Я новичок в C, и я выполняю некоторые упражнения с Valgrind.Ошибка неинициализированных байтов в Valgrind
Мой код:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int i;
int ints[10];
char myString[50];
for (i=0; i<=10; i++) {
ints[i] = rand() % 10;
}
printf("''string'' is %lu characters long\n", strlen(myString));
strcpy(myString, "This is a medium sized string");
printf("''string'' is %lu characters long\n", strlen(myString));
return 0;
}
Мой выход Valgrind:
==5425== Syscall param write(buf) points to uninitialised byte(s)
==5425== at 0x260E9A: write$NOCANCEL (in /usr/lib/system/libsystem_kernel.dylib)
==5425== by 0x17E5E8: __sflush (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x180CAA: __sfvwrite (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x18B191: __vfprintf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x1AF2DA: __v2printf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x1AF6AF: __xvprintf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x186B29: vfprintf_l (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x18496F: printf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x100000E73: main (test.c:15)
==5425== Address 0x100e is 14 bytes inside a block of size 4,096 alloc'd
==5425== at 0x6DEB: malloc (in /usr/local/Cellar/valgrind/3.9.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==5425== by 0x181855: __smakebuf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x196217: __swsetup (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x1AF158: __v2printf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x1AF6AF: __xvprintf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x186B29: vfprintf_l (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x18496F: printf (in /usr/lib/system/libsystem_c.dylib)
==5425== by 0x100000E73: main (test.c:15)
==5425== Uninitialised value was created by a stack allocation
==5425== at 0x100000DF0: main (test.c:6)
Я имею в виду, что ошибка происходит из-за того, что myString
является «пустой», когда я делаю свой первый printf
звонок , однако я не уверен, как его решить.
Спасибо!
Это сработало, спасибо! – 2014-09-08 03:26:30