/**
* mds — A micro-display server
* Copyright © 2014, 2015, 2016, 2017 Mattias Andrée (maandree@kth.se)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MDS_LIBMDSCLIENT_PROTO_UTIL_H
#define MDS_LIBMDSCLIENT_PROTO_UTIL_H
#include <stddef.h>
#include <stdarg.h>
#include <stdint.h>
/**
* Optimisations `libmds_headers_cherrypick` MAY use
*/
typedef enum libmds_cherrypick_optimisation
{
/**
* No optimisation is allowed, in particular this
* means that the array of headers may not be reordered.
* The function may still create a copy of the header
* array and sort the copy.
*
* Cannot be combined with `SORT` or `SORTED`
*
* This option is guaranteed to always have the value 0
*/
DO_NOT_SORT = 0,
/**
* `libmds_headers_cherrypick` is allowed to
* sort the header array. There is no guarantee
* that the header array will be sorted.
*
* Cannot be combined with `DO_NOT_SORT` or `SORTED`
*/
SORT = 1,
/**
* Informs `libmds_headers_cherrypick` that the header
* array already is sorted. `libmds_headers_cherrypick`
* can use this information to optimise its procedure.
* But this also means that the header array will not
* be reordered.
*
* Cannot be combined with `DO_NOT_SORT` or `SORT`
*/
SORTED = 2,
/**
* The list of requested headers is not sorted
* in ascending order
*
* Cannot be combined with `ARGS_SORTED`
*
* This option is guaranteed to always have the value 0
*/
ARGS_UNSORTED = 0,
/**
* The list of requested headers is sorted in
* ascending order
*
* Cannot be combined with `ARGS_UNSORTED`
*/
ARGS_SORTED = 4,
} libmds_cherrypick_optimisation_t;
/**
* Cherrypick headers from a message
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param found Output parameter for the number of found headers of those that
* were requested.
* @param optimisation Optimisations the function may use, only one value please
* @param ... The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return Zero on success, -1 on error, `errno` will have been set
* accordingly on error.
*
* @throws ENOMEM Out of memory. Possibly, the process hit the RLIMIT_AS or
* RLIMIT_DATA limit described in getrlimit(2).
*/
__attribute__((sentinel))
int libmds_headers_cherrypick(char **restrict headers, size_t header_count, size_t *restrict found,
libmds_cherrypick_optimisation_t optimisation, ...);
/**
* Cherrypick headers from a message,
* linear search will be used without optimisations
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param ... The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
__attribute__((sentinel))
size_t libmds_headers_cherrypick_linear_unsorted(char **restrict headers, size_t header_count, ...);
#define libmds_headers_cherrypick_linear_unsorted libmds_headers_cherrypick_linear_unsorted
/**
* Cherrypick headers from a message,
* linear search will be used with optimisation based
* on that the array is sorted as well as the list of
* requested headers (`...`)
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param ... The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
__attribute__((sentinel))
size_t libmds_headers_cherrypick_linear_sorted(char **restrict headers, size_t header_count, ...);
#define libmds_headers_cherrypick_linear_sorted libmds_headers_cherrypick_linear_sorted
/**
* Cherrypick headers from a message,
* binary search will be used
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param ... The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
__attribute__((sentinel))
size_t libmds_headers_cherrypick_binary_unsorted(char **restrict headers, size_t header_count, ...);
#define libmds_headers_cherrypick_binary_unsorted libmds_headers_cherrypick_binary_unsorted
/**
* Cherrypick headers from a message,
* binary search will be used with optimisation based on
* that list of requested headers (`...`) is sorted
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param ... The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
__attribute__((sentinel))
size_t libmds_headers_cherrypick_binary_sorted(char **restrict headers, size_t header_count, ...);
#define libmds_headers_cherrypick_binary_unsorted libmds_headers_cherrypick_binary_unsorted
/**
* Cherrypick headers from a message
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param found Output parameter for the number of found headers of those that
* were requested. `NULL` is permitted.
* @param optimisation Optimisations the function may use
* @param args The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return Zero on success, -1 on error, `errno` will have been set
* accordingly on error.
