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 <openssl/lhash.h>
  61 #include <openssl/crypto.h>
  62 #include "cryptlib.h"
  63 #include <openssl/buffer.h>
  64 #include <openssl/err.h>
  65 #include <openssl/crypto.h>
  66
  67
  68 static LHASH *error_hash=NULL;
  69 static LHASH *thread_hash=NULL;
  70
  71 static unsigned long err_hash(ERR_STRING_DATA *a);
  72 static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b);
  73 static unsigned long pid_hash(ERR_STATE *pid);
  74 static int pid_cmp(ERR_STATE *a,ERR_STATE *pid);
  75 static unsigned long get_error_values(int inc,const char **file,int *line,
  76                                       const char **data,int *flags);
  77 static void ERR_STATE_free(ERR_STATE *s);
  78 #ifndef NO_ERR
  79 static ERR_STRING_DATA ERR_str_libraries[]=
  80         {
  81 {ERR_PACK(ERR_LIB_NONE,0,0)             ,"unknown library"},
  82 {ERR_PACK(ERR_LIB_SYS,0,0)              ,"system library"},
  83 {ERR_PACK(ERR_LIB_BN,0,0)               ,"bignum routines"},
  84 {ERR_PACK(ERR_LIB_RSA,0,0)              ,"rsa routines"},
  85 {ERR_PACK(ERR_LIB_DH,0,0)               ,"Diffie-Hellman routines"},
  86 {ERR_PACK(ERR_LIB_EVP,0,0)              ,"digital envelope routines"},
  87 {ERR_PACK(ERR_LIB_BUF,0,0)              ,"memory buffer routines"},
  88 {ERR_PACK(ERR_LIB_BIO,0,0)              ,"BIO routines"},
  89 {ERR_PACK(ERR_LIB_OBJ,0,0)              ,"object identifier routines"},
  90 {ERR_PACK(ERR_LIB_PEM,0,0)              ,"PEM routines"},
  91 {ERR_PACK(ERR_LIB_ASN1,0,0)             ,"asn1 encoding routines"},
  92 {ERR_PACK(ERR_LIB_X509,0,0)             ,"x509 certificate routines"},
  93 {ERR_PACK(ERR_LIB_CONF,0,0)             ,"configuation file routines"},
  94 {ERR_PACK(ERR_LIB_METH,0,0)             ,"X509 lookup 'method' routines"},
  95 {ERR_PACK(ERR_LIB_SSL,0,0)              ,"SSL routines"},
  96 {ERR_PACK(ERR_LIB_RSAREF,0,0)           ,"RSAref routines"},
  97 {ERR_PACK(ERR_LIB_PROXY,0,0)            ,"Proxy routines"},
  98 {ERR_PACK(ERR_LIB_BIO,0,0)              ,"BIO routines"},
  99 {ERR_PACK(ERR_LIB_PKCS7,0,0)            ,"PKCS7 routines"},
 100 {ERR_PACK(ERR_LIB_X509V3,0,0)           ,"X509 V3 routines"},
 101 {ERR_PACK(ERR_LIB_PKCS12,0,0)           ,"PKCS12 routines"},
 102 {0,NULL},
 103         };
 104
 105 static ERR_STRING_DATA ERR_str_functs[]=
 106         {
 107         {ERR_PACK(0,SYS_F_FOPEN,0),             "fopen"},
 108         {ERR_PACK(0,SYS_F_CONNECT,0),           "connect"},
 109         {ERR_PACK(0,SYS_F_GETSERVBYNAME,0),     "getservbyname"},
 110         {ERR_PACK(0,SYS_F_SOCKET,0),            "socket"},
 111         {ERR_PACK(0,SYS_F_IOCTLSOCKET,0),       "ioctlsocket"},
 112         {ERR_PACK(0,SYS_F_BIND,0),              "bind"},
 113         {ERR_PACK(0,SYS_F_LISTEN,0),            "listen"},
 114         {ERR_PACK(0,SYS_F_ACCEPT,0),            "accept"},
 115 #ifdef WINDOWS
 116         {ERR_PACK(0,SYS_F_WSASTARTUP,0),        "WSAstartup"},
 117 #endif
 118         {0,NULL},
 119         };
 120
 121 static ERR_STRING_DATA ERR_str_reasons[]=
 122         {
 123 {ERR_R_FATAL                             ,"fatal"},
 124 {ERR_R_SYS_LIB                          ,"system lib"},
 125 {ERR_R_BN_LIB                           ,"BN lib"},
 126 {ERR_R_RSA_LIB                          ,"RSA lib"},
 127 {ERR_R_DH_LIB                           ,"DH lib"},
 128 {ERR_R_EVP_LIB                          ,"EVP lib"},
 129 {ERR_R_BUF_LIB                          ,"BUF lib"},
 130 {ERR_R_BIO_LIB                          ,"BIO lib"},
 131 {ERR_R_OBJ_LIB                          ,"OBJ lib"},
 132 {ERR_R_PEM_LIB                          ,"PEM lib"},
 133 {ERR_R_X509_LIB                         ,"X509 lib"},
 134 {ERR_R_METH_LIB                         ,"METH lib"},
 135 {ERR_R_ASN1_LIB                         ,"ASN1 lib"},
