source: trunk-3.0/source/lib/util_file.c@ 103

Last change on this file since 103 was 1, checked in by Paul Smedley, 19 years ago

Initial code import
File size: 9.0 KB
Line 
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
33char *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
105char *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
152char *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
189char *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
212BOOL 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
232void *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
269static 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
318char **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
337char **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
355char **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
372void 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
386void 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
413BOOL 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}
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