Apache Portable Runtime
apr_general.h
Go to the documentation of this file.
1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2  * contributor license agreements. See the NOTICE file distributed with
3  * this work for additional information regarding copyright ownership.
4  * The ASF licenses this file to You under the Apache License, Version 2.0
5  * (the "License"); you may not use this file except in compliance with
6  * the License. You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef APR_GENERAL_H
18 #define APR_GENERAL_H
19 
20 /**
21  * @file apr_general.h
22  * This is collection of oddballs that didn't fit anywhere else,
23  * and might move to more appropriate headers with the release
24  * of APR 1.0.
25  * @brief APR Miscellaneous library routines
26  */
27 
28 #include "apr.h"
29 #include "apr_pools.h"
30 #include "apr_errno.h"
31 
32 #if APR_HAVE_SIGNAL_H
33 #include <signal.h>
34 #endif
35 
36 #ifdef __cplusplus
37 extern "C" {
38 #endif /* __cplusplus */
39 
40 /**
41  * @defgroup apr_general Miscellaneous library routines
42  * @ingroup APR
43  * This is collection of oddballs that didn't fit anywhere else,
44  * and might move to more appropriate headers with the release
45  * of APR 1.0.
46  * @{
47  */
48 
49 /** FALSE */
50 #ifndef FALSE
51 #define FALSE 0
52 #endif
53 /** TRUE */
54 #ifndef TRUE
55 #define TRUE (!FALSE)
56 #endif
57 
58 /** a space */
59 #define APR_ASCII_BLANK '\040'
60 /** a carrige return */
61 #define APR_ASCII_CR '\015'
62 /** a line feed */
63 #define APR_ASCII_LF '\012'
64 /** a tab */
65 #define APR_ASCII_TAB '\011'
66 
67 /** signal numbers typedef */
68 typedef int apr_signum_t;
69 
70 /**
71  * Finding offsets of elements within structures.
72  * Taken from the X code... they've sweated portability of this stuff
73  * so we don't have to. Sigh...
74  * @param p_type pointer type name
75  * @param field data field within the structure pointed to
76  * @return offset
77  */
78 
79 #if defined(CRAY) || (defined(__arm) && !(defined(LINUX) || defined(__FreeBSD__)))
80 #ifdef __STDC__
81 #define APR_OFFSET(p_type,field) _Offsetof(p_type,field)
82 #else
83 #ifdef CRAY2
84 #define APR_OFFSET(p_type,field) \
85  (sizeof(int)*((unsigned int)&(((p_type)NULL)->field)))
86 
87 #else /* !CRAY2 */
88 
89 #define APR_OFFSET(p_type,field) ((unsigned int)&(((p_type)NULL)->field))
90 
91 #endif /* !CRAY2 */
92 #endif /* __STDC__ */
93 #else /* ! (CRAY || __arm) */
94 
95 #define APR_OFFSET(p_type,field) \
96  ((long) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
97 
98 #endif /* !CRAY */
99 
100 /**
101  * Finding offsets of elements within structures.
102  * @param s_type structure type name
103  * @param field data field within the structure
104  * @return offset
105  */
106 #if defined(offsetof) && !defined(__cplusplus)
107 #define APR_OFFSETOF(s_type,field) offsetof(s_type,field)
108 #else
109 #define APR_OFFSETOF(s_type,field) APR_OFFSET(s_type*,field)
110 #endif
111 
112 #ifndef DOXYGEN
113 
114 /* A couple of prototypes for functions in case some platform doesn't
115  * have it
116  */
117 #if (!APR_HAVE_STRCASECMP) && (APR_HAVE_STRICMP)
118 #define strcasecmp(s1, s2) stricmp(s1, s2)
119 #elif (!APR_HAVE_STRCASECMP)
120 int strcasecmp(const char *a, const char *b);
121 #endif
122 
123 #if (!APR_HAVE_STRNCASECMP) && (APR_HAVE_STRNICMP)
124 #define strncasecmp(s1, s2, n) strnicmp(s1, s2, n)
125 #elif (!APR_HAVE_STRNCASECMP)
126 int strncasecmp(const char *a, const char *b, size_t n);
127 #endif
128 
129 #endif
130 
131 /**
132  * Alignment macros
133  */
134 
135 /* APR_ALIGN() is only to be used to align on a power of 2 boundary */
136 #define APR_ALIGN(size, boundary) \
137  (((size) + ((boundary) - 1)) & ~((boundary) - 1))
138 
139 /** Default alignment */
140 #define APR_ALIGN_DEFAULT(size) APR_ALIGN(size, 8)
141 
142 
143 /**
144  * String and memory functions
