|
/**
* Get the elements from a table
* @param t The table
* @return An array containing the contents of the table
*/
APR_DECLARE(const apr_array_header_t *) apr_table_elts(const apr_table_t *t);
/**
* Determine if the table is empty
* @param t The table to check
* @return True if empty, False otherwise
*/
APR_DECLARE(int) apr_is_empty_table(const apr_table_t *t);
/**
* Determine if the array is empty
* @param a The array to check
* @return True if empty, False otherwise
*/
APR_DECLARE(int) apr_is_empty_array(const apr_array_header_t *a);
/**
* Create an array
* @param p The pool to allocate the memory out of
* @param nelts the number of elements in the initial array
* @param elt_size The size of each element in the array.
* @return The new array
*/
APR_DECLARE(apr_array_header_t *) apr_array_make(apr_pool_t *p,
int nelts, int elt_size);
/**
* Add a new element to an array (as a first-in, last-out stack)
* @param arr The array to add an element to.
* @return Location for the new element in the array.
* @remark If there are no free spots in the array, then this function will
* allocate new space for the new element.
*/
APR_DECLARE(void *) apr_array_push(apr_array_header_t *arr);
/**
* Remove an element from an array (as a first-in, last-out stack)
* @param arr The array to remove an element from.
* @return Location of the element in the array.
* @remark If there are no elements in the array, NULL is returned.
*/
APR_DECLARE(void *) apr_array_pop(apr_array_header_t *arr);
/**
* Concatenate two arrays together
* @param dst The destination array, and the one to go first in the combined
* array
* @param src The source array to add to the destination array
*/
APR_DECLARE(void) apr_array_cat(apr_array_header_t *dst,
const apr_array_header_t *src);
/**
* Copy the entire array
* @param p The pool to allocate the copy of the array out of
* @param arr The array to copy
* @return An exact copy of the array passed in
* @remark The alternate apr_array_copy_hdr copies only the header, and arranges
* for the elements to be copied if (and only if) the code subsequently
* does a push or arraycat.
*/
APR_DECLARE(apr_array_header_t *) apr_array_copy(apr_pool_t *p,
const apr_array_header_t *arr);
/**
* Copy the headers of the array, and arrange for the elements to be copied if
* and only if the code subsequently does a push or arraycat.
* @param p The pool to allocate the copy of the array out of
* @param arr The array to copy
* @return An exact copy of the array passed in
* @remark The alternate apr_array_copy copies the *entire* array.
*/
APR_DECLARE(apr_array_header_t *) apr_array_copy_hdr(apr_pool_t *p,
const apr_array_header_t *arr);
/**
* Append one array to the end of another, creating a new array in the process.
* @param p The pool to allocate the new array out of
* @param first The array to put first in the new array.
* @param second The array to put second in the new array.
* @return A new array containing the data from the two arrays passed in.
*/
APR_DECLARE(apr_array_header_t *) apr_array_append(apr_pool_t *p,
const apr_array_header_t *first,
const apr_array_header_t *second);
/**
* Generates a new string from the apr_pool_t containing the concatenated
* sequence of substrings referenced as elements within the array. The string
* will be empty if all substrings are empty or null, or if there are no
* elements in the array. If sep is non-NUL, it will be inserted between
* elements as a separator.
* @param p The pool to allocate the string out of
* @param arr The array to generate the string from
* @param sep The separator to use
* @return A string containing all of the data in the array.
*/
APR_DECLARE(char *) apr_array_pstrcat(apr_pool_t *p,
const apr_array_header_t *arr,
const char sep);
/**
* Make a new table
* @param p The pool to allocate the pool out of
* @param nelts The number of elements in the initial table.
* @return The new table.
* @warning This table can only store text data
*/
APR_DECLARE(apr_table_t *) apr_table_make(apr_pool_t *p, int nelts);
/**
* Create a new table and copy another table into it
* @param p The pool to allocate the new table out of
* @param t The table to copy
* @return A copy of the table passed in
*/
APR_DECLARE(apr_table_t *) apr_table_copy(apr_pool_t *p,
const apr_table_t *t);
/**
* Delete all of the elements from a table
* @param t The table to clear
*/
APR_DECLARE(void) apr_table_clear(apr_table_t *t);
/**
* Get the value associated with a given key from the table. After this call,
* The data is still in the table
* @param t The table to search for the key
* @param key The key to search for
* @return The value associated with the key, or NULL if the key does not exist.
