# Ustr - 1.0.4 reference documentation -- constants (60)

## Index of sections Compile switch constants (6) Constants to created fixed/read-only Ustr's (10) Constants to use with parsing numbers: ustr_parse_uintmaxx, etc. (16) Constants to pass to ustr_split* (4) Misc constants to use in code (4) Constants passed to ustr_cntl_opt() (16) Constants passed to ustr_pool_ll_cntl() (4) ## Index of sections, and their contents Compile switch constants USTR_CONF_INCLUDE_CODEONLY_HEADERS USTR_CONF_USE_EOS_MARK USTR_CONF_USE_ASSERT USTR_CONF_COMPILE_USE_ATTRIBUTES USTR_CONF_COMPILE_TYPEDEF USTR_CONF_COMPILE_USE_INLINE Constants to created fixed/read-only Ustr's USTR_BEG_CONST1 USTR_BEG_CONST2 USTR_BEG_CONST4 USTR_BEG_FIXED1 USTR_BEG_FIXED2 USTR_BEG_FIXED4 USTR_BEG_FIXED8 USTR_END_ALOCDx USTR_END_CONSTx USTR_END_FIXEDx Constants to use with parsing numbers: ustr_parse_uintmaxx, etc. USTR_FLAG_PARSE_NUM_DEF USTR_FLAG_PARSE_NUM_SEP USTR_FLAG_PARSE_NUM_OVERFLOW USTR_FLAG_PARSE_NUM_SPACE USTR_FLAG_PARSE_NUM_NO_BEG_ZERO USTR_FLAG_PARSE_NUM_NO_BEG_PM USTR_FLAG_PARSE_NUM_NO_NEGATIVE USTR_FLAG_PARSE_NUM_EXACT USTR_TYPE_PARSE_NUM_ERR_NONE USTR_TYPE_PARSE_NUM_ERR_ONLY_S USTR_TYPE_PARSE_NUM_ERR_ONLY_SPM USTR_TYPE_PARSE_NUM_ERR_ONLY_SPMX USTR_TYPE_PARSE_NUM_ERR_OOB USTR_TYPE_PARSE_NUM_ERR_OVERFLOW USTR_TYPE_PARSE_NUM_ERR_NEGATIVE USTR_TYPE_PARSE_NUM_ERR_BEG_ZERO Constants to pass to ustr_split* USTR_FLAG_SPLIT_DEF USTR_FLAG_SPLIT_RET_SEP USTR_FLAG_SPLIT_RET_NON USTR_FLAG_SPLIT_KEEP_CONFIG Misc constants to use in code USTR_NULL USTR_POOL_NULL USTR_TRUE USTR_FALSE Constants passed to ustr_cntl_opt() USTR_CNTL_OPT_GET_REF_BYTES USTR_CNTL_OPT_SET_REF_BYTES USTR_CNTL_OPT_GET_HAS_SIZE USTR_CNTL_OPT_SET_HAS_SIZE USTR_CNTL_OPT_GET_EXACT_BYTES USTR_CNTL_OPT_SET_EXACT_BYTES USTR_CNTL_OPT_GET_MEM USTR_CNTL_OPT_SET_MEM USTR_CNTL_OPT_GET_MC_M_SCRUB USTR_CNTL_OPT_SET_MC_M_SCRUB USTR_CNTL_OPT_GET_MC_F_SCRUB USTR_CNTL_OPT_SET_MC_F_SCRUB USTR_CNTL_OPT_GET_MC_R_SCRUB USTR_CNTL_OPT_SET_MC_R_SCRUB USTR_CNTL_OPT_GET_FMT USTR_CNTL_OPT_SET_FMT Constants passed to ustr_pool_ll_cntl() USTR_POOL_LL_CNTL_GET_FREE_CMP USTR_POOL_LL_CNTL_SET_FREE_CMP USTR_POOL_LL_CNTL_GET_REALLOC USTR_POOL_LL_CNTL_SET_REALLOC

## Compile switch constants

Constant: USTR_CONF_INCLUDE_CODEONLY_HEADERS
Explanation:
This switch controls whether all the code will be included as inline functions. Having this be non-zero means that you don't have to link against the library.

