summary refs log blame commit diff
path: root/bin/cash/memalloc.c
blob: e43ce4cdbc3da800840403b23fa9a77f649ae1d3 (plain) (tree) 
308a14f8 ^
























































































































































































































































































































































1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
























































































































































































































































































































































                                                                                      
/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)memalloc.c	8.3 (Berkeley) 5/4/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: releng/12.0/bin/sh/memalloc.c 326025 2017-11-20 19:49:47Z pfg $");

#include <sys/param.h>
#include "shell.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include "mystring.h"
#include "expand.h"
#include <stdlib.h>
#include <unistd.h>

/*
 * Like malloc, but returns an error when out of space.
 */

pointer
ckmalloc(size_t nbytes)
{
	pointer p;

	INTOFF;
	p = malloc(nbytes);
	INTON;
	if (p == NULL)
		error("Out ofLars Hjemli
2009-12-08
|\ \
| * | First version of side-by-side diff.Ragnar Ouchterlony2009-09-16
| |/
generated by cgit-pink 1.4.1 (git 2.36.1) at 2026-09-22 15:35:36 +0000
pan class="Id">savestr(const char *s) { char *p; size_t len; len = strlen(s); p = ckmalloc(len + 1); memcpy(p, s, len + 1); return p; } /* * Parse trees for commands are allocated in lifo order, so we use a stack * to make this more efficient, and also to avoid all sorts of exception * handling code to handle interrupts in the middle of a parse. * * The size 496 was chosen because with 16-byte alignment the total size * for the allocated block is 512. */ #define MINSIZE 496 /* minimum size of a block. */ struct stack_block { struct stack_block *prev; /* Data follows */ }; #define SPACE(sp) ((char*)(sp) + ALIGN(sizeof(struct stack_block))) static struct stack_block *stackp; char *stacknxt; int stacknleft; char *sstrend; static void stnewblock(int nbytes) { struct stack_block *sp; int allocsize; if (nbytes < MINSIZE) nbytes = MINSIZE; allocsize = ALIGN(sizeof(struct stack_block)) + ALIGN(nbytes); INTOFF; sp = ckmalloc(allocsize); sp->prev = stackp; stacknxt = SPACE(sp); stacknleft = allocsize - (stacknxt - (char*)sp); sstrend = stacknxt + stacknleft; stackp = sp; INTON; } pointer stalloc(int nbytes) { char *p; nbytes = ALIGN(nbytes); if (nbytes > stacknleft) stnewblock(nbytes); p = stacknxt; stacknxt += nbytes; stacknleft -= nbytes; return p; } void stunalloc(pointer p) { if (p == NULL) { /*DEBUG */ write(STDERR_FILENO, "stunalloc\n", 10); abort(); } stacknleft += stacknxt - (char *)p; stacknxt = p; } char * stsavestr(const char *s) { char *p; size_t len; len = strlen(s); p = stalloc(len + 1); memcpy(p, s, len + 1); return p; } void setstackmark(struct stackmark *mark) { mark->stackp = stackp; mark->stacknxt = stacknxt; mark->stacknleft = stacknleft; /* Ensure this block stays in place. */ if (stackp != NULL && stacknxt == SPACE(stackp)) stalloc(1); } void popstackmark(struct stackmark *mark) { struct stack_block *sp; INTOFF; while (stackp != mark->stackp) { sp = stackp; stackp = sp->prev; ckfree(sp); } stacknxt = mark->stacknxt; stacknleft = mark->stacknleft; sstrend = stacknxt + stacknleft; INTON; } /* * When the parser reads in a string, it wants to stick the string on the * stack and only adjust the stack pointer when it knows how big the * string is. Stackblock (defined in stack.h) returns a pointer to a block * of space on top of the stack and stackblocklen returns the length of * this block. Growstackblock will grow this space by at least one byte, * possibly moving it (like realloc). Grabstackblock actually allocates the * part of the block that has been used. */ static void growstackblock(int min) { char *p; int newlen; char *oldspace; int oldlen; struct stack_block *sp; struct stack_block *oldstackp; if (min < stacknleft) min = stacknleft; if ((unsigned int)min >= INT_MAX / 2 - ALIGN(sizeof(struct stack_block))) error("Out of space"); min += stacknleft; min += ALIGN(sizeof(struct stack_block)); newlen = 512; while (newlen < min) newlen <<= 1; oldspace = stacknxt; oldlen = stacknleft; if (stackp != NULL && stacknxt == SPACE(stackp)) { INTOFF; oldstackp = stackp; stackp = oldstackp->prev; sp = ckrealloc((pointer)oldstackp, newlen); sp->prev = stackp; stackp = sp; stacknxt = SPACE(sp); stacknleft = newlen - (stacknxt - (char*)sp); sstrend = stacknxt + stacknleft; INTON; } else { newlen -= ALIGN(sizeof(struct stack_block)); p = stalloc(newlen); if (oldlen != 0) memcpy(p, oldspace, oldlen); stunalloc(p); } } /* * The following routines are somewhat easier to use that the above. * The user declares a variable of type STACKSTR, which may be declared * to be a register. The macro STARTSTACKSTR initializes things. Then * the user uses the macro STPUTC to add characters to the string. In * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is * grown as necessary. When the user is done, she can just leave the * string there and refer to it using stackblock(). Or she can allocate * the space for it using grabstackstr(). If it is necessary to allow * someone else to use the stack temporarily and then continue to grow * the string, the user should use grabstack to allocate the space, and * then call ungrabstr(p) to return to the previous mode of operation. * * USTPUTC is like STPUTC except that it doesn't check for overflow. * CHECKSTACKSPACE can be called before USTPUTC to ensure that there * is space for at least one character. */ static char * growstrstackblock(int n, int min) { growstackblock(min); return stackblock() + n; } char * growstackstr(void) { int len; len = stackblocksize(); return (growstrstackblock(len, 0)); } /* * Called from CHECKSTRSPACE. */ char * makestrspace(int min, char *p) { int len; len = p - stackblock(); return (growstrstackblock(len, min)); } char * stputbin(const char *data, size_t len, char *p) { CHECKSTRSPACE(len, p); memcpy(p, data, len); return (p + len); } char * stputs(const char *data, char *p) { return (stputbin(data, strlen(data), p)); }
generated by cgit-pink 1.4.1 (git 2.36.1) at 2026-09-22 15:35:36 +0000