lib/util/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  * Added afdgets() Jelmer Vernooij 2005
   7  *
   8  * This program is free software; you can redistribute it and/or modify it under
   9  * the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 3 of the License, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along with
  19  * this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "replace.h"
  23 #include "system/shmem.h"
  24 #include "system/filesys.h"
  25 #include <talloc.h>
  26 #include "lib/util/samba_util.h"
  27 #include "lib/util/sys_popen.h"
  28 #include "lib/util/sys_rw.h"
  29 #include "lib/util/debug.h"
  30
  31 /**
  32  * Read one line (data until next newline or eof) and allocate it
  33  */
  34 _PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint)
  35 {
  36         char *data = NULL;
  37         ssize_t alloc_size = 0, offset = 0, ret;
  38         int p;
  39
  40         if (hint <= 0) hint = 0x100;
  41
  42         do {
  43                 alloc_size += hint;
  44
  45                 data = talloc_realloc(mem_ctx, data, char, alloc_size);
  46
  47                 if (!data)
  48                         return NULL;
  49
  50                 ret = read(fd, data + offset, hint);
  51
  52                 if (ret == 0) {
  53                         return NULL;
  54                 }
  55
  56                 if (ret == -1) {
  57                         talloc_free(data);
  58                         return NULL;
  59                 }
  60
  61                 /* Find newline */
  62                 for (p = 0; p < ret; p++) {
  63                         if (data[offset + p] == '\n')
  64                                 break;
  65                 }
  66
  67                 if (p < ret) {
  68                         data[offset + p] = '\0';
  69
  70                         /* Go back to position of newline */
  71                         lseek(fd, p - ret + 1, SEEK_CUR);
  72                         return data;
  73                 }
  74
  75                 offset += ret;
  76
  77         } while (ret == hint);
  78
  79         data[offset] = '\0';
  80
  81         return data;
  82 }
  83
  84 char *fgets_slash(TALLOC_CTX *mem_ctx, char *s2, size_t maxlen, FILE *f)
  85 {
  86         char *s = s2;
  87         size_t len = 0;
  88         int c;
  89         bool start_of_line = true;
  90
  91         if (feof(f)) {
  92                 return NULL;
  93         }
  94
  95         if (maxlen < 2) {
  96                 return NULL;
  97         }
  98
  99         if (s2 == NULL) {
 100                 maxlen = MIN(maxlen,8);
 101                 s = talloc_array(mem_ctx, char, maxlen);
 102         }
 103
 104         if (s == NULL) {
 105                 return NULL;
 106         }
 107
 108         *s = 0;
 109
 110         while (len < maxlen-1) {
 111                 c = getc(f);
 112                 switch (c)
 113                 {
 114                     case '\r':
 115                             break;
 116                     case '\n':
 117                             while (len > 0 && s[len-1] == ' ') {
 118                                     s[--len] = 0;
 119                             }
 120                             if (len > 0 && s[len-1] == '\\') {
 121                                     s[--len] = 0;
 122                                     start_of_line = true;
 123                                     break;
 124                             }
 125                             return s;
 126                     case EOF:
 127                             if (len <= 0 && (s2 == NULL)) {
 128                                     TALLOC_FREE(s);
 129                             }
 130                             return (len>0) ? s : NULL;
 131                     case ' ':
 132                             if (start_of_line) {
 133                                     break;
 134                             }
 135
 136                             FALL_THROUGH;
 137                     default:
 138                             start_of_line = false;
 139                             s[len++] = c;
 140                             s[len] = 0;
 141                 }
 142                 if ((s2 == NULL) && (len > maxlen-3)) {
 143                         int m;
 144                         char *t;
 145
 146                         m = maxlen * 2;
 147                         if (m < maxlen) {
 148                                 DBG_ERR("length overflow");
 149                                 TALLOC_FREE(s);
 150                                 return NULL;
 151                         }
 152                         maxlen = m;
 153
 154                         t = talloc_realloc(mem_ctx, s, char, maxlen);
 155                         if (t == NULL) {
 156                                 DBG_ERR("failed to expand buffer!\n");
 157                                 TALLOC_FREE(s);
 158                                 return NULL;
 159                         }
 160
 161                         s = t;
 162                 }
 163         }
 164
 165         return s;
 166 }
 167
 168 /**
 169 load a file into memory from a fd.
 170 **/
 171 _PUBLIC_ char *fd_load(int fd, size_t *psize, size_t maxsize, TALLOC_CTX *mem_ctx)
 172 {
 173         struct stat sbuf;
 174         char *p;
 175         size_t size;
 176
 177         if (fstat(fd, &sbuf) != 0) return NULL;
 178
 179         size = sbuf.st_size;
 180
 181         if (maxsize) {
 182                 size = MIN(size, maxsize);
 183         }
 184
 185         p = (char *)talloc_size(mem_ctx, size+1);
 186         if (!p) return NULL;
 187
 188         if (read(fd, p, size) != size) {
 189                 talloc_free(p);
 190                 return NULL;
 191         }
 192         p[size] = 0;
 193
 194         if (psize) *psize = size;
 195
 196         return p;
 197 }
 198
 199 /**
 200 load a file into memory
 201 **/
 202 _PUBLIC_ char *file_load(const char *fname, size_t *size, size_t maxsize, TALLOC_CTX *mem_ctx)
 203 {
 204         int fd;
 205         char *p;
 206
 207         if (!fname || !*fname) return NULL;
 208
 209         fd = open(fname,O_RDONLY);
 210         if (fd == -1) return NULL;
 211
 212         p = fd_load(fd, size, maxsize, mem_ctx);
 213
 214         close(fd);
 215
 216         return p;
 217 }
 218
 219 /**
 220 parse a buffer into lines
 221 'p' will be freed on error, and otherwise will be made a child of the returned array
 222 **/
 223 char **file_lines_parse(char *p, size_t size, int *numlines, TALLOC_CTX *mem_ctx)
 224 {
 225         unsigned int i;
 226         char *s, **ret;
 227
 228         if (!p) return NULL;
 229
 230         for (s = p, i=0; s < p+size; s++) {
 231                 if (s[0] == '\n') i++;
 232         }
 233
 234         ret = talloc_zero_array(mem_ctx, char *, i+2);
 235         if (!ret) {
 236                 talloc_free(p);
 237                 return NULL;
 238         }
 239
 240         talloc_steal(ret, p);
 241
 242         ret[0] = p;
 243         for (s = p, i=1; s < p+size; s++) {
 244                 if (s[0] == '\n') {
 245                         s[0] = 0;
 246                         ret[i] = s+1;
 247                         i++;
 248                 }
 249                 if (s[0] == '\r') s[0] = 0;
 250         }
 251
 252         /* remove any blank lines at the end */
 253         while (i > 0 && ret[i-1][0] == 0) {
 254                 i--;
 255         }
 256
 257         if (numlines) *numlines = i;
 258
 259         return ret;
 260 }
 261
 262
 263 /**
 264 load a file into memory and return an array of pointers to lines in the file
 265 must be freed with talloc_free().
