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Improve execve() path argument munging

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Munging of paths passed inside the system() interpreter command is no
longer supported. You have to pass your paths to posix_spawn() or the
execve() family of functions if you want them to be munged. The first
three characters must match `^/[a-z]/` in which case, it'll be turned
into a DOS-style drive path with backslashes.
This commit is contained in:
Justine Tunney 2023-11-17 09:54:11 -08:00
parent 529cb4817c
commit 32b97f2d25
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GPG key ID: BE714B4575D6E328
5 changed files with 88 additions and 78 deletions
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55
libc/calls/mungentpath.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2023 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/proc/ntspawn.h"
static inline int IsAlpha(int c) {
return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
}
textwindows void mungentpath(char *path) {
char *p;
// turn colon into semicolon
// unless it already looks like a dos path
for (p = path; *p; ++p) {
if (p[0] == ':' && p[1] != '\\') {
p[0] = ';';
}
}
// turn /c/... into c:\...
p = path;
if (p[0] == '/' && IsAlpha(p[1]) && p[2] == '/') {
p[0] = p[1];
p[1] = ':';
}
for (; *p; ++p) {
if (p[0] == ';' && p[1] == '/' && IsAlpha(p[2]) && p[3] == '/') {
p[1] = p[2];
p[2] = ':';
}
}
// turn slash into backslash
for (p = path; *p; ++p) {
if (*p == '/') {
*p = '\\';
}
}
}