libcitadel/lib/stringbuf.c

   1
   2 #include <errno.h>
   3 #include <string.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <stdio.h>
   7 #include "libcitadel.h"
   8
   9 #include <stdarg.h>
  10
  11 struct StrBuf {
  12         char *buf;
  13         long BufSize;
  14         long BufUsed;
  15         int ConstBuf;
  16 };
  17
  18
  19 inline const char *ChrPtr(StrBuf *Str)
  20 {
  21         if (Str == NULL)
  22                 return "";
  23         return Str->buf;
  24 }
  25
  26 inline int StrLength(StrBuf *Str)
  27 {
  28         return Str->BufUsed;
  29 }
  30
  31 StrBuf* NewStrBuf(void)
  32 {
  33         StrBuf *NewBuf;
  34
  35         NewBuf = (StrBuf*) malloc(sizeof(StrBuf));
  36         NewBuf->buf = (char*) malloc(SIZ);
  37         NewBuf->buf[0] = '\0';
  38         NewBuf->BufSize = SIZ;
  39         NewBuf->BufUsed = 0;
  40         NewBuf->ConstBuf = 0;
  41         return NewBuf;
  42 }
  43
  44
  45 StrBuf* NewStrBufPlain(const char* ptr, int nChars)
  46 {
  47         StrBuf *NewBuf;
  48         size_t Siz = SIZ;
  49         size_t CopySize;
  50
  51         NewBuf = (StrBuf*) malloc(sizeof(StrBuf));
  52         if (nChars < 0)
  53                 CopySize = strlen(ptr);
  54         else
  55                 CopySize = nChars;
  56
  57         while (Siz <= CopySize)
  58                 Siz *= 2;
  59
  60         NewBuf->buf = (char*) malloc(Siz);
  61         memcpy(NewBuf->buf, ptr, CopySize);
  62         NewBuf->buf[CopySize] = '\0';
  63         NewBuf->BufSize = Siz;
  64         NewBuf->BufUsed = CopySize;
  65         NewBuf->ConstBuf = 0;
  66         return NewBuf;
  67 }
  68
  69 StrBuf* _NewConstStrBuf(const char* StringConstant, size_t SizeOfStrConstant)
  70 {
  71         StrBuf *NewBuf;
  72
  73         NewBuf = (StrBuf*) malloc(sizeof(StrBuf));
  74         NewBuf->buf = (char*) StringConstant;
  75         NewBuf->BufSize = SizeOfStrConstant;
  76         NewBuf->BufUsed = SizeOfStrConstant;
  77         NewBuf->ConstBuf = 1;
  78         return NewBuf;
  79 }
  80
  81
  82 static int IncreaseBuf(StrBuf *Buf, int KeepOriginal, int DestSize)
  83 {
  84         char *NewBuf;
  85         size_t NewSize = Buf->BufSize * 2;
  86
  87         if (Buf->ConstBuf)
  88                 return -1;
  89
  90         if (DestSize > 0)
  91                 while (NewSize < DestSize)
  92                         NewSize *= 2;
  93
  94         NewBuf= (char*) malloc(NewSize);
  95         if (KeepOriginal)
  96         {
  97                 memcpy(NewBuf, Buf->buf, Buf->BufUsed);
  98         }
  99         else
 100         {
 101                 NewBuf[0] = '\0';
 102                 Buf->BufUsed = 0;
 103         }
 104         free (Buf->buf);
 105         Buf->buf = NewBuf;
 106         Buf->BufSize *= 2;
 107         return Buf->BufSize;
 108 }
 109
 110 int FlushStrBuf(StrBuf *buf)
 111 {
 112         if (buf->ConstBuf)
 113                 return -1;
 114         buf->buf[0] ='\0';
 115         buf->BufUsed = 0;
 116         return 0;
 117 }
 118
 119 void FreeStrBuf (StrBuf **FreeMe)
 120 {
 121         if (!(*FreeMe)->ConstBuf)
 122                 free((*FreeMe)->buf);
 123         free(*FreeMe);
 124         *FreeMe = NULL;
 125 }
 126
 127 void HFreeStrBuf (void *VFreeMe)
 128 {
 129         StrBuf *FreeMe = (StrBuf*)VFreeMe;
 130         if (!FreeMe->ConstBuf)
 131                 free(FreeMe->buf);
 132         free(FreeMe);
 133 }
 134
 135 long StrTol(StrBuf *Buf)
 136 {
 137         if(Buf->BufUsed > 0)
 138                 return atol(Buf->buf);
 139         else
 140                 return 0;
 141 }
 142
 143
 144 void StrBufAppendBuf(StrBuf *Buf, StrBuf *AppendBuf, size_t Offset)
 145 {
 146         if ((AppendBuf == NULL) || (Buf == NULL))
 147                 return;
 148         if (Buf->BufSize - Offset < AppendBuf->BufUsed)
 149                 IncreaseBuf(Buf, (Buf->BufUsed > 0), AppendBuf->BufUsed);
 150         memcpy(Buf->buf + Buf->BufUsed - 1,
 151                AppendBuf->buf + Offset,
 152                AppendBuf->BufUsed - Offset);
 153         Buf->BufUsed += AppendBuf->BufUsed - Offset;
 154         Buf->buf[Buf->BufUsed] = '\0';
 155 }
 156
 157