Constant: USTR_CONF_USE_EOS_MARK
Explanation:
This switch turns on End of String markers, so any bounds overflow will be noticed by ustr_assert_valid().
Note:
Changing this will not do anything useful unless USTR_CONF_INCLUDE_CODEONLY_HEADERS is non-zero.

Constant: USTR_CONF_USE_ASSERT
Explanation:
This switch turns USTR_ASSERT() calls on, so the code within them will be evaluated. Note that there are many calls to ustr_assert_valid() within USTR_ASSERT() macros and that call is relatively expensive.
Note:
Changing this will not do anything useful unless USTR_CONF_INCLUDE_CODEONLY_HEADERS is non-zero.

Constant: USTR_CONF_COMPILE_USE_ATTRIBUTES
Explanation:
This switch controls whether gcc type __attribute__() statements are used in the public headers headers for the library. If the value is 1 then if they are supported by the compiler that built the library they will be used, if the value is 0 they won't be used at all.

Constant: USTR_CONF_COMPILE_TYPEDEF
Explanation:
This switch controls whether typedef will be used for the structs in the public headers for the library. If the value is 1 then they will be used, if the value is 0 they won't be used at all (and your code will have to use struct tags instead -- note all libraries using ustr should compile without this option set).

Constant: USTR_CONF_COMPILE_USE_INLINE
Explanation:
This switch controls whether inline functions will be used in a few cases where the function bodies are very small.
Note:
In some cases this is used so that GCC can eliminate calls to strlen(), for the *_cstr() functions.

## Constants to created fixed/read-only Ustr's

Constant: USTR_BEG_CONST1
Explanation:
This macro is a constant C-style string of the first byte of a constant/read-only Ustr that has a length in the range 0-255.

Constant: USTR_BEG_CONST2
Explanation:
This macro is a constant C-style string of the first byte of a constant/read-only Ustr that has a length in the range 0-65535.

Constant: USTR_BEG_CONST4
Explanation:
This macro is a constant C-style string of the first byte of a constant/read-only Ustr that has a length in the range 0-4294967295.

Constant: USTR_BEG_FIXED1
Explanation:
This macro is a constant C-style string of the first byte of a fixed Ustr that has a length in the range 0-255.

Constant: USTR_BEG_FIXED2
Explanation:
This macro is a constant C-style string of the first byte of a fixed Ustr that has a length in the range 0-65535.

Constant: USTR_BEG_FIXED4
Explanation:
This macro is a constant C-style string of the first byte of a fixed Ustr that has a length in the range 0-4294967295.

Constant: USTR_BEG_FIXED8
Explanation:
This macro is a constant C-style string of the first byte of a fixed Ustr that has a length in the range 0-18446744073709551615.
Note:
This macro is only available if the Ustr code was compiled in a 64bit environment.

Constant: USTR_END_ALOCDx
Explanation:
This macro is a constant C-style string of the last bytes of an allocated Ustr.
Note:
Unless USTR_CONF_USE_EOS_MARK is non-zero, this is just the NIL byte.

Constant: USTR_END_CONSTx
Explanation:
This macro is a constant C-style string of the last bytes of a constant/read-only Ustr.
Note:
Unless USTR_CONF_USE_EOS_MARK is non-zero, this is just the NIL byte.

Constant: USTR_END_FIXEDx
Explanation:
This macro is a constant C-style string of the last bytes of a fixed Ustr.
Note:
Unless USTR_CONF_USE_EOS_MARK is non-zero, this is just the NIL byte.

## Constants to use with parsing numbers: ustr_parse_uintmaxx, etc.

Constant: USTR_FLAG_PARSE_NUM_DEF
Explanation:
Default flags, this is merely 0 but can be used as live documentation.

