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#ifndef lint |
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static const char RCSid[] = "$Id: segment.c,v 1.1 2003/02/22 02:07:26 greg Exp $"; |
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#endif |
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/* |
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* Routines for segment storage and inclusion for meta-files |
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* |
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* 12/18/84 |
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*/ |
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#include <string.h> |
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#include "rtio.h" |
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#include "meta.h" |
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#define NODEC 0 /* null declaration (must be 0) */ |
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#define MAXDEC 2048 /* maximum number of declarations */ |
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#define NHASH 101 /* hash size (prime) */ |
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static struct declaration { |
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char *sname; /* segment name */ |
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PLIST sprims; /* segment primitives */ |
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int context; /* declaration containing us */ |
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int nexthash; /* next in hash list */ |
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} dectabl[MAXDEC]; |
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static int hashtabl[NHASH]; |
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static int dectop = 0; /* top of declaration table */ |
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static int curdec = NODEC; /* current declaration */ |
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static int hash(register char *s); |
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static int lookup(register char *name); |
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static int |
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hash( /* hash a string */ |
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register char *s |
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) |
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{ |
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register int hval = 0; |
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while (*s) |
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hval += *s++; |
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return(hval % NHASH); |
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} |
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static int |
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lookup( /* find name in declaration table */ |
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register char *name |
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) |
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{ |
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register int curd; |
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if (name == NULL) |
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error(USER, "illegal null segment name in lookup"); |
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for (curd = hashtabl[hash(name)]; curd != NODEC; curd = dectabl[curd].nexthash) |
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if (strcmp(name, dectabl[curd].sname) == 0) |
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break; |
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return(curd); |
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} |
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int |
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inseg(void) /* return TRUE if currently in a segment */ |
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{ |
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return(curdec != NODEC); |
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} |
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void |
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openseg( /* open a new segment */ |
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char *name |
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) |
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{ |
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register int olddec; |
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if ((olddec = lookup(name)) != NODEC && |
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dectabl[olddec].context == curdec) /* redefined segment */ |
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plfree(&dectabl[olddec].sprims); |
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if (++dectop >= MAXDEC) |
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error(SYSTEM, "too many segments in openseg"); |
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dectabl[dectop].sname = savestr(name); |
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/* save previous context */ |
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dectabl[dectop].context = curdec; |
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curdec = dectop; |
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} |
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void |
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segprim( /* store primitive in current segment */ |
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register PRIMITIVE *p |
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) |
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{ |
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register PRIMITIVE *newp; |
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if (!inseg()) |
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error(SYSTEM, "illegal call to segprim"); |
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switch (p->com) { |
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case POPEN: |
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openseg(p->args); |
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break; |
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case PSEG: |
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segment(p, segprim); |
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break; |
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case PCLOSE: |
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closeseg(); |
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break; |
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default: |
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if ((newp = palloc()) == NULL) |
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error(SYSTEM, "memory limit exceeded in segprim"); |
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mcopy((char *)newp, (char *)p, sizeof(PRIMITIVE)); |
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newp->args = savestr(p->args); |
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add(newp, &dectabl[curdec].sprims); |
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break; |
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} |
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} |
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void |
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closeseg(void) /* close the current segment */ |
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{ |
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register int i; |
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if (!inseg()) |
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error(SYSTEM, "illegal call to closeseg"); |
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/* undefine internal declarations */ |
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for (i = dectop; i > curdec; i--) { |
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hashtabl[hash(dectabl[i].sname)] = dectabl[i].nexthash; |
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freestr(dectabl[i].sname); |
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plfree(&dectabl[i].sprims); |
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} |
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dectop = curdec; |
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/* define this declaration */ |
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i = hash(dectabl[curdec].sname); |
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dectabl[curdec].nexthash = hashtabl[i]; |
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hashtabl[i] = curdec; |
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/* return context */ |
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curdec = dectabl[curdec].context; |
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} |
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void |
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segment( /* expand segment p */ |
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PRIMITIVE *p, |
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void (*funcp)(PRIMITIVE *p) |
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) |
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greg |
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{ |
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int decln; |
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PRIMITIVE curp; |
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register PRIMITIVE *sp; |
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if ((decln = lookup(p->args)) == NODEC) { |
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sprintf(errmsg, "reference to undefined segment \"%s\" in segment", |
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p->args); |
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error(USER, errmsg); |
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} |
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for (sp = dectabl[decln].sprims.ptop; sp != NULL; sp = sp->pnext) |
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if (isglob(sp->com)) |
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(*funcp)(sp); |
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else { |
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switch (curp.com = sp->com) { |
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case PSEG: |
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case PVSTR: |
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case PTFILL: |
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case PPFILL: |
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curp.arg0 = (sp->arg0 & 0100) | |
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(((sp->arg0 & 060) + p->arg0) & 060); |
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break; |
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case PLSEG: |
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if (p->arg0 & 020) |
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curp.arg0 = (~sp->arg0 & 0100) | (sp->arg0 & 060); |
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else |
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curp.arg0 = sp->arg0 & 0160; |
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break; |
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default: |
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curp.arg0 = sp->arg0 & 0160; |
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break; |
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} |
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if (p->arg0 & 014) |
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curp.arg0 |= p->arg0 & 014; |
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else |
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curp.arg0 |= sp->arg0 & 014; |
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if (p->arg0 & 03) |
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curp.arg0 |= p->arg0 & 03; |
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else |
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curp.arg0 |= sp->arg0 & 03; |
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curp.xy[XMN] = xlate(XMN, sp, p); |
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curp.xy[YMN] = xlate(YMN, sp, p); |
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curp.xy[XMX] = xlate(XMX, sp, p); |
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curp.xy[YMX] = xlate(YMX, sp, p); |
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curp.args = sp->args; |
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(*funcp)(&curp); |
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} |
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} |
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int |
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schorsch |
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xlate( /* return extrema from p through px */ |
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short extrema, |
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PRIMITIVE *p, |
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register PRIMITIVE *px |
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) |
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greg |
1.1 |
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{ |
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short oldex; |
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int val; |
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if (((oldex = (extrema + 4 - ((px->arg0 >> 4) & 03))%4) ^ extrema) & 02) |
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val = (XYSIZE-1) - p->xy[oldex]; |
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else |
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val = p->xy[oldex]; |
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if (extrema & 01) |
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return(CONV(val, px->xy[YMX] - px->xy[YMN]) + px->xy[YMN]); |
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else |
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return(CONV(val, px->xy[XMX] - px->xy[XMN]) + px->xy[XMN]); |
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} |