 266 **/
 267 _PUBLIC_ char **file_lines_load(const char *fname, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx)
 268 {
 269         char *p;
 270         size_t size;
 271
 272         p = file_load(fname, &size, maxsize, mem_ctx);
 273         if (!p) return NULL;
 274
 275         return file_lines_parse(p, size, numlines, mem_ctx);
 276 }
 277
 278 /**
 279 load a fd into memory and return an array of pointers to lines in the file
 280 must be freed with talloc_free(). If convert is true calls unix_to_dos on
 281 the list.
 282 **/
 283 _PUBLIC_ char **fd_lines_load(int fd, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx)
 284 {
 285         char *p;
 286         size_t size;
 287
 288         p = fd_load(fd, &size, maxsize, mem_ctx);
 289         if (!p) return NULL;
 290
 291         return file_lines_parse(p, size, numlines, mem_ctx);
 292 }
 293
 294 _PUBLIC_ bool file_save_mode(const char *fname, const void *packet,
 295                              size_t length, mode_t mode)
 296 {
 297         int fd;
 298         fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, mode);
 299         if (fd == -1) {
 300                 return false;
 301         }
 302         if (write(fd, packet, length) != (size_t)length) {
 303                 close(fd);
 304                 return false;
 305         }
 306         close(fd);
 307         return true;
 308 }
 309
 310 /**
 311   save a lump of data into a file. Mostly used for debugging
 312 */
 313 _PUBLIC_ bool file_save(const char *fname, const void *packet, size_t length)
 314 {
 315         return file_save_mode(fname, packet, length, 0644);
 316 }
 317
 318 _PUBLIC_ int vfdprintf(int fd, const char *format, va_list ap)
 319 {
 320         char *p;
 321         int len, ret;
 322         va_list ap2;
 323
 324         va_copy(ap2, ap);
 325         len = vasprintf(&p, format, ap2);
 326         va_end(ap2);
 327         if (len <= 0) return len;
 328         ret = write(fd, p, len);
 329         SAFE_FREE(p);
 330         return ret;
 331 }
 332
 333 _PUBLIC_ int fdprintf(int fd, const char *format, ...)
 334 {
 335         va_list ap;
 336         int ret;
 337
 338         va_start(ap, format);
 339         ret = vfdprintf(fd, format, ap);
 340         va_end(ap);
 341         return ret;
 342 }
 343
 344
 345 /*
 346   compare two files, return true if the two files have the same content
 347  */
 348 bool file_compare(const char *path1, const char *path2)
 349 {
 350         size_t size1, size2;
 351         char *p1, *p2;
 352         TALLOC_CTX *mem_ctx = talloc_new(NULL);
 353
 354         p1 = file_load(path1, &size1, 0, mem_ctx);
 355         p2 = file_load(path2, &size2, 0, mem_ctx);
 356         if (!p1 || !p2 || size1 != size2) {
 357                 talloc_free(mem_ctx);
 358                 return false;
 359         }
 360         if (memcmp(p1, p2, size1) != 0) {
 361                 talloc_free(mem_ctx);
 362                 return false;
 363         }
 364         talloc_free(mem_ctx);
 365         return true;
 366 }
 367
 368
 369 /**
 370  Load from a pipe into memory.
 371 **/
 372 char *file_pload(const char *syscmd, size_t *size)
 373 {
 374         int fd, n;
 375         char *p;
 376         char buf[1024];
 377         size_t total;
 378
 379         fd = sys_popen(syscmd);
 380         if (fd == -1) {
 381                 return NULL;
 382         }
 383
 384         p = NULL;
 385         total = 0;
 386
 387         while ((n = sys_read(fd, buf, sizeof(buf))) > 0) {
 388                 p = talloc_realloc(NULL, p, char, total + n + 1);
 389                 if (!p) {
 390                         DEBUG(0,("file_pload: failed to expand buffer!\n"));
 391                         close(fd);
 392                         return NULL;
 393                 }
 394                 memcpy(p+total, buf, n);
 395                 total += n;
 396         }
 397
 398         if (p) {
 399                 p[total] = 0;
 400         }
 401
 402         /* FIXME: Perhaps ought to check that the command completed
 403          * successfully (returned 0); if not the data may be
 404          * truncated. */
 405         sys_pclose(fd);
 406
 407         if (size) {
 408                 *size = total;
 409         }
 410
 411         return p;
 412 }