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/*
* Utility routines.
*
* Licensed under GPLv2 or later, see file COPYING in this tarball for details.
*/
#include "libreport.h"
/* Die with an error message if we can't read the entire buffer. */
void xread(int fd, void *buf, size_t count)
{
if (count)
{
ssize_t size = full_read(fd, buf, count);
if ((size_t)size != count)
error_msg_and_die("short read");
}
}
ssize_t safe_read(int fd, void *buf, size_t count)
{
ssize_t n;
do {
n = read(fd, buf, count);
} while (n < 0 && errno == EINTR);
return n;
}
ssize_t safe_write(int fd, const void *buf, size_t count)
{
ssize_t n;
do {
n = write(fd, buf, count);
} while (n < 0 && errno == EINTR);
return n;
}
ssize_t full_read(int fd, void *buf, size_t len)
{
ssize_t cc;
ssize_t total;
total = 0;
while (len)
{
cc = safe_read(fd, buf, len);
if (cc < 0)
{
if (total)
{
/* we already have some! */
/* user can do another read to know the error code */
return total;
}
return cc; /* read() returns -1 on failure. */
}
if (cc == 0)
break;
buf = ((char *)buf) + cc;
total += cc;
len -= cc;
}
return total;
}
ssize_t full_write(int fd, const void *buf, size_t len)
{
ssize_t cc;
ssize_t total;
total = 0;
while (len)
{
cc = safe_write(fd, buf, len);
if (cc < 0)
{
if (total)
{
/* we already wrote some! */
/* user can do another write to know the error code */
return total;
}
return cc; /* write() returns -1 on failure. */
}
total += cc;
buf = ((const char *)buf) + cc;
len -= cc;
}
return total;
}
ssize_t full_write_str(int fd, const char *buf)
{
return full_write(fd, buf, strlen(buf));
}
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