[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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[6262b5c] | 11 | #include "all.h"
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[e225e77] | 12 |
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[f40a309] | 13 | #define CM_MXSTR 257 /* maximum parser string result length */
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| 14 |
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| 15 | #define CM_DBLK if (!QQanch) while (*QQip EQ ' ') ++QQip
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| 16 |
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[7258c6a] | 17 | int16_t QQsw; /* parser result switch */
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| 18 | int16_t QQanch; /* parser anchored match switch */
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[f40a309] | 19 |
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[7258c6a] | 20 | int8_t *QQin; /* parser initial input pointer */
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| 21 | int8_t *QQip; /* parser current input pointer */
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| 22 | int8_t *QQop; /* parser string output pointer */
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[f40a309] | 23 |
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[7258c6a] | 24 | int32_t QQnum; /* parser numeric result */
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| 25 | int16_t QQlnum; /* parser list element number result */
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| 26 | int8_t QQdig; /* parser digit result */
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| 27 | int8_t QQchr; /* parser character result */
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[f40a309] | 28 |
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[7258c6a] | 29 | int8_t QQstr[CM_MXSTR]; /* parser string result */
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[f40a309] | 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 | /*
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| 36 | =============================================================================
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| 37 | CMinit(ip) -- initialize the parser to work on the string at 'ip'.
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| 38 | =============================================================================
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| 39 | */
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[7258c6a] | 40 |
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[f40a309] | 41 | void CMinit(int8_t *ip)
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[7258c6a] | 42 | {
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| 43 | register int16_t i;
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[f40a309] | 44 | register int8_t *t;
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| 45 |
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| 46 | QQip = ip;
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| 47 | QQin = ip;
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| 48 | QQsw = TRUE;
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| 49 | QQanch = FALSE;
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| 50 | QQdig = '?';
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| 51 | QQchr = '?';
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| 52 | QQnum = 0;
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| 53 | QQop = QQstr;
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| 54 | t = QQstr;
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| 55 |
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| 56 | for (i = 0; i < CM_MXSTR; i++)
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| 57 | *t++ = '\0';
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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 | /*
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| 65 | =============================================================================
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| 66 | CMchr(c) -- attempt to match character 'c' in the input.
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| 67 | =============================================================================
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[7258c6a] | 68 | */
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[f40a309] | 69 |
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| 70 | int16_t CMchr(int8_t c)
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| 71 | {
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| 72 | CM_DBLK;
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| 73 |
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| 74 | if (c NE *QQip)
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| 75 | return(QQsw = FALSE);
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| 76 |
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| 77 | QQchr = *QQip++;
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| 78 | return(QQsw = TRUE);
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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 | /*
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| 86 | =============================================================================
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| 87 | CMuchr(c) -- attempt to match character 'c' in the input, ignoring case.
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[7258c6a] | 88 | =============================================================================
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[f40a309] | 89 | */
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[7258c6a] | 90 |
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[f40a309] | 91 | int16_t CMuchr(int8_t c)
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| 92 | {
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| 93 | register int8_t t;
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| 94 |
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| 95 | CM_DBLK;
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| 96 |
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| 97 | t = *QQip;
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| 98 |
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| 99 | if (isascii(c))
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| 100 | if (isupper(c))
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| 101 | c = _tolower(c);
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| 102 |
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| 103 | if (isascii(t))
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| 104 | if (isupper(t))
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| 105 | t = _tolower(t);
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| 106 |
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| 107 | if (c NE t)
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| 108 | return(QQsw = FALSE);
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| 109 |
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| 110 | QQchr = *QQip++;
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| 111 | return(QQsw = TRUE);
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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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| 118 | /*
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| 119 | =============================================================================
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[7258c6a] | 120 | CMstr(s) -- attempt to match string at 's' in the input.
