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annotate include/jeffpc/io.h @ 814:be934c5f8a42

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io: add write_file_at Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
author Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
date Sat, 29 Aug 2020 12:00:28 -0400
parents 1b1a7ac50c23
children a445315f2016
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1 /*
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2 * Copyright (c) 2011-2020 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining a copy
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5 * of this software and associated documentation files (the "Software"), to deal
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6 * in the Software without restriction, including without limitation the rights
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7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 * copies of the Software, and to permit persons to whom the Software is
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9 * furnished to do so, subject to the following conditions:
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10 *
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11 * The above copyright notice and this permission notice shall be included in
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12 * all copies or substantial portions of the Software.
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13 *
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14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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20 * SOFTWARE.
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21 */
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22
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23 #ifndef __JEFFPC_IO_H
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24 #define __JEFFPC_IO_H
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25
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26 #include <sys/types.h>
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27 #include <sys/stat.h>
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28 #include <unistd.h>
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29 #include <fcntl.h>
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30 #include <string.h>
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31
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32 #include <jeffpc/error.h>
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33
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34 /*
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35 * An incomplete read/write is considered an error.
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36 */
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37 extern int xread(int fd, void *buf, size_t nbyte);
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38 extern int xwrite(int fd, const void *buf, size_t nbyte);
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39 extern int xpread(int fd, void *buf, size_t nbyte, off_t off);
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40 extern int xpwrite(int fd, const void *buf, size_t nbyte, off_t off);
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41
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42 extern char *read_file_common(int dirfd, const char *fname, struct stat *sb);
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43 extern int write_file_at(int dirfd, const char *fname, const char *data,
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44 size_t len);
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46 static inline int xwrite_str(int fd, const char *s)
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47 {
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48 return xwrite(fd, s, strlen(s));
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49 }
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50
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51 static inline char *read_file(const char *fname)
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52 {
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53 return read_file_common(AT_FDCWD, fname, NULL);
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54 }
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55
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56 static inline char *read_file_at(int dirfd, const char *fname)
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57 {
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58 return read_file_common(dirfd, fname, NULL);
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59 }
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60
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61 static inline char *read_file_len(const char *fname, size_t *len)
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62 {
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63 struct stat sb;
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64 char *ret;
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65
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66 ret = read_file_common(AT_FDCWD, fname, &sb);
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67 if (!IS_ERR(ret))
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68 *len = sb.st_size;
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69
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70 return ret;
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71 }
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72
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73 static inline int write_file(const char *fname, const void *data, size_t len)
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74 {
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75 return write_file_at(AT_FDCWD, fname, data, len);
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76 }
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77
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78 static inline int xopen(const char *fname, int flags, mode_t mode)
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79 {
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80 int fd;
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81
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82 fd = open(fname, flags, mode);
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83 return (fd == -1) ? -errno : fd;
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84 }
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85
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86 static inline int xopenat(int dirfd, const char *fname, int flags, mode_t mode)
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87 {
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88 int fd;
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89
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90 fd = openat(dirfd, fname, flags, mode);
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91 return (fd == -1) ? -errno : fd;
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92 }
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93
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94 static inline int xclose(int fd)
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95 {
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96 if (close(fd) == -1)
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97 return -errno;
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98 return 0;
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99 }
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100
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101 static inline int xstat(const char *restrict path, struct stat *restrict buf)
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102 {
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103 if (stat(path, buf) == -1)
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104 return -errno;
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105 return 0;
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106 }
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107
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108 static inline int xfstat(int fd, struct stat *restrict buf)
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109 {
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110 if (fstat(fd, buf) == -1)
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111 return -errno;
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112 return 0;
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113 }
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114
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115 static inline int xlstat(const char *restrict path, struct stat *restrict buf)
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116 {
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117 if (lstat(path, buf) == -1)
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118 return -errno;
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119 return 0;
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120 }
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121
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122 static inline int xmkdir(const char *path, mode_t mode)
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123 {
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124 if (mkdir(path, mode) == -1)
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parents: 21
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125 return -errno;
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parents: 21
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126 return 0;
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parents: 21
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127 }
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parents: 21
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128
216
c7dbc3196ba5 io: add xmkdirat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 116
diff changeset
129 static inline int xmkdirat(int dirfd, const char *path, mode_t mode)
c7dbc3196ba5 io: add xmkdirat
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parents: 116
diff changeset
130 {
c7dbc3196ba5 io: add xmkdirat
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parents: 116
diff changeset
131 if (mkdirat(dirfd, path, mode) == -1)
c7dbc3196ba5 io: add xmkdirat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 116
diff changeset
132 return -errno;
c7dbc3196ba5 io: add xmkdirat
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parents: 116
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133 return 0;
c7dbc3196ba5 io: add xmkdirat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 116
diff changeset
134 }
c7dbc3196ba5 io: add xmkdirat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 116
diff changeset
135
66
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
136 static inline int xrename(const char *old, const char *new)
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
137 {
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
138 if (rename(old, new) == -1)
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
139 return -errno;
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parents: 21
diff changeset
140 return 0;
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Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
141 }
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
142
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
143 static inline int xunlink(const char *path)
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
144 {
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Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
145 if (unlink(path) == -1)
ccf2206c4b35 io: wrap {stat,lstat,mkdir,rename,unlink} syscalls
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
146 return -errno;
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Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
147 return 0;
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Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
148 }
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Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 21
diff changeset
149
102
f9c7df13deda io: add xunlinkat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 101
diff changeset
150 static inline int xunlinkat(int dirfd, const char *path, int flag)
f9c7df13deda io: add xunlinkat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 101
diff changeset
151 {
f9c7df13deda io: add xunlinkat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 101
diff changeset
152 if (unlinkat(dirfd, path, flag) == -1)
f9c7df13deda io: add xunlinkat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 101
diff changeset
153 return -errno;
f9c7df13deda io: add xunlinkat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 101
diff changeset
154 return 0;
f9c7df13deda io: add xunlinkat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 101
diff changeset
155 }
f9c7df13deda io: add xunlinkat
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 101
diff changeset
156
101
8139e2a17ef2 io: add xftruncate
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 100
diff changeset
157 static inline int xftruncate(int fd, off_t len)
8139e2a17ef2 io: add xftruncate
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 100
diff changeset
158 {
8139e2a17ef2 io: add xftruncate
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 100
diff changeset
159 if (ftruncate(fd, len) == -1)
8139e2a17ef2 io: add xftruncate
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 100
diff changeset
160 return -errno;
8139e2a17ef2 io: add xftruncate
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 100
diff changeset
161 return 0;
8139e2a17ef2 io: add xftruncate
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 100
diff changeset
162 }
8139e2a17ef2 io: add xftruncate
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 100
diff changeset
163
411
0e9a91b64d6a io: add xfsync
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 216
diff changeset
164 static inline int xfsync(int fd)
0e9a91b64d6a io: add xfsync
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 216
diff changeset
165 {
0e9a91b64d6a io: add xfsync
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 216
diff changeset
166 if (fsync(fd) == -1)
0e9a91b64d6a io: add xfsync
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 216
diff changeset
167 return -errno;
0e9a91b64d6a io: add xfsync
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 216
diff changeset
168 return 0;
0e9a91b64d6a io: add xfsync
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 216
diff changeset
169 }
0e9a91b64d6a io: add xfsync
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents: 216
diff changeset
170
14
33b45c955db2 io: safe file reading & writing functions
Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
parents:
diff changeset
171 #endif