Trailing-Edge
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PDP-10 Archives
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SRI_NIC_PERM_FS_1_19910112
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c/lib5/stdio/tmpnam.c
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/*
* TMPNAM - create a unique temporary file name
*
* This code conforms with the description of the tmpnam()
* function in the ANSI X3J11 C language standard, section
* 4.9.4.4
*
* Copyright (c) 1986 by Ian Macky, SRI International
*/
#include "c-env.h"
#include "stdio.h"
#include "time.h"
#include "sys/file.h" /* For access() */
char *
tmpnam(s)
char *s;
{
#if SYS_T20+SYS_10X
static char tmpbuf[L_tmpnam]; /* storage for filename */
static int newver = 0;
int i;
if (!s) s = tmpbuf; /* if they didn't supply a buf, use ours */
if (newver == 0)
newver = (int)time(0) & 0777; /* Get random non-neg start seed */
for (i = 0; i < TMP_MAX; ++i) { /* Avoid infinite loop, just in case */
sprintf(s, "TMPNAM-%o.TMP.%d", getpid(), ++newver);
if (access(s, F_OK) != 0) /* Check for existence */
return s; /* Doesn't exist, win. */
}
return NULL; /* Failed... */
#else
#error tmpnam() not implemented for this system.
#endif
}