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(safe_read): If MAX_READ_LEN is defined, limit incremental read 

attempts to that amount.

From-SVN: r14093
This commit is contained in:
Richard Kenner 1997-05-18 13:49:41 -04:00
parent 9b7311fe5f
commit e83dc357c3
1 changed files with 11 additions and 3 deletions
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14
gcc/cpplib.c
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@ -7197,7 +7197,8 @@ file_size_and_mode (fd, mode_pointer, size_pointer)
}
/* Read LEN bytes at PTR from descriptor DESC, for file FILENAME,
retrying if necessary. Return a negative value if an error occurs,
retrying if necessary. If MAX_READ_LEN is defined, read at most
that bytes at a time. Return a negative value if an error occurs,
otherwise return the actual number of bytes read,
which must be LEN unless end-of-file was reached. */
@ -7207,9 +7208,16 @@ safe_read (desc, ptr, len)
char *ptr;
int len;
{
int left = len;
int left, rcount, nchars;
left = len;
while (left > 0) {
int nchars = read (desc, ptr, left);
rcount = left;
#ifdef MAX_READ_LEN
if (rcount > MAX_READ_LEN)
rcount = MAX_READ_LEN;
#endif
nchars = read (desc, ptr, rcount);
if (nchars < 0)
{
#ifdef EINTR