github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/strlen.c (about)

     1  /* Area:	ffi_call
     2     Purpose:	Check strlen function call.
     3     Limitations:	none.
     4     PR:		none.
     5     Originator:	From the original ffitest.c  */
     6  
     7  /* { dg-do run } */
     8  #include "ffitest.h"
     9  
    10  static size_t ABI_ATTR my_strlen(char *s)
    11  {
    12    return (strlen(s));
    13  }
    14  
    15  int main (void)
    16  {
    17    ffi_cif cif;
    18    ffi_type *args[MAX_ARGS];
    19    void *values[MAX_ARGS];
    20    ffi_arg rint;
    21    char *s;
    22  
    23    args[0] = &ffi_type_pointer;
    24    values[0] = (void*) &s;
    25    
    26    /* Initialize the cif */
    27    CHECK(ffi_prep_cif(&cif, ABI_NUM, 1,
    28  		     &ffi_type_sint, args) == FFI_OK);
    29    
    30    s = "a";
    31    ffi_call(&cif, FFI_FN(my_strlen), &rint, values);
    32    CHECK(rint == 1);
    33    
    34    s = "1234567";
    35    ffi_call(&cif, FFI_FN(my_strlen), &rint, values);
    36    CHECK(rint == 7);
    37    
    38    s = "1234567890123456789012345";
    39    ffi_call(&cif, FFI_FN(my_strlen), &rint, values);
    40    CHECK(rint == 25);
    41    
    42    exit (0);
    43  }
    44