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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <getopt.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
char *progname;
void
usage (int status)
{
if (status)
fprintf(stderr, "Try `%s --help' for more information.\n", progname);
else
printf("Usage: %s [OPTION]\n\
Create a temporary file in a safe manner.
\n\
-d, --directory=DIR place temporary file in DIR\n\
-p, --prefix=STRING set temporary file's prefix to STRING\n\
-s, --suffix=STRING set temporary file's suffix to STRING\n\
-m, --mode=MODE open with MODE instead of 0600\n\
-n, --name=FILE use FILE instead of tempnam(3)\n\
--help display this help and exit\n\
--version output version information and exit\n", progname);
exit(status);
}
void
syserror (const char *fx)
{
perror(fx);
exit(1);
}
int
parsemode (const char *in, mode_t *out)
{
char *endptr;
long int mode;
mode = strtol(in, &endptr, 8);
if (*endptr || mode<0 || mode>07777)
return 1;
*out = (mode_t) mode;
return 0;
}
int
main (int argc, char **argv)
{
char *name=0, *dir=0, *pfx=0, *sfx=0;
mode_t mode = 0600;
int fd, optc;
struct option long_options[] = {
{"prefix", required_argument, 0, 'p'},
{"suffix", required_argument, 0, 's'},
{"directory", required_argument, 0, 'd'},
{"mode", required_argument, 0, 'm'},
{"name", required_argument, 0, 'n'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'v'},
{0, 0, 0, 0}
};
progname = argv[0];
while ((optc = getopt_long (argc, argv, "p:s:d:m:n:", long_options, 0))
!= EOF) {
switch (optc) {
case 0:
break;
case 'p':
pfx = optarg;
break;
case 's':
sfx = optarg;
break;
case 'd':
dir = optarg;
break;
case 'm':
if (parsemode(optarg, &mode)) {
fprintf(stderr, "Invalid mode `%s'. Mode must be octal.\n", optarg);
usage(1);
}
break;
case 'n':
name = optarg;
break;
case 'h':
usage(0);
case 'v':
puts("tempfile 1.0");
exit(0);
default:
usage(1);
}
}
if (name) {
if ((fd = open(name, O_RDWR | O_CREAT | O_EXCL, mode)) < 0)
syserror("open");
}
else {
for (;;) {
if (!(name = tempnam(dir, pfx)))
syserror("tempnam");
if ((fd = open(name, O_RDWR | O_CREAT | O_EXCL, mode)) < 0) {
if (errno == EEXIST) {
free(name);
continue;
}
syserror("open");
}
if (sfx) {
char *namesfx;
if (!(namesfx = malloc(strlen(name) + strlen(sfx) + 1)))
syserror("malloc");
strcpy(namesfx, name);
strcat(namesfx, sfx);
if (link(name, namesfx) < 0) {
if (errno == EEXIST) {
if (unlink(name) < 0)
syserror("unlink");
free(name);
free(namesfx);
continue;
}
syserror("link");
}
if (unlink(name) < 0)
syserror("unlink");
free(name);
name = namesfx;
}
break;
}
}
if (close(fd))
syserror("close");
puts(name);
exit(0);
}
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