Full rework of quote_c_style and write_name_quoted.
[git/git.git] / trace.c
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1/*
2 * GIT - The information manager from hell
3 *
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
9 *
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.
14 *
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.
19 *
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
23 */
24
25#include "cache.h"
26#include "quote.h"
27
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28/* Get a trace file descriptor from GIT_TRACE env variable. */
29static int get_trace_fd(int *need_close)
30{
31 char *trace = getenv("GIT_TRACE");
32
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33 if (!trace || !strcmp(trace, "") ||
34 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
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35 return 0;
36 if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
37 return STDERR_FILENO;
38 if (strlen(trace) == 1 && isdigit(*trace))
39 return atoi(trace);
40 if (*trace == '/') {
41 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
42 if (fd == -1) {
43 fprintf(stderr,
44 "Could not open '%s' for tracing: %s\n"
45 "Defaulting to tracing on stderr...\n",
46 trace, strerror(errno));
47 return STDERR_FILENO;
48 }
49 *need_close = 1;
50 return fd;
51 }
52
53 fprintf(stderr, "What does '%s' for GIT_TRACE means ?\n", trace);
54 fprintf(stderr, "If you want to trace into a file, "
55 "then please set GIT_TRACE to an absolute pathname "
56 "(starting with /).\n");
57 fprintf(stderr, "Defaulting to tracing on stderr...\n");
58
59 return STDERR_FILENO;
60}
61
62static const char err_msg[] = "Could not trace into fd given by "
63 "GIT_TRACE environment variable";
64
19247e55 65void trace_printf(const char *fmt, ...)
6ce4e61f 66{
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67 char buf[8192];
68 va_list ap;
69 int fd, len, need_close = 0;
6ce4e61f 70
19247e55 71 fd = get_trace_fd(&need_close);
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72 if (!fd)
73 return;
74
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75 va_start(ap, fmt);
76 len = vsnprintf(buf, sizeof(buf), fmt, ap);
77 va_end(ap);
78 if (len >= sizeof(buf))
79 die("unreasonnable trace length");
80 write_or_whine_pipe(fd, buf, len, err_msg);
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81
82 if (need_close)
83 close(fd);
84}
85
19247e55 86void trace_argv_printf(const char **argv, int count, const char *fmt, ...)
6ce4e61f 87{
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88 char buf[8192];
89 va_list ap;
90 char *argv_str;
91 size_t argv_len;
92 int fd, len, need_close = 0;
6ce4e61f 93
19247e55 94 fd = get_trace_fd(&need_close);
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95 if (!fd)
96 return;
97
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98 va_start(ap, fmt);
99 len = vsnprintf(buf, sizeof(buf), fmt, ap);
100 va_end(ap);
101 if (len >= sizeof(buf))
102 die("unreasonnable trace length");
103
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104 /* Get the argv string. */
105 argv_str = sq_quote_argv(argv, count);
106 argv_len = strlen(argv_str);
107
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108 write_or_whine_pipe(fd, buf, len, err_msg);
109 write_or_whine_pipe(fd, argv_str, argv_len, err_msg);
110 write_or_whine_pipe(fd, "\n", 1, err_msg);
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111
112 free(argv_str);
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113
114 if (need_close)
115 close(fd);
116}