tfpformat.c - plan9port - [fork] Plan 9 from user space
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       ---
       tfpformat.c (1627B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bio.h>
            4 #include <mach.h>
            5 
            6 /*
            7  *        Format floating point registers
            8  *
            9  *        Register codes in format field:
           10  *        'X' - print as 32-bit hexadecimal value
           11  *        'F' - 64-bit double register when modif == 'F'; else 32-bit single reg
           12  *        'f' - 32-bit ieee float
           13  *        '8' - big endian 80-bit ieee extended float
           14  *        '3' - little endian 80-bit ieee extended float with hole in bytes 8&9
           15  */
           16 int
           17 fpformat(Map *map, Regdesc *rp, char *buf, uint n, uint modif)
           18 {
           19         char reg[12];
           20         u32int r;
           21 
           22         switch(rp->format)
           23         {
           24         case 'X':
           25                 if (get4(map, rp->offset, &r) < 0)
           26                         return -1;
           27                 snprint(buf, n, "%lux", r);
           28                 break;
           29         case 'F':        /* first reg of double reg pair */
           30                 if (modif == 'F')
           31                 if ((rp->format=='F') || (((rp+1)->flags&RFLT) && (rp+1)->format == 'f')) {
           32                         if (get1(map, rp->offset, (uchar *)reg, 8) < 0)
           33                                 return -1;
           34                         mach->ftoa64(buf, n, reg);
           35                         if (rp->format == 'F')
           36                                 return 1;
           37                         return 2;
           38                 }
           39                         /* treat it like 'f' */
           40                 if (get1(map, rp->offset, (uchar *)reg, 4) < 0)
           41                         return -1;
           42                 mach->ftoa32(buf, n, reg);
           43                 break;
           44         case 'f':        /* 32 bit float */
           45                 if (get1(map, rp->offset, (uchar *)reg, 4) < 0)
           46                         return -1;
           47                 mach->ftoa32(buf, n, reg);
           48                 break;
           49         case '3':        /* little endian ieee 80 with hole in bytes 8&9 */
           50                 if (get1(map, rp->offset, (uchar *)reg, 10) < 0)
           51                         return -1;
           52                 memmove(reg+10, reg+8, 2);        /* open hole */
           53                 memset(reg+8, 0, 2);                /* fill it */
           54                 leieeeftoa80(buf, n, reg);
           55                 break;
           56         case '8':        /* big-endian ieee 80 */
           57                 if (get1(map, rp->offset, (uchar *)reg, 10) < 0)
           58                         return -1;
           59                 beieeeftoa80(buf, n, reg);
           60                 break;
           61         default:        /* unknown */
           62                 break;
           63         }
           64         return 1;
           65 }