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#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include "syscall.h"
#define MAXTRIES 100
char *tempnam(const char *dir, const char *pfx)
{
char s[PATH_MAX];
size_t l, dl, pl;
int try;
int r;
if (!dir) dir = P_tmpdir;
if (!pfx) pfx = "temp";
dl = strlen(dir);
pl = strlen(pfx);
l = dl + 1 + pl + 1 + 6;
if (l >= PATH_MAX) {
errno = ENAMETOOLONG;
return 0;
}
memcpy(s, dir, dl);
s[dl] = '/';
memcpy(s+dl+1, pfx, pl);
s[dl+1+pl] = '_';
s[l] = 0;
for (try=0; try<MAXTRIES; try++) {
__randname(s+l-6);
#ifdef SYS_readlink
r = __syscall(SYS_readlink, s, (char[1]){0}, 1);
#else
r = __syscall(SYS_readlinkat, AT_FDCWD, s, (char[1]){0}, 1);
#endif
if (r == -ENOENT) return strdup(s);
}
return 0;
}
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