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0
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1 /*
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2
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3 @deftypefn Supplemental char* tmpnam (char *@var{s})
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4
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5 This function attempts to create a name for a temporary file, which
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6 will be a valid file name yet not exist when @code{tmpnam} checks for
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7 it. @var{s} must point to a buffer of at least @code{L_tmpnam} bytes,
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8 or be @code{NULL}. Use of this function creates a security risk, and it must
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9 not be used in new projects. Use @code{mkstemp} instead.
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10
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11 @end deftypefn
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12
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13 */
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14
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15 #include <stdio.h>
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16
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17 #ifndef L_tmpnam
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18 #define L_tmpnam 100
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19 #endif
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20 #ifndef P_tmpdir
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21 #define P_tmpdir "/usr/tmp"
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22 #endif
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23
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24 static char tmpnam_buffer[L_tmpnam];
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25 static int tmpnam_counter;
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26
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27 extern int getpid (void);
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28
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29 char *
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30 tmpnam (char *s)
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31 {
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32 int pid = getpid ();
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33
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34 if (s == NULL)
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35 s = tmpnam_buffer;
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36
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37 /* Generate the filename and make sure that there isn't one called
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38 it already. */
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39
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40 while (1)
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41 {
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42 FILE *f;
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43 sprintf (s, "%s/%s%x.%x", P_tmpdir, "t", pid, tmpnam_counter);
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44 f = fopen (s, "r");
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45 if (f == NULL)
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46 break;
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47 tmpnam_counter++;
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48 fclose (f);
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49 }
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50
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51 return s;
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52 }
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