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88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*
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* Simple string buffer
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*
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* Copyright (C) 2017 Christian Franke
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*
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* This file is part of FRR.
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*
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* FRR is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* FRR is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with FRR; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef SBUF_H
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#define SBUF_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* sbuf provides a simple string buffer. One application where this comes
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* in handy is the parsing of binary data: If there is an error in the parsing
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* process due to invalid input data, printing an error message explaining what
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* went wrong is definitely useful. However, just printing the actual error,
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* without any information about the previous parsing steps, is usually not very
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* helpful.
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* Using sbuf, the parser can log the whole parsing process into a buffer using
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* a printf like API. When an error ocurrs, all the information about previous
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* parsing steps is there in the log, without any need for backtracking, and can
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* be used to give a detailed and useful error description.
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* When parsing completes successfully without any error, the log can just be
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* discarded unless debugging is turned on, to not spam the log.
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*
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* For the described usecase, the code would look something like this:
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*
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* int sbuf_example(..., char **parser_log)
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* {
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* struct sbuf logbuf;
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*
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* sbuf_init(&logbuf, NULL, 0);
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* sbuf_push(&logbuf, 0, "Starting parser\n");
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*
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* int rv = do_parse(&logbuf, ...);
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*
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* *parser_log = sbuf_buf(&logbuf);
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*
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* return 1;
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* }
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*
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* In this case, sbuf_example uses a string buffer with undefined size, which
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* will
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* be allocated on the heap by sbuf. The caller of sbuf_example is expected to
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* free
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* the string returned in parser_log.
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*/
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struct sbuf {
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bool fixed;
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char *buf;
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size_t size;
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size_t pos;
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int indent;
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};
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void sbuf_init(struct sbuf *dest, char *buf, size_t size);
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void sbuf_reset(struct sbuf *buf);
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const char *sbuf_buf(struct sbuf *buf);
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void sbuf_free(struct sbuf *buf);
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#include "lib/log.h"
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void sbuf_push(struct sbuf *buf, int indent, const char *format, ...)
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PRINTFRR(3, 4);
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#ifdef __cplusplus
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}
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#endif
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#endif
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