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 <stdarg.h>
  61 #include <openssl/lhash.h>
  62 #include <openssl/crypto.h>
  63 #include "cryptlib.h"
  64 #include <openssl/buffer.h>
  65 #include <openssl/err.h>
  66 #include <openssl/crypto.h>
  67
  68
  69 static LHASH *error_hash=NULL;
  70 static LHASH *thread_hash=NULL;
  71
  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,const char **file,int *line,
  77                                       const char **data,int *flags);
  78 static void ERR_STATE_free(ERR_STATE *s);
  79 #ifndef NO_ERR
  80 static ERR_STRING_DATA ERR_str_libraries[]=
  81         {
  82 {ERR_PACK(ERR_LIB_NONE,0,0)             ,"unknown library"},
  83 {ERR_PACK(ERR_LIB_SYS,0,0)              ,"system library"},
  84 {ERR_PACK(ERR_LIB_BN,0,0)               ,"bignum routines"},
  85 {ERR_PACK(ERR_LIB_RSA,0,0)              ,"rsa routines"},
  86 {ERR_PACK(ERR_LIB_DH,0,0)               ,"Diffie-Hellman routines"},
  87 {ERR_PACK(ERR_LIB_EVP,0,0)              ,"digital envelope routines"},
  88 {ERR_PACK(ERR_LIB_BUF,0,0)              ,"memory buffer routines"},
  89 {ERR_PACK(ERR_LIB_BIO,0,0)              ,"BIO routines"},
  90 {ERR_PACK(ERR_LIB_OBJ,0,0)              ,"object identifier routines"},
  91 {ERR_PACK(ERR_LIB_PEM,0,0)              ,"PEM routines"},
  92 {ERR_PACK(ERR_LIB_ASN1,0,0)             ,"asn1 encoding routines"},
  93 {ERR_PACK(ERR_LIB_X509,0,0)             ,"x509 certificate routines"},
  94 {ERR_PACK(ERR_LIB_CONF,0,0)             ,"configuation file routines"},
  95 {ERR_PACK(ERR_LIB_METH,0,0)             ,"X509 lookup 'method' routines"},
  96 {ERR_PACK(ERR_LIB_SSL,0,0)              ,"SSL routines"},
  97 {ERR_PACK(ERR_LIB_RSAREF,0,0)           ,"RSAref routines"},
  98 {ERR_PACK(ERR_LIB_PROXY,0,0)            ,"Proxy routines"},
  99 {ERR_PACK(ERR_LIB_BIO,0,0)              ,"BIO routines"},
 100 {ERR_PACK(ERR_LIB_PKCS7,0,0)            ,"PKCS7 routines"},
 101 {ERR_PACK(ERR_LIB_X509V3,0,0)           ,"X509 V3 routines"},
 102 {ERR_PACK(ERR_LIB_PKCS12,0,0)           ,"PKCS12 routines"},
 103 {0,NULL},
 104         };
 105
 106 static ERR_STRING_DATA ERR_str_functs[]=
 107         {
 108         {ERR_PACK(0,SYS_F_FOPEN,0),             "fopen"},
 109         {ERR_PACK(0,SYS_F_CONNECT,0),           "connect"},
 110         {ERR_PACK(0,SYS_F_GETSERVBYNAME,0),     "getservbyname"},
 111         {ERR_PACK(0,SYS_F_SOCKET,0),            "socket"},
 112         {ERR_PACK(0,SYS_F_IOCTLSOCKET,0),       "ioctlsocket"},
 113         {ERR_PACK(0,SYS_F_BIND,0),              "bind"},
 114         {ERR_PACK(0,SYS_F_LISTEN,0),            "listen"},
 115         {ERR_PACK(0,SYS_F_ACCEPT,0),            "accept"},
 116 #ifdef WINDOWS
 117         {ERR_PACK(0,SYS_F_WSASTARTUP,0),        "WSAstartup"},
 118 #endif
 119         {0,NULL},
 120         };
 121
 122 static ERR_STRING_DATA ERR_str_reasons[]=
 123         {
 124 {ERR_R_FATAL                             ,"fatal"},
 125 {ERR_R_SYS_LIB                          ,"system lib"},
 126 {ERR_R_BN_LIB                           ,"BN lib"},
 127 {ERR_R_RSA_LIB                          ,"RSA lib"},
 128 {ERR_R_DH_LIB                           ,"DH lib"},
 129 {ERR_R_EVP_LIB                          ,"EVP lib"},
 130 {ERR_R_BUF_LIB                          ,"BUF lib"},
 131 {ERR_R_BIO_LIB                          ,"BIO lib"},
 132 {ERR_R_OBJ_LIB                          ,"OBJ lib"},
 133 {ERR_R_PEM_LIB                          ,"PEM lib"},
 134 {ERR_R_X509_LIB                         ,"X509 lib"},
 135 {ERR_R_METH_LIB                         ,"METH lib"},
 136 {ERR_R_ASN1_LIB                         ,"ASN1 lib"},
 137 {ERR_R_CONF_LIB                         ,"CONF lib"},
 138 {ERR_R_SSL_LIB                          ,"SSL lib"},
 139 {ERR_R_PROXY_LIB                        ,"PROXY lib"},
 140 {ERR_R_BIO_LIB                          ,"BIO lib"},
 141 {ERR_R_PKCS7_LIB                        ,"PKCS7 lib"},
 142 {ERR_R_PKCS12_LIB                       ,"PKCS12 lib"},
 143 {ERR_R_MALLOC_FAILURE                   ,"Malloc failure"},
 144 {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED      ,"called a fuction you should not call"},
 145 {ERR_R_PASSED_NULL_PARAMETER            ,"passed a null parameter"},
 146 {ERR_R_NESTED_ASN1_ERROR                ,"nested asn1 error"},
 147 {ERR_R_BAD_ASN1_OBJECT_HEADER           ,"bad asn1 object header"},
 148 {ERR_R_BAD_GET_ASN1_OBJECT_CALL         ,"bad get asn1 object call"},
 149 {ERR_R_EXPECTING_AN_ASN1_SEQUENCE       ,"expecting an asn1 sequence"},
 150 {ERR_R_ASN1_LENGTH_MISMATCH             ,"asn1 length mismatch"},
 151 {ERR_R_MISSING_ASN1_EOS                 ,"missing asn1 eos"},
 152
 153 {0,NULL},
 154         };
 155 #endif
 156
 157 #define err_clear_data(p,i) \
 158         if (((p)->err_data[i] != NULL) && \