*
* @throws ENOMEM Out of memory. Possibly, the process hit the RLIMIT_AS or
* RLIMIT_DATA limit described in getrlimit(2).
*/
int libmds_headers_cherrypick_v(char **restrict headers, size_t header_count, size_t *restrict found,
libmds_cherrypick_optimisation_t optimisation, va_list args);
/**
* Cherrypick headers from a message,
* linear search will be used without optimisation
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param args The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
size_t libmds_headers_cherrypick_linear_unsorted_v(char **restrict headers, size_t header_count, va_list args);
#define libmds_headers_cherrypick_linear_unsorted_v libmds_headers_cherrypick_linear_unsorted_v
/**
* Cherrypick headers from a message,
* linear search will be used with optimisation based
* on that the array is sorted as well as the list of
* requested headers (`args`)
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param args The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
size_t libmds_headers_cherrypick_linear_sorted_v(char **restrict headers, size_t header_count, va_list args);
#define libmds_headers_cherrypick_linear_sorted_v libmds_headers_cherrypick_linear_sorted_v
/**
* Cherrypick headers from a message,
* binary search will be used
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param args The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
size_t libmds_headers_cherrypick_binary_unsorted_v(char **restrict headers, size_t header_count, va_list args);
#define libmds_headers_cherrypick_binary_unsorted_v libmds_headers_cherrypick_binary_unsorted_v
/**
* Cherrypick headers from a message,
* binary search will be used with optimisation based on
* that list of requested headers (`args`) is sorted
*
* @param headers The headers in the message
* @param header_count The number of headers
* @param args The first argument should be the name of a header, it should
* have the type `const char*`. The second argument should be
* a pointer to the location where the header named by the first
* argument in the argument list names. It should have the type
* `char**`. If the header is found, its value will be stored,
* and it will be a NUL-terminated string. If the header is not
* found, `NULL` will be stored. The next two arguments is
* interpreted analogously to the first two arguments, and the
* following two in the same way, and so on. When there are no
* more headers in the list, it should be terminated with a `NULL`.
* @return The number of found headers of those that were requested
*/
size_t libmds_headers_cherrypick_binary_sorted_v(char **restrict headers, size_t header_count, va_list args);
#define libmds_headers_cherrypick_binary_sorted_v libmds_headers_cherrypick_binary_sorted_v
/**
* Sort the a header array, this is what `libmds_headers_cherrypick`
* uses to optimise its procedure.
*
* @param headers The array of headers
* @param headr_count The number of elements in `headers`
*/
void libmds_headers_sort(char **restrict headers, size_t header_count);
/**
* Compose a message
*
* @param buffer Pointer to the buffer where the message should be written,
* may point to `NULL` if `buffer_size` points to zero, but the
* pointer itself must not be `NULL`. The buffer may be reallocated.
* Will be updated with the new buffer it is allocated.
* The buffer the pointer points to will be filled with the
* message, however there is no guarantee it will be NUL-terminated.
* @param buffer_size The allocation size of, in `char` `*buffer`, if and only if `buffer`
* points to `NULL`, this point should point to zero, and vice versa.
* Must not be `NULL`. Will be update with the new allocation size.
* It is guaranteed that there will be remove to NUL-terminate
* the message even if it was already NUL-terminate (terminate it
* doubly in that case.)
* @param length Output parameter for the length of the constructed message.
* Must not be `NULL`.
* @param payload The payload that should be added to the message, it should end
* with a LF. `NULL` if the message should not have a payload.
* @param payload_length Pointer to the length of the payload. If `NULL`, `payload`
* must be NUL-terminated, and if it is `NULL` this NUL-termination
* will be used to find the length of the payload. This variable is
* not used if `payload` is `NULL`.
* @param ... The first argument should be a line describing the first header,
* it should be a printf(3)-formatted line that fully describes the
* header line, that is, the header name, colon, blank space and then
* the header's value. No LF should be included. The following
* arguments should be the argument to format the header line.
