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/debug.h"
  28
  29 /**
  30  * Read one line (data until next newline or eof) and allocate it
  31  */
  32 _PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint)
  33 {
  34         char *data = NULL;
  35         ssize_t alloc_size = 0, offset = 0, ret;
  36         int p;
  37
  38         if (hint <= 0) hint = 0x100;
  39
  40         do {
  41                 alloc_size += hint;
  42
  43                 data = talloc_realloc(mem_ctx, data, char, alloc_size);
  44
  45                 if (!data)
  46                         return NULL;
  47
  48                 ret = read(fd, data + offset, hint);
  49
  50                 if (ret == 0) {
  51                         return NULL;
  52                 }
  53
  54                 if (ret == -1) {
  55                         talloc_free(data);
  56                         return NULL;
  57                 }
  58
  59                 /* Find newline */
  60                 for (p = 0; p < ret; p++) {
  61                         if (data[offset + p] == '\n')
  62                                 break;
  63                 }
  64
  65                 if (p < ret) {
  66                         data[offset + p] = '\0';
  67
  68                         /* Go back to position of newline */
  69                         lseek(fd, p - ret + 1, SEEK_CUR);
  70                         return data;
  71                 }
  72
  73                 offset += ret;
  74
  75         } while (ret == hint);
  76
  77         data[offset] = '\0';
  78
  79         return data;
  80 }
  81
  82 char *fgets_slash(TALLOC_CTX *mem_ctx, char *s2, int maxlen, FILE *f)
  83 {
  84         char *s = s2;
  85         int len = 0;
  86         int c;
  87         bool start_of_line = true;
  88
  89         if (feof(f)) {
  90                 return NULL;
  91         }
  92
  93         if (maxlen < 2) {
  94                 return NULL;
  95         }
  96
  97         if (s2 == NULL) {
  98                 maxlen = MIN(maxlen,8);
  99                 s = talloc_array(mem_ctx, char, maxlen);
 100         }
 101
 102         if (s == NULL) {
 103                 return NULL;
 104         }
 105
 106         *s = 0;
 107
 108         while (len < maxlen-1) {
 109                 c = getc(f);
 110                 switch (c)
 111                 {
 112                     case '\r':
 113                             break;
 114                     case '\n':
 115                             while (len > 0 && s[len-1] == ' ') {
 116                                     s[--len] = 0;
 117                             }
 118                             if (len > 0 && s[len-1] == '\\') {
 119                                     s[--len] = 0;
 120                                     start_of_line = true;
 121                                     break;
 122                             }
 123                             return s;
 124                     case EOF:
 125                             if (len <= 0 && (s2 == NULL)) {
 126                                     TALLOC_FREE(s);
 127                             }
 128                             return (len>0) ? s : NULL;
 129                     case ' ':
 130                             if (start_of_line) {
 131                                     break;
 132                             }
 133                             /* fall through */
 134                     default:
 135                             start_of_line = false;
 136                             s[len++] = c;
 137                             s[len] = 0;
 138                 }
 139                 if ((s2 == NULL) && (len > maxlen-3)) {
 140                         int m;
 141                         char *t;
 142
 143                         m = maxlen * 2;
 144                         if (m < maxlen) {
 145                                 DBG_ERR("length overflow");
 146                                 TALLOC_FREE(s);
 147                                 return NULL;
 148                         }
 149                         maxlen = m;
 150
 151                         t = talloc_realloc(mem_ctx, s, char, maxlen);
 152                         if (t == NULL) {
 153                                 DBG_ERR("failed to expand buffer!\n");
 154                                 TALLOC_FREE(s);
 155                                 return NULL;
 156                         }
 157
 158                         s = t;
 159                 }
 160         }
 161
 162         return s;
 163 }
 164
 165 /**
 166 load a file into memory from a fd.
