[f40a309] | 1 | /*
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| 2 | =============================================================================
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| 3 | cminit.c -- C-Meta parser functions
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| 4 | Version 5 -- 1987-07-10 -- D.N. Lynx Crowe
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| 5 |
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| 6 | Some parser functions in C, modelled after HyperMeta(tm).
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| 7 | Designed for, but not dedicated to, LR(k), top-down, recursive parsing.
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| 8 | =============================================================================
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| 9 | */
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| 10 |
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[b28a12e] | 11 | #include "ram.h"
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[e225e77] | 12 |
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[f40a309] | 13 | #define CM_DBLK if (!QQanch) while (*QQip EQ ' ') ++QQip
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| 14 |
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[7258c6a] | 15 | int16_t QQsw; /* parser result switch */
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| 16 | int16_t QQanch; /* parser anchored match switch */
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[f40a309] | 17 |
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[7258c6a] | 18 | int8_t *QQin; /* parser initial input pointer */
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| 19 | int8_t *QQip; /* parser current input pointer */
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| 20 | int8_t *QQop; /* parser string output pointer */
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[f40a309] | 21 |
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[7258c6a] | 22 | int32_t QQnum; /* parser numeric result */
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| 23 | int16_t QQlnum; /* parser list element number result */
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| 24 | int8_t QQdig; /* parser digit result */
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| 25 | int8_t QQchr; /* parser character result */
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[f40a309] | 26 |
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[7258c6a] | 27 | int8_t QQstr[CM_MXSTR]; /* parser string result */
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[f40a309] | 28 |
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| 29 | /* |
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| 30 |
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| 31 | */
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| 32 |
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| 33 | /*
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| 34 | =============================================================================
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| 35 | CMinit(ip) -- initialize the parser to work on the string at 'ip'.
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| 36 | =============================================================================
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| 37 | */
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[7258c6a] | 38 |
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[f40a309] | 39 | void CMinit(int8_t *ip)
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[7258c6a] | 40 | {
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| 41 | register int16_t i;
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[f40a309] | 42 | register int8_t *t;
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| 43 |
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| 44 | QQip = ip;
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| 45 | QQin = ip;
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| 46 | QQsw = TRUE;
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| 47 | QQanch = FALSE;
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| 48 | QQdig = '?';
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| 49 | QQchr = '?';
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| 50 | QQnum = 0;
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| 51 | QQop = QQstr;
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| 52 | t = QQstr;
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| 53 |
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| 54 | for (i = 0; i < CM_MXSTR; i++)
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| 55 | *t++ = '\0';
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| 56 | }
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| 57 |
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| 58 | /* |
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| 59 |
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| 60 | */
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| 61 |
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| 62 | /*
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| 63 | =============================================================================
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| 64 | CMchr(c) -- attempt to match character 'c' in the input.
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| 65 | =============================================================================
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[7258c6a] | 66 | */
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[f40a309] | 67 |
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| 68 | int16_t CMchr(int8_t c)
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| 69 | {
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| 70 | CM_DBLK;
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| 71 |
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| 72 | if (c NE *QQip)
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| 73 | return(QQsw = FALSE);
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| 74 |
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| 75 | QQchr = *QQip++;
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| 76 | return(QQsw = TRUE);
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| 77 | }
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| 78 |
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| 79 | /* |
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| 80 |
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| 81 | */
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| 82 |
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| 83 | /*
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| 84 | =============================================================================
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| 85 | CMuchr(c) -- attempt to match character 'c' in the input, ignoring case.
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[7258c6a] | 86 | =============================================================================
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[f40a309] | 87 | */
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[7258c6a] | 88 |
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[f40a309] | 89 | int16_t CMuchr(int8_t c)
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| 90 | {
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| 91 | register int8_t t;
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| 92 |
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| 93 | CM_DBLK;
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| 94 |
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| 95 | t = *QQip;
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| 96 |
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| 97 | if (isascii(c))
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| 98 | if (isupper(c))
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| 99 | c = _tolower(c);
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| 100 |
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| 101 | if (isascii(t))
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| 102 | if (isupper(t))
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| 103 | t = _tolower(t);
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| 104 |
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| 105 | if (c NE t)
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| 106 | return(QQsw = FALSE);
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| 107 |
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| 108 | QQchr = *QQip++;
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| 109 | return(QQsw = TRUE);
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| 110 | }
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| 111 |
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| 112 | /* |
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| 113 |
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| 114 | */
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| 115 |
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| 116 | /*
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| 117 | =============================================================================
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[7258c6a] | 118 | CMstr(s) -- attempt to match string at 's' in the input.