145  */
146 
147 /* APR_STRINGIFY is defined here, and also in apr_release.h, so wrap it */
148 #ifndef APR_STRINGIFY
149 /** Properly quote a value as a string in the C preprocessor */
150 #define APR_STRINGIFY(n) APR_STRINGIFY_HELPER(n)
151 /** Helper macro for APR_STRINGIFY */
152 #define APR_STRINGIFY_HELPER(n) #n
153 #endif
154 
155 #if (!APR_HAVE_MEMMOVE)
156 #define memmove(a,b,c) bcopy(b,a,c)
157 #endif
158 
159 #if (!APR_HAVE_MEMCHR)
160 void *memchr(const void *s, int c, size_t n);
161 #endif
162 
163 /** @} */
164 
165 /**
166  * @defgroup apr_library Library initialization and termination
167  * @{
168  */
169 
170 /**
171  * Setup any APR internal data structures. This MUST be the first function
172  * called for any APR library. It is safe to call apr_initialize several
173  * times as long as apr_terminate is called the same number of times.
174  * @remark See apr_app_initialize if this is an application, rather than
175  * a library consumer of apr.
176  */
178 
179 /**
180  * Set up an application with normalized argc, argv (and optionally env) in
181  * order to deal with platform-specific oddities, such as Win32 services,
182  * code pages and signals. This must be the first function called for any
183  * APR program.
184  * @param argc Pointer to the argc that may be corrected
185  * @param argv Pointer to the argv that may be corrected
186  * @param env Pointer to the env that may be corrected, may be NULL
187  * @remark See apr_initialize if this is a library consumer of apr.
188  * Otherwise, this call is identical to apr_initialize, and must be closed
189  * with a call to apr_terminate at the end of program execution.
190  */
192  char const * const * *argv,
193  char const * const * *env);
194 
195 /**
196  * Tear down any APR internal data structures which aren't torn down
197  * automatically. apr_terminate must be called once for every call to
198  * apr_initialize() or apr_app_initialize().
199  * @remark An APR program must call this function at termination once it
200  * has stopped using APR services. The APR developers suggest using
201  * atexit to ensure this is called. When using APR from a language
202  * other than C that has problems with the calling convention, use
203  * apr_terminate2() instead.
204  */
206 
207 /**
208  * Tear down any APR internal data structures which aren't torn down
209  * automatically, same as apr_terminate
210  * @remark An APR program must call either the apr_terminate or apr_terminate2
211  * function once it it has finished using APR services. The APR
212  * developers suggest using atexit(apr_terminate) to ensure this is done.
213  * apr_terminate2 exists to allow non-c language apps to tear down apr,
214  * while apr_terminate is recommended from c language applications.
215  */
216 APR_DECLARE(void) apr_terminate2(void);
217 
218 /** @} */
219 
220 /**
221  * @defgroup apr_random Random Functions
222  * @{
223  */
224 
225 #if APR_HAS_RANDOM || defined(DOXYGEN)
226 
227 /* TODO: I'm not sure this is the best place to put this prototype...*/
228 /**
229  * Generate random bytes.
230  * @param buf Buffer to fill with random bytes
231  * @param length Length of buffer in bytes
232  */
234  apr_size_t length);
235 
236 #endif
237 /** @} */
238 
239 #ifdef __cplusplus
240 }
241 #endif
242 
243 #endif /* ! APR_GENERAL_H */
int apr_signum_t
Definition: apr_general.h:68
apr_status_t apr_generate_random_bytes(unsigned char *buf, apr_size_t length)
apr_status_t apr_app_initialize(int *argc, char const *const **argv, char const *const **env)
APR memory allocation.
void apr_terminate2(void)
apr_status_t apr_initialize(void)
APR Error Codes.
#define APR_DECLARE(type)
Definition: apr.h:479
APR Platform Definitions.
#define APR_DECLARE_NONSTD(type)
Definition: apr.h:492
int apr_status_t
Definition: apr_errno.h:44
void apr_terminate(void)