1 | /* ctype.c */
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2 |
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3 | /* This file contains the tables and initialization function for elvis'
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4 | * version of <ctype.h>. It should be portable.
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5 | */
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6 |
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7 | #include "config.h"
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8 | #include "ctype.h"
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9 |
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10 | uchar _ct_toupper[256];
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11 | uchar _ct_tolower[256];
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12 | uchar _ct_ctypes[256];
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13 |
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14 | /* This function initializes the tables used by the ctype macros. It should
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15 | * be called at the start of the program. It can be called again anytime you
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16 | * wish to change the non-standard "flipcase" list. The "flipcase" list is
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17 | * a string of characters which are taken to be lowercase/uppercase pairs.
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18 | * If you don't want to use any special flipcase characters, then pass an
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19 | * empty string.
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20 | */
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21 | void _ct_init(flipcase)
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22 | uchar *flipcase; /* list of non-standard lower/upper letter pairs */
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23 | {
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24 | int i;
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25 | uchar *scan;
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26 |
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27 | /* reset all of the tables */
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28 | for (i = 0; i < 256; i++)
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29 | {
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30 | _ct_toupper[i] = _ct_tolower[i] = i;
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31 | _ct_ctypes[i] = 0;
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32 | }
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33 |
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34 | /* add the digits */
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35 | for (scan = (uchar *)"0123456789"; *scan; scan++)
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36 | {
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37 | _ct_ctypes[*scan] |= _CT_DIGIT | _CT_ALNUM;
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38 | }
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39 |
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40 | /* add the whitespace */
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41 | for (scan = (uchar *)" \t\n\r\f"; *scan; scan++)
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42 | {
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43 | _ct_ctypes[*scan] |= _CT_SPACE;
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44 | }
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45 |
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46 | /* add the standard ASCII letters */
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47 | for (scan = (uchar *)"aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ"; *scan; scan += 2)
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48 | {
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49 | _ct_ctypes[scan[0]] |= _CT_LOWER | _CT_ALNUM;
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50 | _ct_ctypes[scan[1]] |= _CT_UPPER | _CT_ALNUM;
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51 | _ct_toupper[scan[0]] = scan[1];
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52 | _ct_tolower[scan[1]] = scan[0];
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53 | }
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54 |
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55 | /* add the flipcase letters */
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56 | for (scan = flipcase; scan[0] && scan[1]; scan += 2)
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57 | {
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58 | _ct_ctypes[scan[0]] |= _CT_LOWER | _CT_ALNUM;
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59 | _ct_ctypes[scan[1]] |= _CT_UPPER | _CT_ALNUM;
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60 | _ct_toupper[scan[0]] = scan[1];
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61 | _ct_tolower[scan[1]] = scan[0];
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62 | }
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63 |
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64 | /* include '_' in the isalnum() list */
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65 | _ct_ctypes[UCHAR('_')] |= _CT_ALNUM;
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66 |
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67 | /* !!! find the control characters in an ASCII-dependent way */
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68 | for (i = 0; i < ' '; i++)
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69 | {
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70 | _ct_ctypes[i] |= _CT_CNTRL;
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71 | }
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72 | _ct_ctypes[127] |= _CT_CNTRL;
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73 | _ct_ctypes[255] |= _CT_CNTRL;
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74 | }
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