667 lines
17 KiB
C
667 lines
17 KiB
C
/*
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* Copyright (c) 2014-2015, Juniper Networks, Inc.
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* All rights reserved.
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* This SOFTWARE is licensed under the LICENSE provided in the
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* ../Copyright file. By downloading, installing, copying, or otherwise
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* using the SOFTWARE, you agree to be bound by the terms of that
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* LICENSE.
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* Phil Shafer, July 2014
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*/
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/**
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* libxo provides a means of generating text, XML, JSON, and HTML output
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* using a single set of function calls, maximizing the value of output
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* while minimizing the cost/impact on the code.
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*
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* Full documentation is available in ./doc/libxo.txt or online at:
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* http://juniper.github.io/libxo/libxo-manual.html
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*/
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#ifndef INCLUDE_XO_H
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#define INCLUDE_XO_H
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#include <stdio.h>
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#include <sys/types.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifdef __dead2
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#define NORETURN __dead2
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#else
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#define NORETURN
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#endif /* __dead2 */
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/*
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* Normally we'd use the HAVE_PRINTFLIKE define triggered by the
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* --enable-printflike option to configure, but we don't install
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* our internal "xoconfig.h", and I'd rather not. Taking the
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* coward's path, we'll turn it on inside a #if that allows
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* others to turn it off where needed. Not ideal, but functional.
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*/
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#if !defined(NO_PRINTFLIKE) && !defined(__linux__)
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#define PRINTFLIKE(_x, _y) __printflike(_x, _y)
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#else
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#define PRINTFLIKE(_x, _y)
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#endif /* NO_PRINTFLIKE */
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/** Formatting types */
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typedef unsigned short xo_style_t;
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#define XO_STYLE_TEXT 0 /** Generate text output */
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#define XO_STYLE_XML 1 /** Generate XML output */
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#define XO_STYLE_JSON 2 /** Generate JSON output */
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#define XO_STYLE_HTML 3 /** Generate HTML output */
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#define XO_STYLE_SDPARAMS 4 /* Generate syslog structured data params */
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#define XO_STYLE_ENCODER 5 /* Generate calls to external encoder */
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/** Flags for libxo */
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typedef unsigned long long xo_xof_flags_t;
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#define XOF_BIT(_n) ((xo_xof_flags_t) 1 << (_n))
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#define XOF_CLOSE_FP XOF_BIT(0) /** Close file pointer on xo_close() */
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#define XOF_PRETTY XOF_BIT(1) /** Make 'pretty printed' output */
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#define XOF_LOG_SYSLOG XOF_BIT(2) /** Log (on stderr) our syslog content */
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#define XOF_RESV3 XOF_BIT(3) /* Unused */
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#define XOF_WARN XOF_BIT(4) /** Generate warnings for broken calls */
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#define XOF_XPATH XOF_BIT(5) /** Emit XPath attributes in HTML */
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#define XOF_INFO XOF_BIT(6) /** Emit additional info fields (HTML) */
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#define XOF_WARN_XML XOF_BIT(7) /** Emit warnings in XML (on stdout) */
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#define XOF_NO_ENV XOF_BIT(8) /** Don't look at LIBXO_OPTIONS env var */
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#define XOF_NO_VA_ARG XOF_BIT(9) /** Don't advance va_list w/ va_arg() */
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#define XOF_DTRT XOF_BIT(10) /** Enable "do the right thing" mode */
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#define XOF_KEYS XOF_BIT(11) /** Flag 'key' fields for xml and json */
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#define XOF_IGNORE_CLOSE XOF_BIT(12) /** Ignore errors on close tags */
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#define XOF_NOT_FIRST XOF_BIT(13) /* Not the first item (JSON) */
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#define XOF_NO_LOCALE XOF_BIT(14) /** Don't bother with locale */
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#define XOF_RESV15 XOF_BIT(15) /* Unused */
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#define XOF_NO_TOP XOF_BIT(16) /** Don't emit the top braces in JSON */
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#define XOF_RESV17 XOF_BIT(17) /* Unused */
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#define XOF_UNITS XOF_BIT(18) /** Encode units in XML */
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#define XOF_RESV19 XOF_BIT(19) /* Unused */
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#define XOF_UNDERSCORES XOF_BIT(20) /** Replace dashes with underscores (JSON)*/
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#define XOF_COLUMNS XOF_BIT(21) /** xo_emit should return a column count */
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#define XOF_FLUSH XOF_BIT(22) /** Flush after each xo_emit call */
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#define XOF_FLUSH_LINE XOF_BIT(23) /** Flush after each newline */
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#define XOF_NO_CLOSE XOF_BIT(24) /** xo_finish won't close open elements */
