freshlybakedca.ke
Git fork
git-compat-util: introduce more size_t helpers
We will use them in the next commit.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
authored by
Johannes Schindelin
and committed by
Junio C Hamano
e2ffeae3
e9aa762c
+25
git-compat-util.h
+25
git-compat-util.h
···
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#define unsigned_mult_overflows(a, b) \
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((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
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/*
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* Returns true if the left shift of "a" by "shift" bits will
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* overflow. The type of "a" must be unsigned.
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*/
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#define unsigned_left_shift_overflows(a, shift) \
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((shift) < bitsizeof(a) && \
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(a) > maximum_unsigned_value_of_type(a) >> (shift))
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#ifdef __GNUC__
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#define TYPEOF(x) (__typeof__(x))
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#else
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die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
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(uintmax_t)a, (uintmax_t)b);
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return a - b;
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}
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static inline size_t st_left_shift(size_t a, unsigned shift)
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{
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if (unsigned_left_shift_overflows(a, shift))
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die("size_t overflow: %"PRIuMAX" << %u",
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(uintmax_t)a, shift);
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return a << shift;
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}
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static inline unsigned long cast_size_t_to_ulong(size_t a)
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{
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if (a != (unsigned long)a)
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die("object too large to read on this platform: %"
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PRIuMAX" is cut off to %lu",
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(uintmax_t)a, (unsigned long)a);
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return (unsigned long)a;
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}
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#ifdef HAVE_ALLOCA_H