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[f40a309] | 119 | =============================================================================
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[7258c6a] | 120 | */
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| 121 |
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[f40a309] | 122 | int16_t CMstr(int8_t *s)
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| 123 | {
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| 124 | register int8_t *t;
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| 125 | int8_t *q;
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| 126 |
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| 127 | CM_DBLK;
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| 128 |
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| 129 | t = QQip;
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| 130 | q = s;
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| 131 |
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| 132 | while (*s) {
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| 133 |
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| 134 | if (*t++ NE *s++)
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| 135 | return(QQsw = FALSE);
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| 136 | }
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| 137 |
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| 138 | QQop = QQstr;
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| 139 |
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| 140 | while (*QQop++ = *q++) ;
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| 141 |
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| 142 | QQip = t;
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| 143 | return(QQsw = TRUE);
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| 144 | }
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| 145 |
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| 146 | /* |
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| 147 |
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| 148 | */
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| 149 |
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| 150 | /*
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[7258c6a] | 151 | =============================================================================
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[f40a309] | 152 | CMustr(s) -- attempt to match string 's' in the input, ignoring case.
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[7258c6a] | 153 | =============================================================================
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| 154 | */
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[f40a309] | 155 |
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| 156 | int16_t CMustr(int8_t *s)
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| 157 | {
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| 158 | register int8_t *t, t1, t2;
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| 159 | int8_t *q;
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| 160 |
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| 161 | CM_DBLK;
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| 162 |
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| 163 | t = QQip;
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| 164 | q = s;
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| 165 |
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| 166 | while (*s) {
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| 167 |
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| 168 | t1 = *t++;
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| 169 | t2 = *s++;
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| 170 |
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| 171 | if (isascii(t1))
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| 172 | if (isupper(t1))
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| 173 | t1 = _tolower(t1);
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| 174 |
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| 175 | if (isascii(t2))
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| 176 | if (isupper(t2))
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| 177 | t2 = _tolower(t2);
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| 178 |
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| 179 | if (t1 NE t2)
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| 180 | return(QQsw = FALSE);
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| 181 | }
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| 182 |
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| 183 | QQop = QQstr;
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| 184 |
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| 185 | while (*QQop++ = *q++) ;
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| 186 |
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| 187 | QQip = t;
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| 188 | return(QQsw = TRUE);
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| 189 | }
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| 190 |
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| 191 | /* |
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| 192 |
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| 193 | */
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| 194 |
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[7258c6a] | 195 | /*
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[f40a309] | 196 | =============================================================================
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[7258c6a] | 197 | CMlong() -- attempt to parse a digit string in the input as a long.
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| 198 | =============================================================================
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| 199 | */
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[f40a309] | 200 |
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| 201 | int16_t CMlong(void)
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| 202 | {
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| 203 | register int8_t *p;
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| 204 | register int32_t n;
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| 205 | register int8_t c;
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| 206 |
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| 207 | CM_DBLK;
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| 208 |
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| 209 | p = QQip;
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| 210 | n = 0L;
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| 211 | c = *p++;
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| 212 |
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| 213 | if (!isascii(c))
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[9519422] | 214 | return(QQsw = FALSE);
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[f40a309] | 215 |
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| 216 | if (!isdigit(c))
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| 217 | return(QQsw = FALSE);
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| 218 |
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| 219 | n = c - '0';
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| 220 |
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| 221 | while (c = *p) {
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| 222 |
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| 223 | if (!isascii(c))
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| 224 | break;
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| 225 |
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| 226 | if (!isdigit(c))
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| 227 | break;
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| 228 |
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| 229 | n = (n * 10) + (c - '0');
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| 230 | ++p;
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| 231 | }
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| 232 |
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| 233 | QQip = p;
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| 234 | QQnum = n;
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| 235 | return(QQsw = TRUE);
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| 236 | }
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| 237 |
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| 238 | /* |
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| 239 |
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| 240 | */
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[7258c6a] | 241 |
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[f40a309] | 242 | /*
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[7258c6a] | 243 | =============================================================================
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[f40a309] | 244 | CMdig() -- attempt to match a digit in the input string.
