Annotation of src/usr.bin/make/buf.c, Revision 1.8
1.8 ! espie 1: /* $OpenBSD: buf.c,v 1.7 1999/10/05 21:59:00 espie Exp $ */
1.5 millert 2: /* $NetBSD: buf.c,v 1.9 1996/12/31 17:53:21 christos Exp $ */
1.1 deraadt 3:
4: /*
1.8 ! espie 5: * Copyright (c) 1999 Marc Espie.
! 6: *
! 7: * Extensive code modifications for the OpenBSD project.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: *
! 18: * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
! 19: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
! 20: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
! 21: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
! 22: * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
! 23: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
! 24: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 25: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 26: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 27: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
! 28: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 29: */
! 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.
48: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the University of
51: * California, Berkeley and its contributors.
52: * 4. Neither the name of the University nor the names of its contributors
53: * may be used to endorse or promote products derived from this software
54: * without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66: * SUCH DAMAGE.
67: */
68:
69: #ifndef lint
70: #if 0
1.4 millert 71: static char sccsid[] = "@(#)buf.c 8.1 (Berkeley) 6/6/93";
1.1 deraadt 72: #else
1.8 ! espie 73: static char rcsid[] = "$OpenBSD: buf.c,v 1.7 1999/10/05 21:59:00 espie Exp $";
1.1 deraadt 74: #endif
75: #endif /* not lint */
76:
77: /*-
78: * buf.c --
79: * Functions for automatically-expanded buffers.
80: */
81:
82: #include "sprite.h"
83: #include "make.h"
84: #include "buf.h"
85:
86: #ifndef max
87: #define max(a,b) ((a) > (b) ? (a) : (b))
88: #endif
89:
90: /*
91: * BufExpand --
92: * Expand the given buffer to hold the given number of additional
1.8 ! espie 93: * chars.
! 94: * Makes sure there's room for an extra NULL char at the end of the
1.1 deraadt 95: * buffer in case it holds a string.
96: */
1.7 espie 97: #define BufExpand(bp,nb) \
98: if (bp->left < (nb)+1) { \
1.8 ! espie 99: char *newBuf; \
! 100: size_t newSize = (bp)->size; \
1.7 espie 101: \
102: do { \
103: newSize *= 2 ; \
104: (bp)->left = newSize - ((bp)->inPtr - (bp)->buffer); \
105: } while ((bp)->left < (nb)+1+BUF_MARGIN); \
1.8 ! espie 106: newBuf = erealloc((bp)->buffer, newSize); \
1.7 espie 107: (bp)->inPtr = newBuf + ((bp)->inPtr - (bp)->buffer); \
108: (bp)->outPtr = newBuf + ((bp)->outPtr - (bp)->buffer); \
109: (bp)->buffer = newBuf; \
110: (bp)->size = newSize; \
1.1 deraadt 111: }
112:
113: #define BUF_DEF_SIZE 256 /* Default buffer size */
1.7 espie 114: #define BUF_MARGIN 256 /* Make sure we are comfortable */
1.1 deraadt 115:
116: /*-
117: *-----------------------------------------------------------------------
1.8 ! espie 118: * Buf_OvAddChar --
! 119: * Add a single char to the buffer.
1.1 deraadt 120: *
121: * Side Effects:
122: * The buffer may be expanded.
123: *
124: *-----------------------------------------------------------------------
125: */
126: void
1.8 ! espie 127: Buf_OvAddChar(bp, byte)
! 128: Buffer bp;
! 129: char byte;
1.1 deraadt 130: {
1.8 ! espie 131: BufExpand(bp, 1);
1.1 deraadt 132:
133: *bp->inPtr++ = byte;
134: bp->left--;
135:
136: /*
137: * Null-terminate
138: */
139: *bp->inPtr = 0;
140: }
141:
142: /*-
143: *-----------------------------------------------------------------------
1.8 ! espie 144: * Buf_AddChars --
! 145: * Add a number of chars to the buffer.
1.1 deraadt 146: *
147: * Side Effects:
148: * Guess what?
149: *
150: *-----------------------------------------------------------------------
151: */
152: void
1.8 ! espie 153: Buf_AddChars(bp, numBytes, bytesPtr)
! 154: Buffer bp;
! 155: size_t numBytes;
! 156: const char *bytesPtr;
1.1 deraadt 157: {
158:
1.8 ! espie 159: BufExpand(bp, numBytes);
1.1 deraadt 160:
1.8 ! espie 161: memcpy(bp->inPtr, bytesPtr, numBytes);
1.1 deraadt 162: bp->inPtr += numBytes;
163: bp->left -= numBytes;
164:
165: /*
166: * Null-terminate
167: */
168: *bp->inPtr = 0;
169: }
170:
171: /*-
172: *-----------------------------------------------------------------------
173: * Buf_GetAll --
174: * Get all the available data at once.
