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tag: v1.6.0-rc2
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/*
* GIT - The information manager from hell
*
* Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
* Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
* Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
* Copyright (C) 2006 Mike McCormack
* Copyright (C) 2006 Christian Couder
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include "cache.h"
#include "quote.h"

/* Get a trace file descriptor from GIT_TRACE env variable. */
static int get_trace_fd(int *need_close)
{
char *trace = getenv("GIT_TRACE");

if (!trace || !strcmp(trace, "") ||
!strcmp(trace, "0") || !strcasecmp(trace, "false"))
return 0;
if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
return STDERR_FILENO;
if (strlen(trace) == 1 && isdigit(*trace))
return atoi(trace);
if (is_absolute_path(trace)) {
int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
if (fd == -1) {
fprintf(stderr,
"Could not open '%s' for tracing: %s\n"
"Defaulting to tracing on stderr...\n",
trace, strerror(errno));
return STDERR_FILENO;
}
*need_close = 1;
return fd;
}

fprintf(stderr, "What does '%s' for GIT_TRACE means ?\n", trace);
fprintf(stderr, "If you want to trace into a file, "
"then please set GIT_TRACE to an absolute pathname "
"(starting with /).\n");
fprintf(stderr, "Defaulting to tracing on stderr...\n");

return STDERR_FILENO;
}

static const char err_msg[] = "Could not trace into fd given by "
"GIT_TRACE environment variable";

void trace_printf(const char *fmt, ...)
{
struct strbuf buf;
va_list ap;
int fd, len, need_close = 0;

fd = get_trace_fd(&need_close);
if (!fd)
return;

strbuf_init(&buf, 64);
va_start(ap, fmt);
len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
va_end(ap);
if (len >= strbuf_avail(&buf)) {
strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
va_start(ap, fmt);
len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
va_end(ap);
if (len >= strbuf_avail(&buf))
die("broken vsnprintf");
}
strbuf_setlen(&buf, len);

write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
strbuf_release(&buf);

if (need_close)
close(fd);
}

void trace_argv_printf(const char **argv, const char *fmt, ...)
{
struct strbuf buf;
va_list ap;
int fd, len, need_close = 0;

fd = get_trace_fd(&need_close);
if (!fd)
return;

strbuf_init(&buf, 64);
va_start(ap, fmt);
len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
va_end(ap);
if (len >= strbuf_avail(&buf)) {
strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
va_start(ap, fmt);
len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
va_end(ap);
if (len >= strbuf_avail(&buf))
die("broken vsnprintf");
}
strbuf_setlen(&buf, len);

sq_quote_argv(&buf, argv, 0);
strbuf_addch(&buf, '\n');
write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
strbuf_release(&buf);

if (need_close)
close(fd);
}
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