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/*
 * misc.c -- Miscellaneous routines.
 *
 * Copyright (c) GoAhead Software Inc., 1995-1999. All Rights Reserved.
 *
 * See the file "license.txt" for usage and redistribution license requirements
 */
 
/********************************* Includes ***********************************/
 
#if UEMF
	#include	"uemf.h"
#else
	#include	"basic/basicInternal.h"
#endif
 
/********************************* Defines ************************************/
/*
 *	Sprintf buffer structure. Make the increment 8 less than 64 so that
 *	a balloc can use a 64 byte block.
 */
 
#define STR_REALLOC		0x1				/* Reallocate the buffer as required */
#define STR_INC			58				/* Growth increment */
 
typedef struct {
	char_t	*s;							/* Pointer to buffer */
	int		size;						/* Current buffer size */
	int		max;						/* Maximum buffer size */
	int		count;						/* Buffer count */
	int		flags;						/* Allocation flags */
} strbuf_t;
 
/*
 *	Sprintf formatting flags
 */
enum flag {
	flag_none = 0,
	flag_minus = 1,
	flag_plus = 2,
	flag_space = 4,
	flag_hash = 8,
	flag_zero = 16,
	flag_short = 32,
	flag_long = 64
};
 
/************************** Forward Declarations ******************************/
 
static int 	dsnprintf(char_t **s, int size, char_t *fmt, va_list arg,
				int msize);
static int	strnlen(char_t *s, unsigned int n);
static void	put_char(strbuf_t *buf, char_t c);
static void	put_string(strbuf_t *buf, char_t *s, int len,
				int width, int prec, enum flag f);
static void	put_ulong(strbuf_t *buf, unsigned long int value, int base,
				int upper, char_t *prefix, int width, int prec, enum flag f);
 
/************************************ Code ************************************/
/*
 *	"basename" returns a pointer to the last component of a pathname
 *  LINUX, RTEMS, and LynxOS have their own basename function
 */
 
#if ! LINUX & ! __rtems__ & ! LYNX
char_t *basename(char_t* name)
{
	char_t	*cp;
 
#if NW || WIN
	if (((cp = gstrrchr(name, '\\')) == NULL) &&
			((cp = gstrrchr(name, '/')) == NULL)) {
		return name;
#else
	if ((cp = gstrrchr(name, '/')) == NULL) {
		return name;
#endif
	} else if (*(cp + 1) == '\0' && cp == name) {
		return name;
	} else if (*(cp + 1) == '\0' && cp != name) {
		return T("");
	} else {
		return ++cp;
	}
}
#endif /* ! LINUX && ! __rtems__ && ! LYNX */
 
/******************************************************************************/
/*
 *	Returns a pointer to the directory component of a pathname. bufsize is
 *	the size of the buffer in BYTES!
 */
 
char_t *dirname(char_t* buf, char_t* name, int bufsize)
{
	char_t*	cp;
	int		len;
 
	a_assert(name);
	a_assert(buf);
	a_assert(bufsize > 0);
 
#if WIN || NW
	if ((cp = gstrrchr(name, '/')) == NULL && 
		(cp = gstrrchr(name, '\\')) == NULL)
#else
	if ((cp = gstrrchr(name, '/')) == NULL)
#endif
	{
		gstrcpy(buf, T("."));
		return buf;
	}
 
	if ((*(cp + 1) == '\0' && cp == name)) {
		gstrncpy(buf, T("."), TSZ(bufsize));
		gstrcpy(buf, T("."));
		return buf;
	}
 
	len = cp - name;
 
	if (len < bufsize) {
		gstrncpy(buf, name, len);
		buf[len] = '\0';
	} else {
		gstrncpy(buf, name, TSZ(bufsize));
		buf[bufsize - 1] = '\0';
	}
 
	return buf;
}
 
/******************************************************************************/
/*
 *	sprintf and vsprintf are bad, ok. You can easily clobber memory. Use
 *	gsnprintf and gvsnprintf instead! These functions do _not_ support floating
 *	point, like %e, %f, %g...
 */
 
int gsnprintf(char_t **s, int n, char_t *fmt, ...)
{
	va_list	ap;
	int		result;
 
	a_assert(s);
	a_assert(fmt);
 
