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sbase/libutil/writeall.c
Michael Forney 5cb3a1eba1 libutil: Add writeall utility function
writeall makes successive write calls to write an entire buffer to the
output file descriptor. It returns the number of bytes written, or -1 on
the first error.
2017-07-03 21:04:12 +02:00

22 lines
318 B
C

/* See LICENSE file for copyright and license details. */
#include <unistd.h>
#include "../util.h"
ssize_t
writeall(int fd, const void *buf, size_t len)
{
const char *p = buf;
ssize_t n;
while (len) {
n = write(fd, p, len);
if (n <= 0)
return n;
p += n;
len -= n;
}
return p - (const char *)buf;
}