 136 {ERR_R_CONF_LIB                         ,"CONF lib"},
 137 {ERR_R_SSL_LIB                          ,"SSL lib"},
 138 {ERR_R_PROXY_LIB                        ,"PROXY lib"},
 139 {ERR_R_BIO_LIB                          ,"BIO lib"},
 140 {ERR_R_PKCS7_LIB                        ,"PKCS7 lib"},
 141 {ERR_R_PKCS12_LIB                       ,"PKCS12 lib"},
 142 {ERR_R_MALLOC_FAILURE                   ,"Malloc failure"},
 143 {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED      ,"called a fuction you should not call"},
 144 {ERR_R_PASSED_NULL_PARAMETER            ,"passed a null parameter"},
 145 {ERR_R_NESTED_ASN1_ERROR                ,"nested asn1 error"},
 146 {ERR_R_BAD_ASN1_OBJECT_HEADER           ,"bad asn1 object header"},
 147 {ERR_R_BAD_GET_ASN1_OBJECT_CALL         ,"bad get asn1 object call"},
 148 {ERR_R_EXPECTING_AN_ASN1_SEQUENCE       ,"expecting an asn1 sequence"},
 149 {ERR_R_ASN1_LENGTH_MISMATCH             ,"asn1 length mismatch"},
 150 {ERR_R_MISSING_ASN1_EOS                 ,"missing asn1 eos"},
 151
 152 {0,NULL},
 153         };
 154 #endif
 155
 156 #define err_clear_data(p,i) \
 157         if (((p)->err_data[i] != NULL) && \
 158                 (p)->err_data_flags[i] & ERR_TXT_MALLOCED) \
 159                 {  \
 160                 Free((p)->err_data[i]); \
 161                 (p)->err_data[i]=NULL; \
 162                 } \
 163         (p)->err_data_flags[i]=0;
 164
 165 static void ERR_STATE_free(ERR_STATE *s)
 166         {
 167         int i;
 168
 169         if(s == NULL)
 170             return;
 171
 172         for (i=0; i<ERR_NUM_ERRORS; i++)
 173                 {
 174                 err_clear_data(s,i);
 175                 }
 176         Free(s);
 177         }
 178
 179 void ERR_load_ERR_strings(void)
 180         {
 181         static int init=1;
 182
 183         if (init)
 184                 {
 185                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 186                 if (init == 0)
 187                         {
 188                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 189                         return;
 190                         }
 191                 init=0;
 192                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 193
 194 #ifndef NO_ERR
 195                 ERR_load_strings(0,ERR_str_libraries);
 196                 ERR_load_strings(0,ERR_str_reasons);
 197                 ERR_load_strings(ERR_LIB_SYS,ERR_str_functs);
 198 #endif
 199                 }
 200         }
 201
 202 void ERR_load_strings(int lib, ERR_STRING_DATA *str)
 203         {
 204         if (error_hash == NULL)
 205                 {
 206                 CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
 207                 error_hash=lh_new(err_hash,err_cmp);
 208                 if (error_hash == NULL)
 209                         {
 210                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 211                         return;
 212                         }
 213                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 214
 215                 ERR_load_ERR_strings();
 216                 }
 217
 218         CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
 219         while (str->error)
 220                 {
 221                 str->error|=ERR_PACK(lib,0,0);
 222                 lh_insert(error_hash,(char *)str);
 223                 str++;
 224                 }
 225         CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
 226         }
 227
 228 void ERR_free_strings(void)
 229         {
 230         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 231
 232         if (error_hash != NULL)
 233                 {
 234                 lh_free(error_hash);
 235                 error_hash=NULL;
 236                 }
 237
 238         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 239         }
 240