 167 **/
 168 _PUBLIC_ char *fd_load(int fd, size_t *psize, size_t maxsize, TALLOC_CTX *mem_ctx)
 169 {
 170         struct stat sbuf;
 171         char *p;
 172         size_t size;
 173
 174         if (fstat(fd, &sbuf) != 0) return NULL;
 175
 176         size = sbuf.st_size;
 177
 178         if (maxsize) {
 179                 size = MIN(size, maxsize);
 180         }
 181
 182         p = (char *)talloc_size(mem_ctx, size+1);
 183         if (!p) return NULL;
 184
 185         if (read(fd, p, size) != size) {
 186                 talloc_free(p);
 187                 return NULL;
 188         }
 189         p[size] = 0;
 190
 191         if (psize) *psize = size;
 192
 193         return p;
 194 }
 195
 196 /**
 197 load a file into memory
 198 **/
 199 _PUBLIC_ char *file_load(const char *fname, size_t *size, size_t maxsize, TALLOC_CTX *mem_ctx)
 200 {
 201         int fd;
 202         char *p;
 203
 204         if (!fname || !*fname) return NULL;
 205
 206         fd = open(fname,O_RDONLY);
 207         if (fd == -1) return NULL;
 208
 209         p = fd_load(fd, size, maxsize, mem_ctx);
 210
 211         close(fd);
 212
 213         return p;
 214 }
 215
 216 /**
 217 parse a buffer into lines
 218 'p' will be freed on error, and otherwise will be made a child of the returned array
 219 **/
 220 char **file_lines_parse(char *p, size_t size, int *numlines, TALLOC_CTX *mem_ctx)
 221 {
 222         int i;
 223         char *s, **ret;
 224
 225         if (!p) return NULL;
 226
 227         for (s = p, i=0; s < p+size; s++) {
 228                 if (s[0] == '\n') i++;
 229         }
 230
 231         ret = talloc_zero_array(mem_ctx, char *, i+2);
 232         if (!ret) {
 233                 talloc_free(p);
 234                 return NULL;
 235         }
 236
 237         talloc_steal(ret, p);
 238
 239         ret[0] = p;
 240         for (s = p, i=0; s < p+size; s++) {
 241                 if (s[0] == '\n') {
 242                         s[0] = 0;
 243                         i++;
 244                         ret[i] = s+1;
 245                 }
 246                 if (s[0] == '\r') s[0] = 0;
 247         }
 248
 249         /* remove any blank lines at the end */
 250         while (i > 0 && ret[i-1][0] == 0) {
 251                 i--;
 252         }
 253
 254         if (numlines) *numlines = i;
 255
 256         return ret;
 257 }
 258
 259
 260 /**
 261 load a file into memory and return an array of pointers to lines in the file
 262 must be freed with talloc_free().
 263 **/
 264 _PUBLIC_ char **file_lines_load(const char *fname, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx)
 265 {
 266         char *p;
 267         size_t size;
 268
 269         p = file_load(fname, &size, maxsize, mem_ctx);
 270         if (!p) return NULL;
 271
 272         return file_lines_parse(p, size, numlines, mem_ctx);
 273 }
 274
 275 /**
 276 load a fd into memory and return an array of pointers to lines in the file
 277 must be freed with talloc_free(). If convert is true calls unix_to_dos on
 278 the list.
 279 **/
 280 _PUBLIC_ char **fd_lines_load(int fd, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx)
 281 {
 282         char *p;
 283         size_t size;
 284
 285         p = fd_load(fd, &size, maxsize, mem_ctx);
 286         if (!p) return NULL;
 287
 288         return file_lines_parse(p, size, numlines, mem_ctx);
 289 }
 290
 291 _PUBLIC_ bool file_save_mode(const char *fname, const void *packet,
 292                              size_t length, mode_t mode)
 293 {
 294         int fd;
 295         fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, mode);
 296         if (fd == -1) {
 297                 return false;
 298         }
 299         if (write(fd, packet, length) != (size_t)length) {
 300                 close(fd);
 301                 return false;
 302         }
 303         close(fd);
 304         return true;
 305 }
 306
 307 /**
 308   save a lump of data into a file. Mostly used for debugging
 309 */
 310 _PUBLIC_ bool file_save(const char *fname, const void *packet, size_t length)
 311 {
 312         return file_save_mode(fname, packet, length, 0644);
 313 }
 314
 315 _PUBLIC_ int vfdprintf(int fd, const char *format, va_list ap)
 316 {
 317         char *p;
 318         int len, ret;
 319         va_list ap2;
 320
 321         va_copy(ap2, ap);
 322         len = vasprintf(&p, format, ap2);
 323         va_end(ap2);
 324         if (len <= 0) return len;
 325         ret = write(fd, p, len);
 326         SAFE_FREE(p);
 327         return ret;
 328 }
 329
 330 _PUBLIC_ int fdprintf(int fd, const char *format, ...)
 331 {
 332         va_list ap;
 333         int ret;
 334
 335         va_start(ap, format);
 336         ret = vfdprintf(fd, format, ap);
 337         va_end(ap);
 338         return ret;
 339 }
 340
 341
 342 /*
 343   compare two files, return true if the two files have the same content
 344  */
 345 bool file_compare(const char *path1, const char *path2)
 346 {
 347         size_t size1, size2;
 348         char *p1, *p2;
 349         TALLOC_CTX *mem_ctx = talloc_new(NULL);
 350
 351         p1 = file_load(path1, &size1, 0, mem_ctx);
 352         p2 = file_load(path2, &size2, 0, mem_ctx);
 353         if (!p1 || !p2 || size1 != size2) {
 354                 talloc_free(mem_ctx);
 355                 return false;
 356         }
 357         if (memcmp(p1, p2, size1) != 0) {
 358                 talloc_free(mem_ctx);
 359                 return false;
 360         }
 361         talloc_free(mem_ctx);
 362         return true;
 363 }