85 lines
4.0 KiB
C
85 lines
4.0 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/errno.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/time/time.h"
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#include "third_party/musl/tempnam.h"
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#define MAXTRIES 100
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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static char *__randname(char *template) {
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int i;
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struct timespec ts;
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unsigned long r;
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clock_gettime(CLOCK_REALTIME, &ts);
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r = ts.tv_nsec * 65537 ^ (uintptr_t)&ts / 16 + (uintptr_t) template;
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for (i = 0; i < 6; i++, r >>= 5) template[i] = 'A' + (r & 15) + (r & 16) * 2;
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return template;
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}
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/**
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* Creates name for temporary file.
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*/
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char *tempnam(const char *dir, const char *pfx) {
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int i, r;
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char s[PATH_MAX];
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size_t l, dl, pl;
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if (!dir) dir = kTmpPath;
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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 (i = 0; i < MAXTRIES; i++) {
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__randname(s + l - 6);
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r = fstatat(AT_FDCWD, s, &(struct stat){0}, AT_SYMLINK_NOFOLLOW);
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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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