1 /* 2 * Copyright (c) 2014-2015, Juniper Networks, Inc. 3 * All rights reserved. 4 * This SOFTWARE is licensed under the LICENSE provided in the 5 * ../Copyright file. By downloading, installing, copying, or otherwise 6 * using the SOFTWARE, you agree to be bound by the terms of that 7 * LICENSE. 8 * Phil Shafer, July 2014 9 */ 10 11 /** 12 * libxo provides a means of generating text, XML, JSON, and HTML output 13 * using a single set of function calls, maximizing the value of output 14 * while minimizing the cost/impact on the code. 15 * 16 * Full documentation is available in ./doc/libxo.txt or online at: 17 * http://juniper.github.io/libxo/libxo-manual.html 18 */ 19 20 #ifndef INCLUDE_XO_H 21 #define INCLUDE_XO_H 22 23 #include <stdio.h> 24 #include <sys/types.h> 25 #include <stdarg.h> 26 #include <limits.h> 27 #include <stdlib.h> 28 #include <errno.h> 29 30 #ifdef __dead2 31 #define NORETURN __dead2 32 #else 33 #define NORETURN 34 #endif /* __dead2 */ 35 36 /* 37 * Normally we'd use the HAVE_PRINTFLIKE define triggered by the 38 * --enable-printflike option to configure, but we don't install 39 * our internal "xoconfig.h", and I'd rather not. Taking the 40 * coward's path, we'll turn it on inside a #if that allows 41 * others to turn it off where needed. Not ideal, but functional. 42 */ 43 #if !defined(NO_PRINTFLIKE) 44 #if defined(__linux) && !defined(__printflike) 45 #define __printflike(_x, _y) __attribute__((__format__ (__printf__, _x, _y))) 46 #endif 47 #define PRINTFLIKE(_x, _y) __printflike(_x, _y) 48 #else 49 #define PRINTFLIKE(_x, _y) 50 #endif /* NO_PRINTFLIKE */ 51 52 /** Formatting types */ 53 typedef unsigned short xo_style_t; 54 #define XO_STYLE_TEXT 0 /** Generate text output */ 55 #define XO_STYLE_XML 1 /** Generate XML output */ 56 #define XO_STYLE_JSON 2 /** Generate JSON output */ 57 #define XO_STYLE_HTML 3 /** Generate HTML output */ 58 #define XO_STYLE_SDPARAMS 4 /* Generate syslog structured data params */ 59 #define XO_STYLE_ENCODER 5 /* Generate calls to external encoder */ 60 61 /** Flags for libxo */ 62 typedef unsigned long long xo_xof_flags_t; 63 #define XOF_BIT(_n) ((xo_xof_flags_t) 1 << (_n)) 64 #define XOF_CLOSE_FP XOF_BIT(0) /** Close file pointer on xo_close() */ 65 #define XOF_PRETTY XOF_BIT(1) /** Make 'pretty printed' output */ 66 #define XOF_LOG_SYSLOG XOF_BIT(2) /** Log (on stderr) our syslog content */ 67 #define XOF_RESV3 XOF_BIT(3) /* Unused */ 68 69 #define XOF_WARN XOF_BIT(4) /** Generate warnings for broken calls */ 70 #define XOF_XPATH XOF_BIT(5) /** Emit XPath attributes in HTML */ 71 #define XOF_INFO XOF_BIT(6) /** Emit additional info fields (HTML) */ 72 #define XOF_WARN_XML XOF_BIT(7) /** Emit warnings in XML (on stdout) */ 73 74 #define XOF_NO_ENV XOF_BIT(8) /** Don't look at LIBXO_OPTIONS env var */ 75 #define XOF_NO_VA_ARG XOF_BIT(9) /** Don't advance va_list w/ va_arg() */ 76 #define XOF_DTRT XOF_BIT(10) /** Enable "do the right thing" mode */ 77 #define XOF_KEYS XOF_BIT(11) /** Flag 'key' fields for xml and json */ 78 79 #define XOF_IGNORE_CLOSE XOF_BIT(12) /** Ignore errors on close tags */ 80 #define XOF_NOT_FIRST XOF_BIT(13) /* Not the first item (JSON) */ 81 #define XOF_NO_LOCALE XOF_BIT(14) /** Don't bother with locale */ 82 #define XOF_RESV15 XOF_BIT(15) /* Unused */ 83 84 #define XOF_NO_TOP XOF_BIT(16) /** Don't emit the top braces in JSON */ 85 #define XOF_RESV17 XOF_BIT(17) /* Unused */ 86 #define XOF_UNITS XOF_BIT(18) /** Encode units in XML */ 87 #define XOF_RESV19 XOF_BIT(19) /* Unused */ 88 89 #define XOF_UNDERSCORES XOF_BIT(20) /** Replace dashes with underscores (JSON)*/ 90 #define XOF_COLUMNS XOF_BIT(21) /** xo_emit should return a column count */ 91 #define XOF_FLUSH XOF_BIT(22) /** Flush after each xo_emit call */ 92 #define XOF_FLUSH_LINE XOF_BIT(23) /** Flush after each newline */ 93 94 #define XOF_NO_CLOSE XOF_BIT(24) /** xo_finish won't close open elements */ 95 #define XOF_COLOR_ALLOWED XOF_BIT(25) /** Allow color/effects to be enabled */ 96 #define XOF_COLOR XOF_BIT(26) /** Enable color and effects */ 97 #define XOF_NO_HUMANIZE XOF_BIT(27) /** Block the {h:} modifier */ 98 99 #define XOF_LOG_GETTEXT XOF_BIT(28) /** Log (stderr) gettext lookup strings */ 100 #define XOF_UTF8 XOF_BIT(29) /** Force text output to be UTF8 */ 101 #define XOF_RETAIN_ALL XOF_BIT(30) /** Force use of XOEF_RETAIN */ 102 #define XOF_RETAIN_NONE XOF_BIT(31) /** Prevent use of XOEF_RETAIN */ 103 104 #define XOF_COLOR_MAP XOF_BIT(32) /** Color map has been initialized */ 105 106 typedef unsigned xo_emit_flags_t; /* Flags to xo_emit() and friends */ 107 #define XOEF_RETAIN (1<<0) /* Retain parsed formatting information */ 108 109 /* 110 * The xo_info_t structure provides a mapping between names and 111 * additional data emitted via HTML. 112 */ 113 typedef struct xo_info_s { 114 const char *xi_name; /* Name of the element */ 115 const char *xi_type; /* Type of field */ 116 const char *xi_help; /* Description of field */ 117 } xo_info_t; 118 119 #define XO_INFO_NULL NULL, NULL, NULL /* Use '{ XO_INFO_NULL }' to end lists */ 120 121 struct xo_handle_s; /* Opaque structure forward */ 122 typedef struct xo_handle_s xo_handle_t; /* Handle for XO output */ 123 124 /* 125 * Early versions of the API used "int" instead of "size_t" for buffer 126 * sizes. We want to fix this but allow for backwards compatibility 127 * where needed. 128 */ 129 #ifdef USE_INT_RETURN_CODES 130 typedef int xo_ssize_t; /* Buffer size */ 131 #else /* USE_INT_RETURN_CODES */ 132 typedef ssize_t xo_ssize_t; /* Buffer size */ 133 #endif /* USE_INT_RETURN_CODES */ 134 135 typedef xo_ssize_t (*xo_write_func_t)(void *, const char *); 136 typedef void (*xo_close_func_t)(void *); 137 typedef int (*xo_flush_func_t)(void *); 138 typedef void *(*xo_realloc_func_t)(void *, size_t); 139 typedef void (*xo_free_func_t)(void *); 140 141 /* 142 * The formatter function mirrors "vsnprintf", with an additional argument 143 * of the xo handle. The caller should return the number of bytes _needed_ 144 * to fit the data, even if this exceeds 'len'. 145 */ 146 typedef xo_ssize_t (*xo_formatter_t)(xo_handle_t *, char *, xo_ssize_t, 147 const char *, va_list); 148 typedef void (*xo_checkpointer_t)(xo_handle_t *, va_list, int); 149 150 xo_handle_t * 151 xo_create (xo_style_t style, xo_xof_flags_t flags); 152 153 xo_handle_t * 154 xo_create_to_file (FILE *fp, xo_style_t style, xo_xof_flags_t flags); 155 156 void 157 xo_destroy (xo_handle_t *xop); 158 159 void 160 xo_set_writer (xo_handle_t *xop, void *opaque, xo_write_func_t write_func, 161 xo_close_func_t close_func, xo_flush_func_t flush_func); 162 163 void 164 xo_set_allocator (xo_realloc_func_t realloc_func, xo_free_func_t free_func); 165 166 void 167 xo_set_style (xo_handle_t *xop, xo_style_t style); 168 169 xo_style_t 170 xo_get_style (xo_handle_t *xop); 171 172 int 173 xo_set_style_name (xo_handle_t *xop, const char *style); 174 175 int 176 xo_set_options (xo_handle_t *xop, const char *input); 177 178 xo_xof_flags_t 179 xo_get_flags (xo_handle_t *xop); 180 181 void 182 xo_set_flags (xo_handle_t *xop, xo_xof_flags_t flags); 183 184 void 185 xo_clear_flags (xo_handle_t *xop, xo_xof_flags_t flags); 186 187 int 188 xo_set_file_h (xo_handle_t *xop, FILE *fp); 189 190 int 191 xo_set_file (FILE *fp); 192 193 void 194 xo_set_info (xo_handle_t *xop, xo_info_t *infop, int count); 195 196 void 197 xo_set_formatter (xo_handle_t *xop, xo_formatter_t func, xo_checkpointer_t); 198 199 void 200 xo_set_depth (xo_handle_t *xop, int depth); 201 202 xo_ssize_t 203 xo_emit_hv (xo_handle_t *xop, const char *fmt, va_list vap); 204 205 xo_ssize_t 206 xo_emit_h (xo_handle_t *xop, const char *fmt, ...); 207 208 xo_ssize_t 209 xo_emit (const char *fmt, ...); 210 211 xo_ssize_t 212 xo_emit_hvf (xo_handle_t *xop, xo_emit_flags_t flags, 213 const char *fmt, va_list vap); 214 215 xo_ssize_t 216 xo_emit_hf (xo_handle_t *xop, xo_emit_flags_t flags, const char *fmt, ...); 217 218 xo_ssize_t 219 xo_emit_f (xo_emit_flags_t flags, const char *fmt, ...); 220 221 PRINTFLIKE(2, 0) 222 static inline int 223 xo_emit_hvp (xo_handle_t *xop, const char *fmt, va_list vap) 224 { 225 return xo_emit_hv(xop, fmt, vap); 226 } 227 228 PRINTFLIKE(2, 3) 229 static inline int 230 xo_emit_hp (xo_handle_t *xop, const char *fmt, ...) 231 { 232 va_list vap; 233 va_start(vap, fmt); 234 int rc = xo_emit_hv(xop, fmt, vap); 235 va_end(vap); 236 return rc; 237 } 238 239 PRINTFLIKE(1, 2) 240 static inline int 241 xo_emit_p (const char *fmt, ...) 242 { 243 va_list vap; 244 va_start(vap, fmt); 245 int rc = xo_emit_hv(NULL, fmt, vap); 246 va_end(vap); 247 return rc; 248 } 249 250 PRINTFLIKE(3, 0) 251 static inline int 252 xo_emit_hvfp (xo_handle_t *xop, xo_emit_flags_t flags, 253 const char *fmt, va_list vap) 254 { 255 return xo_emit_hvf(xop, flags, fmt, vap); 256 } 257 258 PRINTFLIKE(3, 4) 259 static inline int 260 xo_emit_hfp (xo_handle_t *xop, xo_emit_flags_t flags, const char *fmt, ...) 261 { 262 va_list vap; 263 va_start(vap, fmt); 264 int rc = xo_emit_hvf(xop, flags, fmt, vap); 265 va_end(vap); 266 return rc; 267 } 268 269 PRINTFLIKE(2, 3) 270 static inline int 271 xo_emit_fp (xo_emit_flags_t flags, const char *fmt, ...) 272 { 273 va_list vap; 274 va_start(vap, fmt); 275 int rc = xo_emit_hvf(NULL, flags, fmt, vap); 276 va_end(vap); 277 return rc; 278 } 279 280 xo_ssize_t 281 xo_open_container_h (xo_handle_t *xop, const char *name); 282 283 xo_ssize_t 284 xo_open_container (const char *name); 285 286 xo_ssize_t 287 xo_open_container_hd (xo_handle_t *xop, const char *name); 288 289 xo_ssize_t 290 xo_open_container_d (const char *name); 291 292 xo_ssize_t 293 xo_close_container_h (xo_handle_t *xop, const char *name); 294 295 xo_ssize_t 296 xo_close_container (const char *name); 297 298 xo_ssize_t 299 xo_close_container_hd (xo_handle_t *xop); 300 301 xo_ssize_t 302 xo_close_container_d (void); 303 304 xo_ssize_t 305 xo_open_list_h (xo_handle_t *xop, const char *name); 306 307 xo_ssize_t 308 xo_open_list (const char *name); 309 310 xo_ssize_t 311 xo_open_list_hd (xo_handle_t *xop, const char *name); 312 313 xo_ssize_t 314 xo_open_list_d (const char *name); 315 316 xo_ssize_t 317 xo_close_list_h (xo_handle_t *xop, const char *name); 318 319 xo_ssize_t 320 xo_close_list (const char *name); 321 322 xo_ssize_t 323 xo_close_list_hd (xo_handle_t *xop); 324 325 xo_ssize_t 326 xo_close_list_d (void); 327 328 xo_ssize_t 329 xo_open_instance_h (xo_handle_t *xop, const char *name); 330 331 xo_ssize_t 332 xo_open_instance (const char *name); 333 334 xo_ssize_t 335 xo_open_instance_hd (xo_handle_t *xop, const char *name); 336 337 xo_ssize_t 338 xo_open_instance_d (const char *name); 339 340 xo_ssize_t 341 xo_close_instance_h (xo_handle_t *xop, const char *name); 342 343 xo_ssize_t 344 xo_close_instance (const char *name); 345 346 xo_ssize_t 347 xo_close_instance_hd (xo_handle_t *xop); 348 349 xo_ssize_t 350 xo_close_instance_d (void); 351 352 xo_ssize_t 353 xo_open_marker_h (xo_handle_t *xop, const char *name); 354 355 xo_ssize_t 356 xo_open_marker (const char *name); 357 358 xo_ssize_t 359 xo_close_marker_h (xo_handle_t *xop, const char *name); 360 361 xo_ssize_t 362 xo_close_marker (const char *name); 363 364 xo_ssize_t 365 xo_attr_h (xo_handle_t *xop, const char *name, const char *fmt, ...); 366 367 xo_ssize_t 368 xo_attr_hv (xo_handle_t *xop, const char *name, const char *fmt, va_list vap); 369 370 xo_ssize_t 371 xo_attr (const char *name, const char *fmt, ...); 372 373 void 374 xo_error_hv (xo_handle_t *xop, const char *fmt, va_list vap); 375 376 void 377 xo_error_h (xo_handle_t *xop, const char *fmt, ...); 378 379 void 380 xo_error (const char *fmt, ...); 381 382 xo_ssize_t 383 xo_flush_h (xo_handle_t *xop); 384 385 xo_ssize_t 386 xo_flush (void); 387 388 xo_ssize_t 389 xo_finish_h (xo_handle_t *xop); 390 391 xo_ssize_t 392 xo_finish (void); 393 394 void 395 xo_finish_atexit (void); 396 397 void 398 xo_set_leading_xpath (xo_handle_t *xop, const char *path); 399 400 void 401 xo_warn_hc (xo_handle_t *xop, int code, const char *fmt, ...) PRINTFLIKE(3, 4); 402 403 void 404 xo_warn_c (int code, const char *fmt, ...) PRINTFLIKE(2, 3); 405 406 void 407 xo_warn (const char *fmt, ...) PRINTFLIKE(1, 2); 408 409 void 410 xo_warnx (const char *fmt, ...) PRINTFLIKE(1, 2); 411 412 void 413 xo_err (int eval, const char *fmt, ...) NORETURN PRINTFLIKE(2, 3); 414 415 void 416 xo_errx (int eval, const char *fmt, ...) NORETURN PRINTFLIKE(2, 3); 417 418 void 419 xo_errc (int eval, int code, const char *fmt, ...) NORETURN PRINTFLIKE(3, 4); 420 421 void 422 xo_message_hcv (xo_handle_t *xop, int code, const char *fmt, va_list vap) PRINTFLIKE(3, 0); 423 424 void 425 xo_message_hc (xo_handle_t *xop, int code, const char *fmt, ...) PRINTFLIKE(3, 4); 426 427 void 428 xo_message_c (int code, const char *fmt, ...) PRINTFLIKE(2, 3); 429 430 void 431 xo_message_e (const char *fmt, ...) PRINTFLIKE(1, 2); 432 433 void 434 xo_message (const char *fmt, ...) PRINTFLIKE(1, 2); 435 436 void 437 xo_emit_warn_hcv (xo_handle_t *xop, int as_warning, int code, 438 const char *fmt, va_list vap); 439 440 void 441 xo_emit_warn_hc (xo_handle_t *xop, int code, const char *fmt, ...); 442 443 void 444 xo_emit_warn_c (int code, const char *fmt, ...); 445 446 void 447 xo_emit_warn (const char *fmt, ...); 448 449 void 450 xo_emit_warnx (const char *fmt, ...); 451 452 void 453 xo_emit_err (int eval, const char *fmt, ...) NORETURN; 454 455 void 456 xo_emit_errx (int eval, const char *fmt, ...) NORETURN; 457 458 void 459 xo_emit_errc (int eval, int code, const char *fmt, ...) NORETURN; 460 461 PRINTFLIKE(4, 0) 462 static inline void 463 xo_emit_warn_hcvp (xo_handle_t *xop, int as_warning, int code, 464 const char *fmt, va_list vap) 465 { 466 xo_emit_warn_hcv(xop, as_warning, code, fmt, vap); 467 } 468 469 PRINTFLIKE(3, 4) 470 static inline void 471 xo_emit_warn_hcp (xo_handle_t *xop, int code, const char *fmt, ...) 