value.c

嵌入式Linux系统用的web server,开源代码,非常好用

		else return 1;

	case hex:
	case integer:
	case octal:
		if (v1.value.integer < v2.value.integer)
			return -1;
		else if (v1.value.integer == v2.value.integer)
			return 0;
		else return 1;

	case big:
		return bcompare(v1.value.big, v2.value.big);

	default:
		a_assert(0);
		return 0;
	}
}


/******************************************************************************/
/*
 *	If type mismatch, then coerce types to big.
 *	Note: Known bug, casting of negative bigs to floats doesn't work.
 */

static void coerce_types(register value_t* v1, register value_t* v2)
{
#ifdef FLOATING_POINT_SUPPORT
	if (v1->type == floating) {
		v2->type = floating;
		v2->value.floating = (double) v2->value.integer;
		if (v2->type == big)
			v2->value.floating = (double) v2->value.big[BLOW] +
				(double) v2->value.big[BHIGH] * (double) MAXINT;

	} else if (v2->type == floating) {
		v1->type = floating;
		v1->value.floating = (double) v1->value.integer;
		if (v1->type == big)
			v1->value.floating = (double) v1->value.big[BLOW] +
				(double) v1->value.big[BHIGH] * (double) MAXINT;

	} else if (v1->type == big) {
#else
	if (v1->type == big) {
#endif /* FLOATING_POINT_SUPPORT */
		v2->value.big[BLOW] = value_to_integer(v2);
		if (valueNegative(v2))
			v2->value.big[BHIGH] = -1;
		else
			v2->value.big[BHIGH] = 0;
		v2->type = big;

	} else if (v2->type == big) {
		if (valueNegative(v1))
			v1->value.big[BHIGH] = -1;
		else
			v1->value.big[BHIGH] = 0;
		v1->value.big[BLOW] = value_to_integer(v1);
		v1->type = big;


	} else if (v1->type == integer) {
		v2->value.integer = value_to_integer(v2);
		v2->type = integer;

	} else if (v2->type == integer) {
		v1->value.integer = value_to_integer(v1);
		v1->type = integer;

	} else if (v1->type != integer) {
		v2->type = v1->type;

	} else if (v2->type != integer) {
		v1->type = v2->type;

	}
	a_assert(v1->type == v2->type);
}


/******************************************************************************/
/*
 *	Return true if the value is numeric and negative. Otherwise return 0.
 */

int valueNegative(value_t* vp)
{
	switch (vp->type) {
	default:
	case string:
	case bytes:
		return 0;

#ifdef FLOATING_POINT_SUPPORT
	case floating:
		if (vp->value.floating < 0)
			return 1;
		return 0;
#endif

	case flag:
		if ((signed char)vp->value.flag < 0)
			return 1;
		return 0;

	case byteint:
	case percent:
		if ((signed char)vp->value.byteint < 0)
			return 1;
		return 0;

	case shortint:
		if (vp->value.shortint < 0)
			return 1;
		return 0;

	case hex:
	case integer:
	case octal:
		if (vp->value.integer < 0)
			return 1;
		return 0;

	case big:
		if (vp->value.big[BHIGH] < 0)
			return 1;
		return 0;
	}
}

/******************************************************************************/
/*
 *	Return true if the value is numeric and zero. Otherwise return 0.
 */

int valueZero(value_t* vp)
{
	switch (vp->type) {
	default:
	case string:
	case bytes:
		return 0;

#ifdef FLOATING_POINT_SUPPORT
	case floating:
		if (vp->value.floating == 0)
			return 1;
		return 0;
#endif

	case flag:
		if (vp->value.flag == 0)
			return 1;
		return 0;

	case byteint:
	case percent:
		if (vp->value.byteint == 0)
			return 1;
		return 0;

	case shortint:
		if (vp->value.shortint == 0)
			return 1;
		return 0;

	case hex:
	case integer:
	case octal:
		if (vp->value.integer == 0)
			return 1;
		return 0;

	case big:
		if (vp->value.big[BHIGH] == 0 && vp->value.big[BLOW] == 0)
			return 1;
		return 0;
	}
}


/******************************************************************************/
/*
 *	Cast a value to an integer. Cannot be called for floating, non-numerics
 *	or bigs.
 */

static int value_to_integer(value_t* vp)
{
	switch (vp->type) {
	default:
	case string:
	case bytes:
	case big:
#ifdef FLOATING_POINT_SUPPORT
	case floating:
		a_assert(0);
		return -1;
#endif

	case flag:
		return (int) vp->value.flag;

	case byteint:
	case percent:
		return (int) vp->value.byteint;

	case shortint:
		return (int) vp->value.shortint;

	case hex:
	case integer:
	case octal:
		return (int) vp->value.integer;
	}
}


/******************************************************************************/
/*
 *	Convert a value to a text based representation of its value
 */

void valueSprintf(char_t** out, int size, char_t* fmt, value_t vp)
{
	char_t		*src, *dst, *tmp, *dst_start;

	a_assert(out);

