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131
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1 #ifndef RANGE_H
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2
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3 /* Definitions of helper functions and macros to create expressions
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4 in a specified range. Not all the symbols declared here are
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5 defined. */
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6
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7 #define SIZE_MAX __SIZE_MAX__
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8 #define DIFF_MAX __PTRDIFF_MAX__
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9 #define DIFF_MIN (-DIFF_MAX - 1)
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10
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11 typedef __INT32_TYPE__ int32_t;
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12 typedef __PTRDIFF_TYPE__ ptrdiff_t;
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13 typedef __SIZE_TYPE__ size_t;
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14
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15 static inline ptrdiff_t signed_value (void)
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16 {
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17 extern volatile ptrdiff_t signed_value_source;
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18 return signed_value_source;
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19 }
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20
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21 static inline size_t unsigned_value (void)
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22 {
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23 extern volatile size_t unsigned_value_source;
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24 return unsigned_value_source;
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25 }
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26
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27 static inline ptrdiff_t signed_range (ptrdiff_t min, ptrdiff_t max)
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28 {
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29 ptrdiff_t val = signed_value ();
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30 return val < min || max < val ? min : val;
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31 }
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32
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33 static inline ptrdiff_t signed_anti_range (ptrdiff_t min, ptrdiff_t max)
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34 {
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35 ptrdiff_t val = signed_value ();
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36 return min <= val && val <= max ? min == DIFF_MIN ? max + 1 : min - 1 : val;
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37 }
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38
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39 static inline size_t unsigned_range (size_t min, size_t max)
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40 {
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41 size_t val = unsigned_value ();
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42 return val < min || max < val ? min : val;
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43 }
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44
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45 static inline size_t unsigned_anti_range (size_t min, size_t max)
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46 {
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47 size_t val = unsigned_value ();
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48 return min <= val && val <= max ? min == 0 ? max + 1 : min - 1 : val;
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49 }
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50
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51 #define SR(min, max) signed_range ((min), (max))
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52 #define UR(min, max) unsigned_range ((min), (max))
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53
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54 #define SAR(min, max) signed_anti_range ((min), (max))
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55 #define UAR(min, max) unsigned_anti_range ((min), (max))
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56
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57 #endif /* RANGE_H */
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