 241 /********************************************************/
 242
 243 void ERR_put_error(int lib, int func, int reason, const char *file,
 244              int line)
 245         {
 246         ERR_STATE *es;
 247
 248         es=ERR_get_state();
 249
 250         es->top=(es->top+1)%ERR_NUM_ERRORS;
 251         if (es->top == es->bottom)
 252                 es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
 253         es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
 254         es->err_file[es->top]=file;
 255         es->err_line[es->top]=line;
 256         err_clear_data(es,es->top);
 257         }
 258
 259 void ERR_clear_error(void)
 260         {
 261         ERR_STATE *es;
 262
 263         es=ERR_get_state();
 264
 265 #if 0
 266         /* hmm... is this needed */
 267         for (i=0; i<ERR_NUM_ERRORS; i++)
 268                 {
 269                 es->err_buffer[i]=0;
 270                 es->err_file[i]=NULL;
 271                 es->err_line[i]= -1;
 272                 err_clear_data(es,i);
 273                 }
 274 #endif
 275         es->top=es->bottom=0;
 276         }
 277
 278
 279 unsigned long ERR_get_error(void)
 280         { return(get_error_values(1,NULL,NULL,NULL,NULL)); }
 281
 282 unsigned long ERR_get_error_line(const char **file,
 283              int *line)
 284         { return(get_error_values(1,file,line,NULL,NULL)); }
 285
 286 unsigned long ERR_get_error_line_data(const char **file, int *line,
 287              const char **data, int *flags)
 288         { return(get_error_values(1,file,line,
 289              data,flags)); }
 290
 291 unsigned long ERR_peek_error(void)
 292         { return(get_error_values(0,NULL,NULL,NULL,NULL)); }
 293
 294 unsigned long ERR_peek_error_line(const char **file,
 295              int *line)
 296         { return(get_error_values(0,file,line,NULL,NULL)); }
 297
 298 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 299              const char **data, int *flags)
 300         { return(get_error_values(0,file,line,
 301              data,flags)); }
 302
 303 static unsigned long get_error_values(int inc, const char **file, int *line,
 304              const char **data, int *flags)
 305         {
 306         int i=0;
 307         ERR_STATE *es;
 308         unsigned long ret;
 309
 310         es=ERR_get_state();
 311
 312         if (es->bottom == es->top) return(0);
 313         i=(es->bottom+1)%ERR_NUM_ERRORS;
 314
 315         ret=es->err_buffer[i];
 316         if (inc)
 317                 {
 318                 es->bottom=i;
 319                 es->err_buffer[i]=0;
 320                 }
 321
 322         if ((file != NULL) && (line != NULL))
 323                 {
 324                 if (es->err_file[i] == NULL)
 325                         {
 326                         *file="NA";
 327                         if (line != NULL) *line=0;
 328                         }
 329                 else
 330                         {
 331                         *file=es->err_file[i];
 332                         if (line != NULL) *line=es->err_line[i];
 333                         }
 334                 }
 335
 336         if (data != NULL)
 337                 {
 338                 if (es->err_data[i] == NULL)
 339                         {
 340                         *data="";
 341                         if (flags != NULL) *flags=0;
 342                         }
 343                 else
 344                         {
 345                         *data=es->err_data[i];
 346                         if (flags != NULL) *flags=es->err_data_flags[i];
 347                         }
 348                 }
 349         return(ret);
 350         }
 351
 352 /* BAD for multi-threaded, uses a local buffer if ret == NULL */
 353 char *ERR_error_string(unsigned long e, char *ret)
 354         {
 355         static char buf[256];