 159                 (p)->err_data_flags[i] & ERR_TXT_MALLOCED) \
 160                 {  \
 161                 Free((p)->err_data[i]); \
 162                 (p)->err_data[i]=NULL; \
 163                 } \
 164         (p)->err_data_flags[i]=0;
 165
 166 static void ERR_STATE_free(ERR_STATE *s)
 167         {
 168         int i;
 169
 170         if(s == NULL)
 171             return;
 172
 173         for (i=0; i<ERR_NUM_ERRORS; i++)
 174                 {
 175                 err_clear_data(s,i);
 176                 }
 177         Free(s);
 178         }
 179
 180 void ERR_load_ERR_strings(void)
 181         {
 182         static int init=1;
 183
 184         if (init)
 185                 {
 186                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 187                 if (init == 0)
 188                         {
 189                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 190                         return;
 191                         }
 192                 init=0;
 193                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 194
 195 #ifndef NO_ERR
 196                 ERR_load_strings(0,ERR_str_libraries);
 197                 ERR_load_strings(0,ERR_str_reasons);
 198                 ERR_load_strings(ERR_LIB_SYS,ERR_str_functs);
 199 #endif
 200                 }
 201         }
 202
 203 void ERR_load_strings(int lib, ERR_STRING_DATA *str)
 204         {
 205         if (error_hash == NULL)
 206                 {
 207                 CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
 208                 error_hash=lh_new(err_hash,err_cmp);
 209                 if (error_hash == NULL)
 210                         {
 211                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 212                         return;
 213                         }
 214                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 215
 216                 ERR_load_ERR_strings();
 217                 }
 218
 219         CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
 220         while (str->error)
 221                 {
 222                 str->error|=ERR_PACK(lib,0,0);
 223                 lh_insert(error_hash,(char *)str);
 224                 str++;
 225                 }
 226         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 227         }
 228
 229 void ERR_free_strings(void)
 230         {
 231         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 232
 233         if (error_hash != NULL)
 234                 {
 235                 lh_free(error_hash);
 236                 error_hash=NULL;
 237                 }
 238
 239         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 240         }
 241
 242 /********************************************************/
 243
 244 void ERR_put_error(int lib, int func, int reason, const 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(void)
 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(void)
 281         { return(get_error_values(1,NULL,NULL,NULL,NULL)); }
 282
 283 unsigned long ERR_get_error_line(const char **file,
 284              int *line)
 285         { return(get_error_values(1,file,line,NULL,NULL)); }
 286
 287 unsigned long ERR_get_error_line_data(const char **file, int *line,
 288              const char **data, int *flags)
 289         { return(get_error_values(1,file,line,
 290              data,flags)); }
 291
 292 unsigned long ERR_peek_error(void)
 293         { return(get_error_values(0,NULL,NULL,NULL,NULL)); }
 294
 295 unsigned long ERR_peek_error_line(const char **file,
 296              int *line)
 297         { return(get_error_values(0,file,line,NULL,NULL)); }
 298
 299 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 300              const char **data, int *flags)
 301         { return(get_error_values(0,file,line,
 302              data,flags)); }
 303
 304 static unsigned long get_error_values(int inc, const char **file, int *line,
 305              const char **data, int *flags)
 306         {
 307         int i=0;
 308         ERR_STATE *es;
 309         unsigned long ret;
 310
 311         es=ERR_get_state();
 312
 313         if (es->bottom == es->top) return(0);
 314         i=(es->bottom+1)%ERR_NUM_ERRORS;
 315
 316         ret=es->err_buffer[i];
 317         if (inc)
 318                 {
 319                 es->bottom=i;
 320                 es->err_buffer[i]=0;
 321                 }
 322
 323         if ((file != NULL) && (line != NULL))
 324                 {
 325                 if (es->err_file[i] == NULL)
 326                         {
 327                         *file="NA";
 328                         if (line != NULL) *line=0;
 329                         }
 330                 else
 331                         {
 332                         *file=es->err_file[i];
