date and time created 91/03/07 20:28:05 by bostic

SCCS-vsn: bin/sh/var.h 5.1

diff --git a/usr/src/bin/sh/var.h b/usr/src/bin/sh/var.h
new file mode 100644 (file)
index 0000000..7979895
--- /dev/null
+++ b/usr/src/bin/sh/var.h
@@ -0,0 +1,101 @@
+/*-
+ * Copyright (c) 1991 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * %sccs.include.redist.c%
+ *
+ *     @(#)var.h       5.1 (Berkeley) %G%
+ */
+
+/*
+ * Shell variables.
+ */
+
+/* flags */
+#define VEXPORT                01      /* variable is exported */
+#define VREADONLY      02      /* variable cannot be modified */
+#define VSTRFIXED      04      /* variable struct is staticly allocated */
+#define VTEXTFIXED     010     /* text is staticly allocated */
+#define VSTACK         020     /* text is allocated on the stack */
+#define VUNSET         040     /* the variable is not set */
+
+
+struct var {
+       struct var *next;               /* next entry in hash list */
+       int flags;              /* flags are defined above */
+       char *text;             /* name=value */
+};
+
+
+struct localvar {
+       struct localvar *next;  /* next local variable in list */
+       struct var *vp;         /* the variable that was made local */
+       int flags;              /* saved flags */
+       char *text;             /* saved text */
+};
+
+
+struct localvar *localvars;
+
+#if ATTY
+extern struct var vatty;
+#endif
+extern struct var vifs;
+extern struct var vmail;
+extern struct var vmpath;
+extern struct var vpath;
+extern struct var vps1;
+extern struct var vps2;
+#if ATTY
+extern struct var vterm;
+#endif
+
+/*
+ * The following macros access the values of the above variables.
+ * They have to skip over the name.  They return the null string
+ * for unset variables.
+ */
+
+#define ifsval()       (vifs.text + 4)
+#define mailval()      (vmail.text + 5)
+#define mpathval()     (vmpath.text + 9)
+#define pathval()      (vpath.text + 5)
+#define ps1val()       (vps1.text + 4)
+#define ps2val()       (vps2.text + 4)
+#if ATTY
+#define termval()      (vterm.text + 5)
+#endif
+
+#if ATTY
+#define attyset()      ((vatty.flags & VUNSET) == 0)
+#endif
+#define mpathset()     ((vmpath.flags & VUNSET) == 0)
+
+
+#ifdef __STDC__
+void initvar();
+void setvar(char *, char *, int);
+void setvareq(char *, int);
+struct strlist;
+void listsetvar(struct strlist *);
+char *lookupvar(char *);
+char *bltinlookup(char *, int);
+char **environment();
+int showvarscmd(int, char **);
+void mklocal(char *);
+void poplocalvars(void);
+#else
+void initvar();
+void setvar();
+void setvareq();
+void listsetvar();
+char *lookupvar();
+char *bltinlookup();
+char **environment();
+int showvarscmd();
+void mklocal();
+void poplocalvars();
+#endif