 158 inline int StrBufNum_tokens(const StrBuf *source, char tok)
 159 {
 160         return num_tokens(source->buf, tok);
 161 }
 162
 163
 164 int StrBufSub(StrBuf *dest, const StrBuf *Source, size_t Offset, size_t nChars)
 165 {
 166         size_t NCharsRemain;
 167         if (Offset > Source->BufUsed)
 168         {
 169                 FlushStrBuf(dest);
 170                 return 0;
 171         }
 172         if (Offset + nChars < Source->BufUsed)
 173         {
 174                 if (nChars < dest->BufSize)
 175                         IncreaseBuf(dest, 0, nChars + 1);
 176                 memcpy(dest->buf, Source->buf + Offset, nChars);
 177                 dest->BufUsed = nChars + 1;
 178                 dest->buf[dest->BufUsed] = '\0';
 179                 return nChars;
 180         }
 181         NCharsRemain = Source->BufUsed - Offset;
 182         if (NCharsRemain < dest->BufSize)
 183                 IncreaseBuf(dest, 0, NCharsRemain + 1);
 184         memcpy(dest->buf, Source->buf + Offset, NCharsRemain);
 185         dest->BufUsed = NCharsRemain + 1;
 186         dest->buf[dest->BufUsed] = '\0';
 187         return NCharsRemain;
 188 }
 189
 190 void StrBufPrintf(StrBuf *Buf, const char *format, ...)
 191 {
 192         size_t nWritten = Buf->BufSize + 1;
 193         va_list arg_ptr;
 194
 195         while (nWritten >= Buf->BufSize) {
 196                 va_start(arg_ptr, format);
 197                 nWritten = vsnprintf(Buf->buf, Buf->BufSize, format, arg_ptr);
 198                 va_end(arg_ptr);
 199                 Buf->BufUsed = nWritten ;
 200                 if (nWritten >= Buf->BufSize)
 201                         IncreaseBuf(Buf, 0, 0);
 202         }
 203 }
 204
 205
 206 /**
 207  * \brief a string tokenizer
 208  * \param dest Destination StringBuffer
 209  * \param Source StringBuffer to read into
 210  * \param separator tokenizer param
 211  * \returns -1 if not found, else length of token.
 212  */
 213 int StrBufExtract_token(StrBuf *dest, const StrBuf *Source, int parmnum, char separator)
 214 {
 215         const char *s;                  //* source * /
 216         int len = 0;                    //* running total length of extracted string * /
 217         int current_token = 0;          //* token currently being processed * /
 218
 219         if ((Source == NULL) || (Source->BufUsed ==0)) {
 220                 return(-1);
 221         }
 222         s = Source->buf;
 223
 224         if (dest == NULL) {
 225                 return(-1);
 226         }
 227
 228         //cit_backtrace();
 229         //lprintf (CTDL_DEBUG, "test >: n: %d sep: %c source: %s \n willi \n", parmnum, separator, source);
 230         dest->buf[0] = '\0';
 231         dest->BufUsed = 0;
 232
 233         while (*s) {
 234                 if (*s == separator) {
 235                         ++current_token;
 236                 }
 237                 if (len >= dest->BufSize)
 238                         if (!IncreaseBuf(dest, 1, -1))
 239                                 break;
 240                 if ( (current_token == parmnum) &&
 241                      (*s != separator)) {
 242                         dest->buf[len] = *s;
 243                         ++len;
 244                 }
 245                 else if (current_token > parmnum) {
 246                         break;
 247                 }
 248                 ++s;
 249         }
 250
 251         dest->buf[len] = '\0';
 252         dest->BufUsed = len;
 253
 254         if (current_token < parmnum) {
 255                 //lprintf (CTDL_DEBUG,"test <!: %s\n", dest);
 256                 return(-1);
 257         }
 258         //lprintf (CTDL_DEBUG,"test <: %d; %s\n", len, dest);
 259         return(len);
 260 }
 261
 262
 263 /*
 264  * extract_int()  -  extract an int parm w/o supplying a buffer
 265  */
 266 int StrBufExtract_int(const StrBuf* Source, int parmnum, char separator)
 267 {
 268         StrBuf tmp;
 269         char buf[64];
 270
 271         tmp.buf = buf;
 272         buf[0] = '\0';
 273         tmp.BufSize = 64;
 274         tmp.BufUsed = 0;
 275         if (StrBufExtract_token(&tmp, Source, parmnum, separator) > 0)
 276                 return(atoi(buf));
 277         else
