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xd: accept -S for 8-byte swap

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R=rsc
https://codereview.appspot.com/7565045
This commit is contained in:
Russ Cox 2013-03-11 17:26:11 -04:00
parent 36bb28dc63
commit 01e3847b7e
2 changed files with 39 additions and 0 deletions
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3
man/man1/xd.1
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@ -75,6 +75,9 @@ Print file addresses in the given style (and size 4).
.B -s
Reverse (swab) the order of bytes in each group of 4 before printing.
.TP
.B -S
Reverse the order of bytes in each group of 8 before printing.
.TP
.B -r
Print repeating groups of identical 16-byte sequences as the first group
followed by an asterisk.

36
src/cmd/xd.c
View file

@ -8,6 +8,7 @@ int ndata;
unsigned long addr;
int repeats;
int swizzle;
int swizzle8;
int flush;
int abase=2;
int xd(char *, int);
@ -83,6 +84,12 @@ main(int argc, char *argv[])
goto Usage;
continue;
}
if(argv[0][0] == 'S'){
swizzle8 = 1;
if(argv[0][1])
goto Usage;
continue;
}
if(argv[0][0] == 'u'){
flush = 1;
if(argv[0][1])
@ -215,6 +222,8 @@ xd(char *name, int title)
data[i] = 0;
if(swizzle)
swizz();
if(swizzle8)
swizz8();
if(ndata==16 && repeats){
if(addr>0 && data[0]==odata[0]){
for(i=1; i<16; i++)
@ -276,6 +285,33 @@ swizz(void)
}
}
void
swizz8(void)
{
uchar *p, *q;
int i;
uchar swdata[16];
p = data;
q = swdata;
for(i=0; i<16; i++)
*q++ = *p++;
p = data;
q = swdata;
for(i=0; i<8; i++){
p[0] = q[7];
p[1] = q[6];
p[2] = q[5];
p[3] = q[4];
p[4] = q[3];
p[5] = q[2];
p[6] = q[1];
p[7] = q[0];
p += 8;
q += 8;
}
}
void
fmt0(char *f)
{