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Implemented strcpy_safe which is safe to use with overlapping src and dst buffers

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Use strcpy_safe in Info_ functions
This commit is contained in:
dreamstalker 2015-06-14 23:08:03 +04:00
parent 34686c3819
commit 3cd4a52567
4 changed files with 81 additions and 73 deletions
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6
rehlds/engine/common.cpp
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@ -33,6 +33,12 @@ char serverinfo[MAX_INFO_STRING];
char gpszVersionString[32]; char gpszVersionString[32];
char gpszProductString[32]; char gpszProductString[32];
char* strcpy_safe(char* dst, char* src) {
int len = strlen(src);
memmove(dst, src, len + 1);
return dst;
}
/* <e875> ../engine/common.c:80 */ /* <e875> ../engine/common.c:80 */
char *Info_Serverinfo(void) char *Info_Serverinfo(void)

3
rehlds/engine/common.h
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@ -170,6 +170,9 @@ NOBODY uint64 Q_strtoull(char *str);
#endif // Q_functions #endif // Q_functions
//strcpy that works correctly with overlapping src and dst buffers
char* strcpy_safe(char* dst, char* src);
int build_number(void); int build_number(void);
char *Info_Serverinfo(void); char *Info_Serverinfo(void);

5
rehlds/engine/info.cpp
View File

@ -30,7 +30,6 @@
// NOTE: This file contains a lot of fixes that are not covered by REHLDS_FIXES define. // NOTE: This file contains a lot of fixes that are not covered by REHLDS_FIXES define.
// TODO: Most of the Info_ functions can be speedup via removing unneded copy of key and values. // TODO: Most of the Info_ functions can be speedup via removing unneded copy of key and values.
// TODO: We have a problem with Q_strcpy, because it maps to strcpy which have undefined behavior when strings overlaps (possibly we need to use memmove solution here)
/* /*
=============== ===============
@ -179,7 +178,7 @@ void Info_RemoveKey(char *s, const char *key)
// Compare keys // Compare keys
if (!Q_strncmp(key, pkey, cmpsize)) if (!Q_strncmp(key, pkey, cmpsize))
{ {
Q_strcpy(start, s); // remove this part strcpy_safe(start, s); // remove this part
s = start; // continue searching s = start; // continue searching
} }
} }
@ -245,7 +244,7 @@ void Info_RemovePrefixedKeys(char *s, const char prefix)
if (pkey[0] == prefix) if (pkey[0] == prefix)
{ {
Q_strcpy(start, s); // remove this part strcpy_safe(start, s); // remove this part
s = start; // continue searching s = start; // continue searching
} }
} }