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Diffstat (limited to 'usr/dash/var.h')
| -rw-r--r-- | usr/dash/var.h | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/usr/dash/var.h b/usr/dash/var.h new file mode 100644 index 0000000..1a06a3c --- /dev/null +++ b/usr/dash/var.h @@ -0,0 +1,173 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1997-2005 + * Herbert Xu <herbert@gondor.apana.org.au>. 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. + * 3. 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 + */ + +#include <inttypes.h> + +/* + * 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 VNOSAVE 0x100 /* when text is on the heap before setvareq */ + + +struct var { + struct var *next; /* next entry in hash list */ + int flags; /* flags are defined above */ + const 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 */ + const char *text; /* saved text */ +}; + +struct localvar_list; + + +extern struct localvar *localvars; +extern struct var varinit[]; + +#if ATTY +#define vatty varinit[0] +#define vifs varinit[1] +#else +#define vifs varinit[0] +#endif +#define vmail (&vifs)[1] +#define vmpath (&vmail)[1] +#define vpath (&vmpath)[1] +#define vps1 (&vpath)[1] +#define vps2 (&vps1)[1] +#define vps4 (&vps2)[1] +#define voptind (&vps4)[1] +#ifdef WITH_LINENO +#define vlineno (&voptind)[1] +#endif +#ifndef SMALL +#ifdef WITH_LINENO +#define vterm (&vlineno)[1] +#else +#define vterm (&voptind)[1] +#endif +#define vhistsize (&vterm)[1] +#endif + +#ifdef IFS_BROKEN +extern const char defifsvar[]; +#define defifs (defifsvar + 4) +#else +extern const char defifs[]; +#endif +extern const char defpathvar[]; +#define defpath (defpathvar + 5) + +extern int lineno; +extern char linenovar[]; + +/* + * 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) +#define linenoval() (vlineno.text + 7) +#ifndef SMALL +#define histsizeval() (vhistsize.text + 9) +#define termval() (vterm.text + 5) +#endif + +#if ATTY +#define attyset() ((vatty.flags & VUNSET) == 0) +#endif +#define mpathset() ((vmpath.flags & VUNSET) == 0) + +void initvar(void); +struct var *setvar(const char *name, const char *val, int flags); +intmax_t setvarint(const char *, intmax_t, int); +struct var *setvareq(char *s, int flags); +struct strlist; +void listsetvar(struct strlist *, int); +char *lookupvar(const char *); +intmax_t lookupvarint(const char *); +char **listvars(int, int, char ***); +#define environment() listvars(VEXPORT, VUNSET, 0) +int showvars(const char *, int, int); +int exportcmd(int, char **); +int localcmd(int, char **); +void mklocal(char *); +struct localvar_list *pushlocalvars(void); +void poplocalvars(int); +void unwindlocalvars(struct localvar_list *stop); +int unsetcmd(int, char **); +void unsetvar(const char *); +int varcmp(const char *, const char *); + +static inline int varequal(const char *a, const char *b) { + return !varcmp(a, b); +} + +/* + * Search the environment of a builtin command. + */ + +static inline char *bltinlookup(const char *name) +{ + return lookupvar(name); +} |