 333                         if (line != NULL) *line=es->err_line[i];
 334                         }
 335                 }
 336
 337         if (data != NULL)
 338                 {
 339                 if (es->err_data[i] == NULL)
 340                         {
 341                         *data="";
 342                         if (flags != NULL) *flags=0;
 343                         }
 344                 else
 345                         {
 346                         *data=es->err_data[i];
 347                         if (flags != NULL) *flags=es->err_data_flags[i];
 348                         }
 349                 }
 350         return(ret);
 351         }
 352
 353 /* BAD for multi-threaded, uses a local buffer if ret == NULL */
 354 char *ERR_error_string(unsigned long e, char *ret)
 355         {
 356         static char buf[256];
 357         const char *ls,*fs,*rs;
 358         unsigned long l,f,r;
 359         int i;
 360
 361         l=ERR_GET_LIB(e);
 362         f=ERR_GET_FUNC(e);
 363         r=ERR_GET_REASON(e);
 364
 365         ls=ERR_lib_error_string(e);
 366         fs=ERR_func_error_string(e);
 367         rs=ERR_reason_error_string(e);
 368
 369         if (ret == NULL) ret=buf;
 370
 371         sprintf(&(ret[0]),"error:%08lX:",e);
 372         i=strlen(ret);
 373         if (ls == NULL)
 374                 sprintf(&(ret[i]),":lib(%lu) ",l);
 375         else    sprintf(&(ret[i]),"%s",ls);
 376         i=strlen(ret);
 377         if (fs == NULL)
 378                 sprintf(&(ret[i]),":func(%lu) ",f);
 379         else    sprintf(&(ret[i]),":%s",fs);
 380         i=strlen(ret);
 381         if (rs == NULL)
 382                 sprintf(&(ret[i]),":reason(%lu)",r);
 383         else    sprintf(&(ret[i]),":%s",rs);
 384
 385         return(ret);
 386         }
 387
 388 LHASH *ERR_get_string_table(void)
 389         {
 390         return(error_hash);
 391         }
 392
 393 LHASH *ERR_get_err_state_table(void)
 394         {
 395         return(thread_hash);
 396         }
 397
 398 const char *ERR_lib_error_string(unsigned long e)
 399         {
 400         ERR_STRING_DATA d,*p=NULL;
 401         unsigned long l;
 402
 403         l=ERR_GET_LIB(e);
 404
 405         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 406
 407         if (error_hash != NULL)
 408                 {
 409                 d.error=ERR_PACK(l,0,0);
 410                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 411                 }
 412
 413         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 414
 415         return((p == NULL)?NULL:p->string);
 416         }
 417
 418 const char *ERR_func_error_string(unsigned long e)
 419         {
 420         ERR_STRING_DATA d,*p=NULL;
 421         unsigned long l,f;
 422
 423         l=ERR_GET_LIB(e);
 424         f=ERR_GET_FUNC(e);
 425
 426         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 427
 428         if (error_hash != NULL)
 429                 {
 430                 d.error=ERR_PACK(l,f,0);
 431                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 432                 }
 433
 434         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 435
 436         return((p == NULL)?NULL:p->string);
 437         }
 438
 439 const char *ERR_reason_error_string(unsigned long e)
 440         {
 441         ERR_STRING_DATA d,*p=NULL;
 442         unsigned long l,r;
 443
 444         l=ERR_GET_LIB(e);
 445         r=ERR_GET_REASON(e);
 446
 447         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 448
 449         if (error_hash != NULL)
 450                 {
 451                 d.error=ERR_PACK(l,0,r);
 452                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 453                 if (p == NULL)
 454                         {
 455                         d.error=ERR_PACK(0,0,r);
 456                         p=(ERR_STRING_DATA *)lh_retrieve(error_hash,
 457                                 (char *)&d);
 458                         }
 459                 }
 460
 461         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 462
 463         return((p == NULL)?NULL:p->string);
 464         }
 465
 466 static unsigned long err_hash(ERR_STRING_DATA *a)
 467         {
 468         unsigned long ret,l;
 469
 470         l=a->error;
 471         ret=l^ERR_GET_LIB(l)^ERR_GET_FUNC(l);
 472         return(ret^ret%19*13);
 473         }
 474
 475 static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b)
 476         {
 477         return((int)(a->error-b->error));
 478         }
 479
 480 static unsigned long pid_hash(ERR_STATE *a)
 481         {
 482         return(a->pid*13);
 483         }
 484
 485 static int pid_cmp(ERR_STATE *a, ERR_STATE *b)
 486         {
 487         return((int)((long)a->pid - (long)b->pid));