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#define XOF_COLOR_ALLOWED XOF_BIT(25) /** Allow color/effects to be enabled */
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#define XOF_COLOR XOF_BIT(26) /** Enable color and effects */
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#define XOF_NO_HUMANIZE XOF_BIT(27) /** Block the {h:} modifier */
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#define XOF_LOG_GETTEXT XOF_BIT(28) /** Log (stderr) gettext lookup strings */
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#define XOF_UTF8 XOF_BIT(29) /** Force text output to be UTF8 */
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#define XOF_RETAIN_ALL XOF_BIT(30) /** Force use of XOEF_RETAIN */
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#define XOF_RETAIN_NONE XOF_BIT(31) /** Prevent use of XOEF_RETAIN */
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typedef unsigned xo_emit_flags_t; /* Flags to xo_emit() and friends */
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#define XOEF_RETAIN (1<<0) /* Retain parsed formatting information */
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/*
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* The xo_info_t structure provides a mapping between names and
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* additional data emitted via HTML.
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*/
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typedef struct xo_info_s {
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const char *xi_name; /* Name of the element */
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const char *xi_type; /* Type of field */
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const char *xi_help; /* Description of field */
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} xo_info_t;
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#define XO_INFO_NULL NULL, NULL, NULL /* Use '{ XO_INFO_NULL }' to end lists */
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struct xo_handle_s; /* Opaque structure forward */
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typedef struct xo_handle_s xo_handle_t; /* Handle for XO output */
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typedef int (*xo_write_func_t)(void *, const char *);
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typedef void (*xo_close_func_t)(void *);
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typedef int (*xo_flush_func_t)(void *);
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typedef void *(*xo_realloc_func_t)(void *, size_t);
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typedef void (*xo_free_func_t)(void *);
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/*
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* The formatter function mirrors "vsnprintf", with an additional argument
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* of the xo handle. The caller should return the number of bytes _needed_
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* to fit the data, even if this exceeds 'len'.
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*/
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typedef int (*xo_formatter_t)(xo_handle_t *, char *, int,
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const char *, va_list);
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typedef void (*xo_checkpointer_t)(xo_handle_t *, va_list, int);
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xo_handle_t *
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xo_create (xo_style_t style, xo_xof_flags_t flags);
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xo_handle_t *
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xo_create_to_file (FILE *fp, xo_style_t style, xo_xof_flags_t flags);
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void
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xo_destroy (xo_handle_t *xop);
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void
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xo_set_writer (xo_handle_t *xop, void *opaque, xo_write_func_t write_func,
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xo_close_func_t close_func, xo_flush_func_t flush_func);
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void
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xo_set_allocator (xo_realloc_func_t realloc_func, xo_free_func_t free_func);
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void
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xo_set_style (xo_handle_t *xop, xo_style_t style);
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xo_style_t
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xo_get_style (xo_handle_t *xop);
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int
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xo_set_style_name (xo_handle_t *xop, const char *style);
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int
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xo_set_options (xo_handle_t *xop, const char *input);
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xo_xof_flags_t
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xo_get_flags (xo_handle_t *xop);
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void
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xo_set_flags (xo_handle_t *xop, xo_xof_flags_t flags);
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void
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xo_clear_flags (xo_handle_t *xop, xo_xof_flags_t flags);
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int
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xo_set_file_h (xo_handle_t *xop, FILE *fp);
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int
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xo_set_file (FILE *fp);
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void
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xo_set_info (xo_handle_t *xop, xo_info_t *infop, int count);
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void
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xo_set_formatter (xo_handle_t *xop, xo_formatter_t func, xo_checkpointer_t);
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void
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xo_set_depth (xo_handle_t *xop, int depth);
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int
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xo_emit_hv (xo_handle_t *xop, const char *fmt, va_list vap);
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int
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xo_emit_h (xo_handle_t *xop, const char *fmt, ...);
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int
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xo_emit (const char *fmt, ...);
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int
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xo_emit_hvf (xo_handle_t *xop, xo_emit_flags_t flags,
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const char *fmt, va_list vap);
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int
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xo_emit_hf (xo_handle_t *xop, xo_emit_flags_t flags, const char *fmt, ...);
