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1 | #ifndef _BABELTRACE_FORMAT_CTF_MEMSTREAM_H |
2 | #define _BABELTRACE_FORMAT_CTF_MEMSTREAM_H | |
3 | ||
4 | /* | |
5 | * format/ctf/memstream.h | |
6 | * | |
7 | * Copyright 2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
8 | * | |
9 | * memstream compatibility layer. | |
10 | * | |
11 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
12 | * of this software and associated documentation files (the "Software"), to deal | |
13 | * in the Software without restriction, including without limitation the rights | |
14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
15 | * copies of the Software, and to permit persons to whom the Software is | |
16 | * furnished to do so, subject to the following conditions: | |
17 | * | |
18 | * The above copyright notice and this permission notice shall be included in | |
19 | * all copies or substantial portions of the Software. | |
20 | * | |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
27 | * SOFTWARE. | |
28 | */ | |
29 | ||
30 | #define _GNU_SOURCE | |
31 | #include <config.h> | |
32 | ||
33 | #ifdef BABELTRACE_HAVE_FMEMOPEN | |
34 | #include <stdio.h> | |
35 | ||
36 | static inline | |
37 | FILE *babeltrace_fmemopen(void *buf, size_t size, const char *mode) | |
38 | { | |
39 | return fmemopen(buf, size, mode); | |
40 | } | |
41 | ||
42 | #else /* BABELTRACE_HAVE_FMEMOPEN */ | |
43 | ||
44 | #include <stdlib.h> | |
45 | #include <stdio.h> | |
46 | ||
47 | /* | |
48 | * Fallback for systems which don't have fmemopen. Copy buffer to a | |
49 | * temporary file, and use that file as FILE * input. | |
50 | */ | |
51 | static inline | |
52 | FILE *babeltrace_fmemopen(void *buf, size_t size, const char *mode) | |
53 | { | |
54 | char tmpname[PATH_MAX]; | |
55 | size_t len; | |
56 | FILE *fp; | |
57 | int ret; | |
58 | ||
59 | /* | |
60 | * Support reading only. | |
61 | */ | |
62 | if (strcmp(mode, "rb") != 0) { | |
63 | return NULL; | |
64 | } | |
65 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); | |
66 | ret = mkstemp(tmpname); | |
67 | if (ret < 0) { | |
68 | return NULL; | |
69 | } | |
70 | /* | |
71 | * We need to write to the file. | |
72 | */ | |
73 | fp = fdopen(ret, "w+"); | |
74 | if (!fp) { | |
75 | goto error_unlink; | |
76 | } | |
77 | /* Copy the entire buffer to the file */ | |
78 | len = fwrite(buf, sizeof(char), size, fp); | |
79 | if (len != size) { | |
80 | goto error_close; | |
81 | } | |
82 | ret = fseek(fp, 0L, SEEK_SET); | |
83 | if (ret < 0) { | |
84 | perror("fseek"); | |
85 | goto error_close; | |
86 | } | |
87 | /* We keep the handle open, but can unlink the file on the VFS. */ | |
88 | ret = unlink(tmpname); | |
89 | if (ret < 0) { | |
90 | perror("unlink"); | |
91 | } | |
92 | return fp; | |
93 | ||
94 | error_close: | |
95 | ret = fclose(fp); | |
96 | if (ret < 0) { | |
97 | perror("close"); | |
98 | } | |
99 | error_unlink: | |
100 | ret = unlink(tmpname); | |
101 | if (ret < 0) { | |
102 | perror("unlink"); | |
103 | } | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | #endif /* BABELTRACE_HAVE_FMEMOPEN */ | |
108 | ||
109 | #ifdef BABELTRACE_HAVE_OPEN_MEMSTREAM | |
110 | ||
111 | #include <stdio.h> | |
112 | ||
113 | static inline | |
114 | FILE *babeltrace_open_memstream(char **ptr, size_t *sizeloc) | |
115 | { | |