	*out = NULL;

	if (! vp.valid) {
		*out = bstrdup(B_L, T("Invalid"));
		return;
	}

	switch (vp.type) {
	case flag:
		if (fmt == NULL || *fmt == '\0') {
			*out = bstrdup(B_L, (vp.value.flag) ? T("true") : T("false"));
		} else {
			fmtAlloc(out, size, fmt, (vp.value.flag) ? T("true") : T("false"));
		}
		break;

#ifdef FLOATING_POINT_SUPPORT
	case floating:
		if (fmt == NULL || *fmt == '\0') {
			fmtAlloc(out, size, T("%f"), vp.value.floating);
		} else {
			fmtAlloc(out, size, fmt, vp.value.floating);
		}
		break;
#endif

	case hex:
		if (fmt == NULL || *fmt == '\0') {
			fmtAlloc(out, size, T("0x%lx"), vp.value.hex);
		} else {
			fmtAlloc(out, size, fmt, vp.value.hex);
		}
		break;

	case big:
		if (*out == NULL) {
			*out = btoa(vp.value.big, NULL, 0);
		} else {
			btoa(vp.value.big, *out, size);
		}
		break;

	case integer:
		if (fmt == NULL || *fmt == '\0') {
			fmtAlloc(out, size, T("%ld"), vp.value.integer);
		} else {
			fmtAlloc(out, size, fmt, vp.value.integer);
		}
		break;

	case octal:
		if (fmt == NULL || *fmt == '\0') {
			fmtAlloc(out, size, T("0%lo"), vp.value.octal);
		} else {
			fmtAlloc(out, size, fmt, vp.value.octal);
		}
		break;

	case percent:
		if (fmt == NULL || *fmt == '\0') {
			fmtAlloc(out, size, T("%d%%"), vp.value.percent);
		} else {
			fmtAlloc(out, size, fmt, vp.value.percent);
		}
		break;

	case byteint:
		if (fmt == NULL || *fmt == '\0') {
			fmtAlloc(out, size, T("%d"), (int) vp.value.byteint);
		} else {
			fmtAlloc(out, size, fmt, (int) vp.value.byteint);
		}
		break;

	case shortint:
		if (fmt == NULL || *fmt == '\0') {
			fmtAlloc(out, size, T("%d"), (int) vp.value.shortint);
		} else {
			fmtAlloc(out, size, fmt, (int) vp.value.shortint);
		}
		break;

	case string:
	case errmsg:
		src = vp.value.string;

		if (src == NULL) {
			*out = bstrdup(B_L, T("NULL"));
		} else if (fmt && *fmt) {
			fmtAlloc(out, size, fmt, src);

		} else {

			*out = balloc(B_L, size);
			dst_start = dst = *out;
			for (; *src != '\0'; src++) {
				if (dst >= &dst_start[VALUE_MAX_STRING - 5])
					break;
				switch (*src) {
				case '\a':	*dst++ = '\\';	*dst++ = 'a';		break;
				case '\b':	*dst++ = '\\';	*dst++ = 'b';		break;
				case '\f':	*dst++ = '\\';	*dst++ = 'f';		break;
				case '\n':	*dst++ = '\\';	*dst++ = 'n';		break;
				case '\r':	*dst++ = '\\';	*dst++ = 'r';		break;
				case '\t':	*dst++ = '\\';	*dst++ = 't';		break;
				case '\v':	*dst++ = '\\';	*dst++ = 'v';		break;
				case '\\':	*dst++ = '\\';	*dst++ = '\\';		break;
				case '"':	*dst++ = '\\';	*dst++ = '\"';		break;
				default:
					if (gisprint(*src)) {
						*dst++ = *src;
					} else {
						fmtAlloc(&tmp, size, T("\\x%02x"),
							(unsigned int) *src);
						gstrcpy(dst, tmp);
						bfreeSafe(B_L, tmp);
						dst += 4;
					}
					break;
				}
			}
			*dst++ = '\0';
		}
		break;

#ifdef UNUSED
	case bytes:
		asrc = vp.value.bytes;

		if (asrc == NULL) {
			*out = bstrdup(B_L, T("NULL"));

		} else if (fmt && *fmt) {
			fmtAlloc(out, size, fmt, asrc);

		} else {

			dst_start = dst;
			for (; *asrc != '\0'; asrc++) {
				if (dst >= &dst_start[VALUE_MAX_STRING - 5])
					break;
				switch (*asrc) {
				case '\a':	*dst++ = '\\';	*dst++ = 'a';		break;
				case '\b':	*dst++ = '\\';	*dst++ = 'b';		break;
				case '\f':	*dst++ = '\\';	*dst++ = 'f';		break;
				case '\n':	*dst++ = '\\';	*dst++ = 'n';		break;
				case '\r':	*dst++ = '\\';	*dst++ = 'r';		break;
				case '\t':	*dst++ = '\\';	*dst++ = 't';		break;
				case '\v':	*dst++ = '\\';	*dst++ = 'v';		break;
				case '\\':	*dst++ = '\\';	*dst++ = '\\';		break;
				case '"':	*dst++ = '\\';	*dst++ = '\"';		break;
				default:
					if (gisprint(*asrc)) {
						*dst++ = *asrc;
					} else {
						fmtAlloc(dst, size,
							T("\\x%02x"), (unsigned int) *asrc);
						dst += 4;
					}
					break;
				}
			}
			*dst++ = '\0';
		}
		break;
#endif

	default:
		a_assert(0);
	}
}

/******************************************************************************/
/*
 *	Print a value to the named file descriptor
 */

void valueFprintf(FILE* fp, char_t* fmt, value_t vp)
{
	char_t	*buf;

	buf = NULL;
	valueSprintf(&buf, VALUE_MAX_STRING, fmt, vp);
	gfputs(buf, fp);
	bfreeSafe(B_L, buf);
	fflush(fp);
}

