1 | /*- |
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2 | * Copyright (c) 1990 The Regents of the University of California. |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms are permitted |
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6 | * provided that the above copyright notice and this paragraph are |
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7 | * duplicated in all such forms and that any documentation, |
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8 | * advertising materials, and other materials related to such |
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9 | * distribution and use acknowledge that the software was developed |
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10 | * by the University of California, Berkeley. The name of the |
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11 | * University may not be used to endorse or promote products derived |
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12 | * from this software without specific prior written permission. |
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13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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16 | */ |
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17 | |
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18 | /* Split from vfscanf.c */ |
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19 | |
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20 | #include <_ansi.h> |
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21 | #include <reent.h> |
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22 | #include <newlib.h> |
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23 | #include <stdio.h> |
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24 | #include "local.h" |
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25 | |
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26 | /* |
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27 | * Fill in the given table from the scanset at the given format |
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28 | * (just after `['). Return a pointer to the character past the |
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29 | * closing `]'. The table has a 1 wherever characters should be |
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30 | * considered part of the scanset. |
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31 | */ |
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32 | |
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33 | u_char * |
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34 | __sccl (register char *tab, |
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35 | register u_char *fmt) |
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36 | { |
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37 | register int c, n, v; |
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38 | |
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39 | /* first `clear' the whole table */ |
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40 | c = *fmt++; /* first char hat => negated scanset */ |
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41 | if (c == '^') |
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42 | { |
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43 | v = 1; /* default => accept */ |
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44 | c = *fmt++; /* get new first char */ |
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45 | } |
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46 | else |
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47 | v = 0; /* default => reject */ |
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48 | /* should probably use memset here */ |
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49 | for (n = 0; n < 256; n++) |
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50 | tab[n] = v; |
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51 | if (c == 0) |
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52 | return fmt - 1; /* format ended before closing ] */ |
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53 | |
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54 | /* |
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55 | * Now set the entries corresponding to the actual scanset to the |
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56 | * opposite of the above. |
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57 | * |
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58 | * The first character may be ']' (or '-') without being special; the |
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59 | * last character may be '-'. |
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60 | */ |
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61 | |
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62 | v = 1 - v; |
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63 | for (;;) |
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64 | { |
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65 | tab[c] = v; /* take character c */ |
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66 | doswitch: |
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67 | n = *fmt++; /* and examine the next */ |
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68 | switch (n) |
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69 | { |
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70 | |
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71 | case 0: /* format ended too soon */ |
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72 | return fmt - 1; |
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73 | |
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74 | case '-': |
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75 | /* |
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76 | * A scanset of the form [01+-] is defined as `the digit 0, the |
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77 | * digit 1, the character +, the character -', but the effect of a |
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78 | * scanset such as [a-zA-Z0-9] is implementation defined. The V7 |
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79 | * Unix scanf treats `a-z' as `the letters a through z', but treats |
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80 | * `a-a' as `the letter a, the character -, and the letter a'. |
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81 | * |
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82 | * For compatibility, the `-' is not considerd to define a range if |
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83 | * the character following it is either a close bracket (required by |
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84 | * ANSI) or is not numerically greater than the character we just |
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85 | * stored in the table (c). |
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86 | */ |
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87 | n = *fmt; |
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88 | if (n == ']' || n < c) |
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89 | { |
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90 | c = '-'; |
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91 | break; /* resume the for(;;) */ |
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92 | } |
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93 | fmt++; |
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94 | do |
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95 | { /* fill in the range */ |
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96 | tab[++c] = v; |
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97 | } |
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98 | while (c < n); |
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99 | #if 1 /* XXX another disgusting compatibility hack */ |
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100 | /* |
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101 | * Alas, the V7 Unix scanf also treats formats such |
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102 | * as [a-c-e] as `the letters a through e'. This too |
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103 | * is permitted by the standard.... |
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104 | */ |
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105 | goto doswitch; |
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106 | #else |
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107 | c = *fmt++; |
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108 | if (c == 0) |
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109 | return fmt - 1; |
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110 | if (c == ']') |
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111 | return fmt; |
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112 | #endif |
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113 | |
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114 | break; |
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115 | |
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116 | |
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117 | case ']': /* end of scanset */ |
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118 | return fmt; |
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119 | |
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120 | default: /* just another character */ |
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121 | c = n; |
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122 | break; |
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123 | } |
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124 | } |
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125 | /* NOTREACHED */ |
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126 | } |
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