 488         }
 489
 490 void ERR_remove_state(unsigned long pid)
 491         {
 492         ERR_STATE *p,tmp;
 493
 494         if (thread_hash == NULL)
 495                 return;
 496         if (pid == 0)
 497                 pid=(unsigned long)CRYPTO_thread_id();
 498         tmp.pid=pid;
 499         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 500         p=(ERR_STATE *)lh_delete(thread_hash,(char *)&tmp);
 501         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 502
 503         if (p != NULL) ERR_STATE_free(p);
 504         }
 505
 506 ERR_STATE *ERR_get_state(void)
 507         {
 508         static ERR_STATE fallback;
 509         ERR_STATE *ret=NULL,tmp,*tmpp;
 510         int i;
 511         unsigned long pid;
 512
 513         pid=(unsigned long)CRYPTO_thread_id();
 514
 515         CRYPTO_r_lock(CRYPTO_LOCK_ERR);
 516         if (thread_hash == NULL)
 517                 {
 518                 CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
 519                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 520                 if (thread_hash == NULL)
 521                         {
 522                         MemCheck_off();
 523                         thread_hash=lh_new(pid_hash,pid_cmp);
 524                         MemCheck_on();
 525                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 526                         if (thread_hash == NULL) return(&fallback);
 527                         }
 528                 else
 529                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 530                 }
 531         else
 532                 {
 533                 tmp.pid=pid;
 534                 ret=(ERR_STATE *)lh_retrieve(thread_hash,(char *)&tmp);
 535                 CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
 536                 }
 537
 538         /* ret == the error state, if NULL, make a new one */
 539         if (ret == NULL)
 540                 {
 541                 ret=(ERR_STATE *)Malloc(sizeof(ERR_STATE));
 542                 if (ret == NULL) return(&fallback);
 543                 ret->pid=pid;
 544                 ret->top=0;
 545                 ret->bottom=0;
 546                 for (i=0; i<ERR_NUM_ERRORS; i++)
 547                         {
 548                         ret->err_data[i]=NULL;
 549                         ret->err_data_flags[i]=0;
 550                         }
 551                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 552                 tmpp=(ERR_STATE *)lh_insert(thread_hash,(char *)ret);
 553                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 554                 if (tmpp != NULL) /* old entry - should not happen */
 555                         {
 556                         ERR_STATE_free(tmpp);
 557                         }
 558                 }
 559         return(ret);
 560         }
 561
 562 int ERR_get_next_error_library(void)
 563         {
 564         static int value=ERR_LIB_USER;
 565
 566         return(value++);
 567         }
 568
 569 void ERR_set_error_data(char *data, int flags)
 570         {
 571         ERR_STATE *es;
 572         int i;
 573
 574         es=ERR_get_state();
 575
 576         i=es->top;
 577         if (i == 0)
 578                 i=ERR_NUM_ERRORS-1;
 579
 580         es->err_data[i]=data;
 581         es->err_data_flags[es->top]=flags;
 582         }
 583
 584 void ERR_add_error_data(int num, ...)
 585         {
 586         va_list args;
 587         int i,n,s;
 588         char *str,*p,*a;
 589
 590         s=64;
 591         str=Malloc(s+1);
 592         if (str == NULL) return;
 593         str[0]='\0';
 594
 595         va_start(args, num);
 596         n=0;
 597         for (i=0; i<num; i++)
 598                 {
 599                 a=va_arg(args, char*);
 600                 /* ignore NULLs, thanks to Bob Beck <beck@obtuse.com> */
 601                 if (a != NULL)
 602                         {
 603                         n+=strlen(a);
 604                         if (n > s)
 605                                 {
 606                                 s=n+20;
 607                                 p=Realloc(str,s+1);
 608                                 if (p == NULL)
 609                                         {
 610                                         Free(str);
 611                                         return;
 612                                         }
 613                                 else
 614                                         str=p;
 615                                 }
 616                         strcat(str,a);
 617                         }
 618                 }
 619         ERR_set_error_data(str,ERR_TXT_MALLOCED|ERR_TXT_STRING);
 620
 621         va_end(args);
 622         }
 623