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libbb: make xrealloc_vector zero out the realloc'ed tail

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function                                             old     new   delta
xrealloc_vector_helper                                51      76     +25
man_main                                             712     705      -7
act                                                  250     234     -16
create_list                                           91      70     -21
getopt_main                                          695     664     -31
load_dep_bb                                          281     248     -33
fileAction                                           744     709     -35
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(add/remove: 0/0 grow/shrink: 1/6 up/down: 25/-143)          Total: -118 bytes
This commit is contained in:
Denis Vlasenko
2008-08-04 13:20:36 +00:00
parent 2b576b8e76
commit 27842288b3
9 changed files with 30 additions and 20 deletions
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4
include/libbb.h
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@@ -570,6 +570,10 @@ void *malloc_or_warn(size_t size) FAST_FUNC;
void *xmalloc(size_t size) FAST_FUNC;
void *xzalloc(size_t size) FAST_FUNC;
void *xrealloc(void *old, size_t size) FAST_FUNC;
/* After xrealloc_vector(v, 4, idx) it's ok to use
* at least v[idx] and v[idx+1], for all idx values.
* shift specifies how many new elements are added (1: 2, 2: 4... 8: 256...)
* when all elements are used up. New elements are zeroed out. */
#define xrealloc_vector(vector, shift, idx) \
xrealloc_vector_helper((vector), (sizeof((vector)[0]) << 8) + (shift), (idx))
void* xrealloc_vector_helper(void *vector, unsigned sizeof_and_shift, int idx) FAST_FUNC;