| 1 | /*
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| 2 | * expr.c - expression support functions for cawf(1)
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (c) 1991 Purdue University Research Foundation,
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| 7 | * West Lafayette, Indiana 47907. All rights reserved.
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| 8 | *
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| 9 | * Written by Victor A. Abell <abe@mace.cc.purdue.edu>, Purdue
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| 10 | * University Computing Center. Not derived from licensed software;
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| 11 | * derived from awf(1) by Henry Spencer of the University of Toronto.
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| 12 | *
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| 13 | * Permission is granted to anyone to use this software for any
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| 14 | * purpose on any computer system, and to alter it and redistribute
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| 15 | * it freely, subject to the following restrictions:
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| 16 | *
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| 17 | * 1. The author is not responsible for any consequences of use of
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| 18 | * this software, even if they arise from flaws in it.
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| 19 | *
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| 20 | * 2. The origin of this software must not be misrepresented, either
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| 21 | * by explicit claim or by omission. Credits must appear in the
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| 22 | * documentation.
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| 23 | *
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| 24 | * 3. Altered versions must be plainly marked as such, and must not
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| 25 | * be misrepresented as being the original software. Credits must
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| 26 | * appear in the documentation.
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| 27 | *
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| 28 | * 4. This notice may not be removed or altered.
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| 29 | */
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| 30 |
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| 31 | #include "cawf.h"
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| 32 |
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| 33 |
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| 34 | /*
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| 35 | * Asmcode(s, c) - assemble number/name code following backslash-character
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| 36 | * definition - e. .g, "\\nPO"
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| 37 | */
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| 38 |
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| 39 | unsigned char *
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| 40 | Asmcode(s, c)
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| 41 | unsigned char **s; /* pointer to character after '\\' */
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| 42 | unsigned char *c; /* code destination (c[3]) */
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| 43 | {
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| 44 | unsigned char *s1;
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| 45 |
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| 46 | s1 = *s + 1;
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| 47 | c[0] = c[1] = c[2] = '\0';
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| 48 | if ((c[0] = *s1) == '(') {
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| 49 | s1++;
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| 50 | if ((c[0] = *s1) != '\0') {
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| 51 | s1++;
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| 52 | c[1] = *s1;
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| 53 | }
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| 54 | }
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| 55 | return(s1);
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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 | * Delnum(nx) - delete number
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| 61 | */
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| 62 |
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| 63 | void
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| 64 | Delnum(nx)
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| 65 | int nx; /* number index */
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| 66 | {
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| 67 | unsigned char buf[MAXLINE]; /* message buffer */
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| 68 |
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| 69 | if (nx >= Nnr) {
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| 70 | (void) sprintf((char *)buf, " bad Delnum(%d) index", nx);
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| 71 | Error(FATAL, LINE, (char *)buf, NULL);
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| 72 | }
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| 73 | while (nx < (Nnr - 1)) {
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| 74 | Numb[nx] = Numb[nx + 1];
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| 75 | nx++;
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| 76 | }
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| 77 | Nnr--;
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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 | * Findnum(n, v, e) - find or optionally enter number value
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| 83 | */
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| 84 |
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| 85 | Findnum(n, v, e)
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| 86 | unsigned char *n; /* register name */
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| 87 | int v; /* value */
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| 88 | int e; /* 0 = find, don't enter
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| 89 | * 1 = enter, don't find */
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| 90 | {
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| 91 | int cmp, low, hi, mid; /* binary search controls */
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| 92 | unsigned char c[3]; /* name buffer */
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| 93 |
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| 94 | c[0] = n[0];
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| 95 | c[1] = (n[1] == ' ' || n[1] == '\t') ? '\0' : n[1];
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| 96 | c[2] = '\0';
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| 97 | low = mid = 0;
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| 98 | hi = Nnr - 1;
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| 99 | while (low <= hi) {
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| 100 | mid = (low + hi) / 2;
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| 101 | if ((cmp = strncmp((char *)c, (char *)Numb[mid].nm, 2)) < 0)
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| 102 | hi = mid - 1;
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| 103 | else if (cmp > 0)
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| 104 | low = mid + 1;
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| 105 | else {
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| 106 | if (e)
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| 107 | Numb[mid].val = v;
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| 108 | return(mid);
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| 109 | }
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| 110 | }
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| 111 | if ( ! e)
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| 112 | return(-1);
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| 113 | if (Nnr >= MAXNR)
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| 114 | Error(FATAL, LINE, " out of number registers at ", (char *)c);
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| 115 | if (Nnr) {
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| 116 | if (cmp > 0)
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| 117 | mid++;
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| 118 | for (hi = Nnr - 1; hi >= mid; hi--)
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| 119 | Numb[hi+1] = Numb[hi];
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| 120 | }
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| 121 | Nnr++;
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| 122 | Numb[mid].nm[0] = c[0];
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| 123 | Numb[mid].nm[1] = c[1];
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| 124 | Numb[mid].val = v;
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| 125 | return(mid);
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| 126 | }
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| 127 |
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| 128 |
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| 129 | /*
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| 130 | * Findparms(n) - find parameter registers
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| 131 | */
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| 132 |
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| 133 | Findparms(n)
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| 134 | unsigned char *n; /* parameter name */
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| 135 | {
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| 136 | unsigned char c[3]; /* character buffer */
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| 137 | int i; /* temporary index */
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| 138 |
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| 139 | c[0] = n[0];
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| 140 | c[1] = (n[1] == ' ' || n[1] == '\t') ? '\0' : n[1];
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| 141 | c[2] = '\0';
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| 142 | for (i = 0; Parms[i].nm[0]; i++) {
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| 143 | if (c[0] == Parms[i].nm[0] && c[1] == Parms[i].nm[1])
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| 144 | return(i);
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| 145 | }
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| 146 | return(-1);
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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 | * Findscale(n, v, e) - find and optionally enter scaling factor value
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| 152 | */
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| 153 |
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| 154 | Findscale(n, v, e)
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| 155 | int n; /* scaling factor name */
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| 156 | double v; /* value */
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| 157 | int e; /* 0 = find, don't enter
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| 158 | * 1 = enter, don't find */
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| 159 | {
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| 160 | int i;
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| 161 | double *pval;
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| 162 |
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| 163 | for (i = 0; Scale[i].nm; i++) {
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| 164 | if ((unsigned char )n == Scale[i].nm)
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| 165 | break;
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| 166 | }
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| 167 | if (Scale[i].nm) {
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| 168 | if (e) {
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| 169 | pval = &Scale[i].val;
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| 170 | *pval = v;
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| 171 | }
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| 172 | return(i);
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| 173 | }
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| 174 | return(-1);
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| 175 | }
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