 356         const char *ls,*fs,*rs;
 357         unsigned long l,f,r;
 358         int i;
 359
 360         l=ERR_GET_LIB(e);
 361         f=ERR_GET_FUNC(e);
 362         r=ERR_GET_REASON(e);
 363
 364         ls=ERR_lib_error_string(e);
 365         fs=ERR_func_error_string(e);
 366         rs=ERR_reason_error_string(e);
 367
 368         if (ret == NULL) ret=buf;
 369
 370         sprintf(&(ret[0]),"error:%08lX:",e);
 371         i=strlen(ret);
 372         if (ls == NULL)
 373                 sprintf(&(ret[i]),":lib(%lu) ",l);
 374         else    sprintf(&(ret[i]),"%s",ls);
 375         i=strlen(ret);
 376         if (fs == NULL)
 377                 sprintf(&(ret[i]),":func(%lu) ",f);
 378         else    sprintf(&(ret[i]),":%s",fs);
 379         i=strlen(ret);
 380         if (rs == NULL)
 381                 sprintf(&(ret[i]),":reason(%lu)",r);
 382         else    sprintf(&(ret[i]),":%s",rs);
 383
 384         return(ret);
 385         }
 386
 387 LHASH *ERR_get_string_table(void)
 388         {
 389         return(error_hash);
 390         }
 391
 392 LHASH *ERR_get_err_state_table(void)
 393         {
 394         return(thread_hash);
 395         }
 396
 397 const char *ERR_lib_error_string(unsigned long e)
 398         {
 399         ERR_STRING_DATA d,*p=NULL;
 400         unsigned long l;
 401
 402         l=ERR_GET_LIB(e);
 403
 404         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 405
 406         if (error_hash != NULL)
 407                 {
 408                 d.error=ERR_PACK(l,0,0);
 409                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 410                 }
 411
 412         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 413
 414         return((p == NULL)?NULL:p->string);
 415         }
 416
 417 const char *ERR_func_error_string(unsigned long e)
 418         {
 419         ERR_STRING_DATA d,*p=NULL;
 420         unsigned long l,f;
 421
 422         l=ERR_GET_LIB(e);
 423         f=ERR_GET_FUNC(e);
 424
 425         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 426
 427         if (error_hash != NULL)
 428                 {
 429                 d.error=ERR_PACK(l,f,0);
 430                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 431                 }
 432
 433         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 434
 435         return((p == NULL)?NULL:p->string);
 436         }
 437
 438 const char *ERR_reason_error_string(unsigned long e)
 439         {
 440         ERR_STRING_DATA d,*p=NULL;
 441         unsigned long l,r;
 442
 443         l=ERR_GET_LIB(e);
 444         r=ERR_GET_REASON(e);
 445
 446         CRYPTO_r_lock(CRYPTO_LOCK_ERR_HASH);
 447
 448         if (error_hash != NULL)
 449                 {
 450                 d.error=ERR_PACK(l,0,r);
 451                 p=(ERR_STRING_DATA *)lh_retrieve(error_hash,(char *)&d);
 452                 if (p == NULL)
 453                         {
 454                         d.error=ERR_PACK(0,0,r);
 455                         p=(ERR_STRING_DATA *)lh_retrieve(error_hash,
 456                                 (char *)&d);
 457                         }
 458                 }
 459
 460         CRYPTO_r_unlock(CRYPTO_LOCK_ERR_HASH);
 461
 462         return((p == NULL)?NULL:p->string);
 463         }
 464
 465 static unsigned long err_hash(ERR_STRING_DATA *a)
 466         {
 467         unsigned long ret,l;
 468
 469         l=a->error;
 470         ret=l^ERR_GET_LIB(l)^ERR_GET_FUNC(l);
 471         return(ret^ret%19*13);
 472         }
 473
 474 static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b)
 475         {
 476         return((int)(a->error-b->error));
 477         }
 478
 479 static unsigned long pid_hash(ERR_STATE *a)
 480         {
 481         return(a->pid*13);
 482         }
 483
 484 static int pid_cmp(ERR_STATE *a, ERR_STATE *b)
 485         {