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int
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xo_emit_f (xo_emit_flags_t flags, const char *fmt, ...);
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PRINTFLIKE(2, 0)
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static inline int
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xo_emit_hvp (xo_handle_t *xop, const char *fmt, va_list vap)
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{
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return xo_emit_hv(xop, fmt, vap);
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}
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PRINTFLIKE(2, 3)
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static inline int
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xo_emit_hp (xo_handle_t *xop, const char *fmt, ...)
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{
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va_list vap;
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va_start(vap, fmt);
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int rc = xo_emit_hv(xop, fmt, vap);
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va_end(vap);
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return rc;
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}
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PRINTFLIKE(1, 2)
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static inline int
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xo_emit_p (const char *fmt, ...)
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{
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va_list vap;
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va_start(vap, fmt);
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int rc = xo_emit_hv(NULL, fmt, vap);
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va_end(vap);
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return rc;
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}
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PRINTFLIKE(3, 0)
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static inline int
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xo_emit_hvfp (xo_handle_t *xop, xo_emit_flags_t flags,
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const char *fmt, va_list vap)
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{
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return xo_emit_hvf(xop, flags, fmt, vap);
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}
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PRINTFLIKE(3, 4)
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static inline int
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xo_emit_hfp (xo_handle_t *xop, xo_emit_flags_t flags, const char *fmt, ...)
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{
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va_list vap;
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va_start(vap, fmt);
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int rc = xo_emit_hvf(xop, flags, fmt, vap);
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va_end(vap);
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return rc;
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}
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PRINTFLIKE(2, 3)
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static inline int
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xo_emit_fp (xo_emit_flags_t flags, const char *fmt, ...)
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{
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va_list vap;
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va_start(vap, fmt);
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int rc = xo_emit_hvf(NULL, flags, fmt, vap);
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va_end(vap);
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return rc;
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}
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int
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xo_open_container_h (xo_handle_t *xop, const char *name);
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int
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xo_open_container (const char *name);
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int
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xo_open_container_hd (xo_handle_t *xop, const char *name);
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int
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xo_open_container_d (const char *name);
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int
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xo_close_container_h (xo_handle_t *xop, const char *name);
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int
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xo_close_container (const char *name);
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int
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xo_close_container_hd (xo_handle_t *xop);
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int
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xo_close_container_d (void);
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int
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xo_open_list_h (xo_handle_t *xop, const char *name);
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int
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xo_open_list (const char *name);
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int
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xo_open_list_hd (xo_handle_t *xop, const char *name);
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int
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xo_open_list_d (const char *name);
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int
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xo_close_list_h (xo_handle_t *xop, const char *name);
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int
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xo_close_list (const char *name);
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int
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xo_close_list_hd (xo_handle_t *xop);
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int
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xo_close_list_d (void);
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int
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xo_open_instance_h (xo_handle_t *xop, const char *name);
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int
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xo_open_instance (const char *name);
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int
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xo_open_instance_hd (xo_handle_t *xop, const char *name);
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int
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xo_open_instance_d (const char *name);
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int
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xo_close_instance_h (xo_handle_t *xop, const char *name);
