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memio.c (mseek): just seek to end if offset is past the end of file

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fixes https://github.com/cmatsuoka/libxmp/issues/156
This commit is contained in:
sezero
2019-11-30 01:51:00 +03:00
committed by Ozkan Sezer
parent 5dfe0a4aa9
commit 0db60b18ad
1 changed files with 16 additions and 11 deletions
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27
src/memio.c
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@@ -69,24 +69,29 @@ size_t mread(void *buf, size_t size, size_t num, MFILE *m)
int mseek(MFILE *m, long offset, int whence)
{
ptrdiff_t ofs = offset;
switch (whence) {
default:
case SEEK_SET:
if (m->size >= 0 && (offset > m->size || offset < 0))
return -1;
m->pos = offset;
return 0;
break;
case SEEK_CUR:
if (m->size >= 0 && (offset > CAN_READ(m) || offset < -m->pos))
return -1;
m->pos += offset;
return 0;
ofs += m->pos;
break;
case SEEK_END:
if (m->size < 0)
return -1;
m->pos = m->size + offset;
return 0;
ofs += m->size;
break;
default:
return -1;
}
if (m->size >= 0) {
if (ofs < 0) return -1;
if (ofs > m->size)
ofs = m->size;
}
m->pos = ofs;
return 0;
}
long mtell(MFILE *m)