| 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 | |
| 22 | #define _GNU_SOURCE |
| 23 | #include <config.h> |
| 24 | |
| 25 | #ifdef BABELTRACE_HAVE_FMEMOPEN |
| 26 | #include <stdio.h> |
| 27 | |
| 28 | static inline |
| 29 | FILE *babeltrace_fmemopen(void *buf, size_t size, const char *mode) |
| 30 | { |
| 31 | return fmemopen(buf, size, mode); |
| 32 | } |
| 33 | |
| 34 | #else /* BABELTRACE_HAVE_FMEMOPEN */ |
| 35 | |
| 36 | #include <stdlib.h> |
| 37 | #include <stdio.h> |
| 38 | |
| 39 | /* |
| 40 | * Fallback for systems which don't have fmemopen. Copy buffer to a |
| 41 | * temporary file, and use that file as FILE * input. |
| 42 | */ |
| 43 | static inline |
| 44 | FILE *babeltrace_fmemopen(void *buf, size_t size, const char *mode) |
| 45 | { |
| 46 | char tmpname[PATH_MAX]; |
| 47 | size_t len; |
| 48 | FILE *fp; |
| 49 | int ret; |
| 50 | |
| 51 | /* |
| 52 | * Support reading only. |
| 53 | */ |
| 54 | if (strcmp(mode, "rb") != 0) { |
| 55 | return NULL; |
| 56 | } |
| 57 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); |
| 58 | ret = mkstemp(tmpname); |
| 59 | if (ret < 0) { |
| 60 | return NULL; |
| 61 | } |
| 62 | /* |
| 63 | * We need to write to the file. |
| 64 | */ |
| 65 | fp = fdopen(ret, "w+"); |
| 66 | if (!fp) { |
| 67 | goto error_unlink; |
| 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 | ret = fseek(fp, 0L, SEEK_SET); |
| 75 | if (ret < 0) { |
| 76 | perror("fseek"); |
| 77 | goto error_close; |
| 78 | } |
| 79 | /* We keep the handle open, but can unlink the file on the VFS. */ |
| 80 | ret = unlink(tmpname); |
| 81 | if (ret < 0) { |
| 82 | perror("unlink"); |
| 83 | } |
| 84 | return fp; |
| 85 | |
| 86 | error_close: |
| 87 | ret = fclose(fp); |
| 88 | if (ret < 0) { |
| 89 | perror("close"); |
| 90 | } |
| 91 | error_unlink: |
| 92 | ret = unlink(tmpname); |
| 93 | if (ret < 0) { |
| 94 | perror("unlink"); |
| 95 | } |
| 96 | return NULL; |
| 97 | } |
| 98 | |
| 99 | #endif /* BABELTRACE_HAVE_FMEMOPEN */ |
| 100 | |
| 101 | #ifdef BABELTRACE_HAVE_OPEN_MEMSTREAM |
| 102 | |
| 103 | #include <stdio.h> |
| 104 | |
| 105 | static inline |
| 106 | FILE *babeltrace_open_memstream(char **ptr, size_t *sizeloc) |
| 107 | { |
| 108 | return open_memstream(ptr, sizeloc); |
| 109 | } |
| 110 | |
| 111 | static inline |
| 112 | int babeltrace_close_memstream(char **buf, size_t *size, FILE *fp) |
| 113 | { |
| 114 | return fclose(fp); |
| 115 | } |
| 116 | |
| 117 | #else /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ |
| 118 | |
| 119 | #include <stdlib.h> |
| 120 | #include <stdio.h> |
| 121 | |
| 122 | /* |
| 123 | * Fallback for systems which don't have open_memstream. Create FILE * |
| 124 | * with babeltrace_open_memstream, but require call to |
| 125 | * babeltrace_close_memstream to flush all data written to the FILE * |
| 126 | * into the buffer (which we allocate). |
| 127 | */ |
| 128 | static inline |
| 129 | FILE *babeltrace_open_memstream(char **ptr, size_t *sizeloc) |
| 130 | { |
| 131 | char tmpname[PATH_MAX]; |
| 132 | int ret; |
| 133 | FILE *fp; |
| 134 | |
| 135 | strncpy(tmpname, "/tmp/babeltrace-tmp-XXXXXX", PATH_MAX); |
| 136 | ret = mkstemp(tmpname); |
| 137 | if (ret < 0) { |
| 138 | return NULL; |
| 139 | } |
| 140 | fp = fdopen(ret, "w+"); |
| 141 | if (!fp) { |
| 142 | goto error_unlink; |
| 143 | } |
| 144 | /* |
| 145 | * babeltrace_flush_memstream will update the buffer content |
| 146 | * with read from fp. No need to keep the file around, just the |
| 147 | * handle. |
| 148 | */ |
| 149 | ret = unlink(tmpname); |
| 150 | if (ret < 0) { |
| 151 | perror("unlink"); |
| 152 | } |
| 153 | return fp; |
| 154 | |
| 155 | error_unlink: |
| 156 | ret = unlink(tmpname); |
| 157 | if (ret < 0) { |
| 158 | perror("unlink"); |
| 159 | } |
| 160 | return NULL; |
| 161 | } |
| 162 | |
| 163 | /* Get file size, allocate buffer, copy. */ |
| 164 | static inline |
| 165 | int babeltrace_close_memstream(char **buf, size_t *size, FILE *fp) |
| 166 | { |
| 167 | size_t len, n; |
| 168 | long pos; |
| 169 | int ret; |
| 170 | |
| 171 | ret = fflush(fp); |
| 172 | if (ret < 0) { |
| 173 | perror("fflush"); |
| 174 | return ret; |
| 175 | } |
| 176 | ret = fseek(fp, 0L, SEEK_END); |
| 177 | if (ret < 0) { |
| 178 | perror("fseek"); |
| 179 | return ret; |
| 180 | } |
| 181 | pos = ftell(fp); |
| 182 | if (ret < 0) { |
| 183 | perror("ftell"); |
| 184 | return ret; |
| 185 | } |
| 186 | *size = pos; |
| 187 | /* add final \0 */ |
| 188 | *buf = calloc(pos + 1, sizeof(char)); |
| 189 | if (!*buf) { |
| 190 | return -ENOMEM; |
| 191 | } |
| 192 | ret = fseek(fp, 0L, SEEK_SET); |
| 193 | if (ret < 0) { |
| 194 | perror("fseek"); |
| 195 | goto error_free; |
| 196 | } |
| 197 | /* Copy the entire file into the buffer */ |
| 198 | n = 0; |
| 199 | clearerr(fp); |
| 200 | while (!feof(fp) && !ferror(fp) && (*size - n > 0)) { |
| 201 | len = fread(*buf, sizeof(char), *size - n, fp); |
| 202 | n += len; |
| 203 | } |
| 204 | if (n != *size) { |
| 205 | ret = -1; |
| 206 | goto error_close; |
| 207 | } |
| 208 | ret = fclose(fp); |
| 209 | if (ret < 0) { |
| 210 | perror("fclose"); |
| 211 | return ret; |
| 212 | } |
| 213 | return 0; |
| 214 | |
| 215 | error_close: |
| 216 | ret = fclose(fp); |
| 217 | if (ret < 0) { |
| 218 | perror("fclose"); |
| 219 | } |
| 220 | error_free: |
| 221 | free(*buf); |
| 222 | *buf = NULL; |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | #endif /* BABELTRACE_HAVE_OPEN_MEMSTREAM */ |
| 227 | |
| 228 | #endif /* _BABELTRACE_FORMAT_CTF_MEMSTREAM_H */ |