	*s = NULL;
	va_start(ap, fmt);
	result = gvsnprintf(s, n, fmt, ap);
	va_end(ap);
	return result;
}
 
/******************************************************************************/
/*
 *	This function appends the formatted string to the supplied string,
 *	reallocing if required.
 */
 
int gsprintfRealloc(char_t **s, int n, int msize, char_t *fmt, ...)
{
	va_list	ap;
	int		result;
 
	a_assert(s);
	a_assert(fmt);
 
	if (msize == -1) {
		*s = NULL;
	}
	va_start(ap, fmt);
	result = dsnprintf(s, n, fmt, ap, msize);
	va_end(ap);
	return result;
}
 
/******************************************************************************/
/*
 *	A vsprintf replacement.
 */
 
int gvsnprintf(char_t **s, int n, char_t *fmt, va_list arg)
{
	a_assert(s);
	a_assert(fmt);
 
	return dsnprintf(s, n, fmt, arg, 0);
}
 
/******************************************************************************/
/*
 *	Dynamic sprintf implementation. Supports dynamic buffer allocation also.
 *	This function can be called multiple times to grow an existing allocated
 *	buffer. In this case, msize is set to the size of the previously allocated
 *	buffer. The buffer will be realloced, as required. If msize is set, we
 *	return the size of the allocated buffer for use with the next call. For
 *	the first call, msize can be set to -1.
 */
 
static int dsnprintf(char_t **s, int size, char_t *fmt, va_list arg, int msize)
{
	strbuf_t	buf;
	char_t		c;
 
	a_assert(s);
	a_assert(fmt);
 
	memset(&buf, 0, sizeof(buf));
	buf.s = *s;
 
	if (*s == NULL || msize != 0) {
		buf.max = size;
		buf.flags |= STR_REALLOC;
		if (msize != 0) {
			buf.size = max(msize, 0);
		}
		if (*s != NULL && msize != 0) {
			buf.count = gstrlen(*s);
		}
	} else {
		buf.size = size;
	}
 
	while ((c = *fmt++) != '\0') {
		if (c != '%' || (c = *fmt++) == '%') {
			put_char(&buf, c);
		} else {
			enum flag f = flag_none;
			int width = 0;
			int prec = -1;
			for ( ; c != '\0'; c = *fmt++) {
				if (c == '-') { 
					f |= flag_minus; 
				} else if (c == '+') { 
					f |= flag_plus; 
				} else if (c == ' ') { 
					f |= flag_space; 
				} else if (c == '#') { 
					f |= flag_hash; 
				} else if (c == '0') { 
					f |= flag_zero; 
				} else {
					break;
				}
			}
			if (c == '*') {
				width = va_arg(arg, int);
				if (width < 0) {
					f |= flag_minus;
					width = -width;
				}
				c = *fmt++;
			} else {
				for ( ; gisdigit(c); c = *fmt++) {
					width = width * 10 + (c - '0');
				}
			}
			if (c == '.') {
				f &= ~flag_zero;
				c = *fmt++;
				if (c == '*') {
					prec = va_arg(arg, int);
					c = *fmt++;
				} else {
					for (prec = 0; gisdigit(c); c = *fmt++) {
						prec = prec * 10 + (c - '0');
					}
				}
			}
			if (c == 'h' || c == 'l') {
				f |= (c == 'h' ? flag_short : flag_long);
				c = *fmt++;
			}
			if (c == 'd' || c == 'i') {
				long int value;
				if (f & flag_short) {
					value = (short int) va_arg(arg, int);
				} else if (f & flag_long) {
					value = va_arg(arg, long int);
				} else {
					value = va_arg(arg, int);
				}
				if (value >= 0) {
					if (f & flag_plus) {
						put_ulong(&buf, value, 10, 0, T("+"), width, prec, f);
					} else if (f & flag_space) {
						put_ulong(&buf, value, 10, 0, T(" "), width, prec, f);
					} else {
						put_ulong(&buf, value, 10, 0, NULL, width, prec, f);
					}
				} else {
					put_ulong(&buf, -value, 10, 0, T("-"), width, prec, f);
				}
			} else if (c == 'o' || c == 'u' || c == 'x' || c == 'X') {
				unsigned long int value;
				if (f & flag_short) {
					value = (unsigned short int) va_arg(arg, unsigned int);
				} else if (f & flag_long) {
					value = va_arg(arg, unsigned long int);
				} else {
					value = va_arg(arg, unsigned int);
				}
				if (c == 'o') {
					if (f & flag_hash && value != 0) {
						put_ulong(&buf, value, 8, 0, T("0"), width, prec, f);
					} else {
						put_ulong(&buf, value, 8, 0, NULL, width, prec, f);
					}
				} else if (c == 'u') {
					put_ulong(&buf, value, 10, 0, NULL, width, prec, f);
				} else {
					if (f & flag_hash && value != 0) {
						if (c == 'x') {
							put_ulong(&buf, value, 16, 0, T("0x"), width, 
								prec, f);
						} else {
							put_ulong(&buf, value, 16, 1, T("0X"), width, 
								prec, f);
						}
					} else {
						put_ulong(&buf, value, 16, 0, NULL, width, prec, f);
					}
				}
 