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[f40a309] | 121 | =============================================================================
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[7258c6a] | 122 | */
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| 123 |
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[f40a309] | 124 | int16_t CMstr(int8_t *s)
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| 125 | {
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| 126 | register int8_t *t;
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| 127 | int8_t *q;
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| 128 |
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| 129 | CM_DBLK;
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| 130 |
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| 131 | t = QQip;
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| 132 | q = s;
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| 133 |
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| 134 | while (*s) {
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| 135 |
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| 136 | if (*t++ NE *s++)
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| 137 | return(QQsw = FALSE);
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| 138 | }
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| 139 |
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| 140 | QQop = QQstr;
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| 141 |
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| 142 | while (*QQop++ = *q++) ;
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| 143 |
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| 144 | QQip = t;
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| 145 | return(QQsw = TRUE);
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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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| 151 |
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| 152 | /*
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[7258c6a] | 153 | =============================================================================
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[f40a309] | 154 | CMustr(s) -- attempt to match string 's' in the input, ignoring case.
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[7258c6a] | 155 | =============================================================================
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| 156 | */
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[f40a309] | 157 |
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| 158 | int16_t CMustr(int8_t *s)
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| 159 | {
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| 160 | register int8_t *t, t1, t2;
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| 161 | int8_t *q;
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| 162 |
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| 163 | CM_DBLK;
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| 164 |
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| 165 | t = QQip;
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| 166 | q = s;
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| 167 |
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| 168 | while (*s) {
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| 169 |
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| 170 | t1 = *t++;
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| 171 | t2 = *s++;
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| 172 |
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| 173 | if (isascii(t1))
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| 174 | if (isupper(t1))
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| 175 | t1 = _tolower(t1);
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| 176 |
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| 177 | if (isascii(t2))
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| 178 | if (isupper(t2))
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| 179 | t2 = _tolower(t2);
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| 180 |
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| 181 | if (t1 NE t2)
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| 182 | return(QQsw = FALSE);
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| 183 | }
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| 184 |
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| 185 | QQop = QQstr;
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| 186 |
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| 187 | while (*QQop++ = *q++) ;
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| 188 |
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| 189 | QQip = t;
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| 190 | return(QQsw = TRUE);
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| 191 | }
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| 192 |
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| 193 | /* |
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| 194 |
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| 195 | */
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| 196 |
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[7258c6a] | 197 | /*
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[f40a309] | 198 | =============================================================================
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[7258c6a] | 199 | CMlong() -- attempt to parse a digit string in the input as a long.
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| 200 | =============================================================================
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| 201 | */
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[f40a309] | 202 |
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| 203 | int16_t CMlong(void)
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| 204 | {
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| 205 | register int8_t *p;
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| 206 | register int32_t n;
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| 207 | register int8_t c;
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| 208 |
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| 209 | CM_DBLK;
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| 210 |
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| 211 | p = QQip;
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| 212 | n = 0L;
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| 213 | c = *p++;
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| 214 |
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| 215 | if (!isascii(c))
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[9519422] | 216 | return(QQsw = FALSE);
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[f40a309] | 217 |
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| 218 | if (!isdigit(c))
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| 219 | return(QQsw = FALSE);
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| 220 |
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| 221 | n = c - '0';
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| 222 |
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| 223 | while (c = *p) {
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| 224 |
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| 225 | if (!isascii(c))
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| 226 | break;
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| 227 |
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| 228 | if (!isdigit(c))
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| 229 | break;
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| 230 |
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| 231 | n = (n * 10) + (c - '0');
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| 232 | ++p;
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| 233 | }
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| 234 |
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| 235 | QQip = p;
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| 236 | QQnum = n;
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| 237 | return(QQsw = TRUE);
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| 238 | }
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| 239 |
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| 240 | /* |
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| 241 |
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| 242 | */
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[7258c6a] | 243 |
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[f40a309] | 244 | /*
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[7258c6a] | 245 | =============================================================================
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[f40a309] | 246 | CMdig() -- attempt to match a digit in the input string.
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| 247 | =============================================================================
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| 248 | */
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| 249 |
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| 250 | int16_t CMdig(void)
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| 251 | {
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| 252 | register int8_t c;
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| 253 |
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| 254 | CM_DBLK;
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| 255 |
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| 256 | c = *QQip;
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| 257 |
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| 258 | if (!isascii(c))
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| 259 | return(QQsw = FALSE);
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| 260 |
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| 261 | if (!isdigit(c))
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| 262 | return(QQsw = FALSE);
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| 263 |
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| 264 | QQdig = c;
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| 265 | ++QQip;
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| 266 | return(QQsw = TRUE);
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| 267 | }
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| 268 |
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| 269 | /* |
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| 270 |
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[7258c6a] | 271 | */
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[f40a309] | 272 |
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[7258c6a] | 273 | /*
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| 274 | =============================================================================
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[f40a309] | 275 | CMlist(l) -- attempt to match a string from the list 'l' in the input.
