116 lines
5.0 KiB
C
116 lines
5.0 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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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/pushpop.h"
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#include "libc/bits/safemacros.h"
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#include "libc/runtime/internal.h"
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#include "libc/str/appendchar.h"
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#include "libc/str/str.h"
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#include "libc/str/tpenc.h"
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/* TODO(jart): Make early-stage data structures happen. */
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#undef isspace
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#undef iswspace
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#define isspace(c) ((c) == ' ' || (c) == '\t' || (c) == '\n' || (c) == '\r')
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#define iswspace(c) isspace(c)
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struct DosArgv {
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const char16_t *s;
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char *p;
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char *pe;
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wint_t wc;
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};
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static textwindows void decodedosargv(struct DosArgv *st) {
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st->s += getutf16(st->s, &st->wc);
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}
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static textwindows void appenddosargv(struct DosArgv *st, wint_t wc) {
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AppendChar(&st->p, st->pe, wc);
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}
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/**
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* Tokenizes and transcodes Windows NT CLI args, thus avoiding
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* CommandLineToArgv() schlepping in forty megs of dependencies.
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*
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* @param s is the command line string provided by the executive
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* @param buf is where we'll store double-NUL-terminated decoded args
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* @param size is how many bytes are available in buf
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* @param argv is where we'll store the decoded arg pointer array, which
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* is guaranteed to be NULL-terminated if max>0
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* @param max specifies the item capacity of argv, or 0 to do scanning
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* @return number of args written, excluding the NULL-terminator; or,
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* if the output buffer wasn't passed, or was too short, then the
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* number of args that *would* have been written is returned; and
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* there are currently no failure conditions that would have this
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* return -1 since it doesn't do system calls
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* @see test/libc/dosarg_test.c
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* @see libc/runtime/ntspawn.c
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* @note kudos to Simon Tatham for figuring out quoting behavior
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*/
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textwindows int getdosargv(const char16_t *cmdline, char *buf, size_t size,
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char **argv, size_t max) {
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bool inquote;
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size_t i, argc, slashes, quotes;
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struct DosArgv st;
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st.s = cmdline;
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st.p = buf;
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st.pe = buf + size;
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argc = 0;
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decodedosargv(&st);
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while (st.wc) {
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while (st.wc && iswspace(st.wc)) decodedosargv(&st);
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if (!st.wc) break;
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if (++argc < max) {
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argv[argc - 1] = st.p < st.pe ? st.p : NULL;
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}
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inquote = false;
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while (st.wc) {
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if (!inquote && isspace(st.wc)) break;
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if (st.wc == '"' || st.wc == '\\') {
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slashes = 0;
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quotes = 0;
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while (st.wc == '\\') decodedosargv(&st), slashes++;
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while (st.wc == '"') decodedosargv(&st), quotes++;
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if (!quotes) {
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while (slashes--) appenddosargv(&st, '\\');
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} else {
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while (slashes >= 2) appenddosargv(&st, '\\'), slashes -= 2;
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if (slashes) appenddosargv(&st, '"'), quotes--;
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if (quotes > 0) {
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if (!inquote) quotes--;
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for (i = 3; i <= quotes + 1; i += 3) appenddosargv(&st, '"');
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inquote = (quotes % 3 == 0);
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}
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}
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} else {
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appenddosargv(&st, st.wc);
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decodedosargv(&st);
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}
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}
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appenddosargv(&st, '\0');
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}
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appenddosargv(&st, '\0');
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if (size) buf[min(st.p - buf, size - 1)] = '\0';
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if (max) argv[min(argc, max - 1)] = NULL;
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return argc;
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}
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