Annotation of src/usr.bin/make/buf.c, Revision 1.21
1.15 espie 1: /* $OpenPackages$ */
1.21 ! espie 2: /* $OpenBSD: buf.c,v 1.20 2004/04/07 13:11:35 espie Exp $ */
1.15 espie 3: /* $NetBSD: buf.c,v 1.9 1996/12/31 17:53:21 christos Exp $ */
1.1 deraadt 4:
5: /*
1.8 espie 6: * Copyright (c) 1999 Marc Espie.
7: *
1.15 espie 8: * Extensive code changes for the OpenBSD project.
1.8 espie 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: *
19: * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
23: * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30: */
31: /*
1.1 deraadt 32: * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
33: * Copyright (c) 1988, 1989 by Adam de Boor
34: * Copyright (c) 1989 by Berkeley Softworks
35: * All rights reserved.
36: *
37: * This code is derived from software contributed to Berkeley by
38: * Adam de Boor.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
1.19 millert 48: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: */
64:
65: /*-
66: * buf.c --
1.20 espie 67: * Functions for automatically expanded buffers.
1.1 deraadt 68: */
69:
1.16 espie 70: #include <ctype.h>
71: #include <stddef.h>
1.17 espie 72: #include <string.h>
1.16 espie 73: #include "config.h"
74: #include "defines.h"
75: #include "buf.h"
76: #include "stats.h"
77: #include "memory.h"
1.15 espie 78:
79: #ifdef STATS_BUF
80: #define DO_STAT_BUF(bp, nb) \
81: STAT_BUFS_EXPANSION++; \
82: if ((bp)->endPtr - (bp)->buffer == 1) \
83: STAT_WEIRD_INEFFICIENT++;
84: #else
85: #define DO_STAT_BUF(a, b)
86: #endif
87:
1.16 espie 88: /* BufExpand(bp, nb)
89: * Expand buffer bp to hold upto nb additional
1.15 espie 90: * chars. Makes sure there's room for an extra '\0' char at
91: * the end of the buffer to terminate the string. */
92: #define BufExpand(bp,nb) \
1.11 espie 93: do { \
1.21 ! espie 94: size_t occupied = (bp)->inPtr - (bp)->buffer; \
! 95: size_t size = (bp)->endPtr - (bp)->buffer; \
! 96: DO_STAT_BUF(bp, nb); \
1.11 espie 97: \
1.21 ! espie 98: do { \
! 99: size *= 2 ; \
! 100: } while (size - occupied < (nb)+1+BUF_MARGIN); \
! 101: (bp)->buffer = (bp)->inPtr = (bp)->endPtr = \
! 102: erealloc((bp)->buffer, size); \
! 103: (bp)->inPtr += occupied; \
! 104: (bp)->endPtr += size; \
1.11 espie 105: } while (0);
1.1 deraadt 106:
1.15 espie 107: #define BUF_DEF_SIZE 256 /* Default buffer size */
1.7 espie 108: #define BUF_MARGIN 256 /* Make sure we are comfortable */
1.1 deraadt 109:
1.16 espie 110: /* the hard case for Buf_AddChar: buffer must be expanded to accommodate
1.9 espie 111: * one more char. */
1.1 deraadt 112: void
1.20 espie 113: BufOverflow(Buffer bp)
1.1 deraadt 114: {
1.21 ! espie 115: BufExpand(bp, 1);
1.1 deraadt 116: }
1.11 espie 117:
1.15 espie 118:
1.1 deraadt 119: void
1.20 espie 120: Buf_AddChars(Buffer bp, size_t numBytes, const char *bytesPtr)
1.1 deraadt 121: {
122:
1.21 ! espie 123: if ((size_t)(bp->endPtr - bp->inPtr) < numBytes+1)
! 124: BufExpand(bp, numBytes);
1.1 deraadt 125:
1.21 ! espie 126: memcpy(bp->inPtr, bytesPtr, numBytes);
! 127: bp->inPtr += numBytes;
1.1 deraadt 128: }
129:
1.15 espie 130:
1.12 espie 131: void
1.20 espie 132: Buf_Init(Buffer bp, size_t size)
1.1 deraadt 133: {
1.15 espie 134: #ifdef STATS_BUF
1.21 ! espie 135: STAT_TOTAL_BUFS++;
! 136: if (size == 0)
! 137: STAT_DEFAULT_BUFS++;
! 138: if (size == 1)
! 139: STAT_WEIRD_BUFS++;
1.15 espie 140: #endif
1.21 ! espie 141: if (size == 0)
! 142: size = BUF_DEF_SIZE;
! 143: bp->inPtr = bp->endPtr = bp->buffer = emalloc(size);
! 144: bp->endPtr += size;
1.4 millert 145: }
1.11 espie 146:
1.4 millert 147: void
1.20 espie 148: Buf_KillTrailingSpaces(Buffer bp)
1.4 millert 149: {
1.21 ! espie 150: while (bp->inPtr > bp->buffer + 1 && isspace(bp->inPtr[-1])) {
! 151: if (bp->inPtr[-2] == '\\')
! 152: break;
! 153: bp->inPtr--;
! 154: }
1.1 deraadt 155: }
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