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Reduce memory requirements for execve()

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This commit is contained in:
Justine Tunney 2021-01-29 22:00:10 -08:00
parent eaca5b3e81
commit 21e1023d28
7 changed files with 35 additions and 32 deletions
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18
libc/calls/mkntcmdline.c
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@ -30,24 +30,28 @@
* GetDosArgv() or GetDosArgv(). This function does NOT escape
* command interpreter syntax, e.g. $VAR (sh), %VAR% (cmd).
*
* @param cmdline is output buffer
* @param prog is used as argv[0]
* @param argv is an a NULL-terminated array of UTF-8 strings
* @return freshly allocated lpCommandLine or NULL w/ errno
* @kudos Daniel Colascione for teaching how to quote
* @see libc/runtime/dosargv.c
*/
textwindows int mkntcmdline(char16_t cmdline[ARG_MAX], char *const argv[]) {
textwindows int mkntcmdline(char16_t cmdline[ARG_MAX], const char *prog,
char *const argv[]) {
char *arg;
uint64_t w;
wint_t x, y;
int slashes, n;
size_t i, j, k;
bool needsquote;
char16_t cbuf[2];
for (k = i = 0; argv[i]; ++i) {
for (arg = prog, k = i = 0; arg; arg = argv[++i]) {
if (i) {
cmdline[k++] = u' ';
if (k == ARG_MAX) return e2big();
}
needsquote = !*argv[i] || argv[i][strcspn(argv[i], " \t\n\v\"")];
needsquote = !arg[0] || arg[strcspn(arg, " \t\n\v\"")];
if (needsquote) {
cmdline[k++] = u'"';
if (k == ARG_MAX) return e2big();
@ -55,20 +59,20 @@ textwindows int mkntcmdline(char16_t cmdline[ARG_MAX], char *const argv[]) {
for (j = 0;;) {
if (needsquote) {
slashes = 0;
while (argv[i][j] && argv[i][j] == '\\') slashes++, j++;
while (arg[j] && arg[j] == '\\') slashes++, j++;
slashes <<= 1;
if (argv[i][j] == '"') slashes++;
if (arg[j] == '"') slashes++;
while (slashes--) {
cmdline[k++] = u'\\';
if (k == ARG_MAX) return e2big();
}
}
x = argv[i][j++] & 0xff;
x = arg[j++] & 0xff;
if (x >= 0300) {
n = ThomPikeLen(x);
x = ThomPikeByte(x);
while (--n) {
if ((y = argv[i][j++] & 0xff)) {
if ((y = arg[j++] & 0xff)) {
x = ThomPikeMerge(x, y);
} else {
x = 0;