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  1. /*  $NetBSD: var.h,v 1.18 2000/05/22 10:18:47 elric Exp $   */
  2.  
  3. /*-
  4.  * Copyright (c) 1991, 1993
  5.  *  The Regents of the University of California.  All rights reserved.
  6.  *
  7.  * This code is derived from software contributed to Berkeley by
  8.  * Kenneth Almquist.
  9.  *
  10.  * Redistribution and use in source and binary forms, with or without
  11.  * modification, are permitted provided that the following conditions
  12.  * are met:
  13.  * 1. Redistributions of source code must retain the above copyright
  14.  *    notice, this list of conditions and the following disclaimer.
  15.  * 2. Redistributions in binary form must reproduce the above copyright
  16.  *    notice, this list of conditions and the following disclaimer in the
  17.  *    documentation and/or other materials provided with the distribution.
  18.  * 3. All advertising materials mentioning features or use of this software
  19.  *    must display the following acknowledgement:
  20.  *  This product includes software developed by the University of
  21.  *  California, Berkeley and its contributors.
  22.  * 4. Neither the name of the University nor the names of its contributors
  23.  *    may be used to endorse or promote products derived from this software
  24.  *    without specific prior written permission.
  25.  *
  26.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36.  * SUCH DAMAGE.
  37.  *
  38.  *  @(#)var.h   8.2 (Berkeley) 5/4/95
  39.  */
  40.  
  41. /*
  42.  * Shell variables.
  43.  */
  44.  
  45. /* flags */
  46. #define VEXPORT     0x01    /* variable is exported */
  47. #define VREADONLY   0x02    /* variable cannot be modified */
  48. #define VSTRFIXED   0x04    /* variable struct is staticly allocated */
  49. #define VTEXTFIXED  0x08    /* text is staticly allocated */
  50. #define VSTACK      0x10    /* text is allocated on the stack */
  51. #define VUNSET      0x20    /* the variable is not set */
  52. #define VNOFUNC     0x40    /* don't call the callback function */
  53.  
  54.  
  55. struct var {
  56.     struct var *next;       /* next entry in hash list */
  57.     int flags;          /* flags are defined above */
  58.     char *text;         /* name=value */
  59.     void (*func) (const char *);
  60.                     /* function to be called when  */
  61.                     /* the variable gets set/unset */
  62. };
  63.  
  64.  
  65. struct localvar {
  66.     struct localvar *next;      /* next local variable in list */
  67.     struct var *vp;         /* the variable that was made local */
  68.     int flags;          /* saved flags */
  69.     char *text;         /* saved text */
  70. };
  71.  
  72.  
  73. struct localvar *localvars;
  74.  
  75. #if ATTY
  76. extern struct var vatty;
  77. #endif
  78. extern struct var vifs;
  79. extern struct var vmail;
  80. extern struct var vmpath;
  81. extern struct var vpath;
  82. extern struct var vps1;
  83. extern struct var vps2;
  84. #ifndef SMALL
  85. extern struct var vterm;
  86. extern struct var vtermcap;
  87. extern struct var vhistsize;
  88. #endif
  89.  
  90. /*
  91.  * The following macros access the values of the above variables.
  92.  * They have to skip over the name.  They return the null string
  93.  * for unset variables.
  94.  */
  95.  
  96. #define ifsval()    (vifs.text + 4)
  97. #define ifsset()    ((vifs.flags & VUNSET) == 0)
  98. #define mailval()   (vmail.text + 5)
  99. #define mpathval()  (vmpath.text + 9)
  100. #define pathval()   (vpath.text + 5)
  101. #define ps1val()    (vps1.text + 4)
  102. #define ps2val()    (vps2.text + 4)
  103. #define optindval() (voptind.text + 7)
  104. #ifndef SMALL
  105. #define histsizeval()   (vhistsize.text + 9)
  106. #define termval()   (vterm.text + 5)
  107. #endif
  108.  
  109. #if ATTY
  110. #define attyset()   ((vatty.flags & VUNSET) == 0)
  111. #endif
  112. #define mpathset()  ((vmpath.flags & VUNSET) == 0)
  113.  
  114. void initvar (void);
  115. void setvar (const char *, const char *, int);
  116. void setvareq (char *, int);
  117. struct strlist;
  118. void listsetvar (struct strlist *);
  119. char *lookupvar (const char *);
  120. char *bltinlookup (const char *, int);
  121. char **environment (void);
  122. void shprocvar (void);
  123. int showvarscmd (int, char **);
  124. int exportcmd (int, char **);
  125. int localcmd (int, char **);
  126. void mklocal (char *);
  127. void poplocalvars (void);
  128. int setvarcmd (int, char **);
  129. int unsetcmd (int, char **);
  130. int unsetvar (const char *);
  131. int setvarsafe (const char *, const char *, int);
  132.