BSD 3 development

Work on file usr/src/cmd/csh/sh.hist.c

Synthesized-from: 3bsd

diff --git a/usr/src/cmd/csh/sh.hist.c b/usr/src/cmd/csh/sh.hist.c
new file mode 100644 (file)
index 0000000..f3e40e9
--- /dev/null
+++ b/usr/src/cmd/csh/sh.hist.c
@@ -0,0 +1,93 @@
+/* Copyright (c) 1979 Regents of the University of California */
+#include "sh.h"
+
+/*
+ * C shell
+ */
+
+savehist(sp)
+       struct wordent *sp;
+{
+       register struct Hist *hp, *np;
+       int histlen;
+       register char *cp;
+
+       cp = value("history");
+       if (*cp == 0)
+               histlen = 0;
+       else {
+               while (*cp && digit(*cp))
+                       cp++;
+               /* avoid a looping snafu */
+               if (*cp)
+                       set("history", "10");
+               histlen = getn(value("history"));
+       }
+       /* throw away null lines */
+       if (sp->next->word[0] == '\n')
+               return;
+       for (hp = &Histlist; np = hp->Hnext;)
+               if (eventno - np->Href >= histlen || histlen == 0)
+                       hp->Hnext = np->Hnext, hfree(np);
+               else
+                       hp = np;
+       enthist(++eventno, sp, 1);
+}
+
+struct Hist *
+enthist(event, lp, docopy)
+       int event;
+       register struct wordent *lp;
+       bool docopy;
+{
+       register struct Hist *np;
+
+       np = (struct Hist *) calloc(1, sizeof *np);
+       np->Hnum = np->Href = event;
+       if (docopy)
+               copylex(&np->Hlex, lp);
+       else {
+               np->Hlex.next = lp->next;
+               lp->next->prev = &np->Hlex;
+               np->Hlex.prev = lp->prev;
+               lp->prev->next = &np->Hlex;
+       }
+       np->Hnext = Histlist.Hnext;
+       Histlist.Hnext = np;
+       return (np);
+}
+
+hfree(hp)
+       register struct Hist *hp;
+{
+
+       freelex(&hp->Hlex);
+       xfree(hp);
+}
+
+dohist()
+{
+
+       if (getn(value("history")) == 0)
+               return;
+       dohist1(Histlist.Hnext);
+}
+
+dohist1(hp)
+       register struct Hist *hp;
+{
+
+       if (hp == 0)
+               return;
+       hp->Href++;
+       dohist1(hp->Hnext);
+       phist(hp);
+}
+
+phist(hp)
+       register struct Hist *hp;
+{
+
+       printf("%6d\t", hp->Hnum);
+       prlex(&hp->Hlex);
+}