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| 245 | =============================================================================
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| 246 | */
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| 247 |
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| 248 | int16_t CMdig(void)
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| 249 | {
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| 250 | register int8_t c;
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| 251 |
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| 252 | CM_DBLK;
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| 253 |
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| 254 | c = *QQip;
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| 255 |
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| 256 | if (!isascii(c))
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| 257 | return(QQsw = FALSE);
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| 258 |
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| 259 | if (!isdigit(c))
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| 260 | return(QQsw = FALSE);
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| 261 |
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| 262 | QQdig = c;
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| 263 | ++QQip;
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| 264 | return(QQsw = TRUE);
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| 265 | }
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| 266 |
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| 267 | /* |
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| 268 |
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[7258c6a] | 269 | */
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[f40a309] | 270 |
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[7258c6a] | 271 | /*
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| 272 | =============================================================================
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[f40a309] | 273 | CMlist(l) -- attempt to match a string from the list 'l' in the input.
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| 274 | =============================================================================
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| 275 | */
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| 276 |
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| 277 | int16_t CMlist(int8_t *l[])
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| 278 | {
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| 279 | register int16_t n;
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| 280 | register int8_t *p, *q;
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| 281 |
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| 282 | CM_DBLK;
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| 283 |
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| 284 | n = 0;
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| 285 |
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| 286 | while (p = *l++) {
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| 287 |
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| 288 | q = p;
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| 289 |
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| 290 | if (CMstr(p)) {
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| 291 |
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| 292 | QQop = QQstr;
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| 293 |
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| 294 | while (*QQop++ = *q++) ;
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| 295 |
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| 296 | QQlnum = n;
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| 297 | return(QQsw = TRUE);
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| 298 | }
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| 299 |
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| 300 | ++n;
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| 301 | }
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| 302 |
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| 303 | return(QQsw = FALSE);
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| 304 | }
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| 305 |
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| 306 | /* |
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| 307 |
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[7258c6a] | 308 | */
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[f40a309] | 309 |
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[7258c6a] | 310 | /*
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| 311 | =============================================================================
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[f40a309] | 312 | CMulist(l) -- attempt to match a string from the list 'l' in the input
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| 313 | ignoring case in both the list and the input string.
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| 314 | =============================================================================
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| 315 | */
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| 316 |
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| 317 | int16_t CMulist(int8_t *l[])
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| 318 | {
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| 319 | register int16_t n;
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| 320 | register int8_t *p, *q;
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| 321 |
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| 322 | CM_DBLK;
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| 323 |
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| 324 | n = 0;
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| 325 |
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| 326 | while (p = *l++) {
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| 327 |
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| 328 | q = p;
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| 329 |
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| 330 | if (CMustr(p)) {
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| 331 |
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| 332 | QQop = QQstr;
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| 333 |
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| 334 | while (*QQop++ = *q++) ;
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| 335 |
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| 336 | QQlnum = n;
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| 337 | return(QQsw = TRUE);
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| 338 | }
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| 339 |
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| 340 | ++n;
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| 341 | }
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| 342 |
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| 343 | return(QQsw = FALSE);
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| 344 | }
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| 345 |
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[7258c6a] | 346 | /* |
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[f40a309] | 347 |
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[7258c6a] | 348 | */
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[f40a309] | 349 |
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| 350 | /*
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| 351 | =============================================================================
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| 352 | CMstat(msg) -- output 'msg and dump parser status. Returns QQsw.
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| 353 | =============================================================================
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| 354 | */
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| 355 |
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| 356 | int16_t CMstat(int8_t *msg)
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| 357 | {
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| 358 | register int8_t *tp;
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| 359 |
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| 360 | tp = QQin;
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| 361 | printf("%s\r\n", msg);
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| 362 | printf(" QQsw: %s, QQanch: %s, QQchr: 0x%02x <%c>, QQdig: %c\r\n",
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| 363 | (QQsw ? "OK" : "NOGO"), (QQanch ? "anchored" : "deblanked"),
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| 364 | QQchr, (isascii(QQchr) ? (isprint(QQchr) ? QQchr : ' ') : ' '),
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| 365 | QQdig);
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| 366 | printf(" QQnum: %ld, QQlnum: %d\r\n", QQnum, QQlnum);
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[6262b5c] | 367 | printf(" QQstr: %s\r\n", QQstr);
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| 368 | printf(" {%s}\r\n", QQin);
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| 369 | printf(" ");
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| 370 |
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| 371 | while (tp++ NE QQip)
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| 372 | printf(" ");
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| 373 |
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| 374 | printf("^\r\n");
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| 375 | return(QQsw);
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| 376 | }
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| 377 |
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