Merge remote-tracking branch 'upstream/master'

1 files changed, 339 insertions, 0 deletions

diff --git a/jam-files/engine/lists.c b/jam-files/engine/lists.c
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+/*
+ * Copyright 1993, 1995 Christopher Seiwald.
+ *
+ * This file is part of Jam - see jam.c for Copyright information.
+ */
+
+# include "jam.h"
+# include "newstr.h"
+# include "lists.h"
+
+/*
+ * lists.c - maintain lists of strings
+ *
+ * This implementation essentially uses a singly linked list, but
+ * guarantees that the head element of every list has a valid pointer
+ * to the tail of the list, so the new elements can efficiently and
+ * properly be appended to the end of a list.
+ *
+ * To avoid massive allocation, list_free() just tacks the whole freed
+ * chain onto freelist and list_new() looks on freelist first for an
+ * available list struct.  list_free() does not free the strings in the
+ * chain: it lazily lets list_new() do so.
+ *
+ * 08/23/94 (seiwald) - new list_append()
+ * 09/07/00 (seiwald) - documented lol_*() functions
+ */
+
+static LIST *freelist = 0;  /* junkpile for list_free() */
+
+/*
+ * list_append() - append a list onto another one, returning total
+ */
+
+LIST * list_append( LIST * l, LIST * nl )
+{
+    if ( !nl )
+    {
+        /* Just return l */
+    }
+    else if ( !l )
+    {
+        l = nl;
+    }
+    else
+    {
+        /* Graft two non-empty lists. */
+        l->tail->next = nl;
+        l->tail = nl->tail;
+    }
+
+    return l;
+}
+
+/*
+ * list_new() - tack a string onto the end of a list of strings
+ */
+
+LIST * list_new( LIST * head, char * string )
+{
+    LIST * l;
+
+    if ( DEBUG_LISTS )
+        printf( "list > %s <\n", string );
+
+    /* Get list struct from freelist, if one available.  */
+    /* Otherwise allocate. */
+    /* If from freelist, must free string first */
+
+    if ( freelist )
+    {
+        l = freelist;
+        freestr( l->string );
+        freelist = freelist->next;
+    }
+    else
+    {
+        l = (LIST *)BJAM_MALLOC( sizeof( LIST ) );
+    }
+
+    /* If first on chain, head points here. */
+    /* If adding to chain, tack us on. */
+    /* Tail must point to this new, last element. */
+
+    if ( !head ) head = l;
+    else head->tail->next = l;
+    head->tail = l;
+    l->next = 0;
+
+    l->string = string;
+
+    return head;
+}
+
+
+/*
+ * list_copy() - copy a whole list of strings (nl) onto end of another (l).
+ */
+
+LIST * list_copy( LIST * l, LIST * nl )
+{
+    for ( ; nl; nl = list_next( nl ) )
+        l = list_new( l, copystr( nl->string ) );
+    return l;
+}
+
+
+/*
+ * list_sublist() - copy a subset of a list of strings.
