Category : C Source Code
Archive   : WTWG12B.ZIP
Filename : WROWCOL.C

/*! wstrrowcol
*
* a 2-dimensional strlen() function, this routine computes the
* number of rows and columns needed to display a string.
*
* Assumptions: new lines are flagged with \n
* Lines do not wrap around the window edge.
* (routine may be used to compute size of next window)
*
* This routine will FAIL
* if the string contains embedded \t tab chars
* if the string is longer than the current window width
*
*
* parameters: text is ptr to a string.
* the number of rows and columns needed are placed in
* *rows, *cols.
* RETURN: void.
*/



#include "wsys.h"





void wstrrowcol (char *text, int *rows, int*cols )
{
int linecnt; /* #lines in text */
int longest; /* longest line in text */
int len;


char *ptr;
char *last_ptr;

/* 'normalize' the pointers (if the memory model requires it)
* so we can add to them without wrapping around
* segment boundaries
*/
_NORMALIZE (text);




/* count lines in text and size of largest line */

ptr = last_ptr = text;

linecnt = longest = 0;

while (NULL != (ptr = strchr (ptr+1, '\n')) )
{
++linecnt;

if ( longest < (int)(ptr - last_ptr) )
{
/* longest line so far */
longest = (int) (ptr - last_ptr);
}
last_ptr = ptr;
}

/*now look over the last line (or only line) for line length.
*/
len = strlen(last_ptr);
if ( longest < len )
{
longest = len;
}

*rows = linecnt;
*cols = longest;

return;
} /*end of wstrrowcol */