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Fix memmove()

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[The lcc source] overrides the libc memmove() with its own implementation,
but that implementation fails to follow the specification. In particular,
it returns NULL rather than memmove()'s first parameter.

GCC now optimizes based on this aspect of the specification, so things go
wrong at runtime.

[Text & patch from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56881#c8]
This commit is contained in:
Mikael Pettersson 2013-04-14 10:56:47 +02:00 committed by Tim Angus
parent 6983187a99
commit 1c66e30e7e
1 changed files with 2 additions and 2 deletions
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4
code/tools/lcc/cpp/unix.c
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@ -109,7 +109,7 @@ memmove(void *dp, const void *sp, size_t n)
unsigned char *cdp, *csp; unsigned char *cdp, *csp;
if (n<=0) if (n<=0)
return 0; return dp;
cdp = dp; cdp = dp;
csp = (unsigned char *)sp; csp = (unsigned char *)sp;
if (cdp < csp) { if (cdp < csp) {
@ -123,6 +123,6 @@ memmove(void *dp, const void *sp, size_t n)
*--cdp = *--csp; *--cdp = *--csp;
} while (--n); } while (--n);
} }
return 0; return dp;
} }
#endif #endif