Function js_printf_internal

deps/quickjs/quickjs-libc.c:235–449

__GNUC__ || __clang__

#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif // __GNUC__ || __clang__
static JSValue js_printf_internal(JSContext *ctx,
                                  int argc, JSValueConst *argv, FILE *fp)
{
    char fmtbuf[32];
    uint8_t cbuf[UTF8_CHAR_LEN_MAX+1];
    JSValue res;
    DynBuf dbuf;
    const char *fmt_str = NULL;
    const uint8_t *fmt, *fmt_end;
    const uint8_t *p;
    char *q;
    int i, c, len, mod;
    size_t fmt_len;
    int32_t int32_arg;
    int64_t int64_arg;
    double double_arg;
    const char *string_arg;

    js_std_dbuf_init(ctx, &dbuf);

    if (argc > 0) {
        fmt_str = JS_ToCStringLen(ctx, &fmt_len, argv[0]);
        if (!fmt_str)
            goto fail;

        i = 1;
        fmt = (const uint8_t *)fmt_str;
        fmt_end = fmt + fmt_len;
        while (fmt < fmt_end) {
            for (p = fmt; fmt < fmt_end && *fmt != '%'; fmt++)
                continue;
            dbuf_put(&dbuf, p, fmt - p);
            if (fmt >= fmt_end)
                break;
            q = fmtbuf;
            *q++ = *fmt++;  /* copy '%' */

            /* flags */
            for(;;) {
                c = *fmt;
                if (c == '0' || c == '#' || c == '+' || c == '-' || c == ' ' ||
                    c == '\'') {
                    if (q >= fmtbuf + sizeof(fmtbuf) - 1)
                        goto invalid;
                    *q++ = c;
                    fmt++;
                } else {
                    break;
                }
            }
            /* width */
            if (*fmt == '*') {
                if (i >= argc)
                    goto missing;
                if (JS_ToInt32(ctx, &int32_arg, argv[i++]))
                    goto fail;
                q += snprintf(q, fmtbuf + sizeof(fmtbuf) - q, "%d", int32_arg);
                fmt++;