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greg |
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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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} |
