source/lib/util_file.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * SMB parameters and setup
   4  * Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it under
   7  * the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc., 675
  18  * Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "includes.h"
  22
  23 #ifndef MAP_FAILED
  24 #define MAP_FAILED ((void *)-1)
  25 #endif
  26
  27 /****************************************************************************
  28  Read a line from a file with possible \ continuation chars.
  29  Blanks at the start or end of a line are stripped.
  30  The string will be allocated if s2 is NULL.
  31 ****************************************************************************/
  32
  33 char *fgets_slash(char *s2,int maxlen,XFILE *f)
  34 {
  35         char *s=s2;
  36         int len = 0;
  37         int c;
  38         BOOL start_of_line = True;
  39
  40         if (x_feof(f)) {
  41                 return(NULL);
  42         }
  43
  44         if (maxlen <2) {
  45                 return(NULL);
  46         }
  47
  48         if (!s2) {
  49                 maxlen = MIN(maxlen,8);
  50                 s = (char *)SMB_MALLOC(maxlen);
  51         }
  52
  53         if (!s) {
  54                 return(NULL);
  55         }
  56
  57         *s = 0;
  58
  59         while (len < maxlen-1) {
  60                 c = x_getc(f);
  61                 switch (c) {
  62                         case '\r':
  63                                 break;
  64                         case '\n':
  65                                 while (len > 0 && s[len-1] == ' ') {
  66                                         s[--len] = 0;
  67                                 }
  68                                 if (len > 0 && s[len-1] == '\\') {
  69                                         s[--len] = 0;
  70                                         start_of_line = True;
  71                                         break;
  72                                 }
  73                                 return(s);
  74                         case EOF:
  75                                 if (len <= 0 && !s2)  {
  76                                         SAFE_FREE(s);
  77                                 }
  78                                 return(len>0?s:NULL);
  79                         case ' ':
  80                                 if (start_of_line) {
  81                                         break;
  82                                 }
  83                         default:
  84                                 start_of_line = False;
  85                                 s[len++] = c;
  86                                 s[len] = 0;
  87                 }
  88
  89                 if (!s2 && len > maxlen-3) {
  90                         maxlen *= 2;
  91                         s = (char *)SMB_REALLOC(s,maxlen);
  92                         if (!s) {
  93                                 DEBUG(0,("fgets_slash: failed to expand buffer!\n"));
  94                                 return(NULL);
  95                         }
  96                 }
  97         }
  98         return(s);
  99 }
 100
 101 /****************************************************************************
 102  Load from a pipe into memory.
 103 ****************************************************************************/
 104
 105 char *file_pload(char *syscmd, size_t *size)
 106 {
 107         int fd, n;
 108         char *p;
 109         pstring buf;
 110         size_t total;
 111
 112         fd = sys_popen(syscmd);
 113         if (fd == -1) {
 114                 return NULL;
 115         }
 116
 117         p = NULL;
 118         total = 0;
 119
 120         while ((n = read(fd, buf, sizeof(buf))) > 0) {
 121                 p = (char *)SMB_REALLOC(p, total + n + 1);
 122                 if (!p) {
 123                         DEBUG(0,("file_pload: failed to expand buffer!\n"));
 124                         close(fd);
 125                         return NULL;
 126                 }
 127                 memcpy(p+total, buf, n);
 128                 total += n;
 129         }
 130
 131         if (p) {
 132                 p[total] = 0;
 133         }
 134
 135         /* FIXME: Perhaps ought to check that the command completed
 136          * successfully (returned 0); if not the data may be
 137          * truncated. */
 138         sys_pclose(fd);
 139
 140         if (size) {
 141                 *size = total;
 142         }
 143
 144         return p;
 145 }
 146
 147 /****************************************************************************
