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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_300
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365_01
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ctype.c
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1992-04-06
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/* ctype.c */
/* This file contains the tables and initialization function for elvis'
* version of <ctype.h>. It should be portable.
*/
#include "config.h"
#include "ctype.h"
uchar _ct_toupper[256];
uchar _ct_tolower[256];
uchar _ct_ctypes[256];
/* This function initializes the tables used by the ctype macros. It should
* be called at the start of the program. It can be called again anytime you
* wish to change the non-standard "flipcase" list. The "flipcase" list is
* a string of characters which are taken to be lowercase/uppercase pairs.
* If you don't want to use any special flipcase characters, then pass an
* empty string.
*/
void _ct_init(flipcase)
uchar *flipcase; /* list of non-standard lower/upper letter pairs */
{
int i;
uchar *scan;
/* reset all of the tables */
for (i = 0; i < 256; i++)
{
_ct_toupper[i] = _ct_tolower[i] = i;
_ct_ctypes[i] = 0;
}
/* add the digits */
for (scan = (uchar *)"0123456789"; *scan; scan++)
{
_ct_ctypes[*scan] |= _CT_DIGIT | _CT_ALNUM;
}
/* add the whitespace */
for (scan = (uchar *)" \t\n\r\f"; *scan; scan++)
{
_ct_ctypes[*scan] |= _CT_SPACE;
}
/* add the standard ASCII letters */
for (scan = (uchar *)"aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ"; *scan; scan += 2)
{
_ct_ctypes[scan[0]] |= _CT_LOWER | _CT_ALNUM;
_ct_ctypes[scan[1]] |= _CT_UPPER | _CT_ALNUM;
_ct_toupper[scan[0]] = scan[1];
_ct_tolower[scan[1]] = scan[0];
}
/* add the flipcase letters */
for (scan = flipcase; scan[0] && scan[1]; scan += 2)
{
_ct_ctypes[scan[0]] |= _CT_LOWER | _CT_ALNUM;
_ct_ctypes[scan[1]] |= _CT_UPPER | _CT_ALNUM;
_ct_toupper[scan[0]] = scan[1];
_ct_tolower[scan[1]] = scan[0];
}
/* include '_' in the isalnum() list */
_ct_ctypes[UCHAR('_')] |= _CT_ALNUM;
/* !!! find the control characters in an ASCII-dependent way */
for (i = 0; i < ' '; i++)
{
_ct_ctypes[i] |= _CT_CNTRL;
}
_ct_ctypes[127] |= _CT_CNTRL;
_ct_ctypes[255] |= _CT_CNTRL;
}