blame.c: Properly initialize strbuf after calling, textconv_object()
[git/dscho.git] / trace.c
blob1e560cb0b977e19beeb095497c8e4f6280b7f0d6
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
5 * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
6 * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
7 * Copyright (C) 2006 Mike McCormack
8 * Copyright (C) 2006 Christian Couder
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include "cache.h"
26 #include "quote.h"
28 void do_nothing(size_t unused)
32 /* Get a trace file descriptor from GIT_TRACE env variable. */
33 static int get_trace_fd(int *need_close)
35 char *trace = getenv("GIT_TRACE");
37 if (!trace || !strcmp(trace, "") ||
38 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
39 return 0;
40 if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
41 return STDERR_FILENO;
42 if (strlen(trace) == 1 && isdigit(*trace))
43 return atoi(trace);
44 if (is_absolute_path(trace)) {
45 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
46 if (fd == -1) {
47 fprintf(stderr,
48 "Could not open '%s' for tracing: %s\n"
49 "Defaulting to tracing on stderr...\n",
50 trace, strerror(errno));
51 return STDERR_FILENO;
53 *need_close = 1;
54 return fd;
57 fprintf(stderr, "What does '%s' for GIT_TRACE mean?\n", trace);
58 fprintf(stderr, "If you want to trace into a file, "
59 "then please set GIT_TRACE to an absolute pathname "
60 "(starting with /).\n");
61 fprintf(stderr, "Defaulting to tracing on stderr...\n");
63 return STDERR_FILENO;
66 static const char err_msg[] = "Could not trace into fd given by "
67 "GIT_TRACE environment variable";
69 void trace_printf(const char *fmt, ...)
71 struct strbuf buf;
72 va_list ap;
73 int fd, len, need_close = 0;
75 fd = get_trace_fd(&need_close);
76 if (!fd)
77 return;
79 set_try_to_free_routine(do_nothing); /* is never reset */
80 strbuf_init(&buf, 64);
81 va_start(ap, fmt);
82 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
83 va_end(ap);
84 if (len >= strbuf_avail(&buf)) {
85 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
86 va_start(ap, fmt);
87 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
88 va_end(ap);
89 if (len >= strbuf_avail(&buf))
90 die("broken vsnprintf");
92 strbuf_setlen(&buf, len);
94 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
95 strbuf_release(&buf);
97 if (need_close)
98 close(fd);
101 void trace_argv_printf(const char **argv, const char *fmt, ...)
103 struct strbuf buf;
104 va_list ap;
105 int fd, len, need_close = 0;
107 fd = get_trace_fd(&need_close);
108 if (!fd)
109 return;
111 set_try_to_free_routine(do_nothing); /* is never reset */
112 strbuf_init(&buf, 64);
113 va_start(ap, fmt);
114 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
115 va_end(ap);
116 if (len >= strbuf_avail(&buf)) {
117 strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
118 va_start(ap, fmt);
119 len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
120 va_end(ap);
121 if (len >= strbuf_avail(&buf))
122 die("broken vsnprintf");
124 strbuf_setlen(&buf, len);
126 sq_quote_argv(&buf, argv, 0);
127 strbuf_addch(&buf, '\n');
128 write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
129 strbuf_release(&buf);
131 if (need_close)
132 close(fd);