PROP_STRING(3)

PROP_STRING(3) | Library Functions Manual | PROP_STRING(3)

# NAME

`prop_string`, `prop_string_create_copy`, `prop_string_create_format`, `prop_string_create_nocopy`, `prop_string_value`, `prop_string_copy_value`, `prop_string_copy`, `prop_string_size`, `prop_string_equals`, `prop_string_equals_string`, `prop_string_compare`, `prop_string_compare_string` — string value property object

# LIBRARY

Property Container Object Library (libprop, -lprop)

# SYNOPSIS

`#include <prop/proplib.h>`

prop_string_t
`prop_string_create_copy`(const char *cstring);

prop_string_t
`prop_string_create_format`(const char *fmt, ...);

prop_string_t
`prop_string_create_nocopy`(const char *cstring);

prop_string_t
`prop_string_copy`(prop_string_t string);

bool
`prop_string_copy_value`(prop_string_t string, char *buf, size_t buflen);

size_t
`prop_string_size`(prop_string_t string);

const char *
`prop_string_value`(prop_string_t string);

bool
`prop_string_equals`(prop_string_t str1, prop_string_t str2);

bool
`prop_string_equals_string`(prop_string_t string, const char *cstring);

int
`prop_string_compare`(prop_string_t str1, prop_string_t str2);

int
`prop_string_compare_string`(prop_string_t string, const char *cstring);

# DESCRIPTION

The `prop_string` family of functions operate on a string value property object type.

`prop_string_create_copy`(const char *cstring)
  Create a string object that contains a copy of cstring. Returns `NULL` on failure.
`prop_string_create_format`(const char *fmt, ...)
  Similar to `prop_string_create_copy`(), but creates the string using the specified printf(3) format.
`prop_string_create_nocopy`(const char *cstring)
  Similar to `prop_string_create_copy`(), but is allowed to not create an internal copy of the string data, instead referencing the string data passed by the caller. Caution must be exercised because string objects can have an indefinite lifespan. The caller must therefore ensure that the provided string data reference will also be valid indefinitely. This is provided only as a memory optimization; it is not guaranteed that the returned string object will reference the provided string data, and thus callers should not rely on this behavior. Returns `NULL` on failure.
`prop_string_copy`(prop_string_t string)
  Copy a string object. If the string object being copied has an external string buffer reference, then the copy also references the same external string buffer. Returns `NULL` on failure.
`prop_string_size`(prop_string_t string)
  Returns the size of the string, not including the terminating NUL; equivalent semantics to strlen(3). If the supplied object isn't a string, zero is returned.
`prop_string_value`(prop_string_t string)
  Returns a reference to the contents of the string as a C string. If the supplied object isn't a string, `NULL` is returned.
`prop_string_copy_value`(prop_string_t string, void *buf, size_t buflen)
  Copies the contents of the string object including the terminating NUL into the supplied buffer of the specified size. Returns `true` if the copy succeeds and `false` if the supplied buffer is not large enough or if the object is not a string object.
`prop_string_equals`(prop_string_t str1, prop_string_t str2)
  Returns `true` if the two string objects are equivalent.
`prop_string_equals_string`(prop_string_t string, const char *cstring)
  Returns `true` if the string's value is equivalent to cstring.
`prop_string_compare`(prop_string_t str1, prop_string_t str2)
  Compares two strings using strcmp(3) semantics. If either of the two objects are not string objects, an arbitrary non-matching value will be returned.
`prop_string_compare_string`(prop_string_t string, const char *cstring)
  Compares the a string object to the specified C string using strcmp(3) semantics. If either the object is not a string object, an arbitrary non-matching value will be returned.

# SEE ALSO

prop_array(3), prop_bool(3), prop_data(3), prop_dictionary(3), prop_number(3), prop_object(3), proplib(3)

# HISTORY

The proplib(3) property container object library first appeared in NetBSD 4.0. Support for mutable string objects was deprecated in NetBSD 10.0.

June 2, 2020 | NetBSD 11.0