Imagecraft c compiler and development environment for the atmel avr

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ICCV8 for AVR – C Compiler for Atmel AVRcan be rewritten asint strlen(const char *s){for(i = 0; s[i] != '\0'; i++) {/* do nothing */}return i;}!W (15):[warning] [MISRA 2140]expression of plain `char' type is suspicious inthis contextThe plain char type is the char type specified without the one of the explicit "signed"or "unsigned" type specifiers, like this:char c;MISRA prohibit the use of values of the plain char type, as the signedness of thesevalues depends on the specific compiler used as well as its options as long as theymay control the signedness of that type.Note that declarations that use plain char type are still allowed. For example:signed char s; // OK: not a plain "char"unsigned char u; // OK: not a plain "char"char c;// OK: it's just a declarationchar *str = "Hello"; // OK: another declaration that useplain "char"void f(void){if(str[5] == 0xf5) { // WARNING: "s[5]" is of type plain"char"return;}}if((unsigned char) str[5] == 0xf5) { // OKreturn;}170
ICCV8 for AVR – C Compiler for Atmel AVR!W (6):[warning] [MISRA 2180]numeric constant of type `int' encountered whereconstant of type `unsigned int' expectedMISRA requires numeric constants to have proper types. That means then no numericconstant shall be a subject to a conversion that changes it type; instead, wherepossible, the numeric constant shall be suffixed so it has the suitable type. Forexample:unsigned f(unsigned i){return i + 1; // WARNING: the literal "1" has type "int"whereas// an integer of type "unsigned int" is expected}double g(void){return 1.f; // WARNING: the literal "1.f" has type"float",// but a value of type "double" is expected}unsigned char h(void){return 1; // OK: the literal has type "int" whichdiffers// from the expected type "unsigned char", but// there is no suffix for this type, so the// compiler keeps silence}The following functions are examples of the proper use of the numeric suffixes:unsigned f(unsigned i){return i + 1u; // OK}double g(void){return 1.;}// OK171
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Imagecraft c compiler and development environment for the atmel avr

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