From 4a68a34c50781a4b775c9dc86301db85bca34d79 Mon Sep 17 00:00:00 2001
From: axel <axel@liljencrantz.se>
Date: Wed, 30 Nov 2005 02:52:02 +1000
Subject: [PATCH] Change stupid call signature for tilde expand function

darcs-hash:20051129165202-ac50b-f442d0d75864317cc70059fffe5e8eb956ad54a6.gz
---
 expand.c   | 56 +++++++++++++++++++++++-------------------------------
 wildcard.c | 39 +++++++++++++++++++++++++++++++------
 2 files changed, 57 insertions(+), 38 deletions(-)

diff --git a/expand.c b/expand.c
index 75f1f8080..6c9322f68 100644
--- a/expand.c
+++ b/expand.c
@@ -99,16 +99,21 @@ static int is_clean( const wchar_t *in )
 	
 	const wchar_t * str = in;
 
+	/*
+	  Test characters that have a special meaning in the first character position
+	*/
 	if( wcschr( UNCLEAN_FIRST, *str ) )
 		return 0;
+	
+	/*
+	  Test characters that have a special meaning in any character position
+	*/
 	while( *str )
 	{
 		if( wcschr( UNCLEAN, *str ) )
 			return 0;
 		str++;
 	}
-
-//	debug( 1, L"%ls", in );
 	
 	return 1;
 }
@@ -357,8 +362,6 @@ static int find_process( const wchar_t *proc,
 	wchar_t *result;	
 	
 	job_t *j;
-
-
 	
 	if( iswnumeric(proc) || (wcslen(proc)==0) )
 	{
@@ -1248,20 +1251,19 @@ wchar_t *expand_unescape( const wchar_t * in, int escape_special )
 
 /**
    Attempts tilde expansion. Of the string specified. If tilde
-   expansion is performed, the argument is freed and a new string is
-   allocated in its place. Horrible call signature. Should be
-   altered. Fugly!
+   expansion is performed, the original string is freed and a new
+   string allocated using malloc is returned, otherwise, the original
+   string is returned.
 */
-static int tilde_expand( wchar_t **ptr )
+static wchar_t * expand_tilde_internal( wchar_t *in )
 {
-	wchar_t *in = *ptr;
 	
 	if( in[0] == HOME_DIRECTORY )
 	{
 		int tilde_error = 0;
 		wchar_t *home=0;
-		wchar_t *new_in;
-		wchar_t *old_in;
+		wchar_t *new_in=0;
+		wchar_t *old_in=0;
 		
 //		fwprintf( stderr, L"Tilde expand ~%ls\n", (*ptr)+1 );
 		if( in[1] == '/' || in[1] == '\0' )
@@ -1318,26 +1320,23 @@ static int tilde_expand( wchar_t **ptr )
 			free(name);
 		}
 		
-		if( !tilde_error )
+		if( !tilde_error && home && old_in )
 		{
 			new_in = wcsdupcat( home, old_in ); 
-			free( in );
-			in = new_in;
-			free(home);
-			*ptr = in;
-		}		
-		
+		}
+		free(home);
+		free( in );
+		return new_in;			
 	}
-	return 1;
+	return in;
 } 
 
-wchar_t *expand_tilde(wchar_t *in)
+wchar_t *expand_tilde( wchar_t *in)
 {
 	if( in[0] == L'~' )
 	{
 		in[0] = HOME_DIRECTORY;
-		tilde_expand( &in );
-		return in;
+		return expand_tilde_internal( in );
 	}
 	return in;	
 }
@@ -1351,8 +1350,6 @@ static void remove_internal_separator( const void *s, int conv )
 	wchar_t *in = (wchar_t *)s;
 	wchar_t *out=in;
 
