Annotation of src/usr.bin/make/buf.c, Revision 1.19
1.19 ! christos 1: /* $NetBSD: buf.c,v 1.18 2005/08/05 00:53:18 christos Exp $ */
1.6 christos 2:
1.1 cgd 3: /*
4: * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
1.14 agc 5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Adam de Boor.
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: * 3. Neither the name of the University nor the names of its contributors
19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: */
34:
35: /*
1.1 cgd 36: * Copyright (c) 1988, 1989 by Adam de Boor
37: * Copyright (c) 1989 by Berkeley Softworks
38: * All rights reserved.
39: *
40: * This code is derived from software contributed to Berkeley by
41: * Adam de Boor.
42: *
43: * Redistribution and use in source and binary forms, with or without
44: * modification, are permitted provided that the following conditions
45: * are met:
46: * 1. Redistributions of source code must retain the above copyright
47: * notice, this list of conditions and the following disclaimer.
48: * 2. Redistributions in binary form must reproduce the above copyright
49: * notice, this list of conditions and the following disclaimer in the
50: * documentation and/or other materials provided with the distribution.
51: * 3. All advertising materials mentioning features or use of this software
52: * must display the following acknowledgement:
53: * This product includes software developed by the University of
54: * California, Berkeley and its contributors.
55: * 4. Neither the name of the University nor the names of its contributors
56: * may be used to endorse or promote products derived from this software
57: * without specific prior written permission.
58: *
59: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69: * SUCH DAMAGE.
70: */
71:
1.15 ross 72: #ifndef MAKE_NATIVE
1.19 ! christos 73: static char rcsid[] = "$NetBSD: buf.c,v 1.18 2005/08/05 00:53:18 christos Exp $";
1.11 lukem 74: #else
1.10 christos 75: #include <sys/cdefs.h>
1.1 cgd 76: #ifndef lint
1.6 christos 77: #if 0
1.8 christos 78: static char sccsid[] = "@(#)buf.c 8.1 (Berkeley) 6/6/93";
1.6 christos 79: #else
1.19 ! christos 80: __RCSID("$NetBSD: buf.c,v 1.18 2005/08/05 00:53:18 christos Exp $");
1.6 christos 81: #endif
1.1 cgd 82: #endif /* not lint */
1.11 lukem 83: #endif
1.1 cgd 84:
85: /*-
86: * buf.c --
87: * Functions for automatically-expanded buffers.
88: */
89:
90: #include "sprite.h"
1.4 cgd 91: #include "make.h"
1.1 cgd 92: #include "buf.h"
93:
94: #ifndef max
95: #define max(a,b) ((a) > (b) ? (a) : (b))
96: #endif
97:
98: /*
99: * BufExpand --
100: * Expand the given buffer to hold the given number of additional
101: * bytes.
102: * Makes sure there's room for an extra NULL byte at the end of the
103: * buffer in case it holds a string.
104: */
105: #define BufExpand(bp,nb) \
1.12 mycroft 106: while (bp->left < (nb)+1) {\
107: int newSize = (bp)->size * 2; \
1.17 christos 108: Byte *newBuf = (Byte *)erealloc((bp)->buffer, newSize); \
1.1 cgd 109: \
110: (bp)->inPtr = newBuf + ((bp)->inPtr - (bp)->buffer); \
111: (bp)->outPtr = newBuf + ((bp)->outPtr - (bp)->buffer);\
112: (bp)->buffer = newBuf;\
113: (bp)->size = newSize;\
114: (bp)->left = newSize - ((bp)->inPtr - (bp)->buffer);\
115: }
116:
117: #define BUF_DEF_SIZE 256 /* Default buffer size */
118:
119: /*-
120: *-----------------------------------------------------------------------
121: * Buf_OvAddByte --
122: * Add a single byte to the buffer. left is zero or negative.
123: *
124: * Results:
125: * None.
126: *
127: * Side Effects:
128: * The buffer may be expanded.
129: *
130: *-----------------------------------------------------------------------
131: */
132: void
1.13 wiz 133: Buf_OvAddByte(Buffer bp, int byte)
1.1 cgd 134: {
1.5 jtc 135: int nbytes = 1;
1.1 cgd 136: bp->left = 0;
1.17 christos 137: BufExpand(bp, nbytes);
1.1 cgd 138:
139: *bp->inPtr++ = byte;
140: bp->left--;
141:
142: /*
143: * Null-terminate
144: */
145: *bp->inPtr = 0;
146: }
147:
148: /*-
149: *-----------------------------------------------------------------------
150: * Buf_AddBytes --
151: * Add a number of bytes to the buffer.
152: *
153: * Results:
154: * None.
155: *
156: * Side Effects:
157: * Guess what?
