1 // RUN: %clang_analyze_cc1 -verify %s \
2 // RUN: -analyzer-checker=core,unix.StdCLibraryFunctions \
3 // RUN: -analyzer-config unix.StdCLibraryFunctions:ModelPOSIX=true \
4 // RUN: -analyzer-output=text
5
6 #include "Inputs/std-c-library-functions-POSIX.h"
7 #define NULL ((void *)0)
8
9 char *getenv(const char *);
10 int isalpha(int);
11 int isdigit(int);
12 int islower(int);
13
test_getenv()14 char test_getenv() {
15 char *env = getenv("VAR"); // \
16 // expected-note{{Assuming the environment variable does not exist}} \
17 // expected-note{{'env' initialized here}}
18
19 return env[0]; // \
20 // expected-warning{{Array access (from variable 'env') results in a null pointer dereference}} \
21 // expected-note {{Array access (from variable 'env') results in a null pointer dereference}}
22 }
23
test_isalpha(int * x,char c,char d)24 int test_isalpha(int *x, char c, char d) {
25 int iad = isalpha(d);
26 if (isalpha(c)) {// \
27 // expected-note{{Taking true branch}}
28 x = NULL; // \
29 // expected-note{{Null pointer value stored to 'x'}}
30 }
31
32 return *x; // \
33 // expected-warning{{Dereference of null pointer (loaded from variable 'x')}} \
34 // expected-note {{Dereference of null pointer (loaded from variable 'x')}}
35 }
36
test_isdigit(int * x,char c)37 int test_isdigit(int *x, char c) {
38 if (!isdigit(c)) {// \
39 // expected-note{{Taking true branch}}
40 x = NULL; // \
41 // expected-note{{Null pointer value stored to 'x'}}
42 }
43
44 return *x; // \
45 // expected-warning{{Dereference of null pointer (loaded from variable 'x')}} \
46 // expected-note {{Dereference of null pointer (loaded from variable 'x')}}
47 }
48
test_islower(int * x)49 int test_islower(int *x) {
50 char c = 'c';
51 // No "Assuming..." note. We aren't assuming anything. We *know*.
52 if (islower(c)) { // \
53 // expected-note{{Taking true branch}}
54 x = NULL; // \
55 // expected-note{{Null pointer value stored to 'x'}}
56 }
57
58 return *x; // \
59 // expected-warning{{Dereference of null pointer (loaded from variable 'x')}} \
60 // expected-note {{Dereference of null pointer (loaded from variable 'x')}}
61 }
62
test_bugpath_notes(FILE * f1,char c,FILE * f2)63 int test_bugpath_notes(FILE *f1, char c, FILE *f2) {
64 // This test has the purpose of checking that notes appear at correct place.
65 long a = ftell(f2); // no note
66 if (a == -1) // \
67 // expected-note{{Taking false branch}}
68 return -1;
69 int l = islower(c); // no note
70 a = ftell(f1); // \
71 // expected-note{{Value assigned to 'a'}} \
72 // expected-note{{Assuming that 'ftell' fails}}
73 return dup(a); // \
74 // expected-warning{{The 1st argument to 'dup' is -1 but should be >= 0}} \
75 // expected-note{{The 1st argument to 'dup' is -1 but should be >= 0}}
76 }
77
test_fileno_arg_note(FILE * f1)78 int test_fileno_arg_note(FILE *f1) {
79 return dup(fileno(f1)); // no warning
80 }
81
test_readlink_bufsize_zero(char * Buf,size_t Bufsize)82 int test_readlink_bufsize_zero(char *Buf, size_t Bufsize) {
83 ssize_t Ret = readlink("path", Buf, Bufsize); // \
84 // expected-note{{Assuming that argument 'bufsize' is 0}} \
85 // expected-note{{'Ret' initialized here}}
86 return 1 / Ret; // \
87 // expected-warning{{Division by zero}} \
88 // expected-note{{Division by zero}}
89 }
90