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13e4760a16
The "clear to end of line" sequence is used to nicely output the progress indicator without leaving garbage on the terminal. However, this works only on ANSI capable terminals. We use the same check as in color.c to find out whether the terminal supports this feature and use a workaround (a few spaces in a row) if it does not. [jc: as an old fashoned git myself, and given the fact that the possible prefix and suffix are small number of short constant strings, I actually prefer a simpler-and-more-stupid approach. This is with Nico's clean-up.] Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at> Signed-off-by: Junio C Hamano <gitster@pobox.com>
129 lines
3 KiB
C
129 lines
3 KiB
C
#include "pkt-line.h"
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#include "sideband.h"
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/*
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* Receive multiplexed output stream over git native protocol.
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* in_stream is the input stream from the remote, which carries data
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* in pkt_line format with band designator. Demultiplex it into out
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* and err and return error appropriately. Band #1 carries the
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* primary payload. Things coming over band #2 is not necessarily
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* error; they are usually informative message on the standard error
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* stream, aka "verbose"). A message over band #3 is a signal that
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* the remote died unexpectedly. A flush() concludes the stream.
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*/
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#define PREFIX "remote:"
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#define ANSI_SUFFIX "\033[K"
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#define DUMB_SUFFIX " "
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#define FIX_SIZE 10 /* large enough for any of the above */
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int recv_sideband(const char *me, int in_stream, int out, int err)
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{
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unsigned pf = strlen(PREFIX);
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unsigned sf;
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char buf[LARGE_PACKET_MAX + 2*FIX_SIZE];
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char *suffix, *term;
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memcpy(buf, PREFIX, pf);
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term = getenv("TERM");
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if (term && strcmp(term, "dumb"))
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suffix = ANSI_SUFFIX;
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else
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suffix = DUMB_SUFFIX;
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sf = strlen(suffix);
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while (1) {
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int band, len;
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len = packet_read_line(in_stream, buf + pf, LARGE_PACKET_MAX);
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if (len == 0)
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break;
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if (len < 1) {
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len = sprintf(buf, "%s: protocol error: no band designator\n", me);
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safe_write(err, buf, len);
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return SIDEBAND_PROTOCOL_ERROR;
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}
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band = buf[pf] & 0xff;
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len--;
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switch (band) {
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case 3:
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buf[pf] = ' ';
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buf[pf+1+len] = '\n';
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safe_write(err, buf, pf+1+len+1);
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return SIDEBAND_REMOTE_ERROR;
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case 2:
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buf[pf] = ' ';
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len += pf+1;
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while (1) {
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int brk = pf+1;
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/* Break the buffer into separate lines. */
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while (brk < len) {
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brk++;
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if (buf[brk-1] == '\n' ||
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buf[brk-1] == '\r')
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break;
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}
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/*
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* Let's insert a suffix to clear the end
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* of the screen line, but only if current
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* line data actually contains something.
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*/
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if (brk > pf+1 + 1) {
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char save[FIX_SIZE];
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memcpy(save, buf + brk, sf);
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buf[brk + sf - 1] = buf[brk - 1];
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memcpy(buf + brk - 1, suffix, sf);
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safe_write(err, buf, brk + sf);
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memcpy(buf + brk, save, sf);
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} else
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safe_write(err, buf, brk);
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if (brk < len) {
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memmove(buf + pf+1, buf + brk, len - brk);
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len = len - brk + pf+1;
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} else
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break;
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}
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continue;
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case 1:
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safe_write(out, buf + pf+1, len);
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continue;
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default:
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len = sprintf(buf,
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"%s: protocol error: bad band #%d\n",
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me, band);
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safe_write(err, buf, len);
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return SIDEBAND_PROTOCOL_ERROR;
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}
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}
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return 0;
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}
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/*
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* fd is connected to the remote side; send the sideband data
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* over multiplexed packet stream.
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*/
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ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
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{
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ssize_t ssz = sz;
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const char *p = data;
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while (sz) {
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unsigned n;
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char hdr[5];
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n = sz;
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if (packet_max - 5 < n)
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n = packet_max - 5;
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sprintf(hdr, "%04x", n + 5);
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hdr[4] = band;
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safe_write(fd, hdr, 5);
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safe_write(fd, p, n);
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p += n;
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sz -= n;
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}
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return ssz;
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}
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