apr_general.h

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00001 /* Licensed to the Apache Software Foundation (ASF) under one or more
00002  * contributor license agreements.  See the NOTICE file distributed with
00003  * this work for additional information regarding copyright ownership.
00004  * The ASF licenses this file to You under the Apache License, Version 2.0
00005  * (the "License"); you may not use this file except in compliance with
00006  * the License.  You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #ifndef APR_GENERAL_H
00018 #define APR_GENERAL_H
00019 
00020 /**
00021  * @file apr_general.h
00022  * This is collection of oddballs that didn't fit anywhere else,
00023  * and might move to more appropriate headers with the release
00024  * of APR 1.0.
00025  * @brief APR Miscellaneous library routines
00026  */
00027 
00028 #include "apr.h"
00029 #include "apr_pools.h"
00030 #include "apr_errno.h"
00031 
00032 #if APR_HAVE_SIGNAL_H
00033 #include <signal.h>
00034 #endif
00035 
00036 #ifdef __cplusplus
00037 extern "C" {
00038 #endif /* __cplusplus */
00039 
00040 /**
00041  * @defgroup apr_general Miscellaneous library routines
00042  * @ingroup APR 
00043  * This is collection of oddballs that didn't fit anywhere else,
00044  * and might move to more appropriate headers with the release
00045  * of APR 1.0.
00046  * @{
00047  */
00048 
00049 /** FALSE */
00050 #ifndef FALSE
00051 #define FALSE 0
00052 #endif
00053 /** TRUE */
00054 #ifndef TRUE
00055 #define TRUE (!FALSE)
00056 #endif
00057 
00058 /** a space */
00059 #define APR_ASCII_BLANK  '\040'
00060 /** a carrige return */
00061 #define APR_ASCII_CR     '\015'
00062 /** a line feed */
00063 #define APR_ASCII_LF     '\012'
00064 /** a tab */
00065 #define APR_ASCII_TAB    '\011'
00066 
00067 /** signal numbers typedef */
00068 typedef int               apr_signum_t;
00069 
00070 /**
00071  * Finding offsets of elements within structures.
00072  * Taken from the X code... they've sweated portability of this stuff
00073  * so we don't have to.  Sigh...
00074  * @param p_type pointer type name
00075  * @param field  data field within the structure pointed to
00076  * @return offset
00077  */
00078 
00079 #if defined(CRAY) || (defined(__arm) && !defined(LINUX))
00080 #ifdef __STDC__
00081 #define APR_OFFSET(p_type,field) _Offsetof(p_type,field)
00082 #else
00083 #ifdef CRAY2
00084 #define APR_OFFSET(p_type,field) \
00085         (sizeof(int)*((unsigned int)&(((p_type)NULL)->field)))
00086 
00087 #else /* !CRAY2 */
00088 
00089 #define APR_OFFSET(p_type,field) ((unsigned int)&(((p_type)NULL)->field))
00090 
00091 #endif /* !CRAY2 */
00092 #endif /* __STDC__ */
00093 #else /* ! (CRAY || __arm) */
00094 
00095 #define APR_OFFSET(p_type,field) \
00096         ((long) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
00097 
00098 #endif /* !CRAY */
00099 
00100 /**
00101  * Finding offsets of elements within structures.
