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public: crtlib: add safe COM_FileBase implementation

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This commit is contained in:
Alibek Omarov
2023-04-26 04:03:23 +03:00
parent 8f207362a5
commit ac39090f6e
2 changed files with 24 additions and 26 deletions
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48
public/crtlib.c
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@@ -1,6 +1,7 @@
/*
crtlib.c - internal stdlib
Copyright (C) 2011 Uncle Mike
Copyright (c) QuakeSpasm contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -578,40 +579,37 @@ char *Q_pretifymem( float value, int digitsafterdecimal )
COM_FileBase
Extracts the base name of a file (no path, no extension, assumes '/' as path separator)
a1ba: adapted and simplified version from QuakeSpasm
============
*/
void COM_FileBase( const char *in, char *out )
void COM_FileBase( const char *in, char *out, size_t size )
{
int len, start, end;
const char *dot, *slash, *s;
size_t len;
len = Q_strlen( in );
if( !len ) return;
if( unlikely( !COM_CheckString( in ) || size <= 1 ))
{
out[0] = 0;
return;
}
// scan backward for '.'
end = len - 1;
slash = in;
dot = NULL;
for( s = in; *s; s++ )
{
if( *s == '/' || *s == '\\' )
slash = s + 1;
while( end && in[end] != '.' && in[end] != '/' && in[end] != '\\' )
end--;
if( *s == '.' )
dot = s;
}
if( in[end] != '.' )
end = len-1; // no '.', copy to end
else end--; // found ',', copy to left of '.'
if( dot == NULL || dot < slash )
dot = s;
// scan backward for '/'
start = len - 1;
len = Q_min( size - 1, dot - slash );
while( start >= 0 && in[start] != '/' && in[start] != '\\' )
start--;
if( start < 0 || ( in[start] != '/' && in[start] != '\\' ))
start = 0;
else start++;
// length of new sting
len = end - start + 1;
// Copy partial string
Q_strncpy( out, &in[start], len + 1 );
memcpy( out, slash, len );
out[len] = 0;
}