* If a format for a line begins with a question mark, the remainder
* of the line used, but only if the next argument is non-zero
* (it should be of type `int`,) that argument will not be used
* for the formatting. This may be be iterated any number of this.
* The last argument should be `NULL` to specify that there are no
* more headers. The `Length`-header should not be included, it is
* added automatically. A header may not have a length larger than
* 2¹⁵, otherwise the behaviour of this function is undefined.
* @return Zero on success, -1 on error, `errno` will have been set
* accordingly on error.
*
* @throws ENOMEM Out of memory. Possibly, the process hit the RLIMIT_AS or
* RLIMIT_DATA limit described in getrlimit(2).
*/
__attribute__((nonnull(1, 2, 3), sentinel))
int libmds_compose(char **restrict buffer, size_t *restrict buffer_size, size_t *restrict length,
const char *restrict payload, const size_t *restrict payload_length, ...);
/**
* Compose a message
*
* @param buffer Pointer to the buffer where the message should be written,
* may point to `NULL` if `buffer_size` points to zero, but the
* pointer itself must not be `NULL`. The buffer may be reallocated.
* Will be updated with the new buffer it is allocated.
* The buffer the pointer points to will be filled with the
* message, however there is no guarantee it will be NUL-terminated.
* @param buffer_size The allocation size, in `char` of `*buffer`, if and only if `buffer`
* points to `NULL`, this point should point to zero, and vice versa.
* Must not be `NULL`. Will be update with the new allocation size.
* It is guaranteed that there will be remove to NUL-terminate
* the message even if it was already NUL-terminate (terminate it
* doubly in that case.)
* @param length Output parameter for the length of the constructed message.
* Must not be `NULL`.
* @param payload The payload that should be added to the message, it should end
* with a LF. `NULL` if the message should not have a payload.
* @param payload_length Pointer to the length of the payload. If `NULL`, `payload`
* must be NUL-terminated, and if it is `NULL` this NUL-termination
* will be used to find the length of the payload. This variable is
* not used if `payload` is `NULL`.
* @param args The first argument should be a line describing the first header,
* it should be a printf(3)-formatted line that fully describes the
* header line, that is, the header name, colon, blank space and then
* the header's value. No LF should be included. The following
* arguments should be the argument to format the header line.
* If a format for a line begins with a question mark, the remainder
* of the line used, but only if the next argument is non-zero
* (it should be of type `int`,) that argument will not be used
* for the formatting. This may be be iterated any number of this.
* The last argument should be `NULL` to specify that there are no
* more headers. The `Length`-header should not be included, it is
* added automatically. A header may not have a length larger than
* 2¹⁵, otherwise the behaviour of this function is undefined.
* @return Zero on success, -1 on error, `errno` will have been set
* accordingly on error.
*
* @throws ENOMEM Out of memory. Possibly, the process hit the RLIMIT_AS or
* RLIMIT_DATA limit described in getrlimit(2).
*/
__attribute__((nonnull(1, 2, 3)))
int libmds_compose_v(char **restrict buffer, size_t *restrict buffer_size, size_t *restrict length,
const char *restrict payload, const size_t *restrict payload_length, va_list args);
/**
* Increase the message ID counter
*
* @param message_id Pointer to the current message ID, will be update with
* the next free message ID. Must not be `NULL`.
* @param test Function that tests whether an message ID is free,
* it takes the message ID to test as its first argument,
* and `data` as its second argument, and returns zero if
* it is in used, a positive integer if it is free, and a
* negative integer if an error occurred. `NULL` if there
* should be no testing.
* @param data Argument to pass to `test` so that it can deal with
* threading or any other issues. Unused if `test` is `NULL`.
* @return Zero on success, -1 on error, `errno` will have been set
* accordingly on error.
*
* @throws EAGAIN If there are no free message ID to be used.
* It is advisable to make `test` throw this immediately if
* there are no free message ID:s.
* @throws Any error that `test` may throw.
*/
__attribute__((nonnull(1)))
int libmds_next_message_id(uint32_t *restrict message_id, int (*test)(uint32_t message_id, void *data), void *data);
#endif
