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314 lines
6.2 KiB
C
314 lines
6.2 KiB
C
/*
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* Private functions for Mini-XML, a small XML file parsing library.
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*
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* https://www.msweet.org/mxml
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*
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* Copyright © 2003-2019 by Michael R Sweet.
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*
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* Licensed under Apache License v2.0. See the file "LICENSE" for more
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* information.
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*/
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/*
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* Include necessary headers...
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*/
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#include "mxml-private.h"
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/*
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* Some crazy people think that unloading a shared object is a good or safe
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* thing to do. Unfortunately, most objects are simply *not* safe to unload
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* and bad things *will* happen.
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*
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* The following mess of conditional code allows us to provide a destructor
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* function in Mini-XML for our thread-global storage so that it can possibly
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* be unloaded safely, although since there is no standard way to do so I
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* can't even provide any guarantees that you can do it safely on all platforms.
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*
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* This code currently supports AIX, HP-UX, Linux, Mac OS X, Solaris, and
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* Windows. It might work on the BSDs and IRIX, but I haven't tested that.
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*/
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#if defined(__sun) || defined(_AIX)
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# pragma fini(_mxml_fini)
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# define _MXML_FINI _mxml_fini
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#elif defined(__hpux)
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# pragma FINI _mxml_fini
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# define _MXML_FINI _mxml_fini
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#elif defined(__GNUC__) /* Linux and Mac OS X */
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# define _MXML_FINI __attribute((destructor)) _mxml_fini
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#else
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# define _MXML_FINI _fini
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#endif /* __sun */
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/*
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* 'mxml_error()' - Display an error message.
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*/
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void
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mxml_error(const char *format, /* I - Printf-style format string */
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...) /* I - Additional arguments as needed */
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{
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va_list ap; /* Pointer to arguments */
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char s[1024]; /* Message string */
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_mxml_global_t *global = _mxml_global();
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/* Global data */
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/*
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* Range check input...
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*/
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if (!format)
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return;
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/*
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* Format the error message string...
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*/
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va_start(ap, format);
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vsnprintf(s, sizeof(s), format, ap);
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va_end(ap);
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/*
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* And then display the error message...
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*/
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if (global->error_cb)
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(*global->error_cb)(s);
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else
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fprintf(stderr, "mxml: %s\n", s);
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}
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/*
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* 'mxml_ignore_cb()' - Default callback for ignored values.
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*/
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mxml_type_t /* O - Node type */
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mxml_ignore_cb(mxml_node_t *node) /* I - Current node */
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{
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(void)node;
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return (MXML_IGNORE);
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}
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/*
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* 'mxml_integer_cb()' - Default callback for integer values.
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*/
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mxml_type_t /* O - Node type */
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mxml_integer_cb(mxml_node_t *node) /* I - Current node */
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{
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(void)node;
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return (MXML_INTEGER);
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}
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/*
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* 'mxml_opaque_cb()' - Default callback for opaque values.
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*/
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mxml_type_t /* O - Node type */
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mxml_opaque_cb(mxml_node_t *node) /* I - Current node */
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{
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(void)node;
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return (MXML_OPAQUE);
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}
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/*
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* 'mxml_real_cb()' - Default callback for real number values.
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*/
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mxml_type_t /* O - Node type */
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mxml_real_cb(mxml_node_t *node) /* I - Current node */
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{
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(void)node;
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return (MXML_REAL);
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}
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#ifdef HAVE_PTHREAD_H /**** POSIX threading ****/
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# include <pthread.h>
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static pthread_key_t _mxml_key = -1; /* Thread local storage key */
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static pthread_once_t _mxml_key_once = PTHREAD_ONCE_INIT;
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/* One-time initialization object */
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static void _mxml_init(void);
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static void _mxml_destructor(void *g);
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/*
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* '_mxml_destructor()' - Free memory used for globals...
