2 * Unix SMB/CIFS implementation.
3 * SMB parameters and setup
4 * Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995.
6 * Added afdgets() Jelmer Vernooij 2005
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)
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
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/>.
23 #include "system/shmem.h"
24 #include "system/filesys.h"
28 * @brief File-related utility functions
32 read a line from a file with possible \ continuation chars.
33 Blanks at the start or end of a line are stripped.
34 The string will be allocated if s2 is NULL
36 _PUBLIC_ char *fgets_slash(char *s2,int maxlen,XFILE *f)
41 bool start_of_line = true;
46 if (maxlen <2) return(NULL);
50 maxlen = MIN(maxlen,8);
51 s = (char *)malloc(maxlen);
58 while (len < maxlen-1)
66 while (len > 0 && s[len-1] == ' ')
70 if (len > 0 && s[len-1] == '\\')
86 start_of_line = false;
90 if (!s2 && len > maxlen-3)
95 t = realloc_p(s, char, maxlen);
97 DEBUG(0,("fgets_slash: failed to expand buffer!\n"));
107 * Read one line (data until next newline or eof) and allocate it
109 _PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint)
112 ssize_t alloc_size = 0, offset = 0, ret;
115 if (hint <= 0) hint = 0x100;
120 data = talloc_realloc(mem_ctx, data, char, alloc_size);
125 ret = read(fd, data + offset, hint);
137 for (p = 0; p < ret; p++) {
138 if (data[offset + p] == '\n')
143 data[offset + p] = '\0';
145 /* Go back to position of newline */
146 lseek(fd, p - ret + 1, SEEK_CUR);
152 } while (ret == hint);
161 load a file into memory from a fd.
163 _PUBLIC_ char *fd_load(int fd, size_t *size, TALLOC_CTX *mem_ctx)
168 if (fstat(fd, &sbuf) != 0) return NULL;
170 p = (char *)talloc_size(mem_ctx, sbuf.st_size+1);
173 if (read(fd, p, sbuf.st_size) != sbuf.st_size) {
179 if (size) *size = sbuf.st_size;
185 load a file into memory
187 _PUBLIC_ char *file_load(const char *fname, size_t *size, TALLOC_CTX *mem_ctx)
192 if (!fname || !*fname) return NULL;
194 fd = open(fname,O_RDONLY);
195 if (fd == -1) return NULL;
197 p = fd_load(fd, size, mem_ctx);
206 mmap (if possible) or read a file
208 _PUBLIC_ void *map_file(const char *fname, size_t size)
214 fd = open(fname, O_RDONLY, 0);
216 DEBUG(2,("Failed to load %s - %s\n", fname, strerror(errno)));
219 p = mmap(NULL, size, PROT_READ, MAP_SHARED|MAP_FILE, fd, 0);
221 if (p == MAP_FAILED) {
222 DEBUG(1,("Failed to mmap %s - %s\n", fname, strerror(errno)));
227 p = file_load(fname, &s2, talloc_autofree_context());
230 DEBUG(1,("incorrect size for %s - got %d expected %d\n",
231 fname, (int)s2, (int)size));
242 parse a buffer into lines
243 'p' will be freed on error, and otherwise will be made a child of the returned array
245 static char **file_lines_parse(char *p, size_t size, int *numlines, TALLOC_CTX *mem_ctx)
252 for (s = p, i=0; s < p+size; s++) {
253 if (s[0] == '\n') i++;
256 ret = talloc_array(mem_ctx, char *, i+2);
262 talloc_steal(ret, p);
264 memset(ret, 0, sizeof(ret[0])*(i+2));
267 for (s = p, i=0; s < p+size; s++) {
273 if (s[0] == '\r') s[0] = 0;
276 /* remove any blank lines at the end */
277 while (i > 0 && ret[i-1][0] == 0) {
281 if (numlines) *numlines = i;
288 load a file into memory and return an array of pointers to lines in the file
289 must be freed with talloc_free().
291 _PUBLIC_ char **file_lines_load(const char *fname, int *numlines, TALLOC_CTX *mem_ctx)
296 p = file_load(fname, &size, mem_ctx);
299 return file_lines_parse(p, size, numlines, mem_ctx);
303 load a fd into memory and return an array of pointers to lines in the file
304 must be freed with talloc_free(). If convert is true calls unix_to_dos on
307 _PUBLIC_ char **fd_lines_load(int fd, int *numlines, TALLOC_CTX *mem_ctx)
312 p = fd_load(fd, &size, mem_ctx);
315 return file_lines_parse(p, size, numlines, mem_ctx);
320 take a list of lines and modify them to produce a list where \ continues
323 _PUBLIC_ void file_lines_slashcont(char **lines)
327 for (i=0; lines[i];) {
328 int len = strlen(lines[i]);
329 if (lines[i][len-1] == '\\') {
330 lines[i][len-1] = ' ';
332 char *p = &lines[i][len];
333 while (p < lines[i+1]) *p++ = ' ';
334 for (j = i+1; lines[j]; j++) lines[j] = lines[j+1];
343 save a lump of data into a file. Mostly used for debugging
345 _PUBLIC_ bool file_save(const char *fname, const void *packet, size_t length)
348 fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
352 if (write(fd, packet, length) != (size_t)length) {
359 _PUBLIC_ int vfdprintf(int fd, const char *format, va_list ap)
366 len = vasprintf(&p, format, ap2);
368 if (len <= 0) return len;
369 ret = write(fd, p, len);
374 _PUBLIC_ int fdprintf(int fd, const char *format, ...)
379 va_start(ap, format);
380 ret = vfdprintf(fd, format, ap);
387 try to determine if the filesystem supports large files
389 _PUBLIC_ bool large_file_support(const char *path)
395 fd = open(path, O_RDWR|O_CREAT, 0600);
398 /* have to assume large files are OK */
401 ret = pread(fd, &c, 1, ((uint64_t)1)<<32);