source: trunk/minix/lib/stdio/tmpnam.c@ 12

/*
 * tmpnam.c - create a unique filename
 */
/* $Header: /cvsup/minix/src/lib/stdio/tmpnam.c,v 1.1.1.1 2005/04/21 14:56:36 beng Exp $ */

#if     defined(_POSIX_SOURCE)
#include        <sys/types.h>
#endif
#include        <stdio.h>
#include        <string.h>
#include        "loc_incl.h"

pid_t _getpid(void);

char *
tmpnam(char *s) {
        static char name_buffer[L_tmpnam] = "/tmp/tmp.";
        static unsigned long count = 0;
        static char *name = NULL;

        if (!name) { 
                name = name_buffer + strlen(name_buffer);
                name = _i_compute((unsigned long)_getpid(), 10, name, 5);
                *name++ = '.';
                *name = '\0';
        }
        if (++count > TMP_MAX) count = 1;       /* wrap-around */
        *_i_compute(count, 10, name, 3) = '\0';
        if (s) return strcpy(s, name_buffer);
        else return name_buffer;
}