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