mirror of
https://github.com/jart/cosmopolitan.git
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110559ce6a
This change improves the dirstream library in a lot of respects, especially for /zip/... files. Also turn off MAP_STACK on Aarch64 because Qemu seems to implement it differently than Linux and it's probably responsible for a lot of mysterious crashes.
80 lines
3.1 KiB
C
80 lines
3.1 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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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/runtime/zipos.internal.h"
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static size_t __zipos_trimpath(char *s, int *isabs) {
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char *p = s, *q = s;
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for (; *q; ++q) {
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if (*q == '/') {
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while (q[1] == '/') ++q;
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if (q[1] == '.' && (q[2] == '/' || q[2] == '\0')) {
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++q;
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} else {
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*p++ = '/';
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}
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} else {
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*p++ = *q;
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}
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}
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if (s < p && p[-1] == '.' && p[-2] == '.' && (p - 2 == s || p[-3] == '/')) {
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*p++ = '/';
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}
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*p = '\0';
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if (isabs) {
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*isabs = *s == '/';
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}
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return p - s;
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}
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size_t __zipos_normpath(char *s) {
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int isabs;
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char *p = s, *q = s;
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__zipos_trimpath(s, &isabs);
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if (!*s) return 0;
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for (; *q != '\0'; ++q) {
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if (q[0] == '/' && q[1] == '.' && q[2] == '.' &&
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(q[3] == '/' || q[3] == '\0')) {
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char *ep = p;
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while (s < ep && *--ep != '/') donothing;
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if (ep != p &&
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(p[-1] != '.' || p[-2] != '.' || (s < p - 3 && p[-3] != '/'))) {
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p = ep;
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q += 2;
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continue;
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} else if (ep == s && isabs) {
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q += 2;
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continue;
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}
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}
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if (q[0] != '/' || p != s || isabs) {
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*p++ = *q;
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}
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}
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if (p == s) {
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*p++ = isabs ? '/' : '.';
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}
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if (p == s + 1 && s[0] == '.') {
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*p++ = '/';
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}
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while (p - s > 1 && p[-1] == '/') {
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--p;
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}
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*p = '\0';
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return p - s;
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}
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