 148  Load a file into memory from a fd.
 149  Truncate at maxsize. If maxsize == 0 - no limit.
 150 ****************************************************************************/
 151
 152 char *fd_load(int fd, size_t *psize, size_t maxsize)
 153 {
 154         SMB_STRUCT_STAT sbuf;
 155         size_t size;
 156         char *p;
 157
 158         if (sys_fstat(fd, &sbuf) != 0) {
 159                 return NULL;
 160         }
 161
 162         size = sbuf.st_size;
 163         if (maxsize) {
 164                 size = MIN(size, maxsize);
 165         }
 166
 167         p = (char *)SMB_MALLOC(size+1);
 168         if (!p) {
 169                 return NULL;
 170         }
 171
 172         if (read(fd, p, size) != size) {
 173                 SAFE_FREE(p);
 174                 return NULL;
 175         }
 176         p[size] = 0;
 177
 178         if (psize) {
 179                 *psize = size;
 180         }
 181
 182         return p;
 183 }
 184
 185 /****************************************************************************
 186  Load a file into memory.
 187 ****************************************************************************/
 188
 189 char *file_load(const char *fname, size_t *size, size_t maxsize)
 190 {
 191         int fd;
 192         char *p;
 193
 194         if (!fname || !*fname) {
 195                 return NULL;
 196         }
 197
 198         fd = open(fname,O_RDONLY);
 199         if (fd == -1) {
 200                 return NULL;
 201         }
 202
 203         p = fd_load(fd, size, maxsize);
 204         close(fd);
 205         return p;
 206 }
 207
 208 /*******************************************************************
 209  unmap or free memory
 210 *******************************************************************/
 211
 212 BOOL unmap_file(void* start, size_t size)
 213 {
 214 #ifdef HAVE_MMAP
 215         if ( munmap( start, size ) != 0 ) {
 216                 DEBUG( 1, ("map_file: Failed to unmap address %p "
 217                         "of size %u - %s\n",
 218                         start, (unsigned int)size, strerror(errno) ));
 219                 return False;
 220         }
 221         return True;
 222 #else
 223         SAFE_FREE( start );
 224         return True;
 225 #endif
 226 }
 227
 228 /*******************************************************************
 229  mmap (if possible) or read a file.
 230 ********************************************************************/
 231
 232 void *map_file(char *fname, size_t size)
 233 {
 234         size_t s2 = 0;
 235         void *p = NULL;
 236 #ifdef HAVE_MMAP
 237         int fd;
 238         fd = open(fname, O_RDONLY, 0);
 239         if (fd == -1) {
 240                 DEBUG(2,("map_file: Failed to load %s - %s\n", fname, strerror(errno)));
 241                 return NULL;
 242         }
 243         p = mmap(NULL, size, PROT_READ, MAP_SHARED|MAP_FILE, fd, 0);
 244         close(fd);
 245         if (p == MAP_FAILED) {
 246                 DEBUG(1,("map_file: Failed to mmap %s - %s\n", fname, strerror(errno)));
 247                 return NULL;
 248         }
 249 #endif
 250         if (!p) {
 251                 p = file_load(fname, &s2, 0);
 252                 if (!p) {
 253                         return NULL;
 254                 }
 255                 if (s2 != size) {
 256                         DEBUG(1,("map_file: incorrect size for %s - got %lu expected %lu\n",
 257                                  fname, (unsigned long)s2, (unsigned long)size));
 258                         SAFE_FREE(p);
 259                         return NULL;
 260                 }
 261         }
 262         return p;
 263 }
 264
 265 /****************************************************************************
