[英]Segfault while using memcmp()
I'm getting segfault in this line: 我在这行中出现段错误:
if(memcmp(datap, 0x38 , 1) == 0)
This is a trace from gdb, you can see datap here: 这是来自gdb的跟踪,您可以在此处查看datap:
Program received signal SIGSEGV, Segmentation fault.
0x00000000004010f1 in processMTMHeader (
datap=0x2aaaab0b001c "1\34\66\63\36\65\34\66.\36\70\34AAAA1.ETR\36\67\64\34U\35\36\61\60\63\34\61\36\62\65\70\34\60\71:00:00\36\62\70\61\34\60\71:00:00\36\64\62\67\34\63\60\60\60\36\65\63\34\63\36\66\63\34\63\36\66\67\34\63\36\70\60\34\63\36\70\61\34\61\60\60\60\36\70\62\34\60\71:00:00\36\70\63\34\61\60\60\60\3Ea", h=0x7fffffffb960,
endmmsgp=0x2aaaab0b0090 "\3Ea") at unzipper.c:91
91 if(memcmp(datap, 0x38 , 1) == 0)
You're using the integer value 0x38
as a pointer, which is very likely not a good idea. 您将整数值
0x38
用作指针,这可能不是一个好主意。
You should probably have: 您可能应该具有:
const uint8_t data[] = { 0x38 };
if(memcmp(datap, data, sizeof data) == 0)
Or, of course, since it's just a single byte: 或者,当然,因为它只是一个字节:
if(((uint8_t *) datap)[0] == 0x38)
UPDATE Assuming that datap
is declared to be unsigned char *datap
, we can drop the cast and just do: 更新假设
datap
被声明为unsigned char *datap
,我们可以删除unsigned char *datap
并执行以下操作:
if(*datap == 0x38)
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