Function parse_win_cmdline

tests/test_subprocess.c:185–239

Reference re-parser: the subset of CommandLineToArgvW our builder emits (every * arg quote-wrapped; \" for embedded quotes; backslashes doubled before a quote). */

/* Reference re-parser: the subset of CommandLineToArgvW our builder emits (every
 * arg quote-wrapped; \" for embedded quotes; backslashes doubled before a quote). */
static int parse_win_cmdline(const char *cmd, char out[][256], int max_args) {
    int argc = 0;
    const char *p = cmd;
    while (*p) {
        while (*p == ' ' || *p == '\t') {
            p++;
        }
        if (!*p || argc >= max_args) {
            break;
        }
        char *o = out[argc];
        size_t oi = 0;
        bool in_quotes = false;
        /* Guard every write: each out[] row is 256 bytes; test args stay well under
         * that, but cap defensively so a future longer arg fails a length assertion
         * rather than smashing the stack. */
#define PUTO(ch)            \
    do {                    \
        if (oi < 255) {     \
            o[oi++] = (ch); \
        }                   \
    } while (0)
        for (;;) {
            size_t nbs = 0;
            while (*p == '\\') {
                nbs++;
                p++;
            }
            if (*p == '"') {
                for (size_t k = 0; k < nbs / 2; k++) {
                    PUTO('\\');
                }
                if (nbs % 2) {
                    PUTO('"'); /* odd run → the quote is an escaped literal */
                } else {
                    in_quotes = !in_quotes; /* even run → the quote is a delimiter */
                }
                p++;
            } else {
                for (size_t k = 0; k < nbs; k++) {
                    PUTO('\\');
                }
                if (*p == '\0' || (!in_quotes && (*p == ' ' || *p == '\t'))) {
                    break;
                }
                PUTO(*p);
                p++;
            }
        }
#undef PUTO
        o[oi] = '\0';
        argc++;
    }
    return argc;
}

static bool cmdline_roundtrips(const char *const *argv) {
    char cmd[4096];