Constant: USTR_FLAG_PARSE_NUM_SEP
Explanation:
This flag allows the parsing (and ignoring) of the seperator character, at arbitrary pointers in the number, so "1234" and "1_234" would both parse the same (assuming "_" is the seperator).

Constant: USTR_FLAG_PARSE_NUM_OVERFLOW
Explanation:
This flag turns on the overflow checking, in other words without it USTR_TYPE_PARSE_NUM_ERR_OVERFLOW will never be returned as an error code.

Constant: USTR_FLAG_PARSE_NUM_SPACE
Explanation:
This flag allows one or more ' ' (Space) characters before the number or number prefix (Plus Sign, Hyphen).
Note:
Other forms of whitespace don't count, this just affects ' '.

Constant: USTR_FLAG_PARSE_NUM_NO_BEG_ZERO
Explanation:
This flag disallows one or more '0' (Digit Zero) characters before the number.

Constant: USTR_FLAG_PARSE_NUM_NO_BEG_PM
Explanation:
This flag disallows a plus or a minus character before the number.

Constant: USTR_FLAG_PARSE_NUM_NO_NEGATIVE
Explanation:
This flag disallows negative values.

Constant: USTR_FLAG_PARSE_NUM_EXACT
Explanation:
This flag makes the parsing functions return an error if the entire string doesn't contain the number being parsed.

Constant: USTR_TYPE_PARSE_NUM_ERR_NONE
Explanation:
This error code has the value 0, and means that no error occurred parsing the number.

Constant: USTR_TYPE_PARSE_NUM_ERR_ONLY_S
Explanation:
This error code means that the Ustr string consisted only of spaces.

Constant: USTR_TYPE_PARSE_NUM_ERR_ONLY_SPM
Explanation:
This error code means that the Ustr string consisted only spaces, and a plus or minus sign.

Constant: USTR_TYPE_PARSE_NUM_ERR_ONLY_SPMX
Explanation:
This error code means that the Ustr string consisted of only spaces, a plus or minus sign and a "0x" base 16 prefix.

Constant: USTR_TYPE_PARSE_NUM_ERR_OOB
Explanation:
This error code means that the Ustr string had characters in it that where out of bounds from the working base.
Note:
Without the USTR_FLAG_PARSE_NUM_EXACT, this error is ignored as soon as any number is parsed. This out of bounds includes the Ustr string "++" as well as "4A", when parsing in a base less than 11.

Constant: USTR_TYPE_PARSE_NUM_ERR_OVERFLOW
Explanation:
This error code means that the number parsed from the Ustr string would overflow the type it is being parsed into, this is only returned when the USTR_FLAG_PARSE_NUM_OVERFLOW flag was passed to the parse function.

Constant: USTR_TYPE_PARSE_NUM_ERR_NEGATIVE
Explanation:
This error code means that the number parsed from the Vstr string starts with a '-' (Hyphen) character when it is supposed to be an unsigned number.

Constant: USTR_TYPE_PARSE_NUM_ERR_BEG_ZERO
Explanation:
This error code means that the number parsed from the Vstr string starts with a '0' (Digit Zero) character, when the USTR_FLAG_PARSE_NUM_NO_BEG_ZERO flag was passed to the parse function.

## Constants to pass to ustr_split*

Constant: USTR_FLAG_SPLIT_DEF
Explanation:
Default flags, this is merely 0 but can be used as live documentation.

Constant: USTR_FLAG_SPLIT_RET_SEP
Explanation:
Return the separator along with the tokens. For example splitting "a,b," using separator "," will return the tokens "a," and "b," whereas without this flag only "a" and "b" would be returned.

Constant: USTR_FLAG_SPLIT_RET_NON
Explanation:
Return empty tokens. For example: splitting "a,,b" with separator "," will return the tokens {"a" "" "b"}.

Constant: USTR_FLAG_SPLIT_KEEP_CONFIG
Explanation:
Force the returned Ustr's to have same configuration parameters as the Ustr string that is being split.

