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diff --git a/src/pdclib/testing/_PDCLIB_iotest.h b/src/pdclib/testing/_PDCLIB_iotest.h
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+/* PDCLib testing suite <_PDCLIB_test.h>
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+/* -------------------------------------------------------------------------- */
+/* Helper macros for printf() / scanf() tests */
+/* -------------------------------------------------------------------------- */
+/* Tucked away in a seperate header because these are ugly, complex, and not */
+/* needed in 95% of all test cases. */
+/* -------------------------------------------------------------------------- */
+
+/* ...printf() tests */
+#if defined( _PDCLIB_FILEIO )
+ #define GET_RESULT \
+ rewind( target ); \
+ if ( (int)fread( result_buffer, 1, actual_rc, target ) != actual_rc ) \
+ { \
+ fprintf( stderr, "GET_RESULT failed." ); \
+ }
+ #define RESULT_MISMATCH( act, exp ) strcmp( result_buffer, exp ) != 0
+ #define RESULT_STRING( tgt ) result_buffer
+#elif defined( _PDCLIB_STRINGIO )
+ #define RESULT_MISMATCH( act, exp ) strcmp( act, exp ) != 0
+ #define GET_RESULT
+ #define RESULT_STRING( tgt ) tgt
+#endif
+
+#ifdef _PDCLIB_FILEIO
+#define PREP_RESULT_BUFFER char result_buffer[100] = { 0 }; rewind( target );
+#else
+#define PREP_RESULT_BUFFER
+#endif
+
+#define GETFMT( fmt, ... ) (fmt)
+#define PRINTF_TEST( expected_rc, expected_string, ... ) do { \
+ int actual_rc; \
+ PREP_RESULT_BUFFER \
+ actual_rc = testprintf( target, __VA_ARGS__ ); \
+ GET_RESULT \
+ if ( ( actual_rc != expected_rc ) || \
+ ( RESULT_MISMATCH( target, expected_string ) ) ) \
+ { \
+ ++TEST_RESULTS; \
+ fprintf( stderr, \
+ "FAILED: " __FILE__ " (" _PDCLIB_FILEID "), line %d\n" \
+ " format string \"%s\"\n" \
+ " expected %2d, \"%s\"\n" \
+ " actual %2d, \"%s\"\n", \
+ __LINE__, GETFMT(__VA_ARGS__, 0), expected_rc, \
+ expected_string, actual_rc, RESULT_STRING( target ) ); \
+ } \
+ } while ( 0 )
+
+/* ...scanf() tests */
+#if defined( _PDCLIB_FILEIO )
+ #define PREPARE_SOURCE( input_string ) \
+ rewind( source ); \
+ fwrite( input_string, 1, sizeof( input_string ), source ); \
+ rewind( source );
+#elif defined( _PDCLIB_STRINGIO )
+ #define PREPARE_SOURCE( input_string ) \
+ memcpy( source, input_string, sizeof( input_string ) );
+#endif
+
+#define SCANF_TEST( expected_rc, input_string, ... ) do { \
+ int actual_rc; \
+ PREPARE_SOURCE( input_string ); \
+ actual_rc = testscanf( source, __VA_ARGS__ ); \
+ if ( actual_rc != expected_rc ) \
+ { \
+ ++TEST_RESULTS; \
+ fprintf( stderr, "FAILED: " __FILE__ " (" _PDCLIB_FILEID "), line %d\n expected %2d, actual %2d\n", __LINE__, expected_rc, actual_rc ); \
+ } \
+ } while ( 0 )
+
+/* Virtually everything in the printf() / scanf() test drivers is heavily
+ depending on the platform, i.e. the width of the integer values. To do
+ proper domain tests, we need the limits of the integers (largest and
+ smallest value), which we can get from <limits.h>. But we also need the
+ string representations of these numbers, to the various bases, which of
+ course vary depending on how the platform defines 'int' and 'long'.
