usr.bin/make/buf.c

   1 /*-
   2  * Copyright (c) 2005 Max Okumoto
   3  * Copyright (c) 1988, 1989, 1990, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1988, 1989 by Adam de Boor
   6  * Copyright (c) 1989 by Berkeley Softworks
   7  * All rights reserved.
   8  *
   9  * This code is derived from software contributed to Berkeley by
  10  * Adam de Boor.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  * @(#)buf.c    8.1 (Berkeley) 6/6/93
  41  * $FreeBSD: src/usr.bin/make/buf.c,v 1.32 2005/02/07 11:27:47 harti Exp $
  42  * $DragonFly: src/usr.bin/make/buf.c,v 1.43 2005/09/24 07:37:38 okumoto Exp $
  43  */
  44
  45 /*
  46  * buf.c
  47  *      Functions for automatically-expanded buffers.
  48  */
  49
  50 #include <string.h>
  51 #include <stdlib.h>
  52
  53 #include "buf.h"
  54 #include "util.h"
  55
  56 /**
  57  * Returns the number of bytes in the buffer.  Doesn't include the
  58  * null-terminating byte.
  59  *
  60  * @return The number of bytes in Buffer object.
  61  */
  62 inline size_t
  63 Buf_Size(const Buffer *buf)
  64 {
  65         return (buf->end - buf->buf);
  66 }
  67
  68 /**
  69  * Returns a reference to the data contained in the buffer.
  70  *
  71  * @note Adding data to the Buffer object may invalidate the reference.
  72  */
  73 inline char *
  74 Buf_Data(const Buffer *bp)
  75 {
  76         return (bp->buf);
  77 }
  78
  79 /**
  80  * Expand the buffer to hold the number of additional bytes, plus
  81  * space to store a terminating NULL byte.
  82  */
  83 static inline void
  84 BufExpand(Buffer *bp, size_t nb)
  85 {
  86         size_t  len = Buf_Size(bp);
  87         if (bp->size < len + nb + 1) {
  88                 int size = bp->size + MAX(nb + 1, BUF_ADD_INC);
  89
  90                 bp->buf         = erealloc(bp->buf, size);
  91                 bp->size        = size;
  92                 bp->end         = bp->buf + len;
  93         }
  94 }
  95
  96 /**
  97  * Add a single byte to the buffer.
  98  */
  99 inline void
 100 Buf_AddByte(Buffer *bp, char byte)
 101 {
 102         BufExpand(bp, 1);
 103
 104         *bp->end = byte;
 105         bp->end++;
 106         *bp->end = '\0';
 107 }
 108
 109 /**
 110  * Add bytes to the buffer.
 111  */
 112 void
 113 Buf_AddBytes(Buffer *bp, size_t len, const char bytes[])
 114 {
 115         BufExpand(bp, len);
 116
 117         memcpy(bp->end, bytes, len);
 118         bp->end += len;
 119         *bp->end = '\0';
 120 }
 121
 122 /**
 123  * Get the contents of a buffer and destroy the buffer. If the buffer
 124  * is NULL, return NULL.
 125  *
 126  * Returns:
 127  *      the pointer to the data.
 128  */
 129 char *
 130 Buf_Peel(Buffer *bp)
 131 {
 132         char *ret;
 133
 134         if (bp == NULL)
 135                 return (NULL);
 136         ret = bp->buf;
 137         free(bp);
 138         return (ret);
 139 }
 140
 141 /**
 142  * Initialize a buffer. If no initial size is given, a reasonable
 143  * default is used.
 144  *
 145  * @return A buffer object to be given to other functions in this library.
 146  *
 147  * Side Effects:
 148  *      Space is allocated for the Buffer object and a internal buffer.
 149  */
 150 Buffer *
 151 Buf_Init(size_t size)
 152 {
 153         Buffer *bp;     /* New Buffer */
 154
 155         if (size <= 0)
 156                 size = BUF_DEF_SIZE;
 157
 158         bp = emalloc(sizeof(*bp));
 159         bp->size        = size;
 160         bp->buf         = emalloc(size);
 161         bp->end         = bp->buf;
 162         *bp->end        = '\0';
 163
 164         return (bp);
 165 }
 166
 167 /**
 168  * Destroy a buffer, and optionally free its data, too.
 169  *
 170  * Side Effects:
 171  *      Space for the Buffer object and possibly the internal buffer
 172  *      is de-allocated.
 173  */
 174 void
 175 Buf_Destroy(Buffer *buf, bool freeData)
 176 {
 177         if (freeData)
 178                 free(buf->buf);
 179         free(buf);
 180 }
 181
 182 /**
 183  * Replace the last byte in a buffer.  If the buffer was empty
 184  * intially, then a new byte will be added.
 185  */
 186 void
 187 Buf_ReplaceLastByte(Buffer *bp, char byte)
 188 {
 189         if (bp->end == bp->buf) {
 190                 Buf_AddByte(bp, byte);
 191         } else {
 192                 *(bp->end - 1) = byte;
 193         }
 194 }
 195
 196 /**
 197  * Append characters in str to Buffer object
 198  */
 199 void
 200 Buf_Append(Buffer *bp, const char str[])
 201 {
 202         Buf_AddBytes(bp, strlen(str), str);
 203 }
 204
 205 /**
 206  * Append characters in buf to Buffer object
 207  */
 208 void
 209 Buf_AppendBuf(Buffer *bp, const Buffer *buf)
 210 {
 211         Buf_AddBytes(bp, Buf_Size(buf), buf->buf);
 212 }
 213
 214 /**
 215  * Append characters between str and end to Buffer object.
 216  */
 217 void
 218 Buf_AppendRange(Buffer *bp, const char str[], const char *end)
 219 {
 220         Buf_AddBytes(bp, end - str, str);
 221 }
 222
 223 /**
 224  * Convert newlines in buffer to spaces.  The trailing newline is
 225  * removed.
 226  */
 227 void
 228 Buf_StripNewlines(Buffer *bp)
 229 {
 230         char *ptr = bp->end;
 231
 232         /*
 233          * If there is anything in the buffer, remove the last
 234          * newline character.
 235          */
 236         if (ptr != bp->buf) {
 237                 if (*(ptr - 1) == '\n') {
 238                         /* shorten buffer */
 239                         *(ptr - 1) = '\0';
 240                         --bp->end;
 241                 }
 242                 --ptr;
 243         }
 244
 245         /* Convert newline characters to a space characters.  */
 246         while (ptr != bp->buf) {
 247                 if (*ptr == '\n') {
 248                         *ptr = ' ';
 249                 }
 250                 --ptr;
 251         }
 252 }
 253
 254 /**
 255  * Clear the contents of the buffer.
 256  */
 257 void
 258 Buf_Clear(Buffer *bp)
 259 {
 260         bp->end = bp->buf;
 261         *bp->end = '\0';
 262 }
 263