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Diffstat (limited to 'cil/test/small1/vararg1.c')
-rw-r--r-- | cil/test/small1/vararg1.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/cil/test/small1/vararg1.c b/cil/test/small1/vararg1.c new file mode 100644 index 00000000..cc710a7b --- /dev/null +++ b/cil/test/small1/vararg1.c @@ -0,0 +1,47 @@ + +/* VA.C: The program below illustrates passing a variable + * number of arguments using the following macros: + * va_start va_arg va_end + * va_list va_dcl (UNIX only) + */ + +#include <stdio.h> +#include <stdarg.h> +int average( int first, ... ); +union vararg_average { + int ints; /* We only pass ints to this one */ +}; + +#include "testharness.h" + +int main( void ) +{ + /* Call with 3 integers (-1 is used as terminator). */ + if(average( 2, 3, 4, -1 ) != 3) E(1); + if(average( 5, 7, 9, 11, 13, -1 ) != 9) E(2); + if(average( -1 ) != 0) E(3); + + SUCCESS; +} + + + +/* Returns the average of a variable list of integers. */ +int average( int first, ... ) +{ + int count = 0, sum = 0, i = first; + va_list marker; + + va_start( marker, first ); /* Initialize variable arguments. */ + while( i != -1 ) + { + sum += i; + count++; + i = va_arg( marker, int); + } + va_end( marker ); /* Reset variable arguments. */ + return( sum ? (sum / count) : 0 ); +} + +// Put this intentionally at the end +#pragma ccuredvararg("average", sizeof(union vararg_average)) |