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f8370579 | 1 | /* |
0235b0db | 2 | * SPDX-License-Identifier: MIT |
f8370579 | 3 | * |
0235b0db | 4 | * Copyright 2012 (c) Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
f8370579 | 5 | * |
0235b0db | 6 | * memstream compatibility layer. |
f8370579 MD |
7 | */ |
8 | ||
0235b0db MJ |
9 | #ifndef _BABELTRACE_FORMAT_CTF_MEMSTREAM_H |
10 | #define _BABELTRACE_FORMAT_CTF_MEMSTREAM_H | |
11 | ||
f8370579 MD |
12 | #ifdef BABELTRACE_HAVE_FMEMOPEN |
13 | #include <stdio.h> | |
14 | ||
15 | static inline | |
0cbbc8b8 | 16 | FILE *bt_fmemopen(void *buf, size_t size, const char *mode) |
f8370579 MD |
17 | { |
18 | return fmemopen(buf, size, mode); | |
19 | } | |
20 | ||
21 | #else /* BABELTRACE_HAVE_FMEMOPEN */ | |
22 | ||
b8d6e1fc | 23 | #include <unistd.h> |
f8370579 MD |
24 | #include <stdlib.h> |
25 | #include <stdio.h> | |
b776eaa4 MJ |
26 | #include <string.h> |
27 | #include <errno.h> | |
578e048b | 28 | #include "compat/endian.h" |
b776eaa4 MJ |
29 | |
30 | #ifdef __MINGW32__ | |
31 | ||
32 | #include <io.h> | |
33 | #include <glib.h> | |
f8370579 MD |
34 | |
35 | /* | |
36 | * Fallback for systems which don't have fmemopen. Copy buffer to a | |
37 | * temporary file, and use that file as FILE * input. | |
38 | */ | |
39 | static inline | |
0cbbc8b8 | 40 | FILE *bt_fmemopen(void *buf, size_t size, const char *mode) |
f8370579 | 41 | { |
b776eaa4 | 42 | char *tmpname; |
f8370579 MD |
43 | size_t len; |
44 | FILE *fp; | |
45 | int ret; | |
46 | ||
47 | /* | |
48 | * Support reading only. | |
49 | */ | |
50 | if (strcmp(mode, "rb") != 0) { | |
51 | return NULL; | |
52 | } | |
b776eaa4 MJ |
53 | |
54 | /* Build a temporary filename */ | |
55 | tmpname = g_build_filename(g_get_tmp_dir(), "babeltrace-tmp-XXXXXX", NULL); | |
5084732e | 56 | if (!_mktemp(tmpname)) { |
b776eaa4 MJ |
57 | goto error_free; |
58 | } | |
59 | ||
60 | /* | |
61 | * Open as a read/write binary temporary deleted on close file. | |
62 | * Will be deleted when the last file pointer is closed. | |
63 | */ | |
64 | fp = fopen(tmpname, "w+bTD"); | |
65 | if (!fp) { | |
66 | goto error_free; | |
67 | } | |
68 | ||
69 | /* Copy the entire buffer to the file */ | |
70 | len = fwrite(buf, sizeof(char), size, fp); | |
71 | if (len != size) { | |
72 | goto error_close; | |
73 | } | |
74 | ||
75 | /* Set the file pointer to the start of file */ | |
76 | ret = fseek(fp, 0L, SEEK_SET); | |
77 | if (ret < 0) { | |
78 | perror("fseek"); | |
79 | goto error_close; | |
80 | } | |
81 | ||
82 | g_free(tmpname); | |
83 | return fp; | |
84 | ||
85 | error_close: | |
86 | ret = fclose(fp); | |
87 | if (ret < 0) { | |
88 | perror("close"); | |
89 | } | |
90 | error_free: | |
91 | g_free(tmpname); | |
92 | return NULL; | |
93 | } | |
94 | ||
95 | #else /* __MINGW32__ */ | |
96 | ||
97 | /* | |
98 | * Fallback for systems which don't have fmemopen. Copy buffer to a | |
99 | * temporary file, and use that file as FILE * input. | |
100 | */ | |
101 | static inline | |
102 | FILE *bt_fmemopen(void *buf, size_t size, const char *mode) | |
103 | { | |
104 | char *tmpname; | |
105 | size_t len; | |
106 | FILE *fp; | |
107 | int ret; | |
108 | ||
109 | /* | |
110 | * Support reading only. | |
111 | */ | |
112 | if (strcmp(mode, "rb") != 0) { | |
