         ,"ASN1 lib"},
 144 {ERR_R_CONF_LIB                         ,"CONF lib"},
 145 {ERR_R_SSL_LIB                          ,"SSL lib"},
 146 {ERR_R_PROXY_LIB                        ,"PROXY lib"},
 147 {ERR_R_BIO_LIB                          ,"BIO lib"},
 148 {ERR_R_PKCS7_LIB                        ,"PKCS7 lib"},
 149 {ERR_R_MALLOC_FAILURE                   ,"Malloc failure"},
 150 {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED      ,"called a fuction you should not call"},
 151 {0,NULL},
 152         };
 153 #endif
 154
 155 #define err_clear_data(p,i) \
 156         if (((p)->err_data[i] != NULL) && \
 157                 (p)->err_data_flags[i] & ERR_TXT_MALLOCED) \
 158                 {  \
 159                 Free((p)->err_data[i]); \
 160                 (p)->err_data[i]=NULL; \
 161                 } \
 162         (p)->err_data_flags[i]=0;
 163
 164 static void ERR_STATE_free(s)
 165 ERR_STATE *s;
 166         {
 167         int i;
 168
 169         for (i=0; i<ERR_NUM_ERRORS; i++)
 170                 {
 171                 err_clear_data(s,i);
 172                 }
 173         Free(s);
 174         }
 175
 176 void ERR_load_ERR_strings()
 177         {
 178         static int init=1;
 179
 180         if (init)
 181                 {
 182                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 183                 if (init == 0)
 184                         {
 185                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 186                         return;
 187                         }
 188                 init=0;
 189                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 190
 191 #ifndef NO_ERR
 192                 ERR_load_strings(0,ERR_str_libraries);
 193                 ERR_load_strings(0,ERR_str_reasons);
 194                 ERR_load_strings(ERR_LIB_SYS,ERR_str_functs);
 195 #endif
 196                 }
 197         }
 198
 199 void ERR_load_strings(lib,str)
 200 int lib;
 201 ERR_STRING_DATA *str;
 202         {
 203         if (error_hash == NULL)
 204                 {
 205                 CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
 206                 error_hash=lh_new(err_hash,err_cmp);
 207                 if (error_hash == NULL)
 208                         {
 209                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 210                         return;
 211                         }
 212                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 213
 214                 ERR_load_ERR_strings();
 215                 }
 216
 217         CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
 218         while (str->error)
 219                 {
 220                 str->error|=ERR_PACK(lib,0,0);
 221                 lh_insert(error_hash,(char *)str);
 222                 str++;
 223                 }
 224         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 225         }
 226
 227 void ERR_free_strings()
 228         {
 229         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 230
 231         if (error_hash != NULL)
 232                 {
 233                 lh_free(error_hash);
 234                 error_hash=NULL;
 235                 }
 236
 237         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 238         }
 239
 240 /********************************************************/
 241
 242 void ERR_put_error(lib,func,reason,file,line)
 243 int lib,func,reason;
 244 char *file;
 245 int line;
 246         {
 247         ERR_STATE *es;
 248
 249         es=ERR_get_state();
 250
 251         es->top=(es->top+1)%ERR_NUM_ERRORS;
 252         if (es->top == es->bottom)
 253                 es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
 254         es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
 255         es->err_file[es->top]=file;
 256         es->err_line[es->top]=line;
 257         err_clear_data(es,es->top);
 258         }
 259
 260 void ERR_clear_error()
 261         {
 262         ERR_STATE *es;
 263
 264         es=ERR_get_state();
 265
 266 #if 0
 267         /* hmm... is this needed */
 268         for (i=0; i<ERR_NUM_ERRORS; i++)
 269                 {
 270                 es->err_buffer[i]=0;
 271                 es->err_file[i]=NULL;
 272                 es->err_line[i]= -1;
 273                 err_clear_data(es,i);
 274                 }
 275 #endif
 276         es->top=es->bottom=0;
 277         }
 278
 279
 280 unsigned long ERR_get_error()
 281         { return(get_error_values(1,NULL,NULL,NULL,NULL)); }
 282
 283 unsigned long ERR_get_error_line(file,line)
 284 char **file;
 285 int *line;
 286         { return(get_error_values(1,file,line,NULL,NULL)); }
 287
 288 unsigned long ERR_get_error_line_data(file,line,data,flags)
 289 char **file;
 290 int *line;
 291 char **data;
 292 int *flags;
 293         { return(get_error_values(1,file,line,data,flags)); }
 294
 295 unsigned long ERR_peek_error()
 296         { return(get_error_values(0,NULL,NULL,NULL,NULL)); }
 297
 298 unsigned long ERR_peek_error_line(file,line)
 299 char **file;
 300 int *line;
 301         { return(get_error_values(0,file,line,NULL,NULL)); }
 302
 303 unsigned long ERR_peek_error_line_data(file,line,data,flags)