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int
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xo_close_instance (const char *name);
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int
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xo_close_instance_hd (xo_handle_t *xop);
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int
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xo_close_instance_d (void);
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int
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xo_open_marker_h (xo_handle_t *xop, const char *name);
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int
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xo_open_marker (const char *name);
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int
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xo_close_marker_h (xo_handle_t *xop, const char *name);
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int
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xo_close_marker (const char *name);
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int
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xo_attr_h (xo_handle_t *xop, const char *name, const char *fmt, ...);
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int
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xo_attr_hv (xo_handle_t *xop, const char *name, const char *fmt, va_list vap);
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int
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xo_attr (const char *name, const char *fmt, ...);
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void
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xo_error_hv (xo_handle_t *xop, const char *fmt, va_list vap);
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void
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xo_error_h (xo_handle_t *xop, const char *fmt, ...);
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void
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xo_error (const char *fmt, ...);
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int
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xo_flush_h (xo_handle_t *xop);
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int
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xo_flush (void);
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int
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xo_finish_h (xo_handle_t *xop);
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int
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xo_finish (void);
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void
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xo_finish_atexit (void);
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void
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xo_set_leading_xpath (xo_handle_t *xop, const char *path);
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void
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xo_warn_hc (xo_handle_t *xop, int code, const char *fmt, ...) PRINTFLIKE(3, 4);
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void
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xo_warn_c (int code, const char *fmt, ...) PRINTFLIKE(2, 3);
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void
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xo_warn (const char *fmt, ...) PRINTFLIKE(1, 2);
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void
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xo_warnx (const char *fmt, ...) PRINTFLIKE(1, 2);
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void
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xo_err (int eval, const char *fmt, ...) NORETURN PRINTFLIKE(2, 3);
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void
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xo_errx (int eval, const char *fmt, ...) NORETURN PRINTFLIKE(2, 3);
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void
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xo_errc (int eval, int code, const char *fmt, ...) NORETURN PRINTFLIKE(3, 4);
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void
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xo_message_hcv (xo_handle_t *xop, int code, const char *fmt, va_list vap) PRINTFLIKE(3, 0);
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void
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xo_message_hc (xo_handle_t *xop, int code, const char *fmt, ...) PRINTFLIKE(3, 4);
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void
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xo_message_c (int code, const char *fmt, ...) PRINTFLIKE(2, 3);
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void
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xo_message_e (const char *fmt, ...) PRINTFLIKE(1, 2);
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void
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xo_message (const char *fmt, ...) PRINTFLIKE(1, 2);
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void
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xo_emit_warn_hcv (xo_handle_t *xop, int as_warning, int code,
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const char *fmt, va_list vap);
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void
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xo_emit_warn_hc (xo_handle_t *xop, int code, const char *fmt, ...);
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void
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xo_emit_warn_c (int code, const char *fmt, ...);
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void
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xo_emit_warn (const char *fmt, ...);
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void
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xo_emit_warnx (const char *fmt, ...);
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void
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xo_emit_err (int eval, const char *fmt, ...) NORETURN;
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void
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xo_emit_errx (int eval, const char *fmt, ...) NORETURN;
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void
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xo_emit_errc (int eval, int code, const char *fmt, ...) NORETURN;
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PRINTFLIKE(4, 0)
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static inline void
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xo_emit_warn_hcvp (xo_handle_t *xop, int as_warning, int code,
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const char *fmt, va_list vap)
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{
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xo_emit_warn_hcv(xop, as_warning, code, fmt, vap);
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}
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PRINTFLIKE(3, 4)
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static inline void
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xo_emit_warn_hcp (xo_handle_t *xop, int code, const char *fmt, ...)
