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