## Misc constants to use in code

Constant: USTR_NULL
Explanation:
This macro is merely 0 cast to (struct Ustr *), and can be used anywhere NULL would be but "returns" the correct type.

Constant: USTR_POOL_NULL
Explanation:
This macro is merely 0 cast to (struct Ustr_pool *), and can be used anywhere NULL would be but "returns" the correct type.

Constant: USTR_TRUE
Explanation:
This macro is 1, but shows the intent that a boolean value is expected and not a number.

Constant: USTR_FALSE
Explanation:
This macro is 0, but shows the intent that a boolean value is expected and not a number.

## Constants passed to ustr_cntl_opt()

Constant: USTR_CNTL_OPT_GET_REF_BYTES
Parameter[1]: Number of bytes for default reference count in Ustr Type[1]: size_t *
Explanation:
This option will get the default number of bytes used for a reference count when creating Ustr's.

Constant: USTR_CNTL_OPT_SET_REF_BYTES
Parameter[1]: Number of bytes for default reference count in Ustr Type[1]: size_t
Explanation:
This option will set the default number of bytes used for a reference count when creating Ustr's.
Note:
For a single instance, the ustr_dupx_*() functions can be used.

Constant: USTR_CNTL_OPT_GET_HAS_SIZE
Parameter[1]: Default flag for whether to include an explicit size in a Ustr Type[1]: int *
Explanation:
This option will get the default flag for whether to store an explicit size in created Ustr's.

Constant: USTR_CNTL_OPT_SET_HAS_SIZE
Parameter[1]: Default flag for whether to include an explicit size in a Ustr Type[1]: int
Explanation:
This option will set the default flag for whether to store an explicit size in created Ustr's.
Note:
For a single instance, the ustr_dupx_*() functions can be used.

Constant: USTR_CNTL_OPT_GET_EXACT_BYTES
Parameter[1]: Default flag for whether to exactly allocate memory Type[1]: int *
Explanation:
This option will get the default flag for whether to exactly allocate memory when a Ustr needs to be resized.

Constant: USTR_CNTL_OPT_SET_EXACT_BYTES
Parameter[1]: Default flag for whether to exactly allocate memory Type[1]: int
Explanation:
This option will set the default flag for whether to exactly allocate memory when a Ustr needs to be resized.
Note:
For a single instance, the ustr_dupx_*() functions can be used.

Constant: USTR_CNTL_OPT_GET_MEM
Parameter[1]: Pointer to colleciton of function pointers for system allocation Type[1]: struct Ustr_cntl_mem *
Explanation:
This option will get the "system" allocation functions (malloc, realloc, free) for allocated Ustr's.
Note:
As you would expect the default values are: malloc, realloc, free.

Constant: USTR_CNTL_OPT_SET_MEM
Parameter[1]: Pointer to colleciton of function pointers for system allocation Type[1]: const struct Ustr_cntl_mem *
Explanation:
This option will set the "system" allocation functions (malloc, realloc, free) for allocated Ustr's.
Note:
If this option is set after a Ustr has been created, then when freeing or reallocating the existing Ustr the given functions will be used. So they must either be compatible with the default or you must ensure that nothing is allocated before they are set.

Constant: USTR_CNTL_OPT_GET_MC_M_SCRUB
Parameter[1]: Flag for whether to include an explicit size in a Ustr Type[1]: int *
Explanation:
This option will get the flag for whether to "scrub" data allocated via. malloc check.
Note:
Malloc check has to be enabled for this to mean anything, Ie. USTR_CNTL_MALLOC_LVL() must be positive.

Constant: USTR_CNTL_OPT_SET_MC_M_SCRUB
Parameter[1]: Flag for whether to include an explicit size in a Ustr Type[1]: int
Explanation:
This option will set the flag for whether to "scrub" data allocated via. malloc check.
Note:
Malloc check has to be enabled for this to mean anything, Ie. USTR_CNTL_MALLOC_LVL() must be positive.

