53 lines
1 KiB
C
53 lines
1 KiB
C
|
/*
|
||
|
|
|
||
|
|
@deftypefn Supplemental char* tmpnam (char *@var{s})
|
||
|
|
|
||
|
|
This function attempts to create a name for a temporary file, which
|
||
|
|
will be a valid file name yet not exist when @code{tmpnam} checks for
|
||
|
|
it. @var{s} must point to a buffer of at least @code{L_tmpnam} bytes,
|
||
|
|
or be @code{NULL}. Use of this function creates a security risk, and it must
|
||
|
|
not be used in new projects. Use @code{mkstemp} instead.
|
||
|
|
|
||
|
|
@end deftypefn
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#ifndef L_tmpnam
|
||
|
|
#define L_tmpnam 100
|
||
|
|
#endif
|
||
|
|
#ifndef P_tmpdir
|
||
|
|
#define P_tmpdir "/usr/tmp"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static char tmpnam_buffer[L_tmpnam];
|
||
|
|
static int tmpnam_counter;
|
||
|
|
|
||
|
|
extern int getpid (void);
|
||
|
|
|
||
|
|
char *
|
||
|
|
tmpnam (char *s)
|
||
|
|
{
|
||
|
|
int pid = getpid ();
|
||
|
|
|
||
|
|
if (s == NULL)
|
||
|
|
s = tmpnam_buffer;
|
||
|
|
|
||
|
|
/* Generate the filename and make sure that there isn't one called
|
||
|
|
it already. */
|
||
|
|
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
FILE *f;
|
||
|
|
sprintf (s, "%s/%s%x.%x", P_tmpdir, "t", pid, tmpnam_counter);
|
||
|
|
f = fopen (s, "r");
|
||
|
|
if (f == NULL)
|
||
|
|
break;
|
||
|
|
tmpnam_counter++;
|
||
|
|
fclose (f);
|
||
|
|
}
|
||
|
|
|
||
|
|
return s;
|
||
|
|
}
|