			} else if (c == 'c') {
				char_t value = va_arg(arg, int);
				put_char(&buf, value);
 
			} else if (c == 's' || c == 'S') {
				char_t *value = va_arg(arg, char_t *);
				if (value == NULL) {
					put_string(&buf, T("(null)"), -1, width, prec, f);
				} else if (f & flag_hash) {
					put_string(&buf,
						value + 1, (char_t) *value, width, prec, f);
				} else {
					put_string(&buf, value, -1, width, prec, f);
				}
			} else if (c == 'p') {
				void *value = va_arg(arg, void *);
				put_ulong(&buf,
					(unsigned long int) value, 16, 0, T("0x"), width, prec, f);
			} else if (c == 'n') {
				if (f & flag_short) {
					short int *value = va_arg(arg, short int *);
					*value = buf.count;
				} else if (f & flag_long) {
					long int *value = va_arg(arg, long int *);
					*value = buf.count;
				} else {
					int *value = va_arg(arg, int *);
					*value = buf.count;
				}
			} else {
				put_char(&buf, c);
			}
		}
	}
	if (buf.s == NULL) {
		put_char(&buf, '\0');
	}
 
/*
 *	If the user requested a dynamic buffer (*s == NULL), ensure it is returned.
 */
	if (*s == NULL || msize != 0) {
		*s = buf.s;
	}
 
	if (*s != NULL && size > 0) {
		if (buf.count < size) {
			(*s)[buf.count] = '\0';
		} else {
			(*s)[buf.size - 1] = '\0';
		}
	}
 
	if (msize != 0) {
		return buf.size;
	}
	return buf.count;
}
 
/******************************************************************************/
/*
 *	Return the length of a string limited by a given length
 */
 
static int strnlen(char_t *s, unsigned int n)
{
	unsigned int 	len;
 
	len = gstrlen(s);
	return min(len, n);
}
 
/******************************************************************************/
/*
 *	Add a character to a string buffer
 */
 
static void put_char(strbuf_t *buf, char_t c)
{
	if (buf->count >= buf->size) {
		if (! (buf->flags & STR_REALLOC)) {
			return;
		}
		buf->size += STR_INC;
		if (buf->size > buf->max && buf->size > STR_INC) {
			a_assert(buf->size <= buf->max);
			buf->size -= STR_INC;
			return;
		}
		if (buf->s == NULL) {
			buf->s = balloc(B_L, buf->size * sizeof(char_t*));
		} else {
			buf->s = brealloc(B_L, buf->s, buf->size * sizeof(char_t*));
		}
	}
	buf->s[buf->count] = c;
	++buf->count;
}
 
/******************************************************************************/
/*
 *	Add a string to a string buffer
 */
 
static void put_string(strbuf_t *buf, char_t *s, int len, int width,
	int prec, enum flag f)
{
	int		i;
 
	if (len < 0) { 
		len = strnlen(s, prec >= 0 ? prec : ULONG_MAX); 
	} else if (prec >= 0 && prec < len) { 
		len = prec; 
	}
	if (width > len && !(f & flag_minus)) {
		for (i = len; i < width; ++i) { 
			put_char(buf, ' '); 
		}
	}
	for (i = 0; i < len; ++i) { 
		put_char(buf, s[i]); 
	}
	if (width > len && f & flag_minus) {
		for (i = len; i < width; ++i) { 
			put_char(buf, ' '); 
		}
	}
}
 
