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