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annotate libcore/core/rbuf.c @ 165:eb3148c1e54d

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core: add state functions
author David Demelier <markand@malikania.fr>
date Mon, 19 Oct 2020 08:10:21 +0200
parents 789b23e01f52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * rbuf.c -- basic utility for reading input buffers
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20
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21 #include "rbuf.h"
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22
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23 void
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24 rbuf_open(struct rbuf *rb, const void *data, size_t datasz)
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25 {
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26 assert(rb);
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27 assert(data);
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28
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29 rb->s = data;
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30 rb->e = rb->s + datasz;
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31 }
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32
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33 bool
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34 rbuf_readline(struct rbuf *rb, char *output, size_t outputsz)
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35 {
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36 assert(rb);
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37 assert(output);
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38 assert(outputsz > 0);
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39
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40 if (rb->s == rb->e)
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41 return false;
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42
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43 for (--outputsz; rb->s != rb->e && *rb->s != '\n' && outputsz; outputsz--)
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44 *output++ = *rb->s++;
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45
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46 /* Not enough space? */
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47 if (!outputsz && rb->s != rb->e && *rb->s != '\n')
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48 return false;
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49
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50 /* Remove this '\n' if still present. */
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51 if (rb->s != rb->e && *rb->s == '\n')
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52 rb->s++;
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53
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54 *output = '\0';
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55
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56 return true;
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57 }