| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: mfio.c,v 1.1 2003/02/22 02:07:26 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Meta-file input and output routines |
| 6 |
*/ |
| 7 |
|
| 8 |
#include "meta.h" |
| 9 |
|
| 10 |
|
| 11 |
static PRIMITIVE peof = {PEOF, 0200, {-1, -1, -1, -1}, NULL, NULL}; |
| 12 |
|
| 13 |
|
| 14 |
|
| 15 |
#define INTARG(n) (((unsigned)inbuf[n] << 7) | (unsigned)inbuf[n+1]) |
| 16 |
|
| 17 |
|
| 18 |
int |
| 19 |
readp( /* read in primitive from file */ |
| 20 |
PRIMITIVE *p, |
| 21 |
FILE *fp |
| 22 |
) |
| 23 |
|
| 24 |
{ |
| 25 |
char inbuf[MAXARGS]; |
| 26 |
register int c, nargs; |
| 27 |
|
| 28 |
if (fp == NULL) fp = stdin; |
| 29 |
|
| 30 |
if ((c = getc(fp)) == EOF) { /* used to be fatal */ |
| 31 |
mcopy((char *)p, (char *)&peof, sizeof(PRIMITIVE)); |
| 32 |
return(0); |
| 33 |
} |
| 34 |
if (!(c & 0200)) |
| 35 |
error(USER, "readp not started on command"); |
| 36 |
|
| 37 |
p->com = c & 0177; |
| 38 |
if (!iscom(p->com)) |
| 39 |
error(USER, "bad command in readp"); |
| 40 |
|
| 41 |
for (nargs = 0; (c = getc(fp)) != EOF && !(c & 0200) && |
| 42 |
nargs < MAXARGS-1; nargs++) |
| 43 |
inbuf[nargs] = c; |
| 44 |
|
| 45 |
if (c & 0200) |
| 46 |
ungetc(c, fp); |
| 47 |
else if (nargs >= MAXARGS-1) |
| 48 |
error(USER, "command w/ too many arguments in readp"); |
| 49 |
|
| 50 |
c = 0; |
| 51 |
|
| 52 |
if (nargs) { |
| 53 |
p->arg0 = inbuf[c++]; |
| 54 |
nargs--; |
| 55 |
} |
| 56 |
else |
| 57 |
p->arg0 = 0200; |
| 58 |
|
| 59 |
if (isprim(p->com)) { |
| 60 |
if (nargs < 8) |
| 61 |
error(USER, "missing extent in readp"); |
| 62 |
p->xy[XMN] = INTARG(c); c += 2; |
| 63 |
p->xy[YMN] = INTARG(c); c += 2; |
| 64 |
p->xy[XMX] = INTARG(c); c += 2; |
| 65 |
p->xy[YMX] = INTARG(c); c += 2; |
| 66 |
nargs -= 8; |
| 67 |
} |
| 68 |
else |
| 69 |
p->xy[XMN] = p->xy[YMN] = p->xy[XMX] = p->xy[YMX] = -1; |
| 70 |
|
| 71 |
if (nargs) { |
| 72 |
inbuf[c+nargs] = '\0'; |
| 73 |
p->args = savestr(inbuf+c); |
| 74 |
} |
| 75 |
else |
| 76 |
p->args = NULL; |
| 77 |
|
| 78 |
return(p->com != PEOF); |
| 79 |
} |
| 80 |
|
| 81 |
#undef INTARG |
| 82 |
|
| 83 |
|
| 84 |
|
| 85 |
|
| 86 |
|
| 87 |
|
| 88 |
|
| 89 |
#define HI7(i) ((i >> 7) & 0177) |
| 90 |
|
| 91 |
#define LO7(i) (i & 0177) |
| 92 |
|
| 93 |
|
| 94 |
void |
| 95 |
writep( /* write primitive to file */ |
| 96 |
register PRIMITIVE *p, |
| 97 |
FILE *fp |
| 98 |
) |
| 99 |
{ |
| 100 |
if (fp == NULL) fp = stdout; |
| 101 |
|
| 102 |
if (!iscom(p->com)) |
| 103 |
error(USER, "bad command in writep"); |
| 104 |
|
| 105 |
putc(p->com | 0200, fp); |
| 106 |
|
| 107 |
if (isprim(p->com)) { |
| 108 |
putc(p->arg0 & 0177, fp); |
| 109 |
putc(HI7(p->xy[XMN]), fp); putc(LO7(p->xy[XMN]), fp); |
| 110 |
putc(HI7(p->xy[YMN]), fp); putc(LO7(p->xy[YMN]), fp); |
| 111 |
putc(HI7(p->xy[XMX]), fp); putc(LO7(p->xy[XMX]), fp); |
| 112 |
putc(HI7(p->xy[YMX]), fp); putc(LO7(p->xy[YMX]), fp); |
| 113 |
} |
| 114 |
else if (!(p->arg0 & 0200)) |
| 115 |
putc(p->arg0, fp); |
| 116 |
|
| 117 |
if (p->args != NULL) |
| 118 |
fputs(p->args, fp); |
| 119 |
|
| 120 |
if (p->com == PDRAW || p->com == PEOF) |
| 121 |
if (fflush(fp) == -1) |
| 122 |
error(SYSTEM, "error detected writing file in writep"); |
| 123 |
|
| 124 |
} |
| 125 |
|
| 126 |
#undef HI7 |
| 127 |
|
| 128 |
#undef LO7 |
| 129 |
|
| 130 |
|
| 131 |
void |
| 132 |
writeof( /* write end of file command to fp */ |
| 133 |
FILE *fp |
| 134 |
) |
| 135 |
{ |
| 136 |
writep(&peof, fp); |
| 137 |
} |
| 138 |
|
