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* avoid over-allocation of brk on first mallocRich Felker2011-04-011-4/+4
| | | | | | | if init_malloc returns positive (successful first init), malloc will retry getting a chunk from the free bins rather than expanding the heap again. also pass init_malloc a hint for the size of the initial allocation.
* rename __simple_malloc.c to lite_malloc.c - yes this affects behavior!Rich Felker2011-03-301-0/+0
| | | | | | | | | | | | | | | why does this affect behavior? well, the linker seems to traverse archive files starting from its current position when resolving symbols. since calloc.c comes alphabetically (and thus in sequence in the archive file) between __simple_malloc.c and malloc.c, attempts to resolve the "malloc" symbol for use by calloc.c were pulling in the full malloc.c implementation rather than the __simple_malloc.c implementation. as of now, lite_malloc.c and malloc.c are adjacent in the archive and in the correct order, so malloc.c should never be used to resolve "malloc" unless it's already needed to resolve another symbol ("free" or "realloc").
* very cheap double-free checks in mallocRich Felker2011-03-231-0/+4
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* global cleanup to use the new syscall interfaceRich Felker2011-03-201-1/+1
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* make malloc(0) return unique pointers rather than NULLRich Felker2011-02-202-6/+10
| | | | | | | this change is made with some reluctance, but i think it's for the best. correct programs must handle either behavior, so there is little advantage to having malloc(0) return NULL. and i managed to actually make the malloc code slightly smaller with this change.
* fix simple_malloc malloc(0) behavior not to return non-unique pointersRich Felker2011-02-201-0/+1
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* fix simple_malloc size restrictionsRich Felker2011-02-201-5/+6
| | | | | | do not allow allocations that overflow ptrdiff_t; fix some overflow checks that were not quite right but didn't matter due to address layout implementation.
* initial check-in, version 0.5.0 v0.5.0Rich Felker2011-02-127-0/+671