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Replace use of memmove() with a simple copy for portability.

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SunOS 4.1 doesn't have memmove(), and there may be others.  memcpy()
should not be used for overlapping copies, so here a simple copy is
implemented that works for the particular direction of the overlap,
which is where the destination precedes the source.
This commit is contained in:
Mark Adler 2012-02-18 08:19:59 -08:00
parent 455adc3029
commit d1714a57c5
1 changed files with 8 additions and 3 deletions
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11
gzread.c
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@ -57,8 +57,13 @@ local int gz_avail(state)
if (state->err != Z_OK && state->err != Z_BUF_ERROR)
return -1;
if (state->eof == 0) {
if (strm->avail_in)
memmove(state->in, strm->next_in, strm->avail_in);
if (strm->avail_in) { /* copy what's there to the start */
unsigned char *p = state->in, *q = strm->next_in;
unsigned n = strm->avail_in;
do {
*p++ = *q++;
} while (--n);
}
if (gz_load(state, state->in + strm->avail_in,
state->size - strm->avail_in, &got) == -1)
return -1;
@ -340,7 +345,7 @@ int ZEXPORT gzread(file, buf, len)
/* get more output, looking for header if required */
if (gz_fetch(state) == -1)
return -1;
continue; /* no progress yet -- go back to memcpy() above */
continue; /* no progress yet -- go back to copy above */
/* the copy above assures that we will leave with space in the
output buffer, allowing at least one gzungetc() to succeed */
}