175: *
176: * Results:
1.8 ! espie 177: * A pointer to the data and the number of chars available.
1.1 deraadt 178: *
179: *-----------------------------------------------------------------------
180: */
1.8 ! espie 181: char *
! 182: Buf_GetAll(bp, numBytesPtr)
! 183: Buffer bp;
! 184: size_t *numBytesPtr;
1.1 deraadt 185: {
186:
1.8 ! espie 187: if (numBytesPtr != NULL) {
1.1 deraadt 188: *numBytesPtr = bp->inPtr - bp->outPtr;
189: }
1.4 millert 190:
1.1 deraadt 191: return (bp->outPtr);
192: }
193:
194: /*-
195: *-----------------------------------------------------------------------
196: * Buf_Discard --
1.8 ! espie 197: * Throw away chars in a buffer.
1.1 deraadt 198: *
199: * Side Effects:
1.8 ! espie 200: * The chars are discarded.
1.1 deraadt 201: *
202: *-----------------------------------------------------------------------
203: */
204: void
1.8 ! espie 205: Buf_Discard(bp, numBytes)
! 206: Buffer bp;
! 207: size_t numBytes;
1.1 deraadt 208: {
209:
210: if (bp->inPtr - bp->outPtr <= numBytes) {
211: bp->inPtr = bp->outPtr = bp->buffer;
212: bp->left = bp->size;
213: *bp->inPtr = 0;
214: } else {
215: bp->outPtr += numBytes;
216: }
217: }
218:
219: /*-
220: *-----------------------------------------------------------------------
221: * Buf_Size --
1.8 ! espie 222: * Returns the number of chars in the given buffer. Doesn't include
! 223: * the null-terminating char.
1.1 deraadt 224: *
225: * Results:
1.8 ! espie 226: * The number of chars.
1.1 deraadt 227: *
228: *-----------------------------------------------------------------------
229: */
230: int
231: Buf_Size (buf)
232: Buffer buf;
233: {
234: return (buf->inPtr - buf->outPtr);
235: }
236:
237: /*-
238: *-----------------------------------------------------------------------
239: * Buf_Init --
240: * Initialize a buffer. If no initial size is given, a reasonable
241: * default is used.
242: *
243: * Results:
244: * A buffer to be given to other functions in this library.
245: *
246: * Side Effects:
247: * The buffer is created, the space allocated and pointers
248: * initialized.
249: *
250: *-----------------------------------------------------------------------
251: */
252: Buffer
1.8 ! espie 253: Buf_Init(size)
! 254: size_t size; /* Initial size for the buffer */
1.1 deraadt 255: {
1.8 ! espie 256: Buffer bp; /* New Buffer */
1.1 deraadt 257:
258: bp = (Buffer)emalloc(sizeof(*bp));
259:
1.8 ! espie 260: if (size == 0) {
1.1 deraadt 261: size = BUF_DEF_SIZE;
262: }
263: bp->left = bp->size = size;
1.8 ! espie 264: bp->buffer = emalloc(size);
1.1 deraadt 265: bp->inPtr = bp->outPtr = bp->buffer;
266: *bp->inPtr = 0;
267:
268: return (bp);
269: }
270:
271: /*-
272: *-----------------------------------------------------------------------
273: * Buf_Destroy --
274: * Nuke a buffer and all its resources.
275: *
276: * Side Effects:
277: * The buffer is freed.
278: *
279: *-----------------------------------------------------------------------
280: */
281: void
1.8 ! espie 282: Buf_Destroy(buf, freeData)
1.1 deraadt 283: Buffer buf; /* Buffer to destroy */
284: Boolean freeData; /* TRUE if the data should be destroyed as well */
285: {
1.4 millert 286:
1.1 deraadt 287: if (freeData) {
1.8 ! espie 288: free(buf->buffer);
1.1 deraadt 289: }
290: free ((char *)buf);
1.4 millert 291: }
292:
293: /*-
294: *-----------------------------------------------------------------------
1.8 ! espie 295: * Buf_ReplaceLastChar --
! 296: * Replace the last char in a buffer.
1.4 millert 297: *
298: * Side Effects:
299: * If the buffer was empty intially, then a new byte will be added.
300: * Otherwise, the last byte is overwritten.
301: *
302: *-----------------------------------------------------------------------
303: */
304: void
1.8 ! espie 305: Buf_ReplaceLastChar(buf, byte)
! 306: Buffer buf; /* buffer to augment */
! 307: char byte; /* byte to be written */
1.4 millert 308: {
309: if (buf->inPtr == buf->outPtr)
1.8 ! espie 310: Buf_AddChar(buf, byte);
1.4 millert 311: else
312: *(buf->inPtr - 1) = byte;
1.1 deraadt 313: }
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