1COAP_STRING(3)                  libcoap Manual                  COAP_STRING(3)
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NAME

6       coap_string, coap_new_string, coap_delete_string, coap_new_str_const,
7       coap_delete_str_const, coap_new_binary, coap_delete_binary,
8       coap_resize_binary, coap_new_bin_const, coap_delete_bin_const,
9       coap_make_str_const, coap_string_equal, coap_binary_equal - Work with
10       CoAP string functions
11

SYNOPSIS

13       #include <coap3/coap.h>
14
15       coap_string_t *coap_new_string(size_t size);
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17       void coap_delete_string(coap_string_t *string);
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19       coap_str_const_t *coap_new_str_const(const uint8_t *data, size_t size);
20
21       void coap_delete_str_const(coap_str_const_t *string);
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23       coap_str_const_t *coap_make_str_const(const char *string);
24
25       int coap_string_equal(coap_string_t *string1, coap_string_t *string2);
26
27       coap_binary_t *coap_new_binary(size_t size);
28
29       void coap_delete_binary(coap_binary_t *binary);
30
31       coap_binary_t *coap_resize_binary(coap_binary_t *binary, size_t
32       new_size);
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34       coap_bin_const_t *coap_new_bin_const(const uint8_t *data, size_t size);
35
36       void coap_delete_bin_const(coap_bin_const_t *binary);
37
38       int coap_binary_equal(coap_binary_t *binary1, coap_binary_t *binary2);
39
40       For specific (D)TLS library support, link with -lcoap-3-notls,
41       -lcoap-3-gnutls, -lcoap-3-openssl, -lcoap-3-mbedtls or
42       -lcoap-3-tinydtls. Otherwise, link with -lcoap-3 to get the default
43       (D)TLS library support.
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DESCRIPTION

46       There is support for storing strings (usually readable data) and for
47       storing binary data. These are used by a number of functions and
48       provide the information in some of the callbacks.
49
50       There are 4 supported string/binary types as follows
51
52           /*
53            * Coap string data definition
54            */
55           typedef struct coap_string_t {
56             size_t length;    /* length of string */
57             uint8_t *s;       /* string data */
58           } coap_string_t;
59
60           /*
61            * Coap string data definition with const data
62            */
63           typedef struct coap_str_const_t {
64             size_t length;    /* length of string */
65             const uint8_t *s; /* read-only string data */
66           } coap_str_const_t;
67
68           /*
69            * Coap binary data definition
70            */
71           typedef struct coap_binary_t {
72             size_t length;    /* length of binary data */
73             uint8_t *s;       /* binary data */
74           } coap_binary_t;
75
76           /*
77            * Coap binary data definition with const data
78            */
79           typedef struct coap_bin_const_t {
80             size_t length;    /* length of binary data */
81             const uint8_t *s; /* read-only binary data */
82           } coap_bin_const_t;
83
84       The coap_new_string() function allocates a new coap_string_t of size
85       where s points to uninitialized data of length size with an extra
86       trailing NULL at size + 1. length is set to size.
87
88       The coap_delete_string() function is used to delete the coap_string_t
89       created by coap_new_string().
90
91       The coap_new_str_const() function allocates a coap_str_const_t of size
92       where s is filled in with data and has a trailing NULL added. length is
93       set to size. s is read-only.
94
95       The coap_delete_str_const() function is used to delete the
96       coap_str_const_t created by coap_new_str_const().
97
98       The coap_make_str_const() function is used to take some read-only text
99       and uses a static coap_str_const_t for use in different function calls.
100       There are two static entries that are cycled through so that a single
101       function call can call coap_make_str_const() twice.
102
103       The coap_string_equal() function is used to compare two different
104       string objects string1 and string2.
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106       The coap_new_binary() function allocates a new coap_binary_t of size
107       where s points to uninitialized data of length size. length is set to
108       size.
109
110       The coap_resize_binary() function is used resize the size of s to the
111       new size of new_size. The data between the old length and the new_size
112       is unitialized. length is set to new_size.
113
114       The coap_delete_binary() function is used to delete the coap_binary_t
115       created by coap_new_binary().
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117       The coap_new_bin_const() function allocates a coap_bin_const_t of size
118       where s is filled in with in with data and has a trailing NULL added.
119       length is set to size. s is read-only.
120
121       The coap_delete_bin_const() function is used to delete the
122       coap_bin_const_t created by coap_new_bin_const().
123
124       The coap_binary_equal() function is used to compare two different
125       binary objects binary1 and binary2.
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RETURN VALUES

128       The coap_new_string() function returns a pointer to an allocated
129       coap_string_t or NULL if there was a failure.
130
131       The coap_new_str_const() function returns a pointer to an allocated
132       coap_str_const_t or NULL if there was a failure.
133
134       The coap_new_binary() function returns a pointer to an allocated
135       coap_binary_t or NULL if there was a failure.
136
137       The coap_resize_binary() function returns a pointer to an re-allocated
138       coap_binary_t or NULL if there was a failure.
139
140       The coap_new_bin_const() function returns a pointer to an allocated
141       coap_bin_const_t or NULL if there was a failure.
142

SEE ALSO

144       coap_attribute(3), coap_context(3), coap_handler(3), coap_pdu_setup(3)
145       and coap_resource(3)
146

FURTHER INFORMATION

148       "RFC7252: The Constrained Application Protocol (CoAP)"
149

BUGS

151       Please report bugs on the mailing list for libcoap:
152       libcoap-developers@lists.sourceforge.net or raise an issue on GitHub at
153       https://github.com/obgm/libcoap/issues
154

AUTHORS

156       The libcoap project <libcoap-developers@lists.sourceforge.net>
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160coap_string 4.3.1                 11/24/2022                    COAP_STRING(3)
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