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1.1 root 1: /*
2: * reg.c
3: * Nroff/Troff.
4: * Register manipulation.
5: */
6:
7: #include "roff.h"
8:
9: /*
10: * Return a pointer to a number register of the given name.
11: */
12: REG *
13: getnreg(name) char name[2];
14: {
15: register REG *rp;
16:
17: if ((rp = findreg(name, RNUMR)) == NULL) {
18: rp = makereg(name, RNUMR);
19: rp->n_reg.r_nval = 0;
20: rp->n_reg.r_form = '1';
21: rp->n_reg.r_incr = 1;
22: }
23: return rp;
24: }
25:
26: /*
27: * Create a register of the given name and type. If one
28: * already exists, remove it.
29: */
30: REG *
31: makereg(name, type) char name[2]; int type;
32: {
33: REG **rpp;
34: register REG *rp;
35: register MAC *mp, *lmp;
36:
37: if (rp = findreg(name, type)) {
38: #if (DDEBUG & DBGREGS)
39: printd(DBGREGS,"makereg: deleting old register %c%c\n",
40: name[0], name[1]);
41: #endif
42: if (rp->t_reg.r_type == RTEXT) {
43: rp->t_reg.r_maxh = 0;
44: rp->t_reg.r_maxw = 0;
45: mp = rp->t_reg.r_macd.t_div.m_next;
46: while (mp) {
47: if (mp->t_div.m_type==MTEXT &&
48: mp->t_div.m_core!=NULL)
49: nfree(mp->t_div.m_core);
50: lmp = mp;
51: mp = mp->t_div.m_next;
52: nfree(lmp);
53: }
54: }
55: } else {
56: #if (DDEBUG & DBGREGS)
57: printd(DBGREGS,"makereg: creating register %c%c, type %d\n",
58: name[0],name[1],type);
59: #endif
60: rpp = ®t[hash(name)];
61: rp = (REG *) nalloc(sizeof *rp);
62: rp->t_reg.r_type = type;
63: rp->t_reg.r_name[0] = name[0];
64: rp->t_reg.r_name[1] = name[1];
65: rp->t_reg.r_maxh = 0;
66: rp->t_reg.r_maxw = 0;
67: rp->t_reg.r_next = *rpp;
68: *rpp = rp;
69: }
70: return rp;
71: }
72:
73: /*
74: * Remove the given text register or request.
75: * Return 1 if the register is found, else 0.
76: */
77: reltreg(name) char name[2];
78: {
79: MAC *lmp;
80: register MAC *mp;
81: register REG *rp, **lrp;
82:
83: #if (DDEBUG & DBGREGS)
84: printd(DBGREGS, "reltreg: removing text register %c%c\n", name[0],name[1]);
85: #endif
86: for (lrp = ®t[hash(name)]; rp = *lrp; lrp = &rp->t_reg.r_next) {
87: if (rp->n_reg.r_name[0]==name[0] &&
88: rp->n_reg.r_name[1]==name[1]) {
89: if (rp->n_reg.r_type != RTEXT)
90: continue;
91: mp = rp->t_reg.r_macd.t_div.m_next;
92: while (mp) {
93: if (mp->t_div.m_type==MTEXT &&
94: mp->t_div.m_core!=NULL)
95: nfree(mp->t_div.m_core);
96: lmp = mp;
97: mp = mp->t_div.m_next;
98: nfree(lmp);
99: }
100: *lrp = rp->t_reg.r_next;
101: nfree(rp);
102: return 1;
103: }
104: }
105: return 0;
106: }
107:
108: /*
109: * Remove the given number register.
110: * Return 1 if we found it, else 0.
111: */
112: relnreg(name) char name[2];
113: {
114: register REG *rp, **lrp;
115:
116: #if (DDEBUG & DBGREGS)
117: printd(DBGREGS, "relnreg: removing number register %c%c\n",
118: name[0],name[1]);
119: #endif
120: for (lrp = ®t[hash(name)]; rp = *lrp; lrp = &rp->t_reg.r_next) {
121: if (rp->n_reg.r_name[0]==name[0] &&
122: rp->n_reg.r_name[1]==name[1]) {
123: if (rp->n_reg.r_type == RNUMR) {
124: *lrp = rp->t_reg.r_next;
125: nfree(rp);
126: return 1;
127: }
128: }
129: }
130: return 0;
131: }
132:
133: /*
134: * Given a register name and a register type,
135: * return a pointer to the register if it exists or NULL if not.
136: */
137: REG *
138: findreg(name, type) char name[2]; int type;
139: {
140: register REG *rp;
141:
142: #if (DDEBUG & DBGREGX)
143: printd(DBGREGX, "findreg: looking for register %c%c, type %d --",
144: name[0],name[1],type);
145: #endif
146: for (rp=regt[hash(name)]; rp; rp=rp->t_reg.r_next)
147: if (rp->n_reg.r_name[0]==name[0] &&
148: rp->n_reg.r_name[1]==name[1])
149: if (rp->n_reg.r_type == type) {
150: #if (DDEBUG & DBGREGX)
151: printd(DBGREGX, "found\n");
152: #endif
153: return rp;
154: }
155: #if (DDEBUG & DBGREGX)
156: printd(DBGREGX, "not found\n");
157: #endif
158: return NULL;
159: }
160:
161: /*
162: * Convert a string to a two character register name.
163: */
164: argname(str, name) register char *str; char name[2];
165: {
166: if ((name[0] = str[0]) == '\0')
167: name[1] = '\0';
168: else
169: name[1] = str[1];
170: }
171:
172: /* end of reg.c */
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