 304 char **file;
 305 int *line;
 306 char **data;
 307 int *flags;
 308         { return(get_error_values(0,file,line,data,flags)); }
 309
 310 static unsigned long get_error_values(inc,file,line,data,flags)
 311 int inc;
 312 char **file;
 313 int *line;
 314 char **data;
 315 int *flags;
 316         {
 317         int i=0;
 318         ERR_STATE *es;
 319         unsigned long ret;
 320
 321         es=ERR_get_state();
 322
 323         if (es->bottom == es->top) return(0);
 324         i=(es->bottom+1)%ERR_NUM_ERRORS;
 325
 326         ret=es->err_buffer[i];
 327         if (inc)
 328                 {
 329                 es->bottom=i;
 330                 es->err_buffer[i]=0;
 331                 }
 332
 333         if ((file != NULL) && (line != NULL))
 334                 {
 335                 if (es->err_file[i] == NULL)
 336                         {
 337                         *file="NA";
 338                         if (line != NULL) *line=0;
 339                         }
 340                 else
 341                         {
 342                         *file=es->err_file[i];
 343                         if (line != NULL) *line=es->err_line[i];
 344                         }
 345                 }
 346
 347         if (data != NULL)
 348                 {
 349                 if (es->err_data[i] == NULL)
 350                         {
 351                         *data="";
 352                         if (flags != NULL) *flags=0;
 353                         }
 354                 else
 355                         {
 356                         *data=es->err_data[i];
 357                         if (flags != NULL) *flags=es->err_data_flags[i];
 358                         }
 359                 }
 360         return(ret);
 361         }
 362
 363 /* BAD for multi-threaded, uses a local buffer if ret == NULL */
 364 char *ERR_error_string(e,ret)
 365 unsigned long e;
 366 char *ret;
 367         {
 368         static char buf[256];
 369         char *ls,*fs,*rs;
 370         unsigned long l,f,r;
 371         int i;
 372
 373         l=ERR_GET_LIB(e);
 374         f=ERR_GET_FUNC(e);
 375         r=ERR_GET_REASON(e);
 376
 377         ls=ERR_lib_error_string(e);
 378         fs=ERR_func_error_string(e);
 379         rs=ERR_reason_error_string(e);
 380
 381         if (ret == NULL) ret=buf;
 382
 383         sprintf(&(ret[0]),"error:%08lX:",e);
 384         i=strlen(ret);
 385         if (ls == NULL)
 386                 sprintf(&(ret[i]),":lib(%lu) ",l);
 387         else    sprintf(&(ret[i]),"%s",ls);
 388         i=strlen(ret);
 389         if (fs == NULL)
 390                 sprintf(&(ret[i]),":func(%lu) ",f);
 391         else    sprintf(&(ret[i]),":%s",fs);
 392         i=strlen(ret);
 393         if (rs == NULL)
 394                 sprintf(&(ret[i]),":reason(%lu)",r);
 395         else    sprintf(&(ret[i]),":%s",rs);
 396
 397         return(ret);
 398         }
 399
 400 LHASH *ERR_get_string_table()
 401         {
 402         return(error_hash);
 403         }
 404
 405 LHASH *ERR_get_err_state_table()
 406         {
 407         return(thread_hash);
 408         }
 409
 410 char *ERR_lib_error_string(e)
 411 unsigned long e;
 412         {
 413         ERR_STRING_DATA d,*p=NULL;
 414         unsigned long l;
 415
 416         l=ERR_GET_LIB(e);
 417
 418         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 419
 420         if (error_hash != NULL)
 421                 {
 422                 d.error=ERR_PACK(l,0,0);
 423                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 424                 }
 425
 426         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 427
 428         return((p == NULL)?NULL:p->string);
 429         }
 430
 431 char *ERR_func_error_string(e)
 432 unsigned long e;
 433         {
 434         ERR_STRING_DATA d,*p=NULL;
 435         unsigned long l,f;
 436
 437         l=ERR_GET_LIB(e);
 438         f=ERR_GET_FUNC(e);
 439
 440         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 441
 442         if (error_hash != NULL)
 443                 {
 444                 d.error=ERR_PACK(l,f,0);
 445                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 446                 }
 447
 448         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 449
 450         return((p == NULL)?NULL:p->string);
 451         }
 452
 453 char *ERR_reason_error_string(e)
 454 unsigned long e;
 455         {
 456         ERR_STRING_DATA d,*p=NULL;
 457         unsigned long l,r;
 458
 459         l=ERR_GET_LIB(e);
 460         r=ERR_GET_REASON(e);
 461
 462         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 463
 464         if (error_hash != NULL)
 465                 {
 466                 d.error=ERR_PACK(l,0,r);
 467                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 468                 if (p == NULL)
 469                         {
 470                         d.error=ERR_PACK(0,0,r);
 471                         p=(ERR_STRING_DATA *)lh_retrieve(error_hash,
 472                                 (char *)&d);
 473                         }
 474                 }
 475
 476         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 477
