forked from OSchip/llvm-project
133 lines
4.7 KiB
C
133 lines
4.7 KiB
C
// RUN: clang-cc -fsyntax-only -verify -Wformat-nonliteral %s
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// Define this to get vasprintf on Linux
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdarg.h>
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char * global_fmt;
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void check_string_literal( FILE* fp, const char* s, char *buf, ... ) {
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char * b;
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va_list ap;
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va_start(ap,buf);
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printf(s); // expected-warning {{format string is not a string literal}}
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vprintf(s,ap); // // no-warning
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fprintf(fp,s); // expected-warning {{format string is not a string literal}}
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vfprintf(fp,s,ap); // no-warning
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asprintf(&b,s); // expected-warning {{format string is not a string lit}}
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vasprintf(&b,s,ap); // no-warning
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sprintf(buf,s); // expected-warning {{format string is not a string literal}}
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snprintf(buf,2,s); // expected-warning {{format string is not a string lit}}
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__builtin___sprintf_chk(buf,0,-1,s); // expected-warning {{format string is not a string literal}}
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__builtin___snprintf_chk(buf,2,0,-1,s); // expected-warning {{format string is not a string lit}}
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vsprintf(buf,s,ap); // no-warning
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vsnprintf(buf,2,s,ap); // no-warning
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vsnprintf(buf,2,global_fmt,ap); // expected-warning {{format string is not a string literal}}
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__builtin___vsnprintf_chk(buf,2,0,-1,s,ap); // no-warning
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__builtin___vsnprintf_chk(buf,2,0,-1,global_fmt,ap); // expected-warning {{format string is not a string literal}}
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// rdar://6079877
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printf("abc"
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"%*d", (unsigned) 1, 1); // expected-warning {{field width should have type 'int'}}
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printf("abc\
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def"
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"%*d", (unsigned) 1, 1); // expected-warning {{field width should have type 'int'}}
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}
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void check_conditional_literal(const char* s, int i) {
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printf(i == 1 ? "yes" : "no"); // no-warning
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printf(i == 0 ? (i == 1 ? "yes" : "no") : "dont know"); // no-warning
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printf(i == 0 ? (i == 1 ? s : "no") : "dont know"); // expected-warning{{format string is not a string literal}}
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}
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void check_writeback_specifier()
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{
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int x;
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char *b;
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printf("%n",&x); // expected-warning {{'%n' in format string discouraged}}
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sprintf(b,"%d%%%n",1, &x); // expected-warning {{'%n' in format string dis}}
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}
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void check_invalid_specifier(FILE* fp, char *buf)
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{
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printf("%s%lb%d","unix",10,20); // expected-warning {{lid conversion '%lb'}}
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fprintf(fp,"%%%l"); // expected-warning {{lid conversion '%l'}}
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sprintf(buf,"%%%%%ld%d%d", 1, 2, 3); // no-warning
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snprintf(buf, 2, "%%%%%ld%;%d", 1, 2, 3); // expected-warning {{sion '%;'}}
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}
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void check_null_char_string(char* b)
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{
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printf("\0this is bogus%d",1); // expected-warning {{string contains '\0'}}
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snprintf(b,10,"%%%%%d\0%d",1,2); // expected-warning {{string contains '\0'}}
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printf("%\0d",1); // expected-warning {{string contains '\0'}}
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}
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void check_empty_format_string(char* buf, ...)
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{
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va_list ap;
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va_start(ap,buf);
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vprintf("",ap); // expected-warning {{format string is empty}}
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sprintf(buf,""); // expected-warning {{format string is empty}}
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}
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void check_wide_string(char* b, ...)
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{
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va_list ap;
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va_start(ap,b);
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printf(L"foo %d",2); // expected-warning {{incompatible pointer types}}, expected-warning {{should not be a wide string}}
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vasprintf(&b,L"bar %d",ap); // expected-warning {{incompatible pointer types}}, expected-warning {{should not be a wide string}}
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}
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void check_asterisk_precision_width(int x) {
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printf("%*d"); // expected-warning {{'*' specified field width is missing a matching 'int' argument}}
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printf("%.*d"); // expected-warning {{'.*' specified field precision is missing a matching 'int' argument}}
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printf("%*d",12,x); // no-warning
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printf("%*d","foo",x); // expected-warning {{field width should have type 'int', but argument has type 'char *'}}
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printf("%.*d","foo",x); // expected-warning {{field precision should have type 'int', but argument has type 'char *'}}
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}
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void __attribute__((format(printf,1,3))) myprintf(const char*, int blah, ...);
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void test_myprintf() {
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myprintf("%d", 17, 18); // okay
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}
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void test_constant_bindings(void) {
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const char * const s1 = "hello";
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const char s2[] = "hello";
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const char *s3 = "hello";
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char * const s4 = "hello";
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extern const char s5[];
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printf(s1); // no-warning
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printf(s2); // no-warning
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printf(s3); // expected-warning{{not a string literal}}
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printf(s4); // expected-warning{{not a string literal}}
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printf(s5); // expected-warning{{not a string literal}}
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}
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// Test what happens when -Wformat-security only.
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#pragma GCC diagnostic ignored "-Wformat-nonliteral"
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#pragma GCC diagnostic warning "-Wformat-security"
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void test9(char *P) {
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int x;
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printf(P); // expected-warning {{format string is not a string literal (potentially insecure)}}
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printf(P, 42);
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printf("%n", &x); // expected-warning {{use of '%n' in format string discouraged }}
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}
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void torture(va_list v8) {
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vprintf ("%*.*d", v8); // no-warning
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}
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