https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87823
Bug ID: 87823
Summary: strcpy() has bug ???
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: naka1024512256 at yahoo dot co.jp
Target Milestone: ---
sometimes lose a byte or not collect when copying overlapping area
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//(test.c)
#include <stdio.h>
#include <string.h>
char *p1 = "1234567890123456789012345678901234567890";
char *p2;
char buff[100];
main()
{
test1();
}
test1()
{
p2 = buff;
strcpy(p2, p1);
printf("test (%s) \n", p2);
strcpy(p2, p2+1);
printf("test (%s) \n", p2);
}
-------------------------------------------------------------------------
result: [ubunts 18.04 LTS] gcc 7.3.0
OS: ubuntu 18.04 LTS
Hardware : HP dc7900SFF Core 2 duo E7400
test (1234567890123456789012345678901234567890)
test (234567890123456789012345678901234567900)
-------------------------------------------------------------------------
result: [windows XP] gcc 6.3.0
OS: windows XP
Hardware : HP dc7900SFF Core 2 duo E8500
test (1234567890123456789012345678901234567890)
test (234567890123456789012345678901234567890)
-------------------------------------------------------------------------