 478         return((p == NULL)?NULL:p->string);
 479         }
 480
 481 static unsigned long err_hash(a)
 482 ERR_STRING_DATA *a;
 483         {
 484         unsigned long ret,l;
 485
 486         l=a->error;
 487         ret=l^ERR_GET_LIB(l)^ERR_GET_FUNC(l);
 488         return(ret^ret%19*13);
 489         }
 490
 491 static int err_cmp(a,b)
 492 ERR_STRING_DATA *a,*b;
 493         {
 494         return((int)(a->error-b->error));
 495         }
 496
 497 static unsigned long pid_hash(a)
 498 ERR_STATE *a;
 499         {
 500         return(a->pid*13);
 501         }
 502
 503 static int pid_cmp(a,b)
 504 ERR_STATE *a,*b;
 505         {
 506         return((int)((long)a->pid - (long)b->pid));
 507         }
 508
 509 void ERR_remove_state(pid)
 510 unsigned long pid;
 511         {
 512         ERR_STATE *p,tmp;
 513
 514         if (thread_hash == NULL)
 515                 return;
 516         if (pid == 0)
 517                 pid=(unsigned long)CRYPTO_thread_id();
 518         tmp.pid=pid;
 519         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 520         p=(ERR_STATE *)lh_delete(thread_hash,(char *)&tmp);
 521         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 522
 523         if (p != NULL) ERR_STATE_free(p);
 524         }
 525
 526 ERR_STATE *ERR_get_state()
 527         {
 528         static ERR_STATE fallback;
 529         ERR_STATE *ret=NULL,tmp,*tmpp;
 530         int i;
 531         unsigned long pid;
 532
 533         pid=(unsigned long)CRYPTO_thread_id();
 534
 535         CRYPTO_r_lock(CRYPTO_LOCK_ERR);
 536         if (thread_hash == NULL)
 537                 {
 538                 CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
 539                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 540                 if (thread_hash == NULL)
 541                         {
 542                         thread_hash=lh_new(pid_hash,pid_cmp);
 543                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 544                         if (thread_hash == NULL) return(&fallback);
 545                         }
 546                 else
 547                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 548                 }
 549         else
 550                 {
 551                 tmp.pid=pid;
 552                 ret=(ERR_STATE *)lh_retrieve(thread_hash,(char *)&tmp);
 553                 CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
 554                 }
 555
 556         /* ret == the error state, if NULL, make a new one */
 557         if (ret == NULL)
 558                 {
 559                 ret=(ERR_STATE *)Malloc(sizeof(ERR_STATE));
 560                 if (ret == NULL) return(&fallback);
 561                 ret->pid=pid;
 562                 ret->top=0;
 563                 ret->bottom=0;
 564                 for (i=0; i<ERR_NUM_ERRORS; i++)
 565                         {
 566                         ret->err_data[i]=NULL;
 567                         ret->err_data_flags[i]=0;
 568                         }
 569                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 570                 tmpp=(ERR_STATE *)lh_insert(thread_hash,(char *)ret);
 571                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 572                 if (tmpp != NULL) /* old entry - should not happen */
 573                         {
 574                         ERR_STATE_free(tmpp);
 575                         }
 576                 }
 577         return(ret);
 578         }
 579
 580 int ERR_get_next_error_library()
 581         {
 582         static int value=ERR_LIB_USER;
 583
 584         return(value++);
 585         }
 586
 587 void ERR_set_error_data(data,flags)
 588 char *data;
 589 int flags;
 590         {
 591         ERR_STATE *es;
 592         int i;
 593
 594         es=ERR_get_state();
 595
 596         i=es->top;
 597         if (i == 0)
 598                 i=ERR_NUM_ERRORS-1;
 599
 600         es->err_data[i]=data;
 601         es->err_data_flags[es->top]=flags;
 602         }
 603
 604 void ERR_add_error_data( VAR_PLIST(int , num))
 605 VAR_ALIST
 606         {
 607         VAR_BDEFN(args, int, num);
 608         int i,n,s;
 609         char *str,*p,*a;
 610
 611         s=64;
 612         str=Malloc(s+1);
 613         if (str == NULL) return;
 614         str[0]='\0';
 615
 616         VAR_INIT(args,int,num);
 617         n=0;
 618         for (i=0; i<num; i++)
 619                 {
 620                 VAR_ARG(args,char *,a);
 621                 n+=strlen(a);
 622                 if (n > s)
 623                         {
 624                         s=n+20;
 625                         p=Realloc(str,s+1);
 626                         if (p == NULL)
 627                                 {
 628                                 Free(str);
 629                                 return;
 630                                 }
 631                         else
 632                                 str=p;
 633                         }
 634                 strcat(str,a);
 635                 }
 636         ERR_set_error_data(str,ERR_TXT_MALLOCED|ERR_TXT_STRING);
 637
 638         VAR_END( args );
 639         }
 640