116 | return open_memstream(ptr, sizeloc); | |
117 | } | |
118 | ||
119 | static inline | |
120 | int babeltrace_close_memstream(char **buf, size_t *size, FILE *fp) | |
121 | { | |
122 | return fclose(fp); | |
123 | } | |
124 | ||
125 | #else /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
126 | ||
127 | #include <stdlib.h> | |
128 | #include <stdio.h> | |
129 | ||
130 | /* | |
131 | * Fallback for systems which don't have open_memstream. Create FILE * | |
132 | * with babeltrace_open_memstream, but require call to | |
133 | * babeltrace_close_memstream to flush all data written to the FILE * | |
134 | * into the buffer (which we allocate). | |
135 | */ | |
136 | static inline | |
137 | FILE *babeltrace_open_memstream(char **ptr, size_t *sizeloc) | |
138 | { | |
139 | char tmpname[PATH_MAX]; | |
140 | int ret; | |
141 | FILE *fp; | |
142 | ||
143 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); | |
144 | ret = mkstemp(tmpname); | |
145 | if (ret < 0) { | |
146 | return NULL; | |
147 | } | |
148 | fp = fdopen(ret, "w+"); | |
149 | if (!fp) { | |
150 | goto error_unlink; | |
151 | } | |
152 | /* | |
153 | * babeltrace_flush_memstream will update the buffer content | |
154 | * with read from fp. No need to keep the file around, just the | |
155 | * handle. | |
156 | */ | |
157 | ret = unlink(tmpname); | |
158 | if (ret < 0) { | |
159 | perror("unlink"); | |
160 | } | |
161 | return fp; | |
162 | ||
163 | error_unlink: | |
164 | ret = unlink(tmpname); | |
165 | if (ret < 0) { | |
166 | perror("unlink"); | |
167 | } | |
168 | return NULL; | |
169 | } | |
170 | ||
171 | /* Get file size, allocate buffer, copy. */ | |
172 | static inline | |
173 | int babeltrace_close_memstream(char **buf, size_t *size, FILE *fp) | |
174 | { | |
175 | size_t len, n; | |
176 | long pos; | |
177 | int ret; | |
178 | ||
179 | ret = fflush(fp); | |
180 | if (ret < 0) { | |
181 | perror("fflush"); | |
182 | return ret; | |
183 | } | |
184 | ret = fseek(fp, 0L, SEEK_END); | |
185 | if (ret < 0) { | |
186 | perror("fseek"); | |
187 | return ret; | |
188 | } | |
189 | pos = ftell(fp); | |
190 | if (ret < 0) { | |
191 | perror("ftell"); | |
192 | return ret; | |
193 | } | |
194 | *size = pos; | |
195 | /* add final \0 */ | |
196 | *buf = calloc(pos + 1, sizeof(char)); | |
197 | if (!*buf) { | |
198 | return -ENOMEM; | |
199 | } | |
200 | ret = fseek(fp, 0L, SEEK_SET); | |
201 | if (ret < 0) { | |
202 | perror("fseek"); | |
203 | goto error_free; | |
204 | } | |
205 | /* Copy the entire file into the buffer */ | |
206 | n = 0; | |
207 | clearerr(fp); | |
208 | while (!feof(fp) && !ferror(fp) && (*size - n > 0)) { | |
209 | len = fread(*buf, sizeof(char), *size - n, fp); | |
210 | n += len; | |
211 | } | |
212 | if (n != *size) { | |
213 | ret = -1; | |
214 | goto error_close; | |
215 | } | |
216 | ret = fclose(fp); | |
217 | if (ret < 0) { | |
218 | perror("fclose"); | |
219 | return ret; | |
220 | } | |
221 | return 0; | |
222 | ||
223 | error_close: | |
224 | ret = fclose(fp); | |
225 | if (ret < 0) { | |
226 | perror("fclose"); | |
227 | } | |
228 | error_free: | |
229 | free(*buf); | |
230 | *buf = NULL; | |
231 | return ret; | |
232 | } | |
233 | ||
234 | #endif /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
235 | ||
236 | #endif /* _BABELTRACE_FORMAT_CTF_MEMSTREAM_H */ |