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Driver: now data is shared internally
author David Demelier <markand@malikania.fr>
date Tue, 25 Mar 2014 20:42:11 +0100
parents cedd831d02ff
children 4c9b2a3f2396
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1 /*
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2 * asprintf.c -- basic port of asprintf / vsprintf functions
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3 *
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4 * Copyright (c) 2011, 2012 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 <stdio.h>
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20 #include <stdlib.h>
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21 #include <string.h>
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22 #include <stdarg.h>
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23
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24 #define BASE 80
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25
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26 int
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27 vasprintf(char **res, const char *format, va_list ap)
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28 {
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29 int rvalue, ok;
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30 size_t base = BASE;
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31
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32 if ((*res = malloc(base)) == NULL)
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33 return -1;
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34
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35 ok = 0;
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36 do {
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37 rvalue = vsnprintf(*res, base, format, ap);
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38
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39 if ((signed int)base <= rvalue || rvalue < 0) {
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40 *res = realloc(*res, base + BASE);
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41 base += BASE;
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42 } else
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43 ok = 1;
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44 } while (!ok && *res != NULL);
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45
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46 return rvalue;
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47 }
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48
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49 int
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50 asprintf(char **res, const char *fmt, ...)
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51 {
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52 va_list ap;
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53 int rvalue;
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54
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55 va_start(ap, fmt);
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56 rvalue = vasprintf(res, fmt, ap);
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57 va_end(ap);
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58
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59 return rvalue;
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60 }