113 | return NULL; | |
114 | } | |
115 | ||
116 | tmpname = g_build_filename(g_get_tmp_dir(), "babeltrace-tmp-XXXXXX", NULL); | |
f8370579 MD |
117 | ret = mkstemp(tmpname); |
118 | if (ret < 0) { | |
b776eaa4 | 119 | g_free(tmpname); |
f8370579 MD |
120 | return NULL; |
121 | } | |
122 | /* | |
123 | * We need to write to the file. | |
124 | */ | |
7eb22883 | 125 | fp = fdopen(ret, "wb+"); |
f8370579 MD |
126 | if (!fp) { |
127 | goto error_unlink; | |
128 | } | |
129 | /* Copy the entire buffer to the file */ | |
130 | len = fwrite(buf, sizeof(char), size, fp); | |
131 | if (len != size) { | |
132 | goto error_close; | |
133 | } | |
134 | ret = fseek(fp, 0L, SEEK_SET); | |
135 | if (ret < 0) { | |
136 | perror("fseek"); | |
137 | goto error_close; | |
138 | } | |
139 | /* We keep the handle open, but can unlink the file on the VFS. */ | |
140 | ret = unlink(tmpname); | |
141 | if (ret < 0) { | |
142 | perror("unlink"); | |
143 | } | |
b776eaa4 | 144 | g_free(tmpname); |
f8370579 MD |
145 | return fp; |
146 | ||
147 | error_close: | |
148 | ret = fclose(fp); | |
149 | if (ret < 0) { | |
150 | perror("close"); | |
151 | } | |
152 | error_unlink: | |
153 | ret = unlink(tmpname); | |
154 | if (ret < 0) { | |
155 | perror("unlink"); | |
156 | } | |
b776eaa4 | 157 | g_free(tmpname); |
f8370579 MD |
158 | return NULL; |
159 | } | |
160 | ||
b776eaa4 MJ |
161 | #endif /* __MINGW32__ */ |
162 | ||
f8370579 MD |
163 | #endif /* BABELTRACE_HAVE_FMEMOPEN */ |
164 | ||
b776eaa4 | 165 | |
f8370579 MD |
166 | #ifdef BABELTRACE_HAVE_OPEN_MEMSTREAM |
167 | ||
168 | #include <stdio.h> | |
169 | ||
170 | static inline | |
0cbbc8b8 | 171 | FILE *bt_open_memstream(char **ptr, size_t *sizeloc) |
f8370579 MD |
172 | { |
173 | return open_memstream(ptr, sizeloc); | |
174 | } | |
175 | ||
176 | static inline | |
0cbbc8b8 | 177 | int bt_close_memstream(char **buf, size_t *size, FILE *fp) |
f8370579 MD |
178 | { |
179 | return fclose(fp); | |
180 | } | |
181 | ||
182 | #else /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
183 | ||
184 | #include <stdlib.h> | |
185 | #include <stdio.h> | |
b776eaa4 MJ |
186 | #include <glib.h> |
187 | ||
188 | #ifdef __MINGW32__ | |
189 | ||
190 | /* | |
191 | * Fallback for systems which don't have open_memstream. Create FILE * | |
192 | * with bt_open_memstream, but require call to | |
193 | * bt_close_memstream to flush all data written to the FILE * | |
194 | * into the buffer (which we allocate). | |
195 | */ | |
196 | static inline | |
197 | FILE *bt_open_memstream(char **ptr, size_t *sizeloc) | |
198 | { | |
199 | char *tmpname; | |
200 | FILE *fp; | |
201 | ||
202 | tmpname = g_build_filename(g_get_tmp_dir(), "babeltrace-tmp-XXXXXX", NULL); | |
203 | ||
5084732e | 204 | if (!_mktemp(tmpname)) { |
b776eaa4 MJ |
205 | goto error_free; |
206 | } | |
207 | ||
208 | /* | |
209 | * Open as a read/write binary temporary deleted on close file. | |
210 | * Will be deleted when the last file pointer is closed. | |
211 | */ | |
212 | fp = fopen(tmpname, "w+bTD"); | |
213 | if (!fp) { | |
214 | goto error_free; | |
215 | } | |
216 | ||
217 | g_free(tmpname); | |
218 | return fp; | |
219 | ||
220 | error_free: | |
221 | g_free(tmpname); | |
222 | return NULL; | |
223 | } | |
224 | ||
225 | #else /* __MINGW32__ */ | |
f8370579 MD |
226 | |
227 | /* | |