00102  * @param s_type structure type name
00103  * @param field  data field within the structure
00104  * @return offset
00105  */
00106 #if defined(offsetof) && !defined(__cplusplus)
00107 #define APR_OFFSETOF(s_type,field) offsetof(s_type,field)
00108 #else
00109 #define APR_OFFSETOF(s_type,field) APR_OFFSET(s_type*,field)
00110 #endif
00111 
00112 #ifndef DOXYGEN
00113 
00114 /* A couple of prototypes for functions in case some platform doesn't 
00115  * have it
00116  */
00117 #if (!APR_HAVE_STRCASECMP) && (APR_HAVE_STRICMP) 
00118 #define strcasecmp(s1, s2) stricmp(s1, s2)
00119 #elif (!APR_HAVE_STRCASECMP)
00120 int strcasecmp(const char *a, const char *b);
00121 #endif
00122 
00123 #if (!APR_HAVE_STRNCASECMP) && (APR_HAVE_STRNICMP)
00124 #define strncasecmp(s1, s2, n) strnicmp(s1, s2, n)
00125 #elif (!APR_HAVE_STRNCASECMP)
00126 int strncasecmp(const char *a, const char *b, size_t n);
00127 #endif
00128 
00129 #endif
00130 
00131 /**
00132  * Alignment macros
00133  */
00134 
00135 /* APR_ALIGN() is only to be used to align on a power of 2 boundary */
00136 #define APR_ALIGN(size, boundary) \
00137     (((size) + ((boundary) - 1)) & ~((boundary) - 1))
00138 
00139 /** Default alignment */
00140 #define APR_ALIGN_DEFAULT(size) APR_ALIGN(size, 8)
00141 
00142 
00143 /**
00144  * String and memory functions
00145  */
00146 
00147 /* APR_STRINGIFY is defined here, and also in apr_release.h, so wrap it */
00148 #ifndef APR_STRINGIFY
00149 /** Properly quote a value as a string in the C preprocessor */
00150 #define APR_STRINGIFY(n) APR_STRINGIFY_HELPER(n)
00151 /** Helper macro for APR_STRINGIFY */
00152 #define APR_STRINGIFY_HELPER(n) #n
00153 #endif
00154 
00155 #if (!APR_HAVE_MEMMOVE)
00156 #define memmove(a,b,c) bcopy(b,a,c)
00157 #endif
00158 
00159 #if (!APR_HAVE_MEMCHR)
00160 void *memchr(const void *s, int c, size_t n);
00161 #endif
00162 
00163 /** @} */
00164 
00165 /**
00166  * @defgroup apr_library Library initialization and termination
00167  * @{
00168  */
00169 
00170 /**
00171  * Setup any APR internal data structures.  This MUST be the first function 
00172  * called for any APR library.
00173  * @remark See apr_app_initialize if this is an application, rather than
00174  * a library consumer of apr.
00175  */
00176 APR_DECLARE(apr_status_t) apr_initialize(void);
00177 
00178 /**
00179  * Set up an application with normalized argc, argv (and optionally env) in
00180  * order to deal with platform-specific oddities, such as Win32 services,
00181  * code pages and signals.  This must be the first function called for any
00182  * APR program.
00183  * @param argc Pointer to the argc that may be corrected
00184  * @param argv Pointer to the argv that may be corrected
00185  * @param env Pointer to the env that may be corrected, may be NULL
00186  * @remark See apr_initialize if this is a library consumer of apr.
00187  * Otherwise, this call is identical to apr_initialize, and must be closed
00188  * with a call to apr_terminate at the end of program execution.
00189  */
00190 APR_DECLARE(apr_status_t) apr_app_initialize(int *argc, 
00191                                              char const * const * *argv, 
00192                                              char const * const * *env);
00193 
00194 /**
00195  * Tear down any APR internal data structures which aren't torn down 
00196  * automatically.
00197  * @remark An APR program must call this function at termination once it 
00198  *         has stopped using APR services.  The APR developers suggest using
00199  *         atexit to ensure this is called.  When using APR from a language
00200  *         other than C that has problems with the calling convention, use
00201  *         apr_terminate2() instead.
00202  */
00203 APR_DECLARE_NONSTD(void) apr_terminate(void);
00204 
00205 /**
00206  * Tear down any APR internal data structures which aren't torn down 
00207  * automatically, same as apr_terminate
00208  * @remark An APR program must call either the apr_terminate or apr_terminate2 
00209  *         function once it it has finished using APR services.  The APR 
00210  *         developers suggest using atexit(apr_terminate) to ensure this is done.
00211  *         apr_terminate2 exists to allow non-c language apps to tear down apr, 
00212  *         while apr_terminate is recommended from c language applications.
00213  */
00214 APR_DECLARE(void) apr_terminate2(void);
00215 
00216 /** @} */
00217 
00218 /**
00219  * @defgroup apr_random Random Functions
00220  * @{
00221  */
00222 
00223 #if APR_HAS_RANDOM || defined(DOXYGEN)
00224 
00225 /* TODO: I'm not sure this is the best place to put this prototype...*/
00226 /**
00227  * Generate random bytes.
00228  * @param buf Buffer to fill with random bytes
00229  * @param length Length of buffer in bytes
00230  */
00231 APR_DECLARE(apr_status_t) apr_generate_random_bytes(unsigned char * buf, 
00232                                                     apr_size_t length);
00233 
00234 #endif
00235 /** @} */
00236 
00237 #ifdef __cplusplus
00238 }
00239 #endif
00240 
00241 #endif  /* ! APR_GENERAL_H */

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