File: tmpnam.c

package info (click to toggle)
gdb 8.2.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 223,696 kB
  • sloc: ansic: 1,936,156; asm: 341,757; exp: 146,606; makefile: 56,749; sh: 23,776; cpp: 20,830; yacc: 12,914; perl: 5,331; ada: 4,977; python: 4,617; xml: 4,176; pascal: 3,134; lisp: 1,527; cs: 879; lex: 620; f90: 479; sed: 228; awk: 140; objc: 134; fortran: 43
file content (52 lines) | stat: -rw-r--r-- 1,038 bytes parent folder | download | duplicates (76)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
/*

@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;
}