*/
APR_DECLARE(const char *) apr_table_get(const apr_table_t *t, const char *key);
/**
* Add a key/value pair to a table, if another element already exists with the
* same key, this will over-write the old data.
* @param t The table to add the data to.
* @param key The key fo use
* @param val The value to add
* @remark When adding data, this function makes a copy of both the key and the
* value.
*/
APR_DECLARE(void) apr_table_set(apr_table_t *t, const char *key,
const char *val);
/**
* Add a key/value pair to a table, if another element already exists with the
* same key, this will over-write the old data.
* @param t The table to add the data to.
* @param key The key to use
* @param val The value to add
* @warning When adding data, this function does not make a copy of the key or
* the value, so care should be taken to ensure that the values will
* not change after they have been added..
*/
APR_DECLARE(void) apr_table_setn(apr_table_t *t, const char *key,
const char *val);
/**
* Remove data from the table
* @param t The table to remove data from
* @param key The key of the data being removed
*/
APR_DECLARE(void) apr_table_unset(apr_table_t *t, const char *key);
/**
* Add data to a table by merging the value with data that has already been
* stored
* @param t The table to search for the data
* @param key The key to merge data for
* @param val The data to add
* @remark If the key is not found, then this function acts like apr_table_add
*/
APR_DECLARE(void) apr_table_merge(apr_table_t *t, const char *key,
const char *val);
/**
* Add data to a table by merging the value with data that has already been
* stored
* @param t The table to search for the data
* @param key The key to merge data for
* @param val The data to add
* @remark If the key is not found, then this function acts like apr_table_addn
*/
APR_DECLARE(void) apr_table_mergen(apr_table_t *t, const char *key,
const char *val);
/**
* Add data to a table, regardless of whether there is another element with the
* same key.
* @param t The table to add to
* @param key The key to use
* @param val The value to add.
* @remark When adding data, this function makes a copy of both the key and the
* value.
*/
APR_DECLARE(void) apr_table_add(apr_table_t *t, const char *key,
const char *val);
/**
* Add data to a table, regardless of whether there is another element with the
* same key.
* @param t The table to add to
* @param key The key to use
* @param val The value to add.
* @remark When adding data, this function does not make a copy of the key or the
* value, so care should be taken to ensure that the values will not
* change after they have been added..
*/
APR_DECLARE(void) apr_table_addn(apr_table_t *t, const char *key,
const char *val);
/**
* Merge two tables into one new table
* @param p The pool to use for the new table
* @param overlay The first table to put in the new table
* @param base The table to add at the end of the new table
* @return A new table containing all of the data from the two passed in
*/
APR_DECLARE(apr_table_t *) apr_table_overlay(apr_pool_t *p,
const apr_table_t *overlay,
const apr_table_t *base);
/**
* Declaration prototype for the iterator callback function of apr_table_do()
* and apr_table_vdo().
* @param rec The data passed as the first argument to apr_table_[v]do()
* @param key The key from this iteration of the table
* @param value The value from this iteration of the table
* @remark Iteration continues while this callback function returns non-zero.
* To export the callback function for apr_table_[v]do() it must be declared
* in the _NONSTD convention.
*/
typedef int (apr_table_do_callback_fn_t)(void *rec, const char *key,
const char *value);
/**
* Iterate over a table running the provided function once for every
* element in the table. If there is data passed in as a vararg, then the
* function is only run on those elements whose key matches something in
* the vararg. If the vararg is NULL, then every element is run through the
* function. Iteration continues while the function returns non-zero.
* @param comp The function to run
* @param rec The data to pass as the first argument to the function
* @param t The table to iterate over
* @param ... The vararg. If this is NULL, then all elements in the table are
* run through the function, otherwise only those whose key matches
* are run.
* @return FALSE if one of the comp() iterations returned zero; TRUE if all
* iterations returned non-zero
* @see apr_table_do_callback_fn_t
*/
APR_DECLARE_NONSTD(int) apr_table_do(apr_table_do_callback_fn_t *comp,
void *rec, const apr_table_t *t, ...);
/**
* Iterate over a table running the provided function once for every
* element in the table. If there is data passed in as a vararg, then the
* function is only run on those element's whose key matches something in
* the vararg. If the vararg is NULL, then every element is run through the
* function. Iteration continues while the function returns non-zero.
