Bug #48866: mysql.test fails under Fedora 12

strmov() is not guaranteed to work correctly on overlapping
source and destination buffers. On some OSes it may work,
but Fedora 12 has a stpcpy() that's not working correctly 
on overlapping buffers.
Fixed to use the overlap-safe version of strmov instead.
Re-vitalized the overlap-safe version of strmov.

Author: gkodinov

client/mysql.cc

@@ -4108,7 +4108,7 @@ char *get_arg(char *line, my_bool get_next_arg)
     if (*ptr == '\\' && ptr[1]) // escaped character
     {
       // Remove the backslash
-      strmov(ptr, ptr+1);
+      strmov_overlapp(ptr, ptr+1);
     }
     else if ((!quoted && *ptr == ' ') || (quoted && *ptr == qtype))
     {

include/m_string.h

@@ -108,9 +108,7 @@ extern char NEAR _dig_vec_lower[];
 /* Defined in strtod.c */
 extern const double log_10[309];
 
-#ifdef BAD_STRING_COMPILER
-#define strmov(A,B)  (memccpy(A,B,0,INT_MAX)-1)
-#else
+#ifndef strmov
 #define strmov_overlapp(A,B) strmov(A,B)
 #define strmake_overlapp(A,B,C) strmake(A,B,C)
 #endif
@@ -171,12 +169,11 @@ extern	uint strinstr(const char *str,const char *search);
 extern  uint r_strinstr(reg1 my_string str,int from, reg4 my_string search);
 extern	char *strkey(char *dst,char *head,char *tail,char *flags);
 extern	char *strmake(char *dst,const char *src,uint length);
-#ifndef strmake_overlapp
-extern	char *strmake_overlapp(char *dst,const char *src, uint length);
-#endif
 
 #ifndef strmov
 extern	char *strmov(char *dst,const char *src);
+#else
+extern	char *strmov_overlapp(char *dst,const char *src);
 #endif
 extern	char *strnmov(char *dst,const char *src,uint n);
 extern	char *strsuff(const char *src,const char *suffix);

strings/strmov.c

@@ -24,13 +24,11 @@
 #include <my_global.h>
 #include "m_string.h"
 
-#ifdef BAD_STRING_COMPILER
+#ifdef strmov
 #undef strmov
 #define strmov strmov_overlapp
 #endif
 
-#ifndef strmov
-
 #if !defined(MC68000) && !defined(DS90)
 
 char *strmov(register char *dst, register const char *src)
@@ -53,5 +51,3 @@ char *strmov(dst, src)
 }
 
 #endif
-
-#endif /* strmov */