+ */
+
+LIST * list_sublist( LIST * l, int start, int count )
+{
+    LIST * nl = 0;
+    for ( ; l && start--; l = list_next( l ) );
+    for ( ; l && count--; l = list_next( l ) )
+        nl = list_new( nl, copystr( l->string ) );
+    return nl;
+}
+
+
+static int str_ptr_compare( void const * va, void const * vb )
+{
+    char * a = *( (char * *)va );
+    char * b = *( (char * *)vb );
+    return strcmp(a, b);
+}
+
+
+LIST * list_sort( LIST * l )
+{
+    int len;
+    int ii;
+    char * * strings;
+    LIST * listp;
+    LIST * result = 0;
+
+    if ( !l )
+        return L0;
+
+    len = list_length( l );
+    strings = (char * *)BJAM_MALLOC( len * sizeof(char*) );
+
+    listp = l;
+    for ( ii = 0; ii < len; ++ii )
+    {
+        strings[ ii ] = listp->string;
+        listp = listp->next;
+    }
+
+    qsort( strings, len, sizeof( char * ), str_ptr_compare );
+
+    for ( ii = 0; ii < len; ++ii )
+        result = list_append( result, list_new( 0, strings[ ii ] ) );
+
+    BJAM_FREE( strings );
+
+    return result;
+}
+
+
+/*
+ * list_free() - free a list of strings
+ */
+
+void list_free( LIST * head )
+{
+    /* Just tack onto freelist. */
+    if ( head )
+    {
+        head->tail->next = freelist;
+        freelist = head;
+    }
+}
+
+
+/*
+ * list_pop_front() - remove the front element from a list of strings
+ */
+
+LIST * list_pop_front( LIST * l )
+{
+    LIST * result = l->next;
+    if ( result )
+    {
+        result->tail = l->tail;
+        l->next = L0;
+        l->tail = l;
+    }
+    list_free( l );
+    return result;
+}
+
+
+/*
+ * list_print() - print a list of strings to stdout
+ */
+
+void list_print( LIST * l )
+{
+    LIST * p = 0;
+    for ( ; l; p = l, l = list_next( l ) )
+        if ( p )
+            printf( "%s ", p->string );
+    if ( p )
+        printf( "%s", p->string );
+}
+
+
+/*
+ * list_length() - return the number of items in the list
+ */
+
+int list_length( LIST * l )
+{
+    int n = 0;
+    for ( ; l; l = list_next( l ), ++n );
+    return n;
+}
+
+
+int list_in( LIST * l, char * value )
+{
+    for ( ; l; l = l->next )
+        if ( strcmp( l->string, value ) == 0 )
+            return 1;
+    return 0;
+}
+
+
+LIST * list_unique( LIST * sorted_list )
+{
+    LIST * result = 0;
+    LIST * last_added = 0;
+
+    for ( ; sorted_list; sorted_list = sorted_list->next )
+    {
+        if ( !last_added || strcmp( sorted_list->string, last_added->string ) != 0 )
+        {
+            result = list_new( result, sorted_list->string );
+            last_added = sorted_list;
+        }
+    }
+    return result;
+}
+
+
+/*
+ * lol_init() - initialize a LOL (list of lists).
+ */
+
+void lol_init( LOL * lol )
+{
+    lol->count = 0;
+}
+
+
+/*
+ * lol_add() - append a LIST onto an LOL.
+ */
+
+void lol_add( LOL * lol, LIST * l )
+{
+    if ( lol->count < LOL_MAX )
+        lol->list[ lol->count++ ] = l;
+}
+
+
+/*
+ * lol_free() - free the LOL and its LISTs.
+ */
+
+void lol_free( LOL * lol )
+{
+    int i;
+    for ( i = 0; i < lol->count; ++i )
+        list_free( lol->list[ i ] );
+    lol->count = 0;
+}
+
+
+/*
+ * lol_get() - return one of the LISTs in the LOL.
+ */
+
+LIST * lol_get( LOL * lol, int i )
+{
+    return i < lol->count ? lol->list[ i ] : 0;
+}
+
+
+/*
+ * lol_print() - debug print LISTS separated by ":".
+ */
+
+void lol_print( LOL * lol )
+{
+    int i;
+
+    for ( i = 0; i < lol->count; ++i )
+    {
+        if ( i )
+            printf( " : " );
+        list_print( lol->list[ i ] );
+    }
+}
+
+#ifdef HAVE_PYTHON
+
+PyObject *list_to_python(LIST *l)
+{
+    PyObject *result = PyList_New(0);
+
+    for (; l; l = l->next)
+    {
+        PyObject* s = PyString_FromString(l->string);
+        PyList_Append(result, s);
+        Py_DECREF(s);
+    }
+
+    return result;
+}
+
+LIST *list_from_python(PyObject *l)
+{
+    LIST * result = 0;
+
+    Py_ssize_t i, n;
+    n = PySequence_Size(l);
+    for (i = 0; i < n; ++i)
+    {
+        PyObject *v = PySequence_GetItem(l, i);        
+        result = list_new (result, newstr (PyString_AsString(v)));
+        Py_DECREF(v);
+    }
+
+    return result;
+}
+
+#endif