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annotate compat/asprintf.c @ 33:fa93d2ff9c62

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Prevent potential division by zero Add safeguard ensuring that there is at least one possible character to generate passwords from in order to exclude the possibility of a division by zero error in rand_uniform.
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Tue, 30 Jul 2019 20:38:08 +0200
parents a7e41e1a79c8
children
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1 /*
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2 * Copyright (C) 2015 Guido Berhoerster <guido+pwm@berhoerster.name>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be included
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13 * in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include <stdlib.h>
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25 #include <stdio.h>
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26 #include <string.h>
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27 #include <errno.h>
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28
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29 #include "asprintf.h"
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30
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31 int
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32 vasprintf(char **strp, const char *fmt, va_list args)
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33 {
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34 int len;
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35 va_list args_new;
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36 char *str;
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37
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38 *strp = NULL;
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39 va_copy(args_new, args);
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40
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41 len = vsnprintf(NULL, 0, fmt, args);
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42 if (len < 0) {
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43 goto out;
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44 }
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45
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46 str = malloc(len + 1);
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47 if (str == NULL) {
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48 goto out;
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49 }
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50 len = vsnprintf(str, len + 1, fmt, args_new);
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51 if (len < 0) {
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52 free(str);
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53 goto out;
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54 }
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55 *strp = str;
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56 out:
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57 va_end(args_new);
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58
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59 return (len);
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60 }
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61
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62 int
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63 asprintf(char **strp, const char *fmt, ...)
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64 {
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65 int len;
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66 va_list args;
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67
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68 va_start(args, fmt);
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69 len = vasprintf(strp, fmt, args);
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70 va_end(args);
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71
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72 return (len);
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73 }