shell_cmds-198.tar.gz

[apple/shell_cmds.git] / sh / var.h

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+/*-
+ * Copyright (c) 1991, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *     @(#)var.h       8.2 (Berkeley) 5/4/95
+ * $FreeBSD$
+ */
+
+/*
+ * Shell variables.
+ */
+
+/* flags */
+#define VEXPORT                0x01    /* variable is exported */
+#define VREADONLY      0x02    /* variable cannot be modified */
+#define VSTRFIXED      0x04    /* variable struct is statically allocated */
+#define VTEXTFIXED     0x08    /* text is statically allocated */
+#define VSTACK         0x10    /* text is allocated on the stack */
+#define VUNSET         0x20    /* the variable is not set */
+#define VNOFUNC                0x40    /* don't call the callback function */
+#define VNOSET         0x80    /* do not set variable - just readonly test */
+#define VNOLOCAL       0x100   /* ignore forcelocal */
+
+
+struct var {
+       struct var *next;               /* next entry in hash list */
+       int flags;                      /* flags are defined above */
+       int name_len;                   /* length of name */
+       char *text;                     /* name=value */
+       void (*func)(const char *);
+                                       /* function to be called when  */
+                                       /* the variable gets set/unset */
+};
+
+
+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 */
+};
+
+
+extern struct localvar *localvars;
+extern int forcelocal;
+
+extern struct var vifs;
+extern struct var vmail;
+extern struct var vmpath;
+extern struct var vpath;
+extern struct var vps1;
+extern struct var vps2;
+extern struct var vps4;
+extern struct var vdisvfork;
+#ifndef NO_HISTORY
+extern struct var vhistsize;
+extern struct var vterm;
+#endif
+
+extern int localeisutf8;
+/* The parser uses the locale that was in effect at startup. */
+extern int initial_localeisutf8;
+
+/*
+ * 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 ifsset()       ((vifs.flags & VUNSET) == 0)
+#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)
+#define ps4val()       (vps4.text + 4)
+#define optindval()    (voptind.text + 7)
+#ifndef NO_HISTORY
+#define histsizeval()  (vhistsize.text + 9)
+#define termval()      (vterm.text + 5)
+#endif
+
+#define mpathset()     ((vmpath.flags & VUNSET) == 0)
+#define disvforkset()  ((vdisvfork.flags & VUNSET) == 0)
+
+void initvar(void);
+void setvar(const char *, const char *, int);
+void setvareq(char *, int);
+struct strlist;
+void listsetvar(struct strlist *, int);
+char *lookupvar(const char *);
+char *bltinlookup(const char *, int);
+void bltinsetlocale(void);
+void bltinunsetlocale(void);
+void updatecharset(void);
+void initcharset(void);
+char **environment(void);
+int showvarscmd(int, char **);
+void mklocal(char *);
+void poplocalvars(void);
+int unsetvar(const char *);
+int setvarsafe(const char *, const char *, int);