472 { 473 va_list vap; 474 va_start(vap, fmt); 475 xo_emit_warn_hcv(xop, 1, code, fmt, vap); 476 va_end(vap); 477 } 478 479 PRINTFLIKE(2, 3) 480 static inline void 481 xo_emit_warn_cp (int code, const char *fmt, ...) 482 { 483 va_list vap; 484 va_start(vap, fmt); 485 xo_emit_warn_hcv(NULL, 1, code, fmt, vap); 486 va_end(vap); 487 } 488 489 PRINTFLIKE(1, 2) 490 static inline void 491 xo_emit_warn_p (const char *fmt, ...) 492 { 493 int code = errno; 494 va_list vap; 495 va_start(vap, fmt); 496 xo_emit_warn_hcv(NULL, 1, code, fmt, vap); 497 va_end(vap); 498 } 499 500 PRINTFLIKE(1, 2) 501 static inline void 502 xo_emit_warnx_p (const char *fmt, ...) 503 { 504 va_list vap; 505 va_start(vap, fmt); 506 xo_emit_warn_hcv(NULL, 1, -1, fmt, vap); 507 va_end(vap); 508 } 509 510 NORETURN PRINTFLIKE(2, 3) 511 static inline void 512 xo_emit_err_p (int eval, const char *fmt, ...) 513 { 514 int code = errno; 515 va_list vap; 516 va_start(vap, fmt); 517 xo_emit_warn_hcv(NULL, 0, code, fmt, vap); 518 va_end(vap); 519 520 exit(eval); 521 } 522 523 PRINTFLIKE(2, 3) 524 static inline void 525 xo_emit_errx_p (int eval, const char *fmt, ...) 526 { 527 va_list vap; 528 va_start(vap, fmt); 529 xo_emit_warn_hcv(NULL, 0, -1, fmt, vap); 530 va_end(vap); 531 exit(eval); 532 } 533 534 PRINTFLIKE(3, 4) 535 static inline void 536 xo_emit_errc_p (int eval, int code, const char *fmt, ...) 537 { 538 va_list vap; 539 va_start(vap, fmt); 540 xo_emit_warn_hcv(NULL, 0, code, fmt, vap); 541 va_end(vap); 542 exit(eval); 543 } 544 545 void 546 xo_emit_err_v (int eval, int code, const char *fmt, va_list vap) NORETURN PRINTFLIKE(3, 0); 547 548 void 549 xo_no_setlocale (void); 550 551 /** 552 * @brief Lift libxo-specific arguments from a set of arguments 553 * 554 * libxo-enable programs typically use command line options to enable 555 * all the nifty-cool libxo features. xo_parse_args() makes this simple 556 * by pre-processing the command line arguments given to main(), handling 557 * and removing the libxo-specific ones, meaning anything starting with 558 * "--libxo". A full description of these arguments is in the base 559 * documentation. 560 * @param[in] argc Number of arguments (ala #main()) 561 * @param[in] argc Array of argument strings (ala #main()) 562 * @return New number of arguments, or -1 for failure. 563 */ 564 int 565 xo_parse_args (int argc, char **argv); 566 567 /** 568 * This is the "magic" number returned by libxo-supporting commands 569 * when passed the equally magic "--libxo-check" option. If you 570 * return this, we can (unsafely) assume that since you know the magic 571 * handshake, you'll happily handle future --libxo options and not do 572 * something violent like reboot the box or create another hole in the 573 * ozone layer. 574 */ 575 #define XO_HAS_LIBXO 121 576 577 /** 578 * externs for libxo's version number strings 579 */ 580 extern const char xo_version[]; /** Base version triple string */ 581 extern const char xo_version_extra[]; /** Extra version magic content */ 582 583 /** 584 * @brief Dump the internal stack of a libxo handle. 