/******************************************************************************/
/*
 *	Add a long to a string buffer
 */
 
static void put_ulong(strbuf_t *buf, unsigned long int value, int base,
	int upper, char_t *prefix, int width, int prec, enum flag f)
{
	unsigned long	x, x2;
	int				len, zeros, i;
 
	for (len = 1, x = 1; x < ULONG_MAX / base; ++len, x = x2) {
		x2 = x * base;
		if (x2 > value) { 
			break; 
		}
	}
	zeros = (prec > len) ? prec - len : 0;
	width -= zeros + len;
	if (prefix != NULL) { 
		width -= strnlen(prefix, ULONG_MAX); 
	}
	if (!(f & flag_minus)) {
		for (i = 0; i < width; ++i) { 
			put_char(buf, ' '); 
		}
	}
	if (prefix != NULL) { 
		put_string(buf, prefix, -1, 0, -1, flag_none); 
	}
	for (i = 0; i < zeros; ++i) { 
		put_char(buf, '0'); 
	}
	for ( ; x > 0; x /= base) {
		int digit = (value / x) % base;
		put_char(buf, (char) ((digit < 10 ? '0' : (upper ? 'A' : 'a') - 10) +
			digit));
	}
	if (f & flag_minus) {
		for (i = 0; i < width; ++i) { 
			put_char(buf, ' '); 
		}
	}
}
 
/******************************************************************************/
/*
 *	Convert an ansi string to a unicode string. On an error, we return the
 * 	original ansi string which is better than returning NULL. nBytes is the
 *	size of the destination buffer (ubuf) in _bytes_.
 */
 
char_t *ascToUni(char_t *ubuf, char *str, int nBytes)
{
#if UNICODE
	if (MultiByteToWideChar(CP_ACP, 0, str, nBytes / sizeof(char_t), ubuf,
			nBytes / sizeof(char_t)) < 0) {
		return (char_t*) str;
	}
#else
	memcpy(ubuf, str, nBytes);
#endif
	return ubuf;
}
 
/******************************************************************************/
/*
 *	Convert a unicode string to an ansi string. On an error, return the
 *	original unicode string which is better than returning NULL.
 *	N.B. nBytes is the number of _bytes_ in the destination buffer, buf.
 */
 
char *uniToAsc(char *buf, char_t* ustr, int nBytes)
{
#if UNICODE
	if (WideCharToMultiByte(CP_ACP, 0, ustr, nBytes, buf, nBytes, NULL,
			NULL) < 0) {
		return (char*) ustr;
	}
#else
	memcpy(buf, ustr, nBytes);
#endif
	return (char*) buf;
}
 
 
/******************************************************************************/
/*
 *	allocate (balloc) a buffer and do ascii to unicode conversion into it.
 *	cp points to the ascii string which must be NULL terminated.
 *	Return a pointer to the unicode buffer which must be bfree'd later.
 *	Return NULL on failure to get buffer.
 */
char_t *ballocAscToUni(char * cp)
{
	char_t * unip;
	int ulen;
 
	ulen = (strlen(cp) + 1) * sizeof(char_t);
	if ((unip = balloc(B_L, ulen)) == NULL) {
		return NULL;
	}
	ascToUni(unip, cp, ulen);
	return unip;
}
 
/******************************************************************************/
/*
 *	allocate (balloc) a buffer and do unicode to ascii conversion into it.
 *	unip points to the unicoded string. ulen is the number of characters
 *	in the unicode string including teminating null, if there is one.
 *	Return a pointer to the ascii buffer which must be bfree'd later.
 *	Return NULL on failure to get buffer.
 */
char *ballocUniToAsc(char_t * unip, int ulen)
{
	char * cp;
 
	if ((cp = balloc(B_L, ulen)) == NULL) {
		return NULL;
	}
	uniToAsc(cp, unip, ulen);
	return cp;
}
 
/******************************************************************************/