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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 | * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED | |
12 | * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. | |
13 | * | |
14 | * Permission is hereby granted to use or copy this program | |
15 | * for any purpose, provided the above notices are retained on all copies. | |
16 | * Permission to modify the code and to distribute modified code is granted, | |
17 | * provided the above notices are retained, and a notice that the code was | |
18 | * modified is included with the above copyright notice. | |
19 | */ | |
20 | ||
21 | #define _GNU_SOURCE | |
22 | #include <config.h> | |
23 | ||
24 | #ifdef BABELTRACE_HAVE_FMEMOPEN | |
25 | #include <stdio.h> | |
26 | ||
27 | static inline | |
28 | FILE *babeltrace_fmemopen(void *buf, size_t size, const char *mode) | |
29 | { | |
30 | return fmemopen(buf, size, mode); | |
31 | } | |
32 | ||
33 | #else /* BABELTRACE_HAVE_FMEMOPEN */ | |
34 | ||
35 | #include <stdlib.h> | |
36 | #include <stdio.h> | |
37 | ||
38 | /* | |
39 | * Fallback for systems which don't have fmemopen. Copy buffer to a | |
40 | * temporary file, and use that file as FILE * input. | |
41 | */ | |
42 | static inline | |
43 | FILE *babeltrace_fmemopen(void *buf, size_t size, const char *mode) | |
44 | { | |
45 | char tmpname[PATH_MAX]; | |
46 | size_t len; | |
47 | FILE *fp; | |
48 | int ret; | |
49 | ||
50 | /* | |
51 | * Support reading only. | |
52 | */ | |
53 | if (strcmp(mode, "rb") != 0) { | |
54 | return NULL; | |
55 | } | |
56 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); | |
57 | ret = mkstemp(tmpname); | |
58 | if (ret < 0) { | |
59 | return NULL; | |
60 | } | |
61 | /* | |
62 | * We need to write to the file. | |
63 | */ | |
64 | fp = fdopen(ret, "w+"); | |
65 | if (!fp) { | |
66 | goto error_unlink; | |
67 | } | |
68 | /* Copy the entire buffer to the file */ | |
69 | len = fwrite(buf, sizeof(char), size, fp); | |
70 | if (len != size) { | |
71 | goto error_close; | |
72 | } | |
73 | ret = fseek(fp, 0L, SEEK_SET); | |
74 | if (ret < 0) { | |
75 | perror("fseek"); | |
76 | goto error_close; | |
77 | } | |
78 | /* We keep the handle open, but can unlink the file on the VFS. */ | |
79 | ret = unlink(tmpname); | |
80 | if (ret < 0) { | |
81 | perror("unlink"); | |
82 | } | |
83 | return fp; | |
84 | ||
85 | error_close: | |
86 | ret = fclose(fp); | |
87 | if (ret < 0) { | |
88 | perror("close"); | |
89 | } | |
90 | error_unlink: | |
91 | ret = unlink(tmpname); | |
92 | if (ret < 0) { | |
93 | perror("unlink"); | |
94 | } | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | #endif /* BABELTRACE_HAVE_FMEMOPEN */ | |
99 | ||
100 | #ifdef BABELTRACE_HAVE_OPEN_MEMSTREAM | |
101 | ||
102 | #include <stdio.h> | |
103 | ||
104 | static inline | |
105 | FILE *babeltrace_open_memstream(char **ptr, size_t *sizeloc) | |
106 | { | |
107 | return open_memstream(ptr, sizeloc); | |
108 | } | |
109 | ||
110 | static inline | |
111 | int babeltrace_close_memstream(char **buf, size_t *size, FILE *fp) | |
112 | { | |
113 | return fclose(fp); | |
114 | } | |
115 | ||
116 | #else /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
117 | ||
118 | #include <stdlib.h> | |
119 | #include <stdio.h> | |
120 | ||
121 | /* | |
122 | * Fallback for systems which don't have open_memstream. Create FILE * | |
123 | * with babeltrace_open_memstream, but require call to | |
124 | * babeltrace_close_memstream to flush all data written to the FILE * | |
125 | * into the buffer (which we allocate). | |
126 | */ | |
127 | static inline | |
128 | FILE *babeltrace_open_memstream(char **ptr, size_t *sizeloc) | |
129 | { | |
130 | char tmpname[PATH_MAX]; | |
131 | int ret; | |
132 | FILE *fp; | |
133 | ||
134 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); | |
135 | ret = mkstemp(tmpname); | |
136 | if (ret < 0) { | |
137 | return NULL; | |
138 | } | |
139 | fp = fdopen(ret, "w+"); | |
140 | if (!fp) { | |
141 | goto error_unlink; | |
142 | } | |
143 | /* | |
144 | * babeltrace_flush_memstream will update the buffer content | |
145 | * with read from fp. No need to keep the file around, just the | |
146 | * handle. | |
147 | */ | |
148 | ret = unlink(tmpname); | |
149 | if (ret < 0) { | |
150 | perror("unlink"); | |
151 | } | |
152 | return fp; | |
153 | ||
154 | error_unlink: | |
155 | ret = unlink(tmpname); | |
156 | if (ret < 0) { | |
157 | perror("unlink"); | |
158 | } | |
159 | return NULL; | |
160 | } | |
161 | ||
162 | /* Get file size, allocate buffer, copy. */ | |
163 | static inline | |
164 | int babeltrace_close_memstream(char **buf, size_t *size, FILE *fp) | |
165 | { | |
166 | size_t len, n; | |
167 | long pos; | |
168 | int ret; | |
169 | ||
170 | ret = fflush(fp); | |
171 | if (ret < 0) { | |
172 | perror("fflush"); | |
173 | return ret; | |
174 | } | |
175 | ret = fseek(fp, 0L, SEEK_END); | |
176 | if (ret < 0) { | |
177 | perror("fseek"); | |
178 | return ret; | |
179 | } | |
180 | pos = ftell(fp); | |
181 | if (ret < 0) { | |
182 | perror("ftell"); | |
183 | return ret; | |
184 | } | |
185 | *size = pos; | |
186 | /* add final \0 */ | |
187 | *buf = calloc(pos + 1, sizeof(char)); | |
188 | if (!*buf) { | |
189 | return -ENOMEM; | |
190 | } | |
191 | ret = fseek(fp, 0L, SEEK_SET); | |
192 | if (ret < 0) { | |
193 | perror("fseek"); | |
194 | goto error_free; | |
195 | } | |
196 | /* Copy the entire file into the buffer */ | |
197 | n = 0; | |
198 | clearerr(fp); | |
199 | while (!feof(fp) && !ferror(fp) && (*size - n > 0)) { | |
200 | len = fread(*buf, sizeof(char), *size - n, fp); | |
201 | n += len; | |
202 | } | |
203 | if (n != *size) { | |
204 | ret = -1; | |
205 | goto error_close; | |
206 | } | |
207 | ret = fclose(fp); | |
208 | if (ret < 0) { | |
209 | perror("fclose"); | |
210 | return ret; | |
211 | } | |
212 | return 0; | |
213 | ||
214 | error_close: | |
215 | ret = fclose(fp); | |
216 | if (ret < 0) { | |
217 | perror("fclose"); | |
218 | } | |
219 | error_free: | |
220 | free(*buf); | |
221 | *buf = NULL; | |
222 | return ret; | |
223 | } | |
224 | ||
225 | #endif /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ | |
226 | ||
227 | #endif /* _BABELTRACE_FORMAT_CTF_MEMSTREAM_H */ |