radcli_avp_concat_str(3) Radius client library radcli_avp_concat_str(3)

radcli_avp_concat_str - Concatenate every occurrence of an attribute into a bounded buffer.

#include <radcli/>

int radcli_avp_concat_str(
    char                   *buf,
    size_t                  buflen,
    const radcli_avp_list  *list,
    const radcli_attr_def  *def,
    const char             *sep
);

Generalizes the one convenience legacy radcli.h's rc_aaa() folded into its own call signature (its msg parameter: "will contain the

concatenation of any PW_REPLY_MESSAGE received", lib/buildreq.c) to any attribute, since the pattern walk every occurrence of one attribute in a reply, join as text is not specific to Reply-Message. A caller wanting rc_aaa()'s old convenience no longer needs to hand-roll the radcli_avp_get()-in-a-loop this replaces.

If no occurrence of def is present in list, buf is set to an empty string and 0 is returned this is not a failure, the same way rc_aaa()'s msg started as ' ' and simply stayed that way when no Reply-Message arrived. An attribute whose value contains an embedded NUL byte, or (for a RADCLI_TYPE_TEXT attribute) invalid UTF-8, is skipped (radcli_avp_get_cstr()'s policy), not treated as a failure either.

Follows snprintf()'s buffer-sizing contract exactly: buf may be NULL and/or buflen may be 0 to size a buffer before allocating one (nothing is written in that case), and the return value is always the number of bytes the joined result would occupy, whether or not it fit a return >= buflen means the result was truncated, and buf (if non-NULL and buflen > 0) then holds only a valid NUL-terminated prefix of what fits, never garbage and never unterminated.

destination buffer, or NULL to only compute the needed size; always left NUL-terminated on return (including on truncation, containing whatever fit), whenever buf is non-NULL and buflen > 0.
size of buf, in bytes; may be 0.
the list to search.
the attribute to concatenate occurrences of.
separator inserted between occurrences; NULL or "" for none.

the number of bytes the joined result occupies (excluding the NUL terminator), whether or not it fit in buf or -1 if def is NULL.

radcli_avp_add_bytes(3), radcli_avp_add_bytes_by_num(3), radcli_avp_add_gigawords64(3), radcli_avp_add_gigawords64_by_num(3), radcli_avp_add_ip4(3), radcli_avp_add_ip4_by_num(3), radcli_avp_add_ip4prefix(3), radcli_avp_add_ip4prefix_by_num(3), radcli_avp_add_ip6(3), radcli_avp_add_ip6_by_num(3), radcli_avp_add_str(3), radcli_avp_add_str_by_num(3), radcli_avp_add_uint32(3), radcli_avp_add_uint32_by_num(3), radcli_avp_add_uint64(3), radcli_avp_add_uint64_by_num(3), radcli_avp_add_username(3), radcli_avp_concat_str_by_num(3), radcli_avp_def(3), radcli_avp_get(3), radcli_avp_get_by_num(3), radcli_avp_get_bytes(3), radcli_avp_get_bytes_by_num(3), radcli_avp_get_cstr(3), radcli_avp_get_cstr_by_num(3), radcli_avp_get_gigawords64(3), radcli_avp_get_gigawords64_by_num(3), radcli_avp_get_ip4prefix(3), radcli_avp_get_ip4prefix_by_num(3), radcli_avp_get_ip6(3), radcli_avp_get_ip6_by_num(3), radcli_avp_get_uint32(3), radcli_avp_get_uint32_by_num(3), radcli_avp_get_uint64(3), radcli_avp_get_uint64_by_num(3), radcli_avp_iter_next(3), radcli_avp_list_error(3), radcli_avp_list_free(3), radcli_avp_list_iter(3), radcli_avp_list_new(3)

2026-09-03 radcli