 278                 return 0;
 279 }
 280
 281 /*
 282  * extract_long()  -  extract an long parm w/o supplying a buffer
 283  */
 284 long StrBufExtract_long(const StrBuf* Source, int parmnum, char separator)
 285 {
 286         StrBuf tmp;
 287         char buf[64];
 288
 289         tmp.buf = buf;
 290         buf[0] = '\0';
 291         tmp.BufSize = 64;
 292         tmp.BufUsed = 0;
 293         if (StrBufExtract_token(&tmp, Source, parmnum, separator) > 0)
 294                 return(atoi(buf));
 295         else
 296                 return 0;
 297 }
 298
 299
 300 /*
 301  * extract_unsigned_long() - extract an unsigned long parm
 302  */
 303 unsigned long StrBufExtract_unsigned_long(const StrBuf* Source, int parmnum, char separator)
 304 {
 305         StrBuf tmp;
 306         char buf[64];
 307
 308         tmp.buf = buf;
 309         buf[0] = '\0';
 310         tmp.BufSize = 64;
 311         tmp.BufUsed = 0;
 312         if (StrBufExtract_token(&tmp, Source, parmnum, separator) > 0)
 313                 return(atoi(buf));
 314         else
 315                 return 0;
 316 }
 317
 318
 319
 320 /**
 321  * \brief Input binary data from socket
 322  * \param buf the buffer to get the input to
 323  * \param bytes the maximal number of bytes to read
 324  */
 325 int StrBufTCP_read_line(StrBuf *buf, int fd, int append, const char **Error)
 326 {
 327         int len, rlen, slen;
 328
 329         if (!append)
 330                 FlushStrBuf(buf);
 331
 332         slen = len = buf->BufUsed;
 333         while (buf->buf[len] != '\n') {
 334                 rlen = read(fd, &buf->buf[len], 1);
 335                 if (rlen < 1) {
 336                         *Error = strerror(errno);
 337
 338                         close(fd);
 339
 340                         return -1;
 341                 }
 342                 if (buf->buf[len] == '\n')
 343                         break;
 344                 if (buf->buf[len] != '\r')
 345                         len ++;
 346                 if (!(len < buf->BufSize)) {
 347                         buf->BufUsed = len;
 348                         buf->buf[len+1] = '\0';
 349                         IncreaseBuf(buf, 1, -1);
 350                 }
 351         }
 352         buf->BufUsed = len;
 353         buf->buf[len] = '\0';
 354         return len - slen;
 355 }
 356
 357 void StrBufCutLeft(StrBuf *Buf, int nChars)
 358 {
 359         if (nChars >= Buf->BufUsed) {
 360                 FlushStrBuf(Buf);
 361                 return;
 362         }
 363         memmove(Buf->buf, Buf->buf + nChars, Buf->BufUsed - nChars);
 364         Buf->BufUsed -= nChars;
 365 }
 366
 367 void StrBufCutRight(StrBuf *Buf, int nChars)
 368 {
 369         if (nChars >= Buf->BufUsed) {
 370                 FlushStrBuf(Buf);
 371                 return;
 372         }
 373         Buf->BufUsed -= nChars;
 374         Buf->buf[Buf->BufUsed] = '\0';
 375 }
 376
 377
 378 /*
 379  * string conversion function
 380  */
 381 void StrBufEUid_unescapize(StrBuf *target, StrBuf *source)
 382 {
 383         int a, b, len;
 384         char hex[3];
 385         int target_length = 0;
 386
 387         if (target != NULL)
 388                 FlushStrBuf(target);
 389
 390         if (source == NULL ||target == NULL)
 391         {
 392                 return;
 393         }
 394
 395         len = source->BufUsed;
 396         for (a = 0; a < len; ++a) {
 397                 if (target_length >= target->BufSize)
 398                         IncreaseBuf(target, 1, -1);
 399
 400                 if (source->buf[a] == '=') {
 401                         hex[0] = source->buf[a + 1];
 402                         hex[1] = source->buf[a + 2];
 403                         hex[2] = 0;
 404                         b = 0;
 405                         sscanf(hex, "%02x", &b);
 406                         target->buf[target_length] = b;
 407                         target->buf[++target_length] = 0;
 408                         a += 2;
 409                 }
 410                 else {
 411                         target->buf[target_length] = source->buf[a];
 412                         target->buf[++target_length] = 0;
 413                 }
 414         }
 415 }
 416