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require "dl/import"
require "dl/struct"
module LIBC
extend DL::Importable
begin
dlload "libc.so.6"
rescue
dlload "libc.so.5"
end
extern "int atoi(char*)"
extern "ibool isdigit(int)"
extern "int gettimeofday(struct timeval *, struct timezone *)"
extern "char* strcat(char*, char*)"
extern "FILE* fopen(char*, char*)"
extern "int fclose(FILE*)"
extern "int fgetc(FILE*)"
extern "int strlen(char*)"
extern "void qsort(void*, int, int, void*)"
def str_qsort(ary, comp)
len = ary.length
r,rs = qsort(ary, len, DL.sizeof('P'), comp)
return rs[0].to_a('S', len)
end
Timeval = struct [
"long tv_sec",
"long tv_usec",
]
Timezone = struct [
"int tz_minuteswest",
"int tz_dsttime",
]
def my_compare(ptr1, ptr2)
ptr1.ptr.to_s <=> ptr2.ptr.to_s
end
COMPARE = callback("int my_compare(char**, char**)")
end
$cb1 = DL.callback('IPP'){|ptr1, ptr2|
str1 = ptr1.ptr.to_s
str2 = ptr2.ptr.to_s
str1 <=> str2
}
p LIBC.atoi("10")
p LIBC.isdigit(?1)
p LIBC.isdigit(?a)
p LIBC.strcat("a", "b")
ary = ["a","c","b"]
ptr = ary.to_ptr
LIBC.qsort(ptr, ary.length, DL.sizeof('P'), LIBC::COMPARE)
p ptr.to_a('S', ary.length)
tv = LIBC::Timeval.malloc
tz = LIBC::Timezone.malloc
LIBC.gettimeofday(tv, tz)
p Time.at(tv.tv_sec)
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