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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Meta-file input and output routines
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*/
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#include "meta.h"
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static PRIMITIVE peof = {PEOF, 0200, -1, -1, -1, -1, NULL};
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#define INTARG(n) (((unsigned)inbuf[n] << 7) | (unsigned)inbuf[n+1])
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readp(p, fp) /* read in primitive from file */
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PRIMITIVE *p;
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FILE *fp;
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{
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char inbuf[MAXARGS];
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register int c, nargs;
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if (fp == NULL) fp = stdin;
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if ((c = getc(fp)) == EOF) { /* used to be fatal */
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mcopy((char *)p, (char *)&peof, sizeof(PRIMITIVE));
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return(0);
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}
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if (!(c & 0200))
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error(USER, "readp not started on command");
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p->com = c & 0177;
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if (!iscom(p->com))
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error(USER, "bad command in readp");
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for (nargs = 0; (c = getc(fp)) != EOF && !(c & 0200) &&
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nargs < MAXARGS-1; nargs++)
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inbuf[nargs] = c;
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if (c & 0200)
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ungetc(c, fp);
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else if (nargs >= MAXARGS-1)
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error(USER, "command w/ too many arguments in readp");
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c = 0;
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if (nargs) {
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p->arg0 = inbuf[c++];
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nargs--;
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}
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else
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p->arg0 = 0200;
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if (isprim(p->com)) {
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if (nargs < 8)
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error(USER, "missing extent in readp");
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p->xy[XMN] = INTARG(c); c += 2;
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p->xy[YMN] = INTARG(c); c += 2;
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p->xy[XMX] = INTARG(c); c += 2;
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p->xy[YMX] = INTARG(c); c += 2;
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nargs -= 8;
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}
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else
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p->xy[XMN] = p->xy[YMN] = p->xy[XMX] = p->xy[YMX] = -1;
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if (nargs) {
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inbuf[c+nargs] = '\0';
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p->args = savestr(inbuf+c);
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}
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else
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p->args = NULL;
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return(p->com != PEOF);
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}
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#undef INTARG
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#define HI7(i) ((i >> 7) & 0177)
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#define LO7(i) (i & 0177)
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writep(p, fp) /* write primitive to file */
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register PRIMITIVE *p;
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FILE *fp;
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{
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if (fp == NULL) fp = stdout;
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if (!iscom(p->com))
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error(USER, "bad command in writep");
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putc(p->com | 0200, fp);
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if (isprim(p->com)) {
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putc(p->arg0 & 0177, fp);
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putc(HI7(p->xy[XMN]), fp); putc(LO7(p->xy[XMN]), fp);
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putc(HI7(p->xy[YMN]), fp); putc(LO7(p->xy[YMN]), fp);
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putc(HI7(p->xy[XMX]), fp); putc(LO7(p->xy[XMX]), fp);
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putc(HI7(p->xy[YMX]), fp); putc(LO7(p->xy[YMX]), fp);
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}
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else if (!(p->arg0 & 0200))
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putc(p->arg0, fp);
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if (p->args != NULL)
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fputs(p->args, fp);
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if (p->com == PDRAW || p->com == PEOF)
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if (fflush(fp) == -1)
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error(SYSTEM, "error detected writing file in writep");
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}
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#undef HI7
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#undef LO7
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writeof(fp) /* write end of file command to fp */
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FILE *fp;
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{
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writep(&peof, fp);
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}
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