Bug Summary

File:rootdir/src/utils/cas/configfile.c
Warning:line 121, column 7
File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name configfile.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/rootdir/src/utils/cas -fcoverage-compilation-dir=/rootdir/src/utils/cas -resource-dir /usr/lib/llvm-19/lib/clang/19 -D HAVE_CONFIG_H -I . -I ../../.. -D USE_WX_EXTENSIONS -D __GD__ -I /usr/include/libpng16 -I /usr/include/freetype2 -I /usr/include/harfbuzz -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/fribidi -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -D AVIF_DLL -I /usr/include/rav1e -I /usr/include/svt-av1 -D EB_DLL -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wno-register -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -analyzer-checker deadcode.DeadStores -analyzer-checker alpha.deadcode.UnreachableCode -analyzer-checker alpha.core.CastSize -analyzer-checker alpha.core.CastToStruct -analyzer-checker alpha.core.IdenticalExpr -analyzer-checker alpha.security.ArrayBoundV2 -analyzer-checker alpha.security.MallocOverflow -analyzer-checker alpha.security.ReturnPtrRange -analyzer-checker alpha.unix.SimpleStream -analyzer-checker alpha.unix.cstring.BufferOverlap -analyzer-checker alpha.unix.cstring.NotNullTerminated -analyzer-checker alpha.unix.cstring.OutOfBounds -analyzer-checker alpha.core.FixedAddr -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /rootdir/html-report/2025-01-14-142724-17216-1 -x c configfile.c
1/*
2 * Name: Config file functions
3 *
4 * Purpose: Read info from casrc ou create one if it doesn't exist
5 *
6 * Author: Pedro de Oliveira <falso@rdk.homeip.net>
7 *
8 * Copyright (c) 2004-2011 Pedro de Oliveira ( falso@rdk.homeip-net )
9 *
10 * This file is part of aMule.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the
24 * Free Software Foundation, Inc.,
25 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
26*/
27
28#include <stdio.h>
29#include <stdlib.h>
30#include <string.h>
31
32#include "configfile.h"
33#include "functions.h"
34
35#define STRINGIFY(x)"x" #x
36#define STRINGIFY_EXPAND(x)"x" STRINGIFY(x)"x"
37
38#define MAX_CONF_ARG_LEN_STR"120" STRINGIFY_EXPAND(MAX_CONF_ARG_LEN)"120"
39
40#define MAX_CONF_KEY_LEN12 12
41#define MAX_CONF_KEY_LEN_STR"12" STRINGIFY_EXPAND(MAX_CONF_KEY_LEN)"12"
42
43int writeconfig(void)
44{
45 FILE *config;
46 char *path;
47 unsigned int i;
48 char *def[] = {
49 "# cas config file\n",
50 "#\n",
51 "# font - full path to a ttf font\n",
52 "# font_size - size the font\n",
53 "# source_image - image where the text will be written\n",
54 "# *_line - x,y,[1/0] enabled or disabled\n\n",
55 "font /usr/share/fonts/corefonts/times.ttf\n",
56 "font_size 10.5\n",
57 "source_image /usr/share/cas/stat.png\n",
58 "first_line 23,17,1\n",
59 "second_line 23,34,1\n",
60 "third_line 23,51,1\n",
61 "fourth_line 23,68,1\n",
62 "fifth_line 23,85,1\n",
63 "sixth_line 23,102,1\n",
64 "seventh_line 23,119,1\n",
65 "template /usr/share/cas/tmp.html\n"
66 "img_type 0\n"
67 };
68
69 path = get_path("casrc");
70 if (path == NULL((void*)0))
71 return 0;
72
73 if ( (config = fopen(path, "w")) == NULL((void*)0))
74 return 0;
75
76 for (i = 0; i < sizeof(def) / sizeof(char *); i++)
77 fprintf(config, "%s", def[i]);
78
79 fclose(config);
80
81 printf("%s created, please edit it and then rerun cas\n", path);
82 free(path);
83
84 return 1;
85}
86
87/* Jacobo221 - [ToDo] There should be a check for corrupt config files! */
88int readconfig(CONF *config)
89{
90 char buffer[120], option[15], *path;
91 FILE *conf;
92 int i;
93 char lines[IMG_TEXTLINES7][13] = {
94 "first_line",
95 "second_line",
96 "third_line",
97 "fourth_line",
98 "fifth_line",
99 "sixth_line",
100 "seventh_line"
101 };
102
103 path = get_path("casrc");
104 if (path == NULL((void*)0)) {
1
Assuming 'path' is not equal to NULL
→
2
←
Taking false branch
→
105 return 0;
106 }
107
108 if ((conf = fopen(path, "r")) == NULL((void*)0)) {
3
←
Taking false branch
→
109 printf("Unable to open %s. Creating it.\n", path);
110 free(path);
111 if (!writeconfig()) {
112 perror("readconfig: unable to create initial config file\n");
113 }
114 return 0;
115 }
116 free(path);
117
118 buffer[0] = 0;
119 while (!feof(conf)) {
4
←
Loop condition is true. Entering loop body
→
7
←
Loop condition is true. Entering loop body
→
120 // Jacobo221 - [ToDo] Only first char per line is comment...
121 if (fgets (buffer,120,conf)) {
5
←
Assuming this stream operation fails
→
6
←
Taking false branch
→
8
←
File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior
122 if (buffer[0] != '#') {
123 /* Only two fields per line */
124 sscanf(buffer, "%" MAX_CONF_KEY_LEN_STR"12" "s %*" MAX_CONF_ARG_LEN_STR"120" "s", option);
125 fflush (stdoutstdout);
126 // Jacobo221 - [ToDo] So lines can't be swapped...
127 if (strcmp(option, "font") == 0) {
128 sscanf(buffer, "%*" MAX_CONF_KEY_LEN_STR"12" "s %" MAX_CONF_ARG_LEN_STR"120" "s", config->font);
129 }
130 if (strcmp(option, "font_size") == 0) {
131 sscanf(buffer, "%*" MAX_CONF_KEY_LEN_STR"12" "s %10f", &config->size);
132 }
133 if (strcmp(option, "source_image") == 0) {
134 sscanf(buffer, "%*" MAX_CONF_KEY_LEN_STR"12" "s %" MAX_CONF_ARG_LEN_STR"120" "s", config->source);
135 }
136 if (strcmp(option, "template") == 0) {
137 sscanf(buffer, "%*" MAX_CONF_KEY_LEN_STR"12" "s %" MAX_CONF_ARG_LEN_STR"120" "s", config->template);
138 }
139 if (strcmp(option, "img_type") == 0) {
140 sscanf(buffer, "%*" MAX_CONF_KEY_LEN_STR"12" "s %1d", &config->img_type);
141 }
142
143 for (i = 0; i < IMG_TEXTLINES7; i++) {
144 if (strcmp(option, lines[i]) == 0) {
145 sscanf(buffer,
146 "%*" MAX_CONF_KEY_LEN_STR"12" "s %4d,%4d,%4d",
147 &config->x[i], &config->y[i],
148 &config->enabled[i]);
149 }
150 }
151 }
152 }
153 }
154
155 fclose(conf);
156
157 return 1;
158}
159