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Annotation of src/usr.bin/make/varname.h, Revision 1.4

1.4     ! espie       1: /*     $OpenBSD$       */
1.1       espie       2: #ifndef VARNAME_H
                      3: #define VARNAME_H
                      4: /*
                      5:  * Copyright (c) 2001 Marc Espie.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  *
                     16:  * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
                     17:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
                     18:  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
                     19:  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
                     20:  * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
                     21:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
                     22:  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     23:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     24:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     25:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
                     26:  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     27:  */
                     28:
                     29: /* varname -
                     30:  *     Handles variable names in recursive situations, e.g.,
                     31:  *     to expand ${A${BC}}.
                     32:  */
                     33:
                     34: /* Used to store temporary names, e.g., after $ expansion. */
                     35: struct Name {
                     36:        const char      *s;             /* Start of name. */
                     37:        const char      *e;             /* End of name. */
                     38:        bool            tofree;         /* Needs freeing after use ? */
                     39: };
                     40:
                     41: /* endpos = VarName_Get(startpos, &name, ctxt, undef_is_bad, cont_function);
                     42:  *     Gets a variable name from startpos, storing the result into name.
                     43:  *     Recursive names are expanded from context ctxt. Boolean
                     44:  *     undef_is_bad governs whether undefined variables should trigger a
                     45:  *     parse error.  To parse its argument efficiently, VarName_Get
                     46:  *     uses cont_function(pos), which should return the position of the
                     47:  *     next $ in string, or the position where the variable spec ends (as
                     48:  *     differing modules have different requirements wrt variable spec
                     49:  *     endings). Returns the position where the variable spec finally
                     50:  *     ends. Name result might be a copy, or not. */
1.3       espie      51: extern const char *VarName_Get(const char *, struct Name *, SymTable *,
1.1       espie      52:     bool, const char *(*)(const char *));
                     53: /* VarName_Free(name);
                     54:  *     Frees a variable name filled by VarName_Get(). */
                     55: extern void VarName_Free(struct Name *);
                     56:
                     57: #endif