[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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| 11 | #include <stddefs.h>
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| 12 | #include <ctype.h>
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| 13 |
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[e225e77] | 14 | #include "stdio.h"
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| 15 |
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[f40a309] | 16 | #define CM_MXSTR 257 /* maximum parser string result length */
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| 17 |
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| 18 | #define CM_DBLK if (!QQanch) while (*QQip EQ ' ') ++QQip
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| 19 |
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[7258c6a] | 20 | int16_t QQsw; /* parser result switch */
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| 21 | int16_t QQanch; /* parser anchored match switch */
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[f40a309] | 22 |
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[7258c6a] | 23 | int8_t *QQin; /* parser initial input pointer */
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| 24 | int8_t *QQip; /* parser current input pointer */
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| 25 | int8_t *QQop; /* parser string output pointer */
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[f40a309] | 26 |
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[7258c6a] | 27 | int32_t QQnum; /* parser numeric result */
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| 28 | int16_t QQlnum; /* parser list element number result */
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| 29 | int8_t QQdig; /* parser digit result */
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| 30 | int8_t QQchr; /* parser character result */
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[f40a309] | 31 |
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[7258c6a] | 32 | int8_t QQstr[CM_MXSTR]; /* parser string result */
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[f40a309] | 33 |
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| 34 | /* |
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| 35 |
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| 36 | */
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| 37 |
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| 38 | /*
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| 39 | =============================================================================
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| 40 | CMinit(ip) -- initialize the parser to work on the string at 'ip'.
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| 41 | =============================================================================
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| 42 | */
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[7258c6a] | 43 |
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[f40a309] | 44 | void CMinit(int8_t *ip)
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[7258c6a] | 45 | {
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| 46 | register int16_t i;
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[f40a309] | 47 | register int8_t *t;
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| 48 |
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| 49 | QQip = ip;
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| 50 | QQin = ip;
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| 51 | QQsw = TRUE;
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| 52 | QQanch = FALSE;
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| 53 | QQdig = '?';
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| 54 | QQchr = '?';
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| 55 | QQnum = 0;
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| 56 | QQop = QQstr;
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| 57 | t = QQstr;
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| 58 |
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| 59 | for (i = 0; i < CM_MXSTR; i++)
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| 60 | *t++ = '\0';
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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 |
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| 67 | /*
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| 68 | =============================================================================
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| 69 | CMchr(c) -- attempt to match character 'c' in the input.
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| 70 | =============================================================================
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[7258c6a] | 71 | */
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[f40a309] | 72 |
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| 73 | int16_t CMchr(int8_t c)
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| 74 | {
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| 75 | CM_DBLK;
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| 76 |
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| 77 | if (c NE *QQip)
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| 78 | return(QQsw = FALSE);
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| 79 |
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| 80 | QQchr = *QQip++;
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| 81 | return(QQsw = TRUE);
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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 |
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| 88 | /*
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| 89 | =============================================================================
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| 90 | CMuchr(c) -- attempt to match character 'c' in the input, ignoring case.
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[7258c6a] | 91 | =============================================================================
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[f40a309] | 92 | */
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[7258c6a] | 93 |
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[f40a309] | 94 | int16_t CMuchr(int8_t c)
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| 95 | {
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| 96 | register int8_t t;
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| 97 |
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| 98 | CM_DBLK;
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| 99 |
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| 100 | t = *QQip;
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| 101 |
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| 102 | if (isascii(c))
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| 103 | if (isupper(c))
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| 104 | c = _tolower(c);
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| 105 |
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| 106 | if (isascii(t))
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| 107 | if (isupper(t))
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| 108 | t = _tolower(t);
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| 109 |
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| 110 | if (c NE t)
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| 111 | return(QQsw = FALSE);
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| 112 |
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| 113 | QQchr = *QQip++;
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| 114 | return(QQsw = TRUE);
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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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| 120 |
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| 121 | /*
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| 122 | =============================================================================
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[7258c6a] | 123 | CMstr(s) -- attempt to match string at 's' in the input.
