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 * 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 66 VarName_Free(struct Name *name) 67 { 68 if (name->tofree) 69 free((char *)name->s); 70 } 71 72