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// RUN: %clang_analyze_cc1 -verify %s \
// RUN: -analyzer-checker=core,apiModeling \
// RUN: -analyzer-output=text
#define NULL ((void *)0)
char *getenv(const char *);
int isalpha(int);
int isdigit(int);
int islower(int);
char test_getenv() {
char *env = getenv("VAR"); // \
// expected-note{{Assuming the environment variable does not exist}} \
// expected-note{{'env' initialized here}}
return env[0]; // \
// expected-warning{{Array access (from variable 'env') results in a null pointer dereference}} \
// expected-note {{Array access (from variable 'env') results in a null pointer dereference}}
}
int test_isalpha(int *x, char c) {
if (isalpha(c)) {// \
// expected-note{{Assuming the character is alphabetical}} \
// expected-note{{Taking true branch}}
x = NULL; // \
// expected-note{{Null pointer value stored to 'x'}}
}
return *x; // \
// expected-warning{{Dereference of null pointer (loaded from variable 'x')}} \
// expected-note {{Dereference of null pointer (loaded from variable 'x')}}
}
int test_isdigit(int *x, char c) {
if (!isdigit(c)) {// \
// expected-note{{Assuming the character is not a digit}} \
// expected-note{{Taking true branch}}
x = NULL; // \
// expected-note{{Null pointer value stored to 'x'}}
}
return *x; // \
// expected-warning{{Dereference of null pointer (loaded from variable 'x')}} \
// expected-note {{Dereference of null pointer (loaded from variable 'x')}}
}
int test_islower(int *x) {
char c = 'c';
// No "Assuming..." note. We aren't assuming anything. We *know*.
if (islower(c)) { // \
// expected-note{{Taking true branch}}
x = NULL; // \
// expected-note{{Null pointer value stored to 'x'}}
}
return *x; // \
// expected-warning{{Dereference of null pointer (loaded from variable 'x')}} \
// expected-note {{Dereference of null pointer (loaded from variable 'x')}}
}
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