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[f40a309] | 124 | =============================================================================
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[7258c6a] | 125 | */
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| 126 |
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[f40a309] | 127 | int16_t CMstr(int8_t *s)
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| 128 | {
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| 129 | register int8_t *t;
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| 130 | int8_t *q;
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| 131 |
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| 132 | CM_DBLK;
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| 133 |
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| 134 | t = QQip;
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| 135 | q = s;
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| 136 |
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| 137 | while (*s) {
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| 138 |
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| 139 | if (*t++ NE *s++)
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| 140 | return(QQsw = FALSE);
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| 141 | }
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| 142 |
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| 143 | QQop = QQstr;
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| 144 |
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| 145 | while (*QQop++ = *q++) ;
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| 146 |
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| 147 | QQip = t;
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| 148 | return(QQsw = TRUE);
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| 149 | }
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| 150 |
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| 151 | /* |
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| 152 |
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| 153 | */
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| 154 |
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| 155 | /*
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[7258c6a] | 156 | =============================================================================
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[f40a309] | 157 | CMustr(s) -- attempt to match string 's' in the input, ignoring case.
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[7258c6a] | 158 | =============================================================================
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| 159 | */
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[f40a309] | 160 |
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| 161 | int16_t CMustr(int8_t *s)
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| 162 | {
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| 163 | register int8_t *t, t1, t2;
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| 164 | int8_t *q;
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| 165 |
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| 166 | CM_DBLK;
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| 167 |
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| 168 | t = QQip;
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| 169 | q = s;
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| 170 |
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| 171 | while (*s) {
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| 172 |
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| 173 | t1 = *t++;
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| 174 | t2 = *s++;
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| 175 |
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| 176 | if (isascii(t1))
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| 177 | if (isupper(t1))
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| 178 | t1 = _tolower(t1);
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| 179 |
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| 180 | if (isascii(t2))
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| 181 | if (isupper(t2))
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| 182 | t2 = _tolower(t2);
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| 183 |
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| 184 | if (t1 NE t2)
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| 185 | return(QQsw = FALSE);
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| 186 | }
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| 187 |
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| 188 | QQop = QQstr;
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| 189 |
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| 190 | while (*QQop++ = *q++) ;
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| 191 |
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| 192 | QQip = t;
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| 193 | return(QQsw = TRUE);
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| 194 | }
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| 195 |
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| 196 | /* |
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| 197 |
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| 198 | */
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| 199 |
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[7258c6a] | 200 | /*
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[f40a309] | 201 | =============================================================================
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[7258c6a] | 202 | CMlong() -- attempt to parse a digit string in the input as a long.
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| 203 | =============================================================================
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| 204 | */
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[f40a309] | 205 |
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| 206 | int16_t CMlong(void)
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| 207 | {
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| 208 | register int8_t *p;
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| 209 | register int32_t n;
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| 210 | register int8_t c;
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| 211 |
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| 212 | CM_DBLK;
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| 213 |
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| 214 | p = QQip;
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| 215 | n = 0L;
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| 216 | c = *p++;
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| 217 |
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| 218 | if (!isascii(c))
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[9519422] | 219 | return(QQsw = FALSE);
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[f40a309] | 220 |
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| 221 | if (!isdigit(c))
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| 222 | return(QQsw = FALSE);
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| 223 |
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| 224 | n = c - '0';
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| 225 |
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| 226 | while (c = *p) {
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| 227 |
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| 228 | if (!isascii(c))
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| 229 | break;
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| 230 |
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| 231 | if (!isdigit(c))
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| 232 | break;
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| 233 |
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| 234 | n = (n * 10) + (c - '0');
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| 235 | ++p;
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| 236 | }
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| 237 |
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| 238 | QQip = p;
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| 239 | QQnum = n;
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| 240 | return(QQsw = TRUE);
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| 241 | }
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| 242 |
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| 243 | /* |
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| 244 |
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| 245 | */
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[7258c6a] | 246 |
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[f40a309] | 247 | /*
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[7258c6a] | 248 | =============================================================================
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[f40a309] | 249 | CMdig() -- attempt to match a digit in the input string.
