librsync  2.3.2
fileutil.c
1/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
2 *
3 * librsync -- library for network deltas
4 *
5 * Copyright (C) 1999, 2000, 2001 by Martin Pool <mbp@sourcefrog.net>
6 * Copyright (C) 1999 by Andrew Tridgell <tridge@samba.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include "config.h"
24#include <assert.h>
25#include <stdlib.h>
26#include <stdio.h>
27#include <string.h>
28#include <errno.h>
29#ifdef HAVE_UNISTD_H
30# include <unistd.h>
31#endif
32#ifdef HAVE_FCNTL_H
33# include <fcntl.h>
34#endif
35#ifdef HAVE_SYS_TYPES_H
36# include <sys/types.h>
37#endif
38#ifdef HAVE_SYS_FILE_H
39# include <sys/file.h>
40#endif
41#ifdef HAVE_SYS_STAT_H
42# include <sys/stat.h>
43#endif
44#ifdef HAVE_IO_H
45# include <io.h>
46#endif
47#include "librsync.h"
48#include "trace.h"
49
50/* Use fseeko64, _fseeki64, or fseeko for long files if they exist. */
51#if defined(HAVE_FSEEKO64) && (SIZEOF_OFF_T < 8)
52# define fopen(f, m) fopen64((f), (m))
53# define fseek(f, o, w) fseeko64((f), (o), (w))
54#elif defined(HAVE__FSEEKI64)
55# define fseek(f, o, w) _fseeki64((f), (o), (w))
56#elif defined(HAVE_FSEEKO)
57# define fseek(f, o, w) fseeko((f), (o), (w))
58#endif
59
60/* Use fstat64 or _fstati64 for long file fstat if they exist. */
61#if defined(HAVE_FSTAT64) && (SIZEOF_OFF_T < 8)
62# define stat stat64
63# define fstat(f,s) fstat64((f), (s))
64#elif defined(HAVE__FSTATI64)
65# define stat _stati64
66# define fstat(f,s) _fstati64((f), (s))
67#endif
68
69/* Make sure S_ISREG is defined. */
70#ifndef S_ISREG
71# define S_ISREG(x) ((x) & _S_IFREG)
72#endif
73
74/* Use and prefer _fileno if it exists. */
75#ifdef HAVE__FILENO
76# define fileno(f) _fileno((f))
77#endif
78
79FILE *rs_file_open(char const *filename, char const *mode, int force)
80{
81 FILE *f;
82 int is_write;
83
84 is_write = mode[0] == 'w';
85
86 if (!filename || !strcmp("-", filename)) {
87 if (is_write) {
88#if _WIN32
89 _setmode(_fileno(stdout), _O_BINARY);
90#endif
91 return stdout;
92 } else {
93#if _WIN32
94 _setmode(_fileno(stdin), _O_BINARY);
95#endif
96 return stdin;
97 }
98 }
99
100 if (!force && is_write) {
101 if ((f = fopen(filename, "rb"))) {
102 // File exists
103 rs_error("File exists \"%s\", aborting!", filename);
104 fclose(f);
105 exit(RS_IO_ERROR);
106 }
107 }
108
109 if (!(f = fopen(filename, mode))) {
110 rs_error("Error opening \"%s\" for %s: %s", filename,
111 is_write ? "write" : "read", strerror(errno));
112 exit(RS_IO_ERROR);
113 }
114
115 return f;
116}
117
118int rs_file_close(FILE *f)
119{
120 if ((f == stdin) || (f == stdout))
121 return 0;
122 return fclose(f);
123}
124
125rs_long_t rs_file_size(FILE *f)
126{
127 struct stat st;
128 if ((fstat(fileno(f), &st) == 0) && (S_ISREG(st.st_mode)))
129 return st.st_size;
130 return -1;
131}
132
133rs_result rs_file_copy_cb(void *arg, rs_long_t pos, size_t *len, void **buf)
134{
135 FILE *f = (FILE *)arg;
136
137 if (fseek(f, pos, SEEK_SET)) {
138 rs_error("seek failed: %s", strerror(errno));
139 return RS_IO_ERROR;
140 }
141 *len = fread(*buf, 1, *len, f);
142 if (*len) {
143 return RS_DONE;
144 } else if (ferror(f)) {
145 rs_error("read error: %s", strerror(errno));
146 return RS_IO_ERROR;
147 } else {
148 rs_error("unexpected eof on fd%d", fileno(f));
149 return RS_INPUT_ENDED;
150 }
151}
Public header for librsync.
LIBRSYNC_EXPORT int rs_file_close(FILE *file)
Close a file with special handling for stdin or stdout.
Definition: fileutil.c:118
LIBRSYNC_EXPORT FILE * rs_file_open(char const *filename, char const *mode, int force)
Open a file with special handling for stdin or stdout.
Definition: fileutil.c:79
LIBRSYNC_EXPORT rs_long_t rs_file_size(FILE *file)
Get the size of a file.
Definition: fileutil.c:125
rs_result
Return codes from nonblocking rsync operations.
Definition: librsync.h:180
@ RS_DONE
Completed successfully.
Definition: librsync.h:181
@ RS_INPUT_ENDED
Unexpected end of input file, perhaps due to a truncated file or dropped network connection.
Definition: librsync.h:190
@ RS_IO_ERROR
Error in file or network IO.
Definition: librsync.h:187
LIBRSYNC_EXPORT rs_result rs_file_copy_cb(void *arg, rs_long_t pos, size_t *len, void **buf)
rs_copy_cb that reads from a stdio file.
Definition: fileutil.c:133
logging functions.