* @param comp The function to run
* @param rec The data to pass as the first argument to the function
* @param t The table to iterate over
* @param vp The vararg table. If this is NULL, then all elements in the
* table are run through the function, otherwise only those
* whose key matches are run.
* @return FALSE if one of the comp() iterations returned zero; TRUE if all
* iterations returned non-zero
* @see apr_table_do_callback_fn_t
*/
APR_DECLARE(int) apr_table_vdo(apr_table_do_callback_fn_t *comp,
void *rec, const apr_table_t *t, va_list vp);
/** flag for overlap to use apr_table_setn */
#define APR_OVERLAP_TABLES_SET (0)
/** flag for overlap to use apr_table_mergen */
#define APR_OVERLAP_TABLES_MERGE (1)
/**
* For each element in table b, either use setn or mergen to add the data
* to table a. Which method is used is determined by the flags passed in.
* @param a The table to add the data to.
* @param b The table to iterate over, adding its data to table a
* @param flags How to add the table to table a. One of:
* APR_OVERLAP_TABLES_SET Use apr_table_setn
* APR_OVERLAP_TABLES_MERGE Use apr_table_mergen
* @remark This function is highly optimized, and uses less memory and CPU cycles
* than a function that just loops through table b calling other functions.
*/
/**
*
* Conceptually, apr_table_overlap does this:
*
* apr_array_header_t *barr = apr_table_elts(b);
* apr_table_entry_t *belt = (apr_table_entry_t *)barr->elts;
* int i;
*
* for (i = 0; i < barr->nelts; ++i) {
* if (flags & APR_OVERLAP_TABLES_MERGE) {
* apr_table_mergen(a, belt[i].key, belt[i].val);
* }
* else {
* apr_table_setn(a, belt[i].key, belt[i].val);
* }
* }
*
* Except that it is more efficient (less space and cpu-time) especially
* when b has many elements.
*
* Notice the assumptions on the keys and values in b – they must be
* in an ancestor of a’s pool. In practice b and a are usually from
* the same pool.
*
*/
APR_DECLARE(void) apr_table_overlap(apr_table_t *a, const apr_table_t *b,
unsigned flags);
/**
* Eliminate redundant entries in a table by either overwriting
* or merging duplicates
*
* @param t Table.
* @param flags APR_OVERLAP_TABLES_MERGE to merge, or
* APR_OVERLAP_TABLES_SET to overwrite
*/
APR_DECLARE(void) apr_table_compress(apr_table_t *t, unsigned flags);
其他apr提供的数据结构还有：hash和list，这里不再详述。
(3) 字符串操作
写过C的人都知道，处理字符串是非常头痛的问题，搞不好就内存溢出，apr也提供一些字符串函数，都是基于apr_pool_t,
使用时不用担心内存溢出的问题。
把apr_strings.h贴出来大家一起看看,注释也比较详细，不多说：
/**
* Do a natural order comparison of two strings.
* @param a The first string to compare
* @param b The second string to compare
* @return Either <0, 0, or >0. If the first string is less than the second
* this returns <0, if they are equivalent it returns 0, and if the
* first string is greater than second string it retuns >0.
*/
APR_DECLARE(int) apr_strnatcmp(char const *a, char const *b);
/**
* Do a natural order comparison of two strings ignoring the case of the
* strings.
* @param a The first string to compare
* @param b The second string to compare
* @return Either <0, 0, or >0. If the first string is less than the second
* this returns <0, if they are equivalent it returns 0, and if the
* first string is greater than second string it retuns >0.
*/
APR_DECLARE(int) apr_strnatcasecmp(char const *a, char const *b);
/**
* duplicate a string into memory allocated out of a pool
* @param p The pool to allocate out of
* @param s The string to duplicate
* @return The new string
*/
APR_DECLARE(char *) apr_pstrdup(apr_pool_t *p, const char *s);
/**
* Create a null-terminated string by making a copy of a sequence
* of characters and appending a null byte
* @param p The pool to allocate out of
* @param s The block of characters to duplicate
* @param n The number of characters to duplicate
* @return The new string
* @remark This is a faster alternative to apr_pstrndup, for use
* when you know that the string being duplicated really
* has ’n' or more characters. If the string might contain
* fewer characters, use apr_pstrndup.
