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f8370579 MD |
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 | * | |
eb31c5e6 MD |
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: | |
f8370579 | 17 | * |
eb31c5e6 MD |
18 | * The above copyright notice and this permission notice shall be included in |
19 | * all copies or substantial portions of the Software. | |
c462e188 MD |
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. | |
f8370579 MD |
28 | */ |
29 | ||
f8370579 MD |
30 | #ifdef BABELTRACE_HAVE_FMEMOPEN |
31 | #include <stdio.h> | |
32 | ||
33 | static inline | |
0cbbc8b8 | 34 | FILE *bt_fmemopen(void *buf, size_t size, const char *mode) |
f8370579 MD |
35 | { |
36 | return fmemopen(buf, size, mode); | |
37 | } | |
38 | ||
39 | #else /* BABELTRACE_HAVE_FMEMOPEN */ | |
40 | ||
41 | #include <stdlib.h> | |
42 | #include <stdio.h> | |
43 | ||
44 | /* | |
45 | * Fallback for systems which don't have fmemopen. Copy buffer to a | |
46 | * temporary file, and use that file as FILE * input. | |
47 | */ | |
48 | static inline | |
0cbbc8b8 | 49 | FILE *bt_fmemopen(void *buf, size_t size, const char *mode) |
f8370579 MD |
50 | { |
51 | char tmpname[PATH_MAX]; | |
52 | size_t len; | |
53 | FILE *fp; | |
54 | int ret; | |
55 | ||
56 | /* | |
57 | * Support reading only. | |
58 | */ | |
59 | if (strcmp(mode, "rb") != 0) { | |
60 | return NULL; | |
61 | } | |
62 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); | |
63 | ret = mkstemp(tmpname); | |
64 | if (ret < 0) { | |
65 | return NULL; | |
66 | } | |
67 | /* | |
68 | * We need to write to the file. | |
69 | */ | |
70 | fp = fdopen(ret, "w+"); | |
71 | if (!fp) { | |
72 | goto error_unlink; | |
73 | } | |
74 | /* Copy the entire buffer to the file */ | |
75 | len = fwrite(buf, sizeof(char), size, fp); | |
76 | if (len != size) { | |
77 | goto error_close; | |
78 | } | |
79 | ret = fseek(fp, 0L, SEEK_SET); | |
80 | if (ret < 0) { | |
81 | perror("fseek"); | |
82 | goto error_close; | |
83 | } | |
84 | /* We keep the handle open, but can unlink the file on the VFS. */ | |
85 | ret = unlink(tmpname); | |
86 | if (ret < 0) { | |
87 | perror("unlink"); | |
88 | } | |
89 | return fp; | |
90 | ||
91 | error_close: | |
92 | ret = fclose(fp); | |
93 | if (ret < 0) { | |
94 | perror("close"); | |
95 | } | |
96 | error_unlink: | |
97 | ret = unlink(tmpname); | |
98 | if (ret < 0) { | |
99 | perror("unlink"); | |
100 | } | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | #endif /* BABELTRACE_HAVE_FMEMOPEN */ | |
105 | ||
106 | #ifdef BABELTRACE_HAVE_OPEN_MEMSTREAM | |
107 | ||
108 | #include <stdio.h> | |
109 | ||
110 | static inline | |
0cbbc8b8 | 111 | FILE *bt_open_memstream(char **ptr, size_t *sizeloc) |
f8370579 MD |
112 | { |
113 | return open_memstream(ptr, sizeloc); | |
114 | } | |
115 | ||
116 | static inline | |
0cbbc8b8 | 117 | int bt_close_memstream(char **buf, size_t *size, FILE *fp) |
f8370579 MD |
118 | { |
119 | return fclose(fp); | |
120 | } | |
121 | ||
122 | #else /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
123 | ||
124 | #include <stdlib.h> | |
125 | #include <stdio.h> | |
126 | ||
127 | /* | |
128 | * Fallback for systems which don't have open_memstream. Create FILE * | |
0cbbc8b8 MJ |
129 | * with bt_open_memstream, but require call to |
130 | * bt_close_memstream to flush all data written to the FILE * | |
f8370579 MD |
131 | * into the buffer (which we allocate). |
132 | */ | |
133 | static inline | |
0cbbc8b8 | 134 | FILE *bt_open_memstream(char **ptr, size_t *sizeloc) |
f8370579 MD |
135 | { |
136 | char tmpname[PATH_MAX]; | |
137 | int ret; | |
138 | FILE *fp; | |
139 | ||
140 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); | |
141 | ret = mkstemp(tmpname); | |
142 | if (ret < 0) { | |
143 | return NULL; | |
144 | } | |
145 | fp = fdopen(ret, "w+"); | |
146 | if (!fp) { | |
147 | goto error_unlink; | |
148 | } | |
149 | /* | |
150 | * babeltrace_flush_memstream will update the buffer content | |
151 | * with read from fp. No need to keep the file around, just the | |
152 | * handle. | |
153 | */ | |
154 | ret = unlink(tmpname); | |
155 | if (ret < 0) { | |
156 | perror("unlink"); | |
157 | } | |
158 | return fp; | |
159 | ||
160 | error_unlink: | |
161 | ret = unlink(tmpname); | |
162 | if (ret < 0) { | |
163 | perror("unlink"); | |
164 | } | |
165 | return NULL; | |
166 | } | |
167 | ||
168 | /* Get file size, allocate buffer, copy. */ | |
169 | static inline | |
0cbbc8b8 | 170 | int bt_close_memstream(char **buf, size_t *size, FILE *fp) |
f8370579 MD |
171 | { |
172 | size_t len, n; | |
173 | long pos; | |
174 | int ret; | |
175 | ||
176 | ret = fflush(fp); | |
177 | if (ret < 0) { | |
178 | perror("fflush"); | |
179 | return ret; | |
180 | } | |
181 | ret = fseek(fp, 0L, SEEK_END); | |
182 | if (ret < 0) { | |
183 | perror("fseek"); | |
184 | return ret; | |
185 | } | |
186 | pos = ftell(fp); | |
187 | if (ret < 0) { | |
188 | perror("ftell"); | |
189 | return ret; | |
190 | } | |
191 | *size = pos; | |
192 | /* add final \0 */ | |
193 | *buf = calloc(pos + 1, sizeof(char)); | |
194 | if (!*buf) { | |
195 | return -ENOMEM; | |
196 | } | |
197 | ret = fseek(fp, 0L, SEEK_SET); | |
198 | if (ret < 0) { | |
199 | perror("fseek"); | |
200 | goto error_free; | |
201 | } | |
202 | /* Copy the entire file into the buffer */ | |
203 | n = 0; | |
204 | clearerr(fp); | |
205 | while (!feof(fp) && !ferror(fp) && (*size - n > 0)) { | |
206 | len = fread(*buf, sizeof(char), *size - n, fp); | |
207 | n += len; | |
208 | } | |
209 | if (n != *size) { | |
210 | ret = -1; | |
211 | goto error_close; | |
212 | } | |
213 | ret = fclose(fp); | |
214 | if (ret < 0) { | |
215 | perror("fclose"); | |
216 | return ret; | |
217 | } | |
218 | return 0; | |
219 | ||
220 | error_close: | |
221 | ret = fclose(fp); | |
222 | if (ret < 0) { | |
223 | perror("fclose"); | |
224 | } | |
225 | error_free: | |
226 | free(*buf); | |
227 | *buf = NULL; | |
228 | return ret; | |
229 | } | |
230 | ||
231 | #endif /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
232 | ||
233 | #endif /* _BABELTRACE_FORMAT_CTF_MEMSTREAM_H */ |