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| 276 | =============================================================================
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| 277 | */
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| 278 |
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| 279 | int16_t CMlist(int8_t *l[])
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| 280 | {
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| 281 | register int16_t n;
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| 282 | register int8_t *p, *q;
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| 283 |
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| 284 | CM_DBLK;
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| 285 |
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| 286 | n = 0;
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| 287 |
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| 288 | while (p = *l++) {
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| 289 |
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| 290 | q = p;
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| 291 |
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| 292 | if (CMstr(p)) {
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| 293 |
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| 294 | QQop = QQstr;
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| 295 |
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| 296 | while (*QQop++ = *q++) ;
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| 297 |
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| 298 | QQlnum = n;
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| 299 | return(QQsw = TRUE);
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| 300 | }
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| 301 |
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| 302 | ++n;
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| 303 | }
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| 304 |
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| 305 | return(QQsw = FALSE);
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| 306 | }
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| 307 |
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| 308 | /* |
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| 309 |
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[7258c6a] | 310 | */
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[f40a309] | 311 |
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[7258c6a] | 312 | /*
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| 313 | =============================================================================
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[f40a309] | 314 | CMulist(l) -- attempt to match a string from the list 'l' in the input
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| 315 | ignoring case in both the list and the input string.
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| 316 | =============================================================================
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| 317 | */
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| 318 |
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| 319 | int16_t CMulist(int8_t *l[])
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| 320 | {
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| 321 | register int16_t n;
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| 322 | register int8_t *p, *q;
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| 323 |
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| 324 | CM_DBLK;
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| 325 |
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| 326 | n = 0;
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| 327 |
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| 328 | while (p = *l++) {
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| 329 |
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| 330 | q = p;
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| 331 |
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| 332 | if (CMustr(p)) {
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| 333 |
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| 334 | QQop = QQstr;
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| 335 |
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| 336 | while (*QQop++ = *q++) ;
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| 337 |
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| 338 | QQlnum = n;
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| 339 | return(QQsw = TRUE);
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| 340 | }
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| 341 |
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| 342 | ++n;
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| 343 | }
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| 344 |
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| 345 | return(QQsw = FALSE);
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| 346 | }
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| 347 |
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[7258c6a] | 348 | /* |
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[f40a309] | 349 |
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[7258c6a] | 350 | */
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[f40a309] | 351 |
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| 352 | /*
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| 353 | =============================================================================
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| 354 | CMstat(msg) -- output 'msg and dump parser status. Returns QQsw.
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| 355 | =============================================================================
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| 356 | */
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| 357 |
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| 358 | int16_t CMstat(int8_t *msg)
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| 359 | {
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| 360 | register int8_t *tp;
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| 361 |
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| 362 | tp = QQin;
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| 363 | printf("%s\r\n", msg);
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| 364 | printf(" QQsw: %s, QQanch: %s, QQchr: 0x%02x <%c>, QQdig: %c\r\n",
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| 365 | (QQsw ? "OK" : "NOGO"), (QQanch ? "anchored" : "deblanked"),
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| 366 | QQchr, (isascii(QQchr) ? (isprint(QQchr) ? QQchr : ' ') : ' '),
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| 367 | QQdig);
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| 368 | printf(" QQnum: %ld, QQlnum: %d\r\n", QQnum, QQlnum);
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[6262b5c] | 369 | printf(" QQstr: %s\r\n", QQstr);
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| 370 | printf(" {%s}\r\n", QQin);
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| 371 | printf(" ");
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| 372 |
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| 373 | while (tp++ NE QQip)
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| 374 | printf(" ");
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| 375 |
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| 376 | printf("^\r\n");
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| 377 | return(QQsw);
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| 378 | }
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| 379 |
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