Mercurial > hg > octave-kai > gnulib-hg
changeset 364:d9031d3b5944
(safe_read): Get this function from gcc's cccp.c.
author | Jim Meyering <jim@meyering.net> |
---|---|
date | Sat, 10 Dec 1994 22:00:12 +0000 |
parents | ec4b36233380 |
children | dca9a1bd7ae4 |
files | lib/safe-read.c |
diffstat | 1 files changed, 23 insertions(+), 18 deletions(-) [+] |
line wrap: on
line diff
--- a/lib/safe-read.c +++ b/lib/safe-read.c @@ -31,30 +31,35 @@ extern int errno; #endif -/* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted. - Return the actual number of bytes read, zero for EOF, or negative - for an error. */ +/* Read LEN bytes at PTR from descriptor DESC, for file FILENAME, + retrying if necessary. 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. */ -int + The canonical source for this function is in the gcc distribution + in file cccp.c. So don't make any changes here. */ + +static int safe_read (desc, ptr, len) int desc; char *ptr; int len; { - int n_chars; - - if (len <= 0) - return len; - + int left = len; + while (left > 0) { + int nchars = read (desc, ptr, left); + if (nchars < 0) + { #ifdef EINTR - do - { - n_chars = read (desc, ptr, len); - } - while (n_chars < 0 && errno == EINTR); -#else - n_chars = read (desc, ptr, len); + if (errno == EINTR) + continue; #endif - - return n_chars; + return nchars; + } + if (nchars == 0) + break; + ptr += nchars; + left -= nchars; + } + return len - left; }