585 * 586 * This diagnostic function is something I will ask you to call from 587 * your program when you write to tell me libxo has gone bat-stink 588 * crazy and has discarded your list or container or content. Output 589 * content will be what we lovingly call "developer entertainment". 590 * @param[in] xop A valid libxo handle, or NULL for the default handle 591 */ 592 void 593 xo_dump_stack (xo_handle_t *xop); 594 595 /** 596 * @brief Recode the name of the program, suitable for error output. 597 * 598 * libxo will record the given name for use while generating error 599 * messages. The contents are not copied, so the value must continue 600 * to point to a valid memory location. This allows the caller to change 601 * the value, but requires the caller to manage the memory. Typically 602 * this is called with argv[0] from main(). 603 * @param[in] name The name of the current application program 604 */ 605 void 606 xo_set_program (const char *name); 607 608 /** 609 * @brief Add a version string to the output, where possible. 610 * 611 * Adds a version number to the output, suitable for tracking 612 * changes in the content. This is only important for the "encoding" 613 * format styles (XML and JSON) and allows a user of the data to 614 * discern which version of the data model is in use. 615 * @param[in] version The version number, encoded as a string 616 */ 617 void 618 xo_set_version (const char *version); 619 620 /** 621 * #xo_set_version with a handle. 622 * @param[in] xop A valid libxo handle, or NULL for the default handle 623 * @param[in] version The version number, encoded as a string 624 */ 625 void 626 xo_set_version_h (xo_handle_t *xop, const char *version); 627 628 void 629 xo_open_log (const char *ident, int logopt, int facility); 630 631 void 632 xo_close_log (void); 633 634 int 635 xo_set_logmask (int maskpri); 636 637 void 638 xo_set_unit_test_mode (int value); 639 640 void 641 xo_syslog (int priority, const char *name, const char *message, ...); 642 643 void 644 xo_vsyslog (int priority, const char *name, const char *message, va_list args); 645 646 typedef void (*xo_syslog_open_t)(void); 647 typedef void (*xo_syslog_send_t)(const char *full_msg, 648 const char *v0_hdr, const char *text_only); 649 typedef void (*xo_syslog_close_t)(void); 650 651 void 652 xo_set_syslog_handler (xo_syslog_open_t open_func, xo_syslog_send_t send_func, 653 xo_syslog_close_t close_func); 654 655 void 656 xo_set_syslog_enterprise_id (unsigned short eid); 657 658 typedef void (*xo_simplify_field_func_t)(const char *, unsigned, int); 659 660 char * 661 xo_simplify_format (xo_handle_t *xop, const char *fmt, int with_numbers, 662 xo_simplify_field_func_t field_cb); 663 664 xo_ssize_t 665 xo_emit_field_hv (xo_handle_t *xop, const char *rolmod, const char *contents, 666 const char *fmt, const char *efmt, 667 va_list vap); 668 669 xo_ssize_t 670 xo_emit_field_h (xo_handle_t *xop, const char *rolmod, const char *contents, 671 const char *fmt, const char *efmt, ...); 672 673 xo_ssize_t 674 xo_emit_field (const char *rolmod, const char *contents, 675 const char *fmt, const char *efmt, ...); 676 677 void 678 xo_retain_clear_all (void); 679 680 void 681 xo_retain_clear (const char *fmt); 682 683 #endif /* INCLUDE_XO_H */ 684