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{
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va_list vap;
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va_start(vap, fmt);
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xo_emit_warn_hcv(xop, 1, code, fmt, vap);
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va_end(vap);
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}
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PRINTFLIKE(2, 3)
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static inline void
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xo_emit_warn_cp (int code, const char *fmt, ...)
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{
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va_list vap;
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va_start(vap, fmt);
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xo_emit_warn_hcv(NULL, 1, code, fmt, vap);
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va_end(vap);
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}
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PRINTFLIKE(1, 2)
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static inline void
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xo_emit_warn_p (const char *fmt, ...)
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{
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int code = errno;
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va_list vap;
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va_start(vap, fmt);
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xo_emit_warn_hcv(NULL, 1, code, fmt, vap);
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va_end(vap);
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}
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PRINTFLIKE(1, 2)
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static inline void
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xo_emit_warnx_p (const char *fmt, ...)
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{
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va_list vap;
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va_start(vap, fmt);
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xo_emit_warn_hcv(NULL, 1, -1, fmt, vap);
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va_end(vap);
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}
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|
|
|
NORETURN PRINTFLIKE(2, 3)
|
|
static inline void
|
|
xo_emit_err_p (int eval, const char *fmt, ...)
|
|
{
|
|
int code = errno;
|
|
va_list vap;
|
|
va_start(vap, fmt);
|
|
xo_emit_warn_hcv(NULL, 0, code, fmt, vap);
|
|
va_end(vap);
|
|
|
|
exit(eval);
|
|
}
|
|
|
|
PRINTFLIKE(2, 3)
|
|
static inline void
|
|
xo_emit_errx_p (int eval, const char *fmt, ...)
|
|
{
|
|
va_list vap;
|
|
va_start(vap, fmt);
|
|
xo_emit_warn_hcv(NULL, 0, -1, fmt, vap);
|
|
va_end(vap);
|
|
exit(eval);
|
|
}
|
|
|
|
PRINTFLIKE(3, 4)
|
|
static inline void
|
|
xo_emit_errc_p (int eval, int code, const char *fmt, ...)
|
|
{
|
|
va_list vap;
|
|
va_start(vap, fmt);
|
|
xo_emit_warn_hcv(NULL, 0, code, fmt, vap);
|
|
va_end(vap);
|
|
exit(eval);
|
|
}
|
|
|
|
void
|
|
xo_emit_err_v (int eval, int code, const char *fmt, va_list vap) NORETURN PRINTFLIKE(3, 0);
|
|
|
|
void
|
|
xo_no_setlocale (void);
|
|
|
|
/**
|
|
* @brief Lift libxo-specific arguments from a set of arguments
|
|
*
|
|
* libxo-enable programs typically use command line options to enable
|
|
* all the nifty-cool libxo features. xo_parse_args() makes this simple
|
|
* by pre-processing the command line arguments given to main(), handling
|
|
* and removing the libxo-specific ones, meaning anything starting with
|
|
* "--libxo". A full description of these arguments is in the base
|
|
* documentation.
|
|
* @param[in] argc Number of arguments (ala #main())
|
|
* @param[in] argc Array of argument strings (ala #main())
|
|
* @return New number of arguments, or -1 for failure.
|
|
*/
|
|
int
|
|
xo_parse_args (int argc, char **argv);
|
|
|
|
/**
|
|
* This is the "magic" number returned by libxo-supporting commands
|
|
* when passed the equally magic "--libxo-check" option. If you
|
|
* return this, we can (unsafely) assume that since you know the magic
|
|
* handshake, you'll happily handle future --libxo options and not do
|
|
* something violent like reboot the box or create another hole in the
|
|
* ozone layer.
|
|
*/
|
|
#define XO_HAS_LIBXO 121
|
|
|
|
/**
|
|
* externs for libxo's version number strings
|
|
*/
|
|
extern const char xo_version[]; /** Base version triple string */
|
|
extern const char xo_version_extra[]; /** Extra version magic content */
|
|
|
|
/**
|
|
* @brief Dump the internal stack of a libxo handle.
