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avoid SIGBUS in byte_copy

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leitner 2002-08-14 15:54:49 +00:00
parent 52b12478c6
commit a0dbb50dc7
2 changed files with 10 additions and 15 deletions
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2
CHANGES
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@ -1,5 +1,5 @@
0.14:
only use faster byte_copy on i386
avoid bus errors in byte_copy
0.13:
fixed several bugs in test/uudecode.c

23
byte/byte_copy.c
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@ -6,23 +6,18 @@ void byte_copy(void* out, unsigned int len, const void* in) {
register char* s=out;
register const char* t=in;
register const char* u=t+len;
#ifdef __i386__
if (len>127) {
if (sizeof(unsigned long)>4) { /* a good compiler should optimize this check away */
for (;(unsigned long)t&7;) {
if (t==u) break; *s=*t; ++s; ++t;
}
} else {
for (;(unsigned long)t&3;) {
if (t==u) break; *s=*t; ++s; ++t;
}
while ((unsigned long)s&(sizeof(unsigned long)-1))
if (t==u) break; *s=*t; ++s; ++t;
}
while (t+sizeof(long)<=u) {
*(unsigned long*)s=*(unsigned long*)t;
s+=sizeof(long); t+=sizeof(long);
}
}
/* s (destination) is now unsigned long aligned */
#ifndef __i386__
if (!((unsigned long)t&(sizeof(unsigned long)-1)))
#endif
while (t+sizeof(unsigned long)<=u) {
*(unsigned long*)s=*(unsigned long*)t;
s+=sizeof(unsigned long); t+=sizeof(unsigned long);
}
for (;;) {
if (t==u) break; *s=*t; ++s; ++t;
if (t==u) break; *s=*t; ++s; ++t;