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faster and safer isprefix

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This commit is contained in:
John Cupitt 2016-02-16 09:56:14 +00:00
parent ef6d8f5979
commit 04dad55e49
1 changed files with 10 additions and 7 deletions
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17
libvips/iofuncs/util.c
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@ -319,21 +319,24 @@ vips_ispostfix( const char *a, const char *b )
return( strcmp( a + m - n, b ) == 0 );
}
/* Test for string a starts string b.
/* Test for string a starts string b. a is a known-good string, b may be
* random data.
*/
gboolean
vips_isprefix( const char *a, const char *b )
{
int n = strlen( a );
int m = strlen( b );
int i;
if( m < n )
return( FALSE );
for( i = 0; i < n; i++ )
for( i = 0; a[i] && b[i]; i++ )
if( a[i] != b[i] )
return( FALSE );
/* If there's stuff left in a but b has finished, we must have a
* mismatch.
*/
if( a[i] && !b[i] )
return( FALSE );
return( TRUE );
}