Commit | Line | Data |
---|---|---|
39423523 DD |
1 | /* |
2 | ||
3 | @deftypefn Supplemental char* tmpnam (char *@var{s}) | |
4 | ||
5 | This function attempts to create a name for a temporary file, which | |
6 | will be a valid file name yet not exist when @code{tmpnam} checks for | |
7 | it. @var{s} must point to a buffer of at least @code{L_tmpnam} bytes, | |
99b58139 | 8 | or be @code{NULL}. Use of this function creates a security risk, and it must |
39423523 DD |
9 | not be used in new projects. Use @code{mkstemp} instead. |
10 | ||
11 | @end deftypefn | |
12 | ||
13 | */ | |
14 | ||
252b5132 RH |
15 | #include <stdio.h> |
16 | ||
17 | #ifndef L_tmpnam | |
e2eaf477 | 18 | #define L_tmpnam 100 |
252b5132 RH |
19 | #endif |
20 | #ifndef P_tmpdir | |
21 | #define P_tmpdir "/usr/tmp" | |
22 | #endif | |
23 | ||
24 | static char tmpnam_buffer[L_tmpnam]; | |
25 | static int tmpnam_counter; | |
26 | ||
27 | extern int getpid (); | |
28 | ||
29 | char * | |
30 | tmpnam (s) | |
31 | char *s; | |
32 | { | |
33 | int pid = getpid (); | |
34 | ||
35 | if (s == NULL) | |
36 | s = tmpnam_buffer; | |
37 | ||
38 | /* Generate the filename and make sure that there isn't one called | |
39 | it already. */ | |
40 | ||
41 | while (1) | |
42 | { | |
43 | FILE *f; | |
44 | sprintf (s, "%s/%s%x.%x", P_tmpdir, "t", pid, tmpnam_counter); | |
45 | f = fopen (s, "r"); | |
46 | if (f == NULL) | |
47 | break; | |
48 | tmpnam_counter++; | |
49 | fclose (f); | |
50 | } | |
51 | ||
52 | return s; | |
53 | } |