Constant: USTR_CNTL_OPT_GET_MC_F_SCRUB
Parameter[1]: Flag for whether to include an explicit size in a Ustr Type[1]: int *
Explanation:
This option will get the flag for whether to "scrub" data freed via. malloc check.
Note:
Malloc check has to be enabled for this to mean anything, Ie. USTR_CNTL_MALLOC_LVL() must be positive.

Constant: USTR_CNTL_OPT_SET_MC_F_SCRUB
Parameter[1]: Flag for whether to include an explicit size in a Ustr Type[1]: int
Explanation:
This option will set the flag for whether to "scrub" data freed via. malloc check.
Note:
Malloc check has to be enabled for this to mean anything, Ie. USTR_CNTL_MALLOC_LVL() must be positive.

Constant: USTR_CNTL_OPT_GET_MC_R_SCRUB
Parameter[1]: Flag for whether to include an explicit size in a Ustr Type[1]: int *
Explanation:
This option will get the flag for whether to "scrub" data reallocated via. malloc check. This is done by turning all reallocations into a malloc() and free(), and so is even more costly than normal scrubbing.
Note:
Malloc check has to be enabled for this to mean anything, Ie. USTR_CNTL_MALLOC_LVL() must be positive.

Constant: USTR_CNTL_OPT_SET_MC_R_SCRUB
Parameter[1]: Flag for whether to include an explicit size in a Ustr Type[1]: int
Explanation:
This option will set the flag for whether to "scrub" data reallocated via. malloc check. This is done by turning all reallocations into a malloc() and free(), and so is even more costly than normal scrubbing.
Note:
Malloc check has to be enabled for this to mean anything, Ie. USTR_CNTL_MALLOC_LVL() must be positive.

Constant: USTR_CNTL_OPT_GET_FMT
Parameter[1]: Pointer to colleciton of function pointers for system formating Type[1]: struct Ustr_cntl_fmt *
Explanation:
This option will get the system formatting functions (vsnprintf) for Ustr's. There are two functions, the first is always called and the second is likely called (always with the exact same arguments) if the length passed to the first call was not big enough.
Note:
As you would expect the default values are: vsnprintf and vsnprintf

Constant: USTR_CNTL_OPT_SET_FMT
Parameter[1]: Pointer to colleciton of function pointers for system formatting Type[1]: const struct Ustr_cntl_fmt *
Explanation:
This option will set the system formatting functions (vsnprintf) for Ustr's.

## Constants passed to ustr_pool_ll_cntl()

Constant: USTR_POOL_LL_CNTL_GET_FREE_CMP
Parameter[1]: Number of pointers to compare to in the pool Type[1]: unsigned int *
Explanation:
This option will get the number of comparisons done on a pool free operation.

Constant: USTR_POOL_LL_CNTL_SET_FREE_CMP
Parameter[1]: Number of pointers to compare to in the pool Type[1]: unsigned int
Explanation:
This option will set the number of comparisons done on a pool free operation.
Note:
The default is a small non-zero value, as it's significantly common to have very short lived ustr's ... however this doesn't mean that you can't forget to take references even with pool allocated ustrs.

Constant: USTR_POOL_LL_CNTL_GET_REALLOC
Parameter[1]: Flag for if we should call realloc() Type[1]: int *
Explanation:
This option will get the flag for if we call realloc() to make data bigger, or revert to just allocating anew each time.

Constant: USTR_POOL_LL_CNTL_SET_REALLOC
Parameter[1]: Flag for if we should call realloc() Type[1]: int
Explanation:
This option will set the flag for if we call realloc() to make data bigger, or revert to just allocating anew each time.
Note:
As with USTR_POOL_LL_CNTL_SET_FREE_CMP this option means you can't assume that pool allocated data is never freed until ustr_pool_free() is called, and again it is due to there being significant speed improvements for not making that assumption. Instead of disabling this option, just take areference (which will also make sure the ustr isn't modified behind your back).