*/
APR_DECLARE(char *) apr_pstrmemdup(apr_pool_t *p, const char *s, apr_size_t n);
/**
* Duplicate at most n characters of a string into memory allocated
* out of a pool; the new string will be NUL-terminated
* @param p The pool to allocate out of
* @param s The string to duplicate
* @param n The maximum number of characters to duplicate
* @return The new string
* @remark The amount of memory allocated from the pool is the length
* of the returned string including the NUL terminator
*/
APR_DECLARE(char *) apr_pstrndup(apr_pool_t *p, const char *s, apr_size_t n);
/**
* Duplicate a block of memory.
*
* @param p The pool to allocate from
* @param m The memory to duplicate
* @param n The number of bytes to duplicate
* @return The new block of memory
*/
APR_DECLARE(void *) apr_pmemdup(apr_pool_t *p, const void *m, apr_size_t n);
/**
* Concatenate multiple strings, allocating memory out a pool
* @param p The pool to allocate out of
* @param … The strings to concatenate. The final string must be NULL
* @return The new string
*/
APR_DECLARE_NONSTD(char *) apr_pstrcat(apr_pool_t *p, …);
/**
* Concatenate multiple strings specified in a writev-style vector
* @param p The pool from which to allocate
* @param vec The strings to concatenate
* @param nvec The number of strings to concatenate
* @param nbytes (output) strlen of new string (pass in NULL to omit)
* @return The new string
*/
APR_DECLARE(char *) apr_pstrcatv(apr_pool_t *p, const struct iovec *vec,
apr_size_t nvec, apr_size_t *nbytes);
/**
* printf-style style printing routine. The data is output to a string
* allocated from a pool
* @param p The pool to allocate out of
* @param fmt The format of the string
* @param ap The arguments to use while printing the data
* @return The new string
*/
APR_DECLARE(char *) apr_pvsprintf(apr_pool_t *p, const char *fmt, va_list ap);
/**
* printf-style style printing routine. The data is output to a string
* allocated from a pool
* @param p The pool to allocate out of
* @param fmt The format of the string
* @param … The arguments to use while printing the data
* @return The new string
*/
APR_DECLARE_NONSTD(char *) apr_psprintf(apr_pool_t *p, const char *fmt, …)
__attribute__((format(printf,2,3)));
/**
* Copy up to dst_size characters from src to dst; does not copy
* past a NUL terminator in src, but always terminates dst with a NUL
* regardless.
* @param dst The destination string
* @param src The source string
* @param dst_size The space available in dst; dst always receives
* NUL termination, so if src is longer than
* dst_size, the actual number of characters copied is
* dst_size - 1.
* @return Pointer to the NUL terminator of the destination string, dst
* @remark
*
* Note the differences between this function and strncpy():
* 1) strncpy() doesn’t always NUL terminate; apr_cpystrn() does.
* 2) strncpy() pads the destination string with NULs, which is often
* unnecessary; apr_cpystrn() does not.
* 3) strncpy() returns a pointer to the beginning of the dst string;
* apr_cpystrn() returns a pointer to the NUL terminator of dst,
* to allow a check for truncation.
*
*/
APR_DECLARE(char *) apr_cpystrn(char *dst, const char *src,
apr_size_t dst_size);
/**
* Strip spaces from a string
* @param dest The destination string. It is okay to modify the string
* in place. Namely dest == src
* @param src The string to rid the spaces from.
* @return The destination string, dest.
*/
APR_DECLARE(char *) apr_collapse_spaces(char *dest, const char *src);
/**
* Convert the arguments to a program from one string to an array of
* strings terminated by a NULL pointer
* @param arg_str The arguments to convert
* @param argv_out Output location. This is a pointer to an array of strings.
* @param token_context Pool to use.
*/
APR_DECLARE(apr_status_t) apr_tokenize_to_argv(const char *arg_str,
char ***argv_out,
apr_pool_t *token_context);
/**
* Split a string into separate null-terminated tokens. The tokens are
* delimited in the string by one or more characters from the sep
* argument.
* @param str The string to separate; this should be specified on the
* first call to apr_strtok() for a given string, and NULL
* on subsequent calls.
* @param sep The set of delimiters
* @param last Internal state saved by apr_strtok() between calls.
* @return The next token from the string
*/
APR_DECLARE(char *) apr_strtok(char *str, const char *sep, char **last);
/**
* @defgroup APR_Strings_Snprintf snprintf implementations
* @warning
* These are snprintf implementations based on apr_vformatter().
*
* Note that various standards and implementations disagree on the return
* value of snprintf, and side-effects due to %n in the formatting string.
