1 files changed, 180 insertions, 0 deletions
diff --git a/src/cmd/mk/word.c b/src/cmd/mk/word.c
new file mode 100644
index 00000000..ac34c47b
--- /dev/null
+++ b/src/cmd/mk/word.c
@@ -0,0 +1,180 @@
+#include	"mk.h"
+
+static	Word	*nextword(char**);
+
+Word*
+newword(char *s)
+{
+	Word *w;
+
+	w = (Word *)Malloc(sizeof(Word));
+	w->s = strdup(s);
+	w->next = 0;
+	return(w);
+}
+
+Word *
+stow(char *s)
+{
+	Word *head, *w, *new;
+
+	w = head = 0;
+	while(*s){
+		new = nextword(&s);
+		if(new == 0)
+			break;
+		if (w)
+			w->next = new;
+		else
+			head = w = new;
+		while(w->next)
+			w = w->next;
+		
+	}
+	if (!head)
+		head = newword("");
+	return(head);
+}
+
+char *
+wtos(Word *w, int sep)
+{
+	Bufblock *buf;
+	char *cp;
+
+	buf = newbuf();
+	for(; w; w = w->next){
+		for(cp = w->s; *cp; cp++)
+			insert(buf, *cp);
+		if(w->next)
+			insert(buf, sep);
+	}
+	insert(buf, 0);
+	cp = strdup(buf->start);
+	freebuf(buf);
+	return(cp);
+}
+
+Word*
+wdup(Word *w)
+{
+	Word *v, *new, *base;
+
+	v = base = 0;
+	while(w){
+		new = newword(w->s);
+		if(v)
+			v->next = new;
+		else
+			base = new;
+		v = new;
+		w = w->next;
+	}
+	return base;
+}
+
+void
+delword(Word *w)
+{
+	Word *v;
+
+	while(v = w){
+		w = w->next;
+		if(v->s)
+			free(v->s);
+		free(v);
+	}
+}
+
+/*
+ *	break out a word from a string handling quotes, executions,
+ *	and variable expansions.
+ */
+static Word*
+nextword(char **s)
+{
+	Bufblock *b;
+	Word *head, *tail, *w;
+	Rune r;
+	char *cp;
+
+	cp = *s;
+	b = newbuf();
+	head = tail = 0;
+	while(*cp == ' ' || *cp == '\t')		/* leading white space */
+		cp++;
+	while(*cp){
+		cp += chartorune(&r, cp);
+		switch(r)
+		{
+		case ' ':
+		case '\t':
+		case '\n':
+			goto out;
+		case '\\':
+		case '\'':
+		case '"':
+			cp = expandquote(cp, r, b);
+			if(cp == 0){
+				fprint(2, "missing closing quote: %s\n", *s);
+				Exit();
+			}
+			break;
+		case '$':
+			w = varsub(&cp);
+			if(w == 0)
+				break;
+			if(b->current != b->start){
+				bufcpy(b, w->s, strlen(w->s));
+				insert(b, 0);
+				free(w->s);
+				w->s = strdup(b->start);
+				b->current = b->start;
+			}
+			if(head){
+				bufcpy(b, tail->s, strlen(tail->s));
+				bufcpy(b, w->s, strlen(w->s));
+				insert(b, 0);
+				free(tail->s);
+				tail->s = strdup(b->start);
+				tail->next = w->next;
+				free(w->s);
+				free(w);
+				b->current = b->start;
+			} else
+				tail = head = w;
+			while(tail->next)
+				tail = tail->next;
+			break;
+		default:
+			rinsert(b, r);
+			break;
+		}
+	}
+out:
+	*s = cp;
+	if(b->current != b->start){
+		if(head){
+			cp = b->current;
+			bufcpy(b, tail->s, strlen(tail->s));
+			bufcpy(b, b->start, cp-b->start);
+			insert(b, 0);
+			free(tail->s);
+			tail->s = strdup(cp);
+		} else {
+			insert(b, 0);
+			head = newword(b->start);
+		}
+	}
+	freebuf(b);
+	return head;
+}
+
+void
+dumpw(char *s, Word *w)
+{
+	Bprint(&bout, "%s", s);
+	for(; w; w = w->next)
+		Bprint(&bout, " '%s'", w->s);
+	Bputc(&bout, '\n');
+}