 266  Parse a buffer into lines.
 267 ****************************************************************************/
 268
 269 static char **file_lines_parse(char *p, size_t size, int *numlines)
 270 {
 271         int i;
 272         char *s, **ret;
 273
 274         if (!p) {
 275                 return NULL;
 276         }
 277
 278         for (s = p, i=0; s < p+size; s++) {
 279                 if (s[0] == '\n') i++;
 280         }
 281
 282         ret = SMB_MALLOC_ARRAY(char *, i+2);
 283         if (!ret) {
 284                 SAFE_FREE(p);
 285                 return NULL;
 286         }
 287         memset(ret, 0, sizeof(ret[0])*(i+2));
 288
 289         ret[0] = p;
 290         for (s = p, i=0; s < p+size; s++) {
 291                 if (s[0] == '\n') {
 292                         s[0] = 0;
 293                         i++;
 294                         ret[i] = s+1;
 295                 }
 296                 if (s[0] == '\r') {
 297                         s[0] = 0;
 298                 }
 299         }
 300
 301         /* remove any blank lines at the end */
 302         while (i > 0 && ret[i-1][0] == 0) {
 303                 i--;
 304         }
 305
 306         if (numlines) {
 307                 *numlines = i;
 308         }
 309
 310         return ret;
 311 }
 312
 313 /****************************************************************************
 314  Load a file into memory and return an array of pointers to lines in the file
 315  must be freed with file_lines_free().
 316 ****************************************************************************/
 317
 318 char **file_lines_load(const char *fname, int *numlines, size_t maxsize)
 319 {
 320         char *p;
 321         size_t size = 0;
 322
 323         p = file_load(fname, &size, maxsize);
 324         if (!p) {
 325                 return NULL;
 326         }
 327
 328         return file_lines_parse(p, size, numlines);
 329 }
 330
 331 /****************************************************************************
 332  Load a fd into memory and return an array of pointers to lines in the file
 333  must be freed with file_lines_free(). If convert is true calls unix_to_dos on
 334  the list.
 335 ****************************************************************************/
 336
 337 char **fd_lines_load(int fd, int *numlines, size_t maxsize)
 338 {
 339         char *p;
 340         size_t size;
 341
 342         p = fd_load(fd, &size, maxsize);
 343         if (!p) {
 344                 return NULL;
 345         }
 346
 347         return file_lines_parse(p, size, numlines);
 348 }
 349
 350 /****************************************************************************
 351  Load a pipe into memory and return an array of pointers to lines in the data
 352  must be freed with file_lines_free().
 353 ****************************************************************************/
 354
 355 char **file_lines_pload(char *syscmd, int *numlines)
 356 {
 357         char *p;
 358         size_t size;
 359
 360         p = file_pload(syscmd, &size);
 361         if (!p) {
 362                 return NULL;
 363         }
 364
 365         return file_lines_parse(p, size, numlines);
 366 }
 367
 368 /****************************************************************************
 369  Free lines loaded with file_lines_load.
 370 ****************************************************************************/
 371
 372 void file_lines_free(char **lines)
 373 {
 374         if (!lines) {
 375                 return;
 376         }
 377         SAFE_FREE(lines[0]);
 378         SAFE_FREE(lines);
 379 }
 380
 381 /****************************************************************************
 382  Take a list of lines and modify them to produce a list where \ continues
 383  a line.
 384 ****************************************************************************/
 385
 386 void file_lines_slashcont(char **lines)
 387 {
 388         int i, j;
 389
 390         for (i=0; lines[i];) {
 391                 int len = strlen(lines[i]);
 392                 if (lines[i][len-1] == '\\') {
 393                         lines[i][len-1] = ' ';
 394                         if (lines[i+1]) {
 395                                 char *p = &lines[i][len];
 396                                 while (p < lines[i+1]) {
 397                                         *p++ = ' ';
 398                                 }
 399                                 for (j = i+1; lines[j]; j++) {
 400                                         lines[j] = lines[j+1];
 401                                 }
 402                         }
 403                 } else {
 404                         i++;
 405                 }
 406         }
 407 }
 408
 409 /****************************************************************************
 410  Save a lump of data into a file. Mostly used for debugging.
 411 ****************************************************************************/
 412
 413 BOOL file_save(const char *fname, void *packet, size_t length)
 414 {
 415         int fd;
 416         fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
 417         if (fd == -1) {
 418                 return False;
 419         }
 420         if (write(fd, packet, length) != (size_t)length) {
 421                 return False;
 422         }
 423         close(fd);
 424         return True;
 425 }