1 /* $OpenBSD: varname.c,v 1.7 2023/09/04 11:35:11 espie Exp $ */
2 /*
3 * Copyright (c) 2001 Marc Espie.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
15 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
18 * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <stdlib.h>
28 #include "defines.h"
29 #include "var.h"
30 #include "buf.h"
31 #include "varname.h"
32
33 const char *
VarName_Get(const char * start,struct Name * name,SymTable * ctxt,bool err,const char * (* cont)(const char *))34 VarName_Get(const char *start, struct Name *name, SymTable *ctxt, bool err,
35 const char *(*cont)(const char *))
36 {
37 const char *p;
38 size_t len;
39
40 p = cont(start);
41 if (*p != '$') {
42 name->s = start;
43 name->e = p;
44 name->tofree = false;
45 return p;
46 } else {
47 BUFFER buf;
48 Buf_Init(&buf, MAKE_BSIZE);
49 for (;;) {
50 Buf_Addi(&buf, start, p);
51 if (*p != '$') {
52 name->s = (const char *)Buf_Retrieve(&buf);
53 name->e = name->s + Buf_Size(&buf);
54 name->tofree = true;
55 return p;
56 }
57 start = p;
58 Var_ParseBuffer(&buf, start, ctxt, err, &len);
59 start += len;
60 p = cont(start);
61 }
62 }
63 }
64
65 void
VarName_Free(struct Name * name)66 VarName_Free(struct Name *name)
67 {
68 if (name->tofree)
69 free((char *)name->s);
70 }
71
72