/******************************************************************************/
/*
 *	Ascii to value conversion
 */

value_t valueAtov(char_t* s, int pref_type)
{
	vtype_t	type;
	value_t			v;
	long			tmp[2], tmp2[2], base[2];
	int				i, len, num;

	a_assert(0 <= pref_type && pref_type < 99);		/* Sanity check */
	a_assert(s);

	v = value_null;
	if (s == NULL) {
		return value_null;
	}

	base[BLOW] = 10;
	base[BHIGH] = 0;
	len = gstrlen(s);

/*
 *	Determine the value type
 */
	type = undefined;
	if (pref_type <= 0) {
		if (gisdigit(*s)) {
			base[BHIGH] = 0;
			if (s[len - 1] == '%') {
				type = percent;
				len --;
				base[BLOW] = 10;
			} else if (*s == '0') {
				if (s[1] == 'x') {
					type = hex;
					s += 2;
					len -= 2;
					base[BLOW] = 16;
				} else if (s[1] == '\0') {
					type = integer;
					base[BLOW] = 10;
				} else {
					type = octal;
					s++;
					len--;
					base[BLOW] = 8;
				}
			} else {
				type = integer;
				base[BLOW] = 10;
			}

		} else {
			if (gstrcmp(s, T("true")) == 0 || gstrcmp(s, T("false")) == 0) {
				type = flag;
			} else if (*s == '\'' && s[len - 1] == '\'') {
				type = string;
				s++;
				len -= 2;
			} else if (*s == '\"' && s[len - 1] == '\"') {
				type = string;
				s++;
				len -= 2;
			} else {
				type = string;
			}
		}
		v.type = type;

	} else
		v.type = pref_type;
	v.valid = 1;

/*
 *	Do the conversion. Always use big arithmetic
 */
	switch (v.type) {
	case hex:
		if (!isdigit(s[0])) {
			if (gtolower(s[0]) >= 'a' || gtolower(s[0]) <= 'f') {
				v.value.big[BLOW] = 10 + gtolower(s[0]) - 'a';
			} else {
				v.value.big[BLOW] = 0;
			}
		} else {
			v.value.big[BLOW] = s[0] - '0';
		}
		v.value.big[BHIGH] = 0;
		for (i = 1; i < len; i++) {
			if (!isdigit(s[i])) {
				if (gtolower(s[i]) < 'a' || gtolower(s[i]) > 'f') {
					break;
				}
				num = 10 + gtolower(s[i]) - 'a';
			} else {
				num = s[i] - '0';
			}
			bmul(tmp, v.value.big, base);
			binit(tmp2, 0, num);
			badd(v.value.big, tmp, tmp2);
		}
		v.value.hex = v.value.big[BLOW];
		break;

	case shortint:
	case byteint:
	case integer:
	case percent:
	case octal:
	case big:
		v.value.big[BHIGH] = 0;
		if (gisdigit(s[0]))
			v.value.big[BLOW] = s[0] - '0';
		else
			v.value.big[BLOW] = 0;
		for (i = 1; i < len && gisdigit(s[i]); i++) {
			bmul(tmp, v.value.big, base);
			binit(tmp2, 0, s[i] - '0');
			badd(v.value.big, tmp, tmp2);
		}
		switch (v.type) {
		case shortint:
			v.value.shortint = (short) v.value.big[BLOW];
			break;
		case byteint:
			v.value.byteint = (char) v.value.big[BLOW];
			break;
		case integer:
			v.value.integer = (int) v.value.big[BLOW];
			break;
		case percent:
			v.value.percent = (char) v.value.big[BLOW];
			break;
		case octal:
			v.value.octal = (int) v.value.big[BLOW];
			break;
		default:
			break;
		}
		break;

#ifdef FLOATING_POINT_SUPPORT
	case floating:
		gsscanf(s, T("%f"), &v.value.floating);
		break;
#endif

	case flag:
		if (*s == 't')
			v.value.flag = 1;
		else v.value.flag = 0;
		break;

	case string:
/*
 *		Note this always ballocs a string
 */
		v = valueString(s, VALUE_ALLOCATE);
		break;

	case bytes:
		v = valueBytes((char*) s, VALUE_ALLOCATE);
		break;

#ifdef UNUSED
	case literal:
		v = value_literal(bstrdup(B_L, s));
		v.value.literal[len] = '\0';
		break;
#endif

	case undefined:
	case symbol:
	default:
		v.valid = 0;
		a_assert(0);
	}
	return v;
}

#endif /* !UEMF */
/******************************************************************************/