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*/
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static void
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_mxml_destructor(void *g) /* I - Global data */
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{
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free(g);
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}
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/*
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* '_mxml_fini()' - Clean up when unloaded.
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*/
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static void
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_MXML_FINI(void)
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{
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_mxml_global_t *global; /* Global data */
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if (_mxml_key != -1)
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{
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if ((global = (_mxml_global_t *)pthread_getspecific(_mxml_key)) != NULL)
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_mxml_destructor(global);
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pthread_key_delete(_mxml_key);
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_mxml_key = -1;
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}
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}
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/*
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* '_mxml_global()' - Get global data.
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*/
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_mxml_global_t * /* O - Global data */
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_mxml_global(void)
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{
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_mxml_global_t *global; /* Global data */
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pthread_once(&_mxml_key_once, _mxml_init);
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if ((global = (_mxml_global_t *)pthread_getspecific(_mxml_key)) == NULL)
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{
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global = (_mxml_global_t *)calloc(1, sizeof(_mxml_global_t));
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pthread_setspecific(_mxml_key, global);
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global->num_entity_cbs = 1;
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global->entity_cbs[0] = _mxml_entity_cb;
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global->wrap = 72;
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}
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return (global);
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}
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/*
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* '_mxml_init()' - Initialize global data...
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*/
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static void
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_mxml_init(void)
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{
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pthread_key_create(&_mxml_key, _mxml_destructor);
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}
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#elif defined(_WIN32) && defined(MXML1_EXPORTS) /**** WIN32 threading ****/
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# include <windows.h>
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static DWORD _mxml_tls_index; /* Index for global storage */
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/*
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* 'DllMain()' - Main entry for library.
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*/
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BOOL WINAPI /* O - Success/failure */
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DllMain(HINSTANCE hinst, /* I - DLL module handle */
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DWORD reason, /* I - Reason */
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LPVOID reserved) /* I - Unused */
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{
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_mxml_global_t *global; /* Global data */
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(void)hinst;
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(void)reserved;
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switch (reason)
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{
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case DLL_PROCESS_ATTACH : /* Called on library initialization */
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if ((_mxml_tls_index = TlsAlloc()) == TLS_OUT_OF_INDEXES)
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return (FALSE);
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break;
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case DLL_THREAD_DETACH : /* Called when a thread terminates */
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if ((global = (_mxml_global_t *)TlsGetValue(_mxml_tls_index)) != NULL)
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free(global);
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break;
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case DLL_PROCESS_DETACH : /* Called when library is unloaded */
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if ((global = (_mxml_global_t *)TlsGetValue(_mxml_tls_index)) != NULL)
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free(global);
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TlsFree(_mxml_tls_index);
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break;
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default:
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break;
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}
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return (TRUE);
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}
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/*
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* '_mxml_global()' - Get global data.
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*/
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_mxml_global_t * /* O - Global data */
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_mxml_global(void)
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{
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_mxml_global_t *global; /* Global data */
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if ((global = (_mxml_global_t *)TlsGetValue(_mxml_tls_index)) == NULL)
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{
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global = (_mxml_global_t *)calloc(1, sizeof(_mxml_global_t));
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global->num_entity_cbs = 1;
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global->entity_cbs[0] = _mxml_entity_cb;
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global->wrap = 72;
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TlsSetValue(_mxml_tls_index, (LPVOID)global);
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}
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return (global);
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}
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#else /**** No threading ****/
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/*
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* '_mxml_global()' - Get global data.
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*/
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_mxml_global_t * /* O - Global data */
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_mxml_global(void)
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{
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static _mxml_global_t global = /* Global data */
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{
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NULL, /* error_cb */
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1, /* num_entity_cbs */
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{ _mxml_entity_cb }, /* entity_cbs */
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72, /* wrap */
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NULL, /* custom_load_cb */
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NULL /* custom_save_cb */
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};
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return (&global);
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}
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#endif /* HAVE_PTHREAD_H */
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