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annotate alloc.c @ 10:3bfef1f22a97

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trivial changes to get rid of compile-time warnings
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Fri, 31 Jan 2025 15:26:11 +0000
parents 2cb46628feec
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "alloc.h"
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2 #include "error.h"
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3bfef1f22a97 trivial changes to get rid of compile-time warnings
Henry S. Thompson <ht@inf.ed.ac.uk>
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3 #include <stdlib.h>
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4
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5 #define ALIGNMENT 16 /* XXX: assuming that this alignment is enough */
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6 #define SPACE 4096 /* must be multiple of ALIGNMENT */
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7
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8 typedef union { char irrelevant[ALIGNMENT]; double d; } aligned;
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9 static aligned realspace[SPACE / ALIGNMENT];
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10 #define space ((char *) realspace)
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11 static unsigned int avail = SPACE; /* multiple of ALIGNMENT; 0<=avail<=SPACE */
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12
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13 /*@null@*//*@out@*/char *alloc(n)
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14 unsigned int n;
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15 {
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16 char *x;
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17 n = ALIGNMENT + n - (n & (ALIGNMENT - 1)); /* XXX: could overflow */
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18 if (n <= avail) { avail -= n; return space + avail; }
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19 x = malloc(n);
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20 if (!x) errno = error_nomem;
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21 return x;
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22 }
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23
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24 void alloc_free(x)
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25 char *x;
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26 {
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27 if (x >= space)
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28 if (x < space + SPACE)
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29 return; /* XXX: assuming that pointers are flat */
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30 free(x);
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31 }