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.TH buffer_get_token_sa_pred 3
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.SH NAME
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buffer_get_token_sa_pred \- read token from buffer
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.SH SYNTAX
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.nf
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.B #include <stralloc.h>
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.B #include <buffer.h>
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int \fBbuffer_get_token_sa_pred\fP(buffer* \fIb\fR,stralloc* \fIsa\fR,
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int (*\fIpredicate\fR)(stralloc* * \fIsa\fR));
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.SH DESCRIPTION
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buffer_get_token_sa_pred appends data from \fIb\fR to \fIsa\fR until
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\fIpredicate\fR(\fIsa\fR) returns 1 or -1.
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If \fIpredicate\fR returns 1 once a '\\n' was read, that new-line
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character is still appended to \fIsa\fR -- use stralloc_chop or
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stralloc_chomp to get rid of it. \fIpredicate\fR can also return 0
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(indicating further input is required to complete the token) or -1
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(abort and return -1; use this if \fIpredicate\fR wants to enfore a
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maximum message size or does timeout handling or detects a malformed
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message).
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If reading from the buffer or allocating memory fails,
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buffer_get_token_sa_pred returns -1 and sets \fIerrno\fR appropriately. At
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that point \fIsa\fR may already contain a partial token.
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On success, buffer_get_token_sa_pred returns 0.
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.SH RATIONALE
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buffer_get_token_sa_pred appends instead of overwriting so it can be
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used on non-blocking sockets (these signal error and set \fIerrno\fR to
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EAGAIN; in this case you can simply call buffer_get_token_sa again when
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\fBselect\fR or \fBpoll\fR indicate more data is available).
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.SH "SEE ALSO"
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buffer_getline_sa(3), buffer_get_token(3), buffer(3)
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