src/server/util/writer.c

Fri, 20 Sep 2024 20:04:35 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 20 Sep 2024 20:04:35 +0200
changeset 560
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parent 415
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permissions
-rw-r--r--

fix trace log use after free

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2018 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32
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33 #include "writer.h"
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34
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35 void writer_init(Writer *w, SYS_NETFD fd, char *buf, size_t len) {
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36 w->fd = fd;
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37 w->write = (wr_writefunc)net_write;
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38 w->buffer = buf;
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39 w->size = len;
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40 w->pos = 0;
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41 w->error = 0;
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42 }
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43
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44 void writer_init_with_stream(Writer *w, void *stream, wr_writefunc writefunc, char *buf, size_t len) {
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45 w->fd = stream;
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46 w->write = writefunc;
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47 w->buffer = buf;
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48 w->size = len;
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49 w->pos = 0;
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50 w->error = 0;
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51 }
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52
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53 int writer_flush(Writer *w) {
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54 if(w->error) {
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55 return w->error;
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56 }
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57
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58 size_t pos = 0;
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59 size_t len = w->pos;
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60
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61 while(len > 0) {
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62 //fwrite(w->buffer+pos, 1, len, stdout);
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63 //fflush(stdout);
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64 ssize_t r = w->write(w->fd, w->buffer + pos, len);
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65 if(r <= 0) {
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66 break;
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67 }
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68 len -= r;
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69 pos += r;
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70 }
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71
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72 if(pos != w->pos) {
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73 w->error = 1;
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74 return 1;
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75 }
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76
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77 w->pos = 0;
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78 return 0;
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79 }
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80
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81 int writer_put(Writer *w, const char *s, size_t len) {
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82 if(w->error) {
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83 return w->error;
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84 }
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85
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86 // available bytes
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87 size_t a = w->size - w->pos;
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88 if(a == 0) {
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89 if(writer_flush(w)) {
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90 return 1;
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91 }
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92 }
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93
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94 size_t cplen = len > a ? a : len; // number of bytes we can copy
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95 memcpy(w->buffer+w->pos, s, cplen);
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96 w->pos += cplen;
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97
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98 if(cplen < len) {
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99 // not all bytes copied -> call writer_put again
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100 // the number of available bytes is 0 then, therefore flush is called
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101 return writer_put(w, s + cplen, len - cplen);
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102 } else {
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103 return 0;
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104 }
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105 }
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106
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107 int writer_puts(Writer *w, cxstring s) {
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108 return writer_put(w, s.ptr, s.length);
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109 }
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110
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111 int writer_putc(Writer *w, char c) {
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112 if(w->pos == w->size) {
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113 if(writer_flush(w)) {
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114 return 1;
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115 }
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116 }
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117 w->buffer[w->pos++] = c;
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118 return 0;
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119 }
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120
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121 int writer_fwrite(const void *s, size_t size, size_t nelem, Writer *out) {
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122 int w = writer_put(out, s, size*nelem);
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123 return w/size;
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124 }

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