228 | * Fallback for systems which don't have open_memstream. Create FILE * | |
0cbbc8b8 MJ |
229 | * with bt_open_memstream, but require call to |
230 | * bt_close_memstream to flush all data written to the FILE * | |
f8370579 MD |
231 | * into the buffer (which we allocate). |
232 | */ | |
233 | static inline | |
0cbbc8b8 | 234 | FILE *bt_open_memstream(char **ptr, size_t *sizeloc) |
f8370579 | 235 | { |
b776eaa4 | 236 | char *tmpname; |
f8370579 MD |
237 | int ret; |
238 | FILE *fp; | |
239 | ||
b776eaa4 MJ |
240 | tmpname = g_build_filename(g_get_tmp_dir(), "babeltrace-tmp-XXXXXX", NULL); |
241 | ||
f8370579 MD |
242 | ret = mkstemp(tmpname); |
243 | if (ret < 0) { | |
b776eaa4 MJ |
244 | perror("mkstemp"); |
245 | g_free(tmpname); | |
f8370579 MD |
246 | return NULL; |
247 | } | |
7eb22883 | 248 | fp = fdopen(ret, "wb+"); |
f8370579 MD |
249 | if (!fp) { |
250 | goto error_unlink; | |
251 | } | |
252 | /* | |
253 | * babeltrace_flush_memstream will update the buffer content | |
254 | * with read from fp. No need to keep the file around, just the | |
255 | * handle. | |
256 | */ | |
257 | ret = unlink(tmpname); | |
258 | if (ret < 0) { | |
259 | perror("unlink"); | |
260 | } | |
b776eaa4 | 261 | g_free(tmpname); |
f8370579 MD |
262 | return fp; |
263 | ||
264 | error_unlink: | |
265 | ret = unlink(tmpname); | |
266 | if (ret < 0) { | |
267 | perror("unlink"); | |
268 | } | |
b776eaa4 | 269 | g_free(tmpname); |
f8370579 MD |
270 | return NULL; |
271 | } | |
272 | ||
b776eaa4 MJ |
273 | #endif /* __MINGW32__ */ |
274 | ||
f8370579 MD |
275 | /* Get file size, allocate buffer, copy. */ |
276 | static inline | |
0cbbc8b8 | 277 | int bt_close_memstream(char **buf, size_t *size, FILE *fp) |
f8370579 MD |
278 | { |
279 | size_t len, n; | |
280 | long pos; | |
281 | int ret; | |
282 | ||
283 | ret = fflush(fp); | |
284 | if (ret < 0) { | |
285 | perror("fflush"); | |
286 | return ret; | |
287 | } | |
288 | ret = fseek(fp, 0L, SEEK_END); | |
289 | if (ret < 0) { | |
290 | perror("fseek"); | |
291 | return ret; | |
292 | } | |
293 | pos = ftell(fp); | |
294 | if (ret < 0) { | |
295 | perror("ftell"); | |
296 | return ret; | |
297 | } | |
298 | *size = pos; | |
299 | /* add final \0 */ | |
300 | *buf = calloc(pos + 1, sizeof(char)); | |
301 | if (!*buf) { | |
302 | return -ENOMEM; | |
303 | } | |
304 | ret = fseek(fp, 0L, SEEK_SET); | |
305 | if (ret < 0) { | |
306 | perror("fseek"); | |
307 | goto error_free; | |
308 | } | |
309 | /* Copy the entire file into the buffer */ | |
310 | n = 0; | |
311 | clearerr(fp); | |
312 | while (!feof(fp) && !ferror(fp) && (*size - n > 0)) { | |
313 | len = fread(*buf, sizeof(char), *size - n, fp); | |
314 | n += len; | |
315 | } | |
316 | if (n != *size) { | |
317 | ret = -1; | |
318 | goto error_close; | |
319 | } | |
320 | ret = fclose(fp); | |
321 | if (ret < 0) { | |
322 | perror("fclose"); | |
323 | return ret; | |
324 | } | |
325 | return 0; | |
326 | ||
327 | error_close: | |
328 | ret = fclose(fp); | |
329 | if (ret < 0) { | |
330 | perror("fclose"); | |
331 | } | |
332 | error_free: | |
333 | free(*buf); | |
334 | *buf = NULL; | |
335 | return ret; | |
336 | } | |
337 | ||
338 | #endif /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
339 | ||
340 | #endif /* _BABELTRACE_FORMAT_CTF_MEMSTREAM_H */ |