* apr_snprintf (and apr_vsnprintf) behaves as follows:
*
* Process the format string until the entire string is exhausted, or
* the buffer fills. If the buffer fills then stop processing immediately
* (so no further %n arguments are processed), and return the buffer
* length. In all cases the buffer is NUL terminated. It will return the
* number of characters inserted into the buffer, not including the
* terminating NUL. As a special case, if len is 0, apr_snprintf will
* return the number of characters that would have been inserted if
* the buffer had been infinite (in this case, *buffer can be NULL)
*
* In no event does apr_snprintf return a negative number.
* @{
*/
/**
* snprintf routine based on apr_vformatter. This means it understands the
* same extensions.
* @param buf The buffer to write to
* @param len The size of the buffer
* @param format The format string
* @param … The arguments to use to fill out the format string.
*/
APR_DECLARE_NONSTD(int) apr_snprintf(char *buf, apr_size_t len,
const char *format, …)
__attribute__((format(printf,3,4)));
/**
* vsnprintf routine based on apr_vformatter. This means it understands the
* same extensions.
* @param buf The buffer to write to
* @param len The size of the buffer
* @param format The format string
* @param ap The arguments to use to fill out the format string.
*/
APR_DECLARE(int) apr_vsnprintf(char *buf, apr_size_t len, const char *format,
va_list ap);
/** @} */
/**
* create a string representation of an int, allocated from a pool
* @param p The pool from which to allocate
* @param n The number to format
* @return The string representation of the number
*/
APR_DECLARE(char *) apr_itoa(apr_pool_t *p, int n);
/**
* create a string representation of a long, allocated from a pool
* @param p The pool from which to allocate
* @param n The number to format
* @return The string representation of the number
*/
APR_DECLARE(char *) apr_ltoa(apr_pool_t *p, long n);
/**
* create a string representation of an apr_off_t, allocated from a pool
* @param p The pool from which to allocate
* @param n The number to format
* @return The string representation of the number
*/
APR_DECLARE(char *) apr_off_t_toa(apr_pool_t *p, apr_off_t n);
/**
* Convert a numeric string into an apr_off_t numeric value.
* @param offset The value of the parsed string.
* @param buf The string to parse. It may contain optional whitespace,
* followed by an optional ’+' (positive, default) or ’-' (negative)
* character, followed by an optional ’0x’ prefix if base is 0 or 16,
* followed by numeric digits appropriate for base.
* @param end A pointer to the end of the valid character in buf. If
* not NULL, it is set to the first invalid character in buf.
* @param base A numeric base in the range between 2 and 36 inclusive,
* or 0. If base is zero, buf will be treated as base ten unless its
* digits are prefixed with ’0x’, in which case it will be treated as
* base 16.
*/
APR_DECLARE(apr_status_t) apr_strtoff(apr_off_t *offset, const char *buf,
char **end, int base);
/**
* parse a numeric string into a 64-bit numeric value
* @param buf The string to parse. It may contain optional whitespace,
* followed by an optional ’+' (positive, default) or ’-' (negative)
* character, followed by an optional ’0x’ prefix if base is 0 or 16,
* followed by numeric digits appropriate for base.
* @param end A pointer to the end of the valid character in buf. If
* not NULL, it is set to the first invalid character in buf.
* @param base A numeric base in the range between 2 and 36 inclusive,
* or 0. If base is zero, buf will be treated as base ten unless its
* digits are prefixed with ’0x’, in which case it will be treated as
* base 16.
* @return The numeric value of the string. On overflow, errno is set
* to ERANGE.
*/
APR_DECLARE(apr_int64_t) apr_strtoi64(const char *buf, char **end, int base);
/**
* parse a base-10 numeric string into a 64-bit numeric value.
* Equivalent to apr_strtoi64(buf, (char**)NULL, 10).
* @param buf The string to parse
* @return The numeric value of the string
*/
APR_DECLARE(apr_int64_t) apr_atoi64(const char *buf);
/**
* Format a binary size (magnitiudes are 2^10 rather than 10^3) from an apr_off_t,
* as bytes, K, M, T, etc, to a four character compacted human readable string.
* @param size The size to format
* @param buf The 5 byte text buffer (counting the trailing null)
* @return The buf passed to apr_strfsize()
* @remark All negative sizes report ’ - ’, apr_strfsize only formats positive values.
*/
APR_DECLARE(char *) apr_strfsize(apr_off_t size, char *buf);
|
