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