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#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void
set_bit(uint8_t *bits, unsigned long index)
{
bits[index / 8] |= (1 << (7 - index % 8));
}
void
clear_bit(uint8_t *bits, unsigned long index)
{
bits[index / 8] &= ~(1 << (7 - index % 8));
}
int
has_bit(const uint8_t *bits, unsigned long index)
{
return bits[index / 8] & (1 << (7 - index % 8));
}
int
set_nonblocking(int fd)
{
int oflags;
if ((oflags = fcntl(fd, F_GETFL, 0)) == -1)
return errno;
if (fcntl(fd, F_SETFL, oflags | O_NONBLOCK) == -1)
return errno;
return 0;
}
int
set_blocking(int fd)
{
int oflags;
if ((oflags = fcntl(fd, F_GETFL, 0)) == -1)
return errno;
if (fcntl(fd, F_SETFL, oflags & ~O_NONBLOCK) == -1)
return errno;
return 0;
}
int
mkdirs(char *path)
{
int err = 0;
char *spos = strchr(path + 1, '/'); // Must ignore the root
while (spos != NULL) {
*spos = '\0';
err = mkdir(path, 0777);
*spos = '/';
if (err != 0 && errno != EEXIST) {
err = errno;
break;
}
spos = strchr(spos + 1, '/');
}
return err;
}
int
vaopen(int *res, int flags, const char *fmt, va_list ap)
{
int fd, didmkdirs;
char path[PATH_MAX + 1];
if (vsnprintf(path, PATH_MAX, fmt, ap) >= PATH_MAX)
return ENAMETOOLONG;
didmkdirs = 0;
again:
fd = open(path, flags, 0666);
if (fd < 0 && errno == ENOENT && (flags & O_CREAT) != 0 && !didmkdirs) {
if (mkdirs(path) == 0) {
didmkdirs = 1;
goto again;
} else
return errno;
}
if (fd >= 0) {
*res = fd;
return 0;
} else
return errno;
}
int
vopen(int *res, int flags, const char *fmt, ...)
{
int err;
va_list ap;
va_start(ap, fmt);
err = vaopen(res, flags, fmt, ap);
va_end(ap);
return err;
}
int
vfsync(const char *fmt, ...)
{
int err, fd;
va_list ap;
va_start(ap, fmt);
err = vaopen(&fd, O_RDONLY, fmt, ap);
va_end(ap);
if (err != 0)
return err;
if (fsync(fd) < 0)
err = errno;
close(fd);
return err;
}
int
vfopen(FILE **ret, const char *mode, const char *fmt, ...)
{
int err = 0;
char path[PATH_MAX + 1];
va_list ap;
va_start(ap, fmt);
if (vsnprintf(path, PATH_MAX, fmt, ap) >= PATH_MAX)
err = ENAMETOOLONG;
va_end(ap);
if (err == 0)
if ((*ret = fopen(path, mode)) == NULL)
err = errno;
return err;
}
int
canon_path(const char *path, char **res)
{
char rp[PATH_MAX];
if (realpath(path, rp) == NULL)
return errno;
#if 0
// This could be necessary on solaris.
if (rp[0] != '/') {
char wd[MAXPATHLEN];
if (getcwd(wd, MAXPATHLEN) == NULL)
return errno;
if (strlcat(wd, "/", MAXPATHLEN) >= MAXPATHLEN)
return ENAMETOOLONG;
if (strlcat(wd, rp, MAXPATHLEN) >= MAXPATHLEN)
return ENAMETOOLONG;
strcpy(rp, wd);
}
#endif
if ((*res = strdup(rp)) == NULL)
return ENOMEM;
return 0;
}
long
rand_between(long min, long max)
{
return min + (long)rint((double)random() * (max - min) / RAND_MAX);
}
int
write_fully(int fd, const void *buf, size_t len)
{
ssize_t nw;
size_t off = 0;
while (off < len) {
nw = write(fd, buf + off, len - off);
if (nw == -1)
return errno;
off += nw;
}
return 0;
}
int
read_fully(int fd, void *buf, size_t len)
{
ssize_t nread;
size_t off = 0;
while (off < len) {
nread = read(fd, buf + off, len - off);
if (nread == 0)
return ECONNRESET;
else if (nread == -1)
return errno;
off += nread;
}
return 0;
}
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