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| 250 | =============================================================================
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| 251 | */
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| 252 |
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| 253 | int16_t CMdig(void)
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| 254 | {
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| 255 | register int8_t c;
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| 256 |
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| 257 | CM_DBLK;
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| 258 |
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| 259 | c = *QQip;
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| 260 |
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| 261 | if (!isascii(c))
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| 262 | return(QQsw = FALSE);
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| 263 |
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| 264 | if (!isdigit(c))
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| 265 | return(QQsw = FALSE);
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| 266 |
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| 267 | QQdig = c;
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| 268 | ++QQip;
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| 269 | return(QQsw = TRUE);
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| 270 | }
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| 271 |
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| 272 | /* |
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| 273 |
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[7258c6a] | 274 | */
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[f40a309] | 275 |
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[7258c6a] | 276 | /*
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| 277 | =============================================================================
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[f40a309] | 278 | CMlist(l) -- attempt to match a string from the list 'l' in the input.
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| 279 | =============================================================================
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| 280 | */
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| 281 |
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| 282 | int16_t CMlist(int8_t *l[])
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| 283 | {
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| 284 | register int16_t n;
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| 285 | register int8_t *p, *q;
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| 286 |
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| 287 | CM_DBLK;
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| 288 |
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| 289 | n = 0;
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| 290 |
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| 291 | while (p = *l++) {
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| 292 |
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| 293 | q = p;
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| 294 |
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| 295 | if (CMstr(p)) {
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| 296 |
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| 297 | QQop = QQstr;
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| 298 |
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| 299 | while (*QQop++ = *q++) ;
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| 300 |
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| 301 | QQlnum = n;
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| 302 | return(QQsw = TRUE);
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| 303 | }
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| 304 |
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| 305 | ++n;
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| 306 | }
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| 307 |
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| 308 | return(QQsw = FALSE);
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| 309 | }
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| 310 |
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| 311 | /* |
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| 312 |
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[7258c6a] | 313 | */
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[f40a309] | 314 |
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[7258c6a] | 315 | /*
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| 316 | =============================================================================
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[f40a309] | 317 | CMulist(l) -- attempt to match a string from the list 'l' in the input
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| 318 | ignoring case in both the list and the input string.
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| 319 | =============================================================================
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| 320 | */
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| 321 |
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| 322 | int16_t CMulist(int8_t *l[])
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| 323 | {
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| 324 | register int16_t n;
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| 325 | register int8_t *p, *q;
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| 326 |
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| 327 | CM_DBLK;
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| 328 |
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| 329 | n = 0;
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| 330 |
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| 331 | while (p = *l++) {
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| 332 |
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| 333 | q = p;
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| 334 |
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| 335 | if (CMustr(p)) {
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| 336 |
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| 337 | QQop = QQstr;
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| 338 |
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| 339 | while (*QQop++ = *q++) ;
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| 340 |
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| 341 | QQlnum = n;
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| 342 | return(QQsw = TRUE);
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| 343 | }
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| 344 |
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| 345 | ++n;
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| 346 | }
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| 347 |
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| 348 | return(QQsw = FALSE);
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| 349 | }
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| 350 |
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[7258c6a] | 351 | /* |
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[f40a309] | 352 |
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[7258c6a] | 353 | */
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[f40a309] | 354 |
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| 355 | /*
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| 356 | =============================================================================
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| 357 | CMstat(msg) -- output 'msg and dump parser status. Returns QQsw.
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| 358 | =============================================================================
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| 359 | */
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| 360 |
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| 361 | int16_t CMstat(int8_t *msg)
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| 362 | {
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| 363 | register int8_t *tp;
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| 364 |
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| 365 | tp = QQin;
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| 366 | printf("%s\r\n", msg);
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| 367 | printf(" QQsw: %s, QQanch: %s, QQchr: 0x%02x <%c>, QQdig: %c\r\n",
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| 368 | (QQsw ? "OK" : "NOGO"), (QQanch ? "anchored" : "deblanked"),
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| 369 | QQchr, (isascii(QQchr) ? (isprint(QQchr) ? QQchr : ' ') : ' '),
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| 370 | QQdig);
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| 371 | printf(" QQnum: %ld, QQlnum: %d\r\n", QQnum, QQlnum);
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| 372 | printf(" QQstr: %s\r\n", QQstr);
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| 373 | printf(" {%s}\r\n", QQin);
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| 374 | printf(" ");
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| 375 |
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| 376 | while (tp++ NE QQip)
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| 377 | printf(" ");
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| 378 |
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| 379 | printf("^\r\n");
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| 380 | return(QQsw);
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| 381 | }
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