-//	int changed=0;
-
 	while( *in )
 	{
 		switch( *in )
@@ -1376,16 +1373,11 @@ static void remove_internal_separator( const void *s, int conv )
 		}
 	}
 	*out=0;
-/*	if( changed )
-  {
-  fwprintf( stderr, L" -> %ls\n", s );
-  }
-*/
 }
 
 
 /**
-   The real expansion function. All other expansion  functions are wrappers to this one.
+   The real expantion function. expand_one is just a wrapper around this one.
 */
 int expand_string( wchar_t *str,
 				   array_list_t *end_out, 
@@ -1451,7 +1443,7 @@ int expand_string( wchar_t *str,
 									1);
 
 			free( (void *)al_get( in, i ) );
-
+			
 			if( !next )
 				continue;			
 			
@@ -1498,7 +1490,7 @@ int expand_string( wchar_t *str,
 		for( i=0; i<al_get_count( in ); i++ )
 		{
 			wchar_t *next = (wchar_t *)al_get( in, i );		
-			if(!tilde_expand( &next ))
+			if( !(next=expand_tilde_internal( next ) ) )
 			{
 				al_destroy( in );
 				al_destroy( out );
diff --git a/wildcard.c b/wildcard.c
index 5ecdb9165..4d2914585 100644
--- a/wildcard.c
+++ b/wildcard.c
@@ -27,6 +27,12 @@
 #include "reader.h"
 #include "expand.h"
 
+/**
+   The maximum length of a filename token. This is a fallback value,
+   an attempt to find the true value using patchconf is always made. 
+*/
+#define MAX_FILE_LENGTH 1024
+
 int wildcard_has( const wchar_t *str, int internal )
 {
 	wchar_t prev=0;
@@ -312,7 +318,7 @@ int wildcard_expand( const wchar_t *wc,
 					 int flags,
 					 array_list_t *out )
 {
-
+	
 	/* Points to the end of the current wildcard segment */
 	wchar_t *wc_end;
 
@@ -440,10 +446,8 @@ int wildcard_expand( const wchar_t *wc,
 					continue;
 				}
 				
-/*				wprintf( L"Match %ls (%s) against %ls\n\n\n", name, "tjo", wc );*/
 				if( flags & ACCEPT_INCOMPLETE )
 				{
-					/*					wprintf( L"match %ls to %ls\n", name, wc );*/
 					
 					wchar_t *long_name = make_path( base_dir, name );
 
@@ -493,21 +497,44 @@ int wildcard_expand( const wchar_t *wc,
 		  Wilcard segment is not the last segment.
 		  Recursively call wildcard_expand for all matching subdirectories.
 		*/
+
+		
+		/*
+		  wc_str is the part of the wildcarded string from the
+		  beginning to the first slash
+		*/
 		wchar_t *wc_str;
+
+		/*
+		  new_dir is a scratch area containing the full path to a file/directory we are iterating over
+		*/
 		wchar_t *new_dir;
-		static size_t ln=1024;
+
+		/*
+		  The maximum length of a file element
+		*/
+		static size_t ln=MAX_FILE_LENGTH;
 		char * narrow_dir_string = wcs2str( dir_string );
 		
 		if( narrow_dir_string )
 		{
-			ln = pathconf( narrow_dir_string, _PC_NAME_MAX ); /* Find out how long the filename can be in a worst case scenario */
+			/* 
+			   Find out how long the filename can be in a worst case
+			   scenario
+			*/
+			ln = pathconf( narrow_dir_string, _PC_NAME_MAX ); 
+
+			/*
+			  If not specified, use som large number as fallback
+			*/
 			if( ln < 0 )
-				ln = 1024;		
+				ln = MAX_FILE_LENGTH;		
 			free( narrow_dir_string );
 		}
 		new_dir= malloc( sizeof(wchar_t)*(base_len+ln+2)  );
 
 		wc_str = wc_end?wcsndup(wc, wc_end-wc):wcsdup(wc);
+
 		if( (!new_dir) || (!wc_str) )
 		{
 			die_mem();