 486         return((int)((long)a->pid - (long)b->pid));
 487         }
 488
 489 void ERR_remove_state(unsigned long pid)
 490         {
 491         ERR_STATE *p,tmp;
 492
 493         if (thread_hash == NULL)
 494                 return;
 495         if (pid == 0)
 496                 pid=(unsigned long)CRYPTO_thread_id();
 497         tmp.pid=pid;
 498         CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 499         p=(ERR_STATE *)lh_delete(thread_hash,(char *)&tmp);
 500         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 501
 502         if (p != NULL) ERR_STATE_free(p);
 503         }
 504
 505 ERR_STATE *ERR_get_state(void)
 506         {
 507         static ERR_STATE fallback;
 508         ERR_STATE *ret=NULL,tmp,*tmpp;
 509         int i;
 510         unsigned long pid;
 511
 512         pid=(unsigned long)CRYPTO_thread_id();
 513
 514         CRYPTO_r_lock(CRYPTO_LOCK_ERR);
 515         if (thread_hash == NULL)
 516                 {
 517                 CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
 518                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 519                 if (thread_hash == NULL)
 520                         {
 521                         MemCheck_off();
 522                         thread_hash=lh_new(pid_hash,pid_cmp);
 523                         MemCheck_on();
 524                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 525                         if (thread_hash == NULL) return(&fallback);
 526                         }
 527                 else
 528                         CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 529                 }
 530         else
 531                 {
 532                 tmp.pid=pid;
 533                 ret=(ERR_STATE *)lh_retrieve(thread_hash,(char *)&tmp);
 534                 CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
 535                 }
 536
 537         /* ret == the error state, if NULL, make a new one */
 538         if (ret == NULL)
 539                 {
 540                 ret=(ERR_STATE *)Malloc(sizeof(ERR_STATE));
 541                 if (ret == NULL) return(&fallback);
 542                 ret->pid=pid;
 543                 ret->top=0;
 544                 ret->bottom=0;
 545                 for (i=0; i<ERR_NUM_ERRORS; i++)
 546                         {
 547                         ret->err_data[i]=NULL;
 548                         ret->err_data_flags[i]=0;
 549                         }
 550                 CRYPTO_w_lock(CRYPTO_LOCK_ERR);
 551                 tmpp=(ERR_STATE *)lh_insert(thread_hash,(char *)ret);
 552                 CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
 553                 if (tmpp != NULL) /* old entry - should not happen */
 554                         {
 555                         ERR_STATE_free(tmpp);
 556                         }
 557                 }
 558         return(ret);
 559         }
 560
 561 int ERR_get_next_error_library(void)
 562         {
 563         static int value=ERR_LIB_USER;
 564
 565         return(value++);
 566         }
 567
 568 void ERR_set_error_data(char *data, int flags)
 569         {
 570         ERR_STATE *es;
 571         int i;
 572
 573         es=ERR_get_state();
 574
 575         i=es->top;
 576         if (i == 0)
 577                 i=ERR_NUM_ERRORS-1;
 578
 579         es->err_data[i]=data;
 580         es->err_data_flags[es->top]=flags;
 581         }
 582
 583 void ERR_add_error_data( VAR_PLIST(int , num))
 584 VAR_ALIST
 585         {
 586         VAR_BDEFN(args, int, num);
 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         VAR_INIT(args,int,num);
 596         n=0;
 597         for (i=0; i<num; i++)
 598                 {
 599                 VAR_ARG(args,char *,a);
 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         VAR_END( args );
 622         }
 623