158: *
159: *-----------------------------------------------------------------------
160: */
161: void
1.13 wiz 162: Buf_AddBytes(Buffer bp, int numBytes, const Byte *bytesPtr)
1.1 cgd 163: {
164:
1.17 christos 165: BufExpand(bp, numBytes);
1.1 cgd 166:
1.17 christos 167: memcpy(bp->inPtr, bytesPtr, numBytes);
1.1 cgd 168: bp->inPtr += numBytes;
169: bp->left -= numBytes;
170:
171: /*
172: * Null-terminate
173: */
174: *bp->inPtr = 0;
175: }
176:
177: /*-
178: *-----------------------------------------------------------------------
179: * Buf_GetAll --
180: * Get all the available data at once.
181: *
182: * Results:
183: * A pointer to the data and the number of bytes available.
184: *
185: * Side Effects:
186: * None.
187: *
188: *-----------------------------------------------------------------------
189: */
190: Byte *
1.13 wiz 191: Buf_GetAll(Buffer bp, int *numBytesPtr)
1.1 cgd 192: {
193:
1.19 ! christos 194: if (numBytesPtr != NULL) {
1.1 cgd 195: *numBytesPtr = bp->inPtr - bp->outPtr;
196: }
1.8 christos 197:
1.1 cgd 198: return (bp->outPtr);
199: }
200:
201: /*-
202: *-----------------------------------------------------------------------
203: * Buf_Discard --
204: * Throw away bytes in a buffer.
205: *
206: * Results:
207: * None.
208: *
209: * Side Effects:
1.8 christos 210: * The bytes are discarded.
1.1 cgd 211: *
212: *-----------------------------------------------------------------------
213: */
214: void
1.13 wiz 215: Buf_Discard(Buffer bp, int numBytes)
1.1 cgd 216: {
217:
218: if (bp->inPtr - bp->outPtr <= numBytes) {
219: bp->inPtr = bp->outPtr = bp->buffer;
220: bp->left = bp->size;
221: *bp->inPtr = 0;
222: } else {
223: bp->outPtr += numBytes;
224: }
225: }
226:
227: /*-
228: *-----------------------------------------------------------------------
229: * Buf_Size --
230: * Returns the number of bytes in the given buffer. Doesn't include
231: * the null-terminating byte.
232: *
233: * Results:
234: * The number of bytes.
235: *
236: * Side Effects:
237: * None.
238: *
239: *-----------------------------------------------------------------------
240: */
241: int
1.13 wiz 242: Buf_Size(Buffer buf)
1.1 cgd 243: {
244: return (buf->inPtr - buf->outPtr);
245: }
246:
247: /*-
248: *-----------------------------------------------------------------------
249: * Buf_Init --
250: * Initialize a buffer. If no initial size is given, a reasonable
251: * default is used.
252: *
1.13 wiz 253: * Input:
254: * size Initial size for the buffer
255: *
1.1 cgd 256: * Results:
257: * A buffer to be given to other functions in this library.
258: *
259: * Side Effects:
260: * The buffer is created, the space allocated and pointers
261: * initialized.
262: *
263: *-----------------------------------------------------------------------
264: */
265: Buffer
1.13 wiz 266: Buf_Init(int size)
1.1 cgd 267: {
268: Buffer bp; /* New Buffer */
269:
1.16 christos 270: bp = emalloc(sizeof(*bp));
1.1 cgd 271:
272: if (size <= 0) {
273: size = BUF_DEF_SIZE;
274: }
275: bp->left = bp->size = size;
1.16 christos 276: bp->buffer = emalloc(size);
1.1 cgd 277: bp->inPtr = bp->outPtr = bp->buffer;
278: *bp->inPtr = 0;
279:
280: return (bp);
281: }
282:
283: /*-
284: *-----------------------------------------------------------------------
285: * Buf_Destroy --
286: * Nuke a buffer and all its resources.
287: *
1.13 wiz 288: * Input:
289: * buf Buffer to destroy
290: * freeData TRUE if the data should be destroyed
291: *
1.1 cgd 292: * Results:
293: * None.
294: *
295: * Side Effects:
296: * The buffer is freed.
297: *
298: *-----------------------------------------------------------------------
299: */
300: void
1.13 wiz 301: Buf_Destroy(Buffer buf, Boolean freeData)
1.1 cgd 302: {
1.8 christos 303:
1.1 cgd 304: if (freeData) {
1.18 christos 305: free(buf->buffer);
1.1 cgd 306: }
1.18 christos 307: free(buf);
1.8 christos 308: }
309:
310: /*-
311: *-----------------------------------------------------------------------
312: * Buf_ReplaceLastByte --
313: * Replace the last byte in a buffer.
314: *
1.13 wiz 315: * Input:
316: * buf buffer to augment
317: * byte byte to be written
318: *
1.8 christos 319: * Results:
320: * None.
321: *
322: * Side Effects:
323: * If the buffer was empty intially, then a new byte will be added.
324: * Otherwise, the last byte is overwritten.
325: *
326: *-----------------------------------------------------------------------
327: */
328: void
1.13 wiz 329: Buf_ReplaceLastByte(Buffer buf, int byte)
1.8 christos 330: {
331: if (buf->inPtr == buf->outPtr)
332: Buf_AddByte(buf, byte);
333: else
334: *(buf->inPtr - 1) = byte;
1.1 cgd 335: }
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to buf.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / usr.bin / make