+*/
+
+#define sym2v( x ) #x
+#define sym2s( x ) sym2v( x )
+
+#if INT_MAX >> 15 == 1
+
+#define UINT_DIG 5
+#define INT_DIG 5
+#define INT_DIG_LESS1 "4"
+#define INT_DIG_PLUS1 "6"
+#define INT_DIG_PLUS2 "7"
+#define INT_HEXDIG "FFF"
+#define INT_hexdig "fff"
+#define INT_OCTDIG "177777"
+#define INT_MAX_DEZ_STR "32767"
+#define INT_MIN_DEZ_STR "32768"
+#define UINT_MAX_DEZ_STR "65535"
+#define INT_MAX_OCT_STR
+#define INT_MIN_OCT_STR
+#define UINT_MAX_OCT_STR
+#define INT_MAX_HEX_STR
+#define INT_MIN_HEX_STR
+#define UINT_MAX_HEX_STR
+
+#elif UINT_MAX >> 31 == 1
+
+#define UINT_DIG 10
+#define INT_DIG 10
+#define INT_DIG_LESS1 "9"
+#define INT_DIG_PLUS1 "11"
+#define INT_DIG_PLUS2 "12"
+#define INT_HEXDIG "FFFFFFF"
+#define INT_hexdig "fffffff"
+#define INT_OCTDIG "37777777777"
+#define INT_MAX_DEZ_STR "2147483647"
+#define INT_MIN_DEZ_STR "2147483648"
+#define UINT_MAX_DEZ_STR "4294967295"
+#define INT_MAX_OCT_STR
+#define INT_MIN_OCT_STR
+#define UINT_MAX_OCT_STR
+#define INT_MAX_HEX_STR
+#define INT_MIN_HEX_STR
+#define UINT_MAX_HEX_STR
+
+#elif UINT_MAX >> 63 == 1
+
+#define UINT_DIG 20
+#define INT_DIG 19
+#define INT_DIG_LESS1 "18"
+#define INT_DIG_PLUS1 "20"
+#define INT_DIG_PLUS2 "21"
+#define INT_HEXDIG "FFFFFFFFFFFFFFF"
+#define INT_hexdig "fffffffffffffff"
+#define INT_OCTDIG "1777777777777777777777"
+#define INT_MAX_DEZ_STR "9223372036854775807"
+#define INT_MIN_DEZ_STR "9223372036854775808"
+#define UINT_MAX_DEZ_STR "18446744073709551615"
+#define INT_MAX_OCT_STR
+#define INT_MIN_OCT_STR
+#define UINT_MAX_OCT_STR
+#define INT_MAX_HEX_STR
+#define INT_MIN_HEX_STR
+#define UINT_MAX_HEX_STR
+
+#else
+
+#error Unsupported width of 'int' (neither 16, 32, nor 64 bit).
+
+#endif
+
+
+#if ULONG_MAX >> 31 == 1
+
+#define ULONG_DIG 10
+#define LONG_DIG 10
+#define LONG_MAX_DEZ_STR "2147483647"
+#define LONG_MIN_DEZ_STR "2147483648"
+#define ULONG_MAX_DEZ_STR "4294967295"
+#define LONG_MAX_OCT_STR
+#define LONG_MIN_OCT_STR
+#define ULONG_MAX_OCT_STR
+#define LONG_MAX_HEX_STR
+#define LONG_MIN_HEX_STR
+#define ULONG_MAX_HEX_STR
+
+#elif ULONG_MAX >> 63 == 1
+
+#define ULONG_DIG 20
+#define LONG_DIG 19
+#define LONG_MAX_DEZ_STR "9223372036854775807"
+#define LONG_MIN_DEZ_STR "9223372036854775808"
+#define ULONG_MAX_DEZ_STR "18446744073709551615"
+#define LONG_MAX_OCT_STR
+#define LONG_MIN_OCT_STR
+#define ULONG_MAX_OCT_STR
+#define LONG_MAX_HEX_STR
+#define LONG_MIN_HEX_STR
+#define ULONG_MAX_HEX_STR
+
+#else
+
+#error Unsupported width of 'long' (neither 32 nor 64 bit).
+
+#endif
+
+
+#if ULLONG_MAX >> 63 == 1
+
+#define ULLONG_DIG 20
+#define LLONG_DIG 19
+#define LLONG_MAX_DEZ_STR "9223372036854775807"
+#define LLONG_MIN_DEZ_STR "9223372036854775808"
+#define ULLONG_MAX_DEZ_STR "18446744073709551615"
+#define LLONG_MAX_OCT_STR
+#define LLONG_MIN_OCT_STR
+#define ULLONG_MAX_OCT_STR
+#define LLONG_MAX_HEX_STR
+#define LLONG_MIN_HEX_STR
+#define ULLONG_MAX_HEX_STR
+
+#elif ULLONG_MAX >> 127 == 1
+
+#define ULLONG_DIG 38
+#define LLONG_DIG 38
+#define LLONG_MAX_DEZ_STR "170141183460469231731687303715884105727"
+#define LLONG_MIN_DEZ_STR "170141183460469231731687303715884105728"
+#define ULLONG_MAX_DEZ_STR "340282366920938463463374607431768211455"
+#define LLONG_MAX_OCT_STR
+#define LLONG_MIN_OCT_STR
+#define ULLONG_MAX_OCT_STR
+#define LLONG_MAX_HEX_STR
+#define LLONG_MIN_HEX_STR
+#define ULLONG_MAX_HEX_STR
+
+#else
+
+#error Unsupported width of 'long long' (neither 64 nor 128 bit).
+
+#endif