|
|
*
|
|
* This diagnostic function is something I will ask you to call from
|
|
* your program when you write to tell me libxo has gone bat-stink
|
|
* crazy and has discarded your list or container or content. Output
|
|
* content will be what we lovingly call "developer entertainment".
|
|
* @param[in] xop A valid libxo handle, or NULL for the default handle
|
|
*/
|
|
void
|
|
xo_dump_stack (xo_handle_t *xop);
|
|
|
|
/**
|
|
* @brief Recode the name of the program, suitable for error output.
|
|
*
|
|
* libxo will record the given name for use while generating error
|
|
* messages. The contents are not copied, so the value must continue
|
|
* to point to a valid memory location. This allows the caller to change
|
|
* the value, but requires the caller to manage the memory. Typically
|
|
* this is called with argv[0] from main().
|
|
* @param[in] name The name of the current application program
|
|
*/
|
|
void
|
|
xo_set_program (const char *name);
|
|
|
|
/**
|
|
* @brief Add a version string to the output, where possible.
|
|
*
|
|
* Adds a version number to the output, suitable for tracking
|
|
* changes in the content. This is only important for the "encoding"
|
|
* format styles (XML and JSON) and allows a user of the data to
|
|
* discern which version of the data model is in use.
|
|
* @param[in] version The version number, encoded as a string
|
|
*/
|
|
void
|
|
xo_set_version (const char *version);
|
|
|
|
/**
|
|
* #xo_set_version with a handle.
|
|
* @param[in] xop A valid libxo handle, or NULL for the default handle
|
|
* @param[in] version The version number, encoded as a string
|
|
*/
|
|
void
|
|
xo_set_version_h (xo_handle_t *xop, const char *version);
|
|
|
|
void
|
|
xo_open_log (const char *ident, int logopt, int facility);
|
|
|
|
void
|
|
xo_close_log (void);
|
|
|
|
int
|
|
xo_set_logmask (int maskpri);
|
|
|
|
void
|
|
xo_set_unit_test_mode (int value);
|
|
|
|
void
|
|
xo_syslog (int priority, const char *name, const char *message, ...);
|
|
|
|
void
|
|
xo_vsyslog (int priority, const char *name, const char *message, va_list args);
|
|
|
|
typedef void (*xo_syslog_open_t)(void);
|
|
typedef void (*xo_syslog_send_t)(const char *full_msg,
|
|
const char *v0_hdr, const char *text_only);
|
|
typedef void (*xo_syslog_close_t)(void);
|
|
|
|
void
|
|
xo_set_syslog_handler (xo_syslog_open_t open_func, xo_syslog_send_t send_func,
|
|
xo_syslog_close_t close_func);
|
|
|
|
void
|
|
xo_set_syslog_enterprise_id (unsigned short eid);
|
|
|
|
typedef void (*xo_simplify_field_func_t)(const char *, unsigned, int);
|
|
|
|
char *
|
|
xo_simplify_format (xo_handle_t *xop, const char *fmt, int with_numbers,
|
|
xo_simplify_field_func_t field_cb);
|
|
|
|
int
|
|
xo_emit_field_hv (xo_handle_t *xop, const char *rolmod, const char *contents,
|
|
const char *fmt, const char *efmt,
|
|
va_list vap);
|
|
|
|
int
|
|
xo_emit_field_h (xo_handle_t *xop, const char *rolmod, const char *contents,
|
|
const char *fmt, const char *efmt, ...);
|
|
|
|
int
|
|
xo_emit_field (const char *rolmod, const char *contents,
|
|
const char *fmt, const char *efmt, ...);
|
|
|
|
void
|
|
xo_retain_clear_all (void);
|
|
|
|
void
|
|
xo_retain_clear (const char *fmt);
|
|
|
|
#endif /* INCLUDE_XO_H */
|