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tag: v1.5.4-rc4
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Octocat-spinner-32-eaf2f5

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#include "pkt-line.h"
#include "sideband.h"

/*
* Receive multiplexed output stream over git native protocol.
* in_stream is the input stream from the remote, which carries data
* in pkt_line format with band designator. Demultiplex it into out
* and err and return error appropriately. Band #1 carries the
* primary payload. Things coming over band #2 is not necessarily
* error; they are usually informative message on the standard error
* stream, aka "verbose"). A message over band #3 is a signal that
* the remote died unexpectedly. A flush() concludes the stream.
*/

#define PREFIX "remote:"

#define ANSI_SUFFIX "\033[K"
#define DUMB_SUFFIX " "

#define FIX_SIZE 10 /* large enough for any of the above */

int recv_sideband(const char *me, int in_stream, int out, int err)
{
unsigned pf = strlen(PREFIX);
unsigned sf;
char buf[LARGE_PACKET_MAX + 2*FIX_SIZE];
char *suffix, *term;

memcpy(buf, PREFIX, pf);
term = getenv("TERM");
if (term && strcmp(term, "dumb"))
suffix = ANSI_SUFFIX;
else
suffix = DUMB_SUFFIX;
sf = strlen(suffix);

while (1) {
int band, len;
len = packet_read_line(in_stream, buf + pf, LARGE_PACKET_MAX);
if (len == 0)
break;
if (len < 1) {
len = sprintf(buf, "%s: protocol error: no band designator\n", me);
safe_write(err, buf, len);
return SIDEBAND_PROTOCOL_ERROR;
}
band = buf[pf] & 0xff;
len--;
switch (band) {
case 3:
buf[pf] = ' ';
buf[pf+1+len] = '\n';
safe_write(err, buf, pf+1+len+1);
return SIDEBAND_REMOTE_ERROR;
case 2:
buf[pf] = ' ';
len += pf+1;
while (1) {
int brk = pf+1;

/* Break the buffer into separate lines. */
while (brk < len) {
brk++;
if (buf[brk-1] == '\n' ||
buf[brk-1] == '\r')
break;
}

/*
* Let's insert a suffix to clear the end
* of the screen line, but only if current
* line data actually contains something.
*/
if (brk > pf+1 + 1) {
char save[FIX_SIZE];
memcpy(save, buf + brk, sf);
buf[brk + sf - 1] = buf[brk - 1];
memcpy(buf + brk - 1, suffix, sf);
safe_write(err, buf, brk + sf);
memcpy(buf + brk, save, sf);
} else
safe_write(err, buf, brk);

if (brk < len) {
memmove(buf + pf+1, buf + brk, len - brk);
len = len - brk + pf+1;
} else
break;
}
continue;
case 1:
safe_write(out, buf + pf+1, len);
continue;
default:
len = sprintf(buf,
"%s: protocol error: bad band #%d\n",
me, band);
safe_write(err, buf, len);
return SIDEBAND_PROTOCOL_ERROR;
}
}
return 0;
}

/*
* fd is connected to the remote side; send the sideband data
* over multiplexed packet stream.
*/
ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
{
ssize_t ssz = sz;
const char *p = data;

while (sz) {
unsigned n;
char hdr[5];

n = sz;
if (packet_max - 5 < n)
n = packet_max - 5;
sprintf(hdr, "%04x", n + 5);
hdr[4] = band;
safe_write(fd, hdr